use domain/workspace/mod.nu *
use platform/user/config.nu [get-active-workspace-details list-workspaces]
use tools/nickel/process.nu [ncl-eval, ncl-eval-soft, default-ncl-paths, comp-ncl-export]
use domain/workspace/state.nu [state-read state-write state-node-get state-node-set state-node-start state-node-finish state-node-delete state-node-reset log-trim]
use platform/clients/orchestrator.nu [orch-url, orch-submit-component, orch-wait-task, orch-health]
use orchestration/taskservs/run.nu [run_taskserv]
use platform/config/accessor.nu [get-taskservs-path]
use domain/utils/templates.nu [on_template_path run_from_template]
use primitives/io/service_check.nu [health-gate]
use primitives/io/logging.nu [is-debug-enabled is-debug-level]
use platform/integrations/context_assembler.nu [build-cabling-credentials-env]


# Cluster-observability slice extracted from components.nu (ADR-026 layer hygiene).
use cli/components.nu [cli-err comp-dag-summary]
use domain/cluster/access.nu [comp-kubectl-access comp-kubectl-ssh]
use platform/clients/ssh.nu [comp-server-ssh-info comp-ssh-run]
use domain/workspace/resolve.nu [comp-ws-path comp-ws-infra comp-state-server comp-resolve-ws-path]

# Structured compute capacity for a Hetzner server type code: parsed CPU and RAM
# for capacity math (cluster top, the placement simulator) plus a human label.
# Unknown codes yield zero capacity and the code itself as label, so callers can
# degrade gracefully instead of mis-reporting headroom.
export def comp-server-capacity [type_code: string]: nothing -> record {
    let tbl = {
        cax11: { cpu: 2,  mem_gb: 4,  arch: "ARM" },   cax21: { cpu: 4,  mem_gb: 8,  arch: "ARM" },
        cax31: { cpu: 8,  mem_gb: 16, arch: "ARM" },   cax41: { cpu: 16, mem_gb: 32, arch: "ARM" },
        cpx11: { cpu: 2,  mem_gb: 2,  arch: "AMD" },   cpx21: { cpu: 3,  mem_gb: 4,  arch: "AMD" },
        cpx31: { cpu: 4,  mem_gb: 8,  arch: "AMD" },   cpx41: { cpu: 8,  mem_gb: 16, arch: "AMD" },
        cpx51: { cpu: 16, mem_gb: 32, arch: "AMD" },
        cx22:  { cpu: 2,  mem_gb: 4,  arch: "Intel" }, cx32:  { cpu: 4,  mem_gb: 8,  arch: "Intel" },
        cx42:  { cpu: 8,  mem_gb: 16, arch: "Intel" }, cx52:  { cpu: 16, mem_gb: 32, arch: "Intel" },
    }
    let spec = ($tbl | get -o $type_code)
    if ($spec == null) {
        { type: $type_code, cpu: 0, cpu_millis: 0, mem_gb: 0, mem_bytes: 0, arch: "", label: $type_code }
    } else {
        {
            type:       $type_code,
            cpu:        $spec.cpu,
            cpu_millis: ($spec.cpu * 1000),
            mem_gb:     $spec.mem_gb,
            mem_bytes:  ($spec.mem_gb * 1024 * 1024 * 1024),
            arch:       $spec.arch,
            label:      $"($spec.cpu)CPU ($spec.mem_gb)GB ($spec.arch)",
        }
    }
}

# Translate Hetzner server type codes to a human-readable CPU/RAM/arch label.
def hetzner-type-label [type_code: string]: nothing -> string {
    (comp-server-capacity $type_code).label
}

def status-dot [status: string]: nothing -> string {
    match $status {
        "running"  => "●"
        "off"      => "○"
        "starting" => "◐"
        _          => "○"
    }
}

# Load server runtime + declared metadata for all servers in a workspace infra.
# Cache mode: .servers-state.json (status/public_ip/location) + settings.ncl (type/private_ip).
# Live mode: hcloud API directly.
# Returns record keyed by hostname.
export def comp-load-server-info [
    ws_root: string
    infra:   string
    --live
]: nothing -> record {
    let state_path = ($ws_root | path join "infra" $infra ".servers-state.json")
    let cache = if ($state_path | path exists) { open $state_path } else { {} }

    let declared = do -i {
        let raw = (comp-ncl-export $ws_root $"infra/($infra)/settings.ncl")
        $raw | get -o servers | default []
        | reduce --fold {} {|srv, acc|
            $acc | insert $srv.hostname {
                type:       ($srv.server_type? | default ""),
                private_ip: ($srv | get -o networking.private_ip | default ""),
                provider:   ($srv.provider? | default "hetzner"),
            }
        }
    } | default {}

    if $live {
        let res = (do { ^hcloud server list -o json } | complete)
        if $res.exit_code != 0 { return $declared }
        ($res.stdout | from json)
        | reduce --fold {} {|h, acc|
            let d = ($declared | get -o $h.name | default {})
            $acc | insert $h.name {
                status:     $h.status,
                type:       ($h | get -o server_type.name | default ($d.type? | default "")),
                location:   ($h | get -o datacenter.location.name | default ""),
                public_ip:  ($h | get -o public_net.ipv4.ip | default ""),
                private_ip: ($d.private_ip? | default ""),
                provider:   ($d.provider? | default "hetzner"),
            }
        }
    } else {
        $cache | items {|hostname entry|
            let d = ($declared | get -o $hostname | default {})
            {
                key: $hostname,
                value: {
                    status:     ($entry.status? | default ""),
                    type:       ($d.type? | default ""),
                    location:   ($entry.location? | default ""),
                    public_ip:  ($entry.public_ip? | default ""),
                    private_ip: ($d.private_ip? | default ""),
                    provider:   ($d.provider? | default "hetzner"),
                },
            }
        } | reduce --fold {} {|it, acc| $acc | insert $it.key $it.value}
    }
}

# One-line server info badge for the TASKSERV section header.
export def comp-server-badge [info: record]: nothing -> string {
    if ($info | is-empty) { return "" }
    let dot    = (status-dot ($info.status? | default ""))
    let status = ($info.status? | default "")
    let type_l = if ($info.type? | default "" | is-not-empty) {
        hetzner-type-label $info.type
    } else { "" }
    let loc    = ($info.location? | default "")
    let pub    = ($info.public_ip? | default "")
    let priv   = ($info.private_ip? | default "")
    let ip_str = if ($pub | is-not-empty) and ($priv | is-not-empty) {
        $"($pub) / ($priv)"
    } else if ($pub | is-not-empty) { $pub } else { $priv }
    let parts = [$"($dot) ($status)" $type_l $loc $ip_str] | where { $in | is-not-empty }
    if ($parts | is-empty) { "" } else { $parts | str join "  " }
}

def cluster-cache-path [ws_root: string, infra: string]: nothing -> string {
    $ws_root | path join "infra" $infra ".cluster-state.json"
}

# Read the declared k0s version from settings.ncl (settings.k0s.version).
export def comp-settings-k0s-version [ws_root: string, infra: string]: nothing -> string {
    let raw = (comp-ncl-export $ws_root $"infra/($infra)/settings.ncl")
    $raw | get -o settings | default {} | get -o k0s | default {} | get -o version | default ""
}

# Fetch cluster summary counts via the declared remote kubectl (single SSH call).
# Returns the same shape as comp-cluster-summary's result record. node/pod totals
# come from the caller's already-fetched k8s_data; this adds ns/dply/pvc counts.
def comp-kubectl-summary-counts [ws_root: string, infra: string, version: string, k8s_data: record]: nothing -> record {
    let nodes = ($k8s_data.nodes? | default [])
    let pods  = ($k8s_data.pods?  | default [])
    let nodes_total  = ($nodes | length)
    let nodes_ready  = ($nodes | where {|n|
        ($n | get -o status | default {} | get -o conditions | default []) | any { ($in.type? == "Ready") and ($in.status? == "True") }
    } | length)
    let pods_total   = ($pods | length)
    let pods_running = ($pods | where { ($in | get -o status | default {} | get -o phase | default "") == "Running" } | length)
    let cp_ip = ($nodes | get 0? | default {} | get -o status | default {} | get -o addresses | default [] | where { $in.type? == "InternalIP" } | get 0? | get -o address | default "")
    let r = (comp-kubectl-ssh $ws_root $infra "get namespaces,deployments,pvc -A --no-headers -o json")
    let counts = if $r.exit_code == 0 {
        let items = (try { $r.stdout | from json | get -o items | default [] } catch { [] })
        {
            ns:   ($items | where { ($in.kind? | default "") == "Namespace" } | length),
            dply: ($items | where { ($in.kind? | default "") == "Deployment" } | length),
            pvc:  ($items | where { (($in.kind? | default "") == "PersistentVolumeClaim") and (($in.status?.phase? | default "") == "Bound") } | length),
        }
    } else { { ns: 0, dply: 0, pvc: 0 } }
    {
        version:      $version,
        namespaces:   $counts.ns,
        deployments:  $counts.dply,
        pvcs_bound:   $counts.pvc,
        nodes_ready:  $nodes_ready,
        nodes_total:  $nodes_total,
        pods_running: $pods_running,
        pods_total:   $pods_total,
        cp_ip:        $cp_ip,
        last_sync:    (date now | format date "%Y-%m-%dT%H:%M:%SZ"),
    }
}

# Fetch (--live) or read cached cluster summary: version, ns/dply/pvc counts, node+pod status.
# Live: second lightweight SSH (counts only — separate from comp-ssh-k8s-data heavy JSON call).
# Cache: writes .cluster-state.json on live fetch; reads it on non-live call.
export def comp-cluster-summary [
    ws_root:     string
    infra:       string
    k8s_data:    record     # node/pod data already fetched by comp-ssh-k8s-data
    version:     string     # declared k0s/k8s version from settings — caller resolves via comp-settings-k0s-version
    --live
]: nothing -> record {
    let empty = {
        version: "", namespaces: 0, deployments: 0, pvcs_bound: 0, last_sync: "",
        nodes_ready: 0, nodes_total: 0, pods_running: 0, pods_total: 0, cp_ip: "",
    }
    if not $live {
        let cache = (cluster-cache-path $ws_root $infra)
        let base  = if ($cache | path exists) { open $cache } else { $empty }
        return ($base | merge { version: (if ($version | is-not-empty) { $version } else { $base.version? | default "" }) })
    }
    # Live: counts come from the declared remote kubectl (SSH to control-plane).
    # provisioning never runs kubectl locally — see comp-kubectl-access.
    let result = (comp-kubectl-summary-counts $ws_root $infra $version $k8s_data)
    $result | to json | save -f (cluster-cache-path $ws_root $infra)
    $result
}

# One-line cluster summary badge for the CLUSTER COMPONENTS header.
export def comp-cluster-badge [summary: record]: nothing -> string {
    if ($summary | is-empty) { return "" }
    let ver  = ($summary.version?   | default "")
    let ns   = ($summary.namespaces?  | default 0)
    let pods = ($summary.pods_total?  | default 0)
    if ($ver | is-empty) and $ns == 0 and $pods == 0 { return "" }
    let cp_str    = if ($summary.cp_ip?    | default "" | is-not-empty) { $"CP: ($summary.cp_ip)"                          } else { "" }
    let ver_str   = if ($ver | is-not-empty)                            { $ver                                              } else { "" }
    let nodes_str = if ($summary.nodes_total? | default 0) > 0         { $"($summary.nodes_ready)/($summary.nodes_total) nodes" } else { "" }
    let pods_str  = if ($summary.pods_total?  | default 0) > 0         { $"($summary.pods_running)/($summary.pods_total) pods"  } else { "" }
    let ns_str    = if $ns  > 0 { $"($ns) ns"                       } else { "" }
    let dply_str  = if ($summary.deployments? | default 0) > 0 { $"($summary.deployments) dply" } else { "" }
    let pvcs_str  = if ($summary.pvcs_bound?  | default 0) > 0 { $"($summary.pvcs_bound) pvcs"  } else { "" }
    [$cp_str $ver_str $nodes_str $pods_str $ns_str $dply_str $pvcs_str] | where { $in | is-not-empty } | str join "  "
}

# Parse a Kubernetes resource quantity (e.g. "529Mi", "1Gi", "1024Ki", "2G") to
# bytes for numeric sorting and capacity math. Unparseable input yields 0.
def k8s-quantity-bytes [q: string]: nothing -> int {
    let s = ($q | str trim)
    if ($s | is-empty) { return 0 }
    let m = ($s | parse --regex '(?<num>[0-9.]+)(?<unit>[A-Za-z]*)' | get 0?)
    if ($m == null) { return 0 }
    let num  = ($m.num | into float)
    let mult = (match $m.unit {
        "Ki" => 1024.0, "Mi" => 1048576.0, "Gi" => 1073741824.0, "Ti" => 1099511627776.0,
        "k" | "K" => 1000.0, "M" => 1000000.0, "G" => 1000000000.0, "T" => 1000000000000.0,
        _ => 1.0,
    })
    (($num * $mult) | math round | into int)
}

# Operator-relevant node labels: drop the well-known system/cloud domains so only
# placement-meaningful labels (node_class, can_use_fip.*, custom) remain. Returns
# a "k=v k=v" string (valueless labels shown as bare keys).
def node-operator-labels [labels: record]: nothing -> string {
    let system = ["kubernetes.io", "k8s.io", "hetzner.cloud", "topology.", "beta.", "csi."]
    $labels | transpose key value
    | where {|r| not ($system | any {|p| $r.key | str contains $p }) }
    | each {|r|
        # Boolean labels (value "true") and valueless labels show as the bare key —
        # if it's present it's set. Non-boolean labels keep key=value.
        if (($r.value | default "" | is-empty) or ($r.value == "true")) { $r.key } else { $"($r.key)=($r.value)" }
    }
    | str join " "
}

# Live per-node resource usage via `kubectl top`, enriched with the declared
# Hetzner server type and its nominal capacity. provisioning never runs kubectl
# locally — metrics arrive over the bounded remote-kubectl SSH path
# (comp-kubectl-ssh). kubectl's own percentages are relative to node *allocatable*
# (physical RAM minus kernel/kube reservations), which is why the nominal column
# differs from what the % implies. --pods appends the heaviest pods by memory.
export def "main cluster top" [
    mode?: string = ""               # "pods" appends the heaviest pods by memory
    --workspace (-w): string = ""
    --infra (-i): string = ""
    --limit (-l): int = 15
    --out (-o): string = ""          # json | yaml | table (default terminal view)
]: nothing -> any {
    let pods = ($mode in ["pods", "p"])
    let ws_root = (comp-ws-path $workspace)
    if ($ws_root | is-empty) { cli-err "no workspace resolved" }
    let infra_name = if ($infra | is-not-empty) { $infra } else { comp-ws-infra $ws_root }
    if ($infra_name | is-empty) { cli-err $"no infra found under ($ws_root)/infra" }

    let nodes_res = (comp-kubectl-ssh $ws_root $infra_name "top nodes --no-headers")
    if $nodes_res.exit_code != 0 {
        cli-err $"kubectl top nodes failed \(metrics-server reachable?\): ($nodes_res.stderr | str trim)"
    }
    let servers = (comp-load-server-info $ws_root $infra_name)

    # Per-node requested/limited memory vs allocatable — the bin-packing signal
    # kubectl top omits (top reports live usage, not scheduler reservations).
    # Sourced from pod specs via one SSH JSON fetch; pods in a terminal phase are
    # excluded to match kubectl's "Allocated resources". no-req counts containers
    # with no memory request (invisible weight that defeats the scheduler).
    let access = (comp-kubectl-access $ws_root $infra_name)
    let k8s    = (comp-ssh-k8s-data $ws_root $infra_name $access.host)
    let alloc  = ($k8s.nodes | reduce --fold {} {|n, acc|
        $acc | insert ($n.metadata.name) (k8s-quantity-bytes ($n.status?.allocatable?.memory? | default "0"))
    })
    let labelmap = ($k8s.nodes | reduce --fold {} {|n, acc|
        $acc | insert ($n.metadata.name) (node-operator-labels ($n.metadata?.labels? | default {}))
    })
    let agg = ($k8s.pods
        | where { (($in.status?.phase? | default "") not-in ["Succeeded", "Failed"]) and (($in.spec?.nodeName? | default "") | is-not-empty) }
        | reduce --fold {} {|p, acc|
            let node = ($p.spec.nodeName)
            let cts  = ($p.spec?.containers? | default [])
            let req  = ($cts | reduce --fold 0 {|c, s| $s + (k8s-quantity-bytes ($c.resources?.requests?.memory? | default "0")) })
            let lim  = ($cts | reduce --fold 0 {|c, s| $s + (k8s-quantity-bytes ($c.resources?.limits?.memory? | default "0")) })
            let nor  = ($cts | where { ($in.resources?.requests?.memory? | default "" | is-empty) } | length)
            let cur  = ($acc | get -o $node | default { req: 0, lim: 0, noreq: 0 })
            $acc | upsert $node { req: ($cur.req + $req), lim: ($cur.lim + $lim), noreq: ($cur.noreq + $nor) }
        })

    let node_rows = ($nodes_res.stdout | str replace --all "\r" "" | lines
        | where { ($in | str trim | is-not-empty) }
        | each {|ln|
            let c    = ($ln | str trim | split row --regex '\s+')
            let name = ($c | get 0? | default "")
            let type = ($servers | get -o $name | default {} | get -o type | default "")
            let cap  = (comp-server-capacity $type)
            let a    = ($alloc | get -o $name | default 0)
            let g    = ($agg | get -o $name | default { req: 0, lim: 0, noreq: 0 })
            {
                node:     $name,
                type:     (if ($type | is-not-empty) { $type } else { "—" }),
                nominal:  (if $cap.mem_gb > 0 { $"($cap.cpu)c/($cap.mem_gb)Gi" } else { "—" }),
                cpu:      ($c | get 1? | default ""),
                "cpu%":   ($c | get 2? | default ""),
                mem:      ($c | get 3? | default ""),
                "mem%":   ($c | get 4? | default ""),
                "req%":   (if $a > 0 { $"(($g.req * 100 / $a) | math round)%" } else { "—" }),
                "lim%":   (if $a > 0 { $"(($g.lim * 100 / $a) | math round)%" } else { "—" }),
                "no-req": $g.noreq,
                labels:   ($labelmap | get -o $name | default ""),
            }
        })

    let pod_rows = if $pods {
        let pods_res = (comp-kubectl-ssh $ws_root $infra_name "top pods --all-namespaces --no-headers")
        if $pods_res.exit_code != 0 {
            print --stderr $"kubectl top pods failed: ($pods_res.stderr | str trim)"
            []
        } else {
            $pods_res.stdout | str replace --all "\r" "" | lines
            | where { ($in | str trim | is-not-empty) }
            | each {|ln|
                let c = ($ln | str trim | split row --regex '\s+')
                {
                    namespace: ($c | get 0? | default ""),
                    pod:       ($c | get 1? | default ""),
                    cpu:       ($c | get 2? | default ""),
                    mem:       ($c | get 3? | default ""),
                    mem_bytes: (k8s-quantity-bytes ($c | get 3? | default "0")),
                }
            }
            | sort-by mem_bytes --reverse
            | first $limit
            | reject mem_bytes
        }
    } else { [] }

    let data = if $pods { { nodes: $node_rows, pods: $pod_rows } } else { $node_rows }
    match ($out | str downcase) {
        "json" => ($data | to json)
        "yaml" | "yml" => ($data | to yaml)
        "" | "table" => {
            if $pods {
                print "NODES"
                print ($node_rows | table)
                cluster-top-legend
                print ""
                print $"TOP ($limit) PODS BY MEMORY"
                $pod_rows
            } else {
                print ($node_rows | table)
                cluster-top-legend
                null
            }
        }
        _ => { cli-err $"unknown --out format: ($out) \(use json|yaml|table\)" }
    }
}

# Interpretive legend for `cluster top` columns — printed under the node table so
# the numbers can be read without external context. Suppressed in json/yaml output.
def cluster-top-legend []: nothing -> nothing {
    print ""
    print "How to read it:"
    print "  nominal   physical CPU/RAM of the Hetzner type (cax11=2c/4Gi, cax21=4c/8Gi)."
    print "  cpu /mem  LIVE usage now (kubectl top). mem% is vs ALLOCATABLE (RAM minus"
    print "            kernel+kube reservations), so it reads higher than vs nominal."
    print "  req%      sum of pod memory REQUESTS vs allocatable = what the scheduler"
    print "            reserved. Healthy < 80%; it is the real 'fullness' for placement."
    print "  lim%      sum of pod memory LIMITS vs allocatable = overcommit. > 100% means"
    print "            pods may collectively exceed RAM → OOM-kill risk under pressure."
    print "  no-req    containers with NO memory request — invisible to the scheduler,"
    print "            cause blind bin-packing and are first to be OOM-killed."
    print "  labels    operator node labels (node_class, can_use_fip.*, custom) that drive"
    print "            placement; system/cloud domains (kubernetes.io, hetzner.cloud) hidden."
}

# Reconcile declared operator node labels onto the live Kubernetes nodes. Source
# of truth: servers.ncl node_labels (record) + node_class (list, projected as
# node-class.<class>=true). Closes the drift where declared labels never reach the
# nodes (no kubectl label runs at join time). Dry-run by default: prints the plan;
# --apply runs `kubectl label node ... --overwrite` over the bounded SSH path.
export def "main cluster label-nodes" [
    --workspace (-w): string = ""
    --infra (-i): string = ""
    --apply (-a)
]: nothing -> any {
    let ws_root = (comp-ws-path $workspace)
    if ($ws_root | is-empty) { cli-err "no workspace resolved" }
    let infra_name = if ($infra | is-not-empty) { $infra } else { comp-ws-infra $ws_root }
    if ($infra_name | is-empty) { cli-err $"no infra found under ($ws_root)/infra" }

    let settings = (comp-ncl-export $ws_root $"infra/($infra_name)/settings.ncl")
    let servers  = ($settings | get -o servers | default []
        | where { ($in.not_use? | default false) == false })

    # Desired operator labels per node: node_labels record + node_class projection.
    let desired = ($servers | reduce --fold {} {|s, acc|
        let base = ($s.node_labels? | default {})
        let cls  = ($s.node_class? | default [] | reduce --fold {} {|c, m| $m | insert $"node-class.($c)" "true" })
        $acc | insert ($s.hostname) ($base | merge $cls)
    })

    let access = (comp-kubectl-access $ws_root $infra_name)
    let k8s    = (comp-ssh-k8s-data $ws_root $infra_name $access.host)
    let live   = ($k8s.nodes | reduce --fold {} {|n, acc|
        $acc | insert ($n.metadata.name) ($n.metadata?.labels? | default {})
    })

    # Diff via transpose (label keys carry dots/slashes — unsafe for cell-path get).
    let plan = ($desired | transpose host want | each {|e|
        let have = (($live | get -o $e.host | default {}) | transpose key value)
        $e.want | transpose key value | each {|w|
            let m = ($have | where key == $w.key)
            let cur = if ($m | is-empty) { null } else { ($m | first | get value) }
            if $cur != $w.value {
                { node: $e.host, label: $w.key, current: ($cur | default "—"), desired: $w.value }
            } else { null }
        } | compact
    } | flatten)

    if ($plan | is-empty) {
        print "All declared node labels already applied — nothing to do."
        return []
    }
    if not $apply {
        print $"Planned label changes \(($plan | length)\) — dry-run, use --apply to apply:"
        return $plan
    }
    $plan | each {|c|
        let r = (comp-kubectl-ssh $ws_root $infra_name $"label node ($c.node) ($c.label)=($c.desired) --overwrite")
        { node: $c.node, label: $c.label, desired: $c.desired, status: (if $r.exit_code == 0 { "applied" } else { ($r.stderr | str trim) }) }
    }
}

# Placement simulator: project the per-node impact of (re)deploying a service.
# Reads the candidate's declared resources_effective (memory request) + placement
# from settings, the live node snapshot (allocatable, current pod requests, live
# usage) via the bounded SSH path, then computes projected requests% and
# working-set% per eligible node (eligibility = node-class label ∩ placement.node_class).
# Answers "does the next deploy fit, and where?" — the dry-run the ops loop lacked.
export def "main cluster plan" [
    service: string
    --workspace (-w): string = ""
    --infra (-i): string = ""
    --out (-o): string = ""
    --req-threshold: int = 80        # % allocatable requests treated as "full"
    --use-threshold: int = 90        # % allocatable working-set treated as risky
]: nothing -> any {
    let ws_root = (comp-ws-path $workspace)
    if ($ws_root | is-empty) { cli-err "no workspace resolved" }
    let infra_name = if ($infra | is-not-empty) { $infra } else { comp-ws-infra $ws_root }
    if ($infra_name | is-empty) { cli-err $"no infra found under ($ws_root)/infra" }

    # Candidate spec from declared NCL (settings.components.<key>).
    let settings = (comp-ncl-export $ws_root $"infra/($infra_name)/settings.ncl")
    let comps = ($settings | get -o components | default {})
    let key = if (($comps | get -o $service) != null) { $service } else { ($service | str replace --all "-" "_") }
    let comp = ($comps | get -o $key | default null)
    if ($comp == null) { cli-err $"component '($service)' not found in settings.components" }
    let re = ($comp | get -o resources_effective | default {})
    if ($re | is-empty) { cli-err $"component '($service)' has no resources_effective — declare class/resources first \(step 2c\)" }
    let cand_req = (k8s-quantity-bytes ($re | get -o memory | default {} | get -o request | default "0"))
    let cand_lim = (k8s-quantity-bytes ($re | get -o memory | default {} | get -o limit | default "0"))
    let want_nc  = ($comp | get -o placement | default {} | get -o node_class | default [] | each {|c| $c | into string})
    let svc_class = ($comp | get -o class | default "")

    let access = (comp-kubectl-access $ws_root $infra_name)
    let k8s    = (comp-ssh-k8s-data $ws_root $infra_name $access.host)
    if ($k8s.nodes | is-empty) { cli-err $"could not fetch live nodes \(CP: ($access.host | default 'unresolved'))" }
    let top    = (comp-kubectl-ssh $ws_root $infra_name "top nodes --no-headers")
    let usage  = if $top.exit_code == 0 {
        $top.stdout | str replace --all "\r" "" | lines | where { ($in | str trim | is-not-empty) }
        | reduce --fold {} {|ln, acc|
            let c = ($ln | str trim | split row --regex '\s+')
            $acc | insert ($c | get 0? | default "") (k8s-quantity-bytes ($c | get 3? | default "0"))
        }
    } else { {} }

    let live_pods = ($k8s.pods | where { (($in.status?.phase? | default "") not-in ["Succeeded", "Failed"]) and (($in.spec?.nodeName? | default "") | is-not-empty) })
    let rows = ($k8s.nodes | each {|n|
        let name  = ($n.metadata.name)
        let alloc = (k8s-quantity-bytes ($n.status?.allocatable?.memory? | default "0"))
        let labels = ($n.metadata?.labels? | default {} | transpose k v
            | where {|r| $r.k | str starts-with "node-class." } | each {|r| $r.k | str replace "node-class." "" })
        let eligible = if ($want_nc | is-empty) { true } else { ($want_nc | any {|c| $c in $labels }) }
        let cur_req = ($live_pods | where { ($in.spec.nodeName) == $name }
            | reduce --fold 0 {|p, s| $s + ($p.spec?.containers? | default [] | reduce --fold 0 {|c, s2| $s2 + (k8s-quantity-bytes ($c.resources?.requests?.memory? | default "0")) }) })
        let cur_use = ($usage | get -o $name | default 0)
        let proj_req = ($cur_req + $cand_req)
        let proj_use = ($cur_use + $cand_req)
        let req_pct  = (if $alloc > 0 { ($proj_req * 100 / $alloc) | math round } else { 0 })
        let use_pct  = (if $alloc > 0 { ($proj_use * 100 / $alloc) | math round } else { 0 })
        {
            node:      $name,
            eligible:  $eligible,
            "req now": (if $alloc > 0 { $"(($cur_req * 100 / $alloc) | math round)%" } else { "—" }),
            "req→":    (if $alloc > 0 { $"($req_pct)%" } else { "—" }),
            "ws→":     (if $alloc > 0 { $"($use_pct)%" } else { "—" }),
            fits:      ($eligible and ($req_pct <= $req_threshold) and ($use_pct <= $use_threshold)),
            _req_pct:  $req_pct,
        }
    })

    let eligible_fit = ($rows | where {|r| $r.eligible and $r.fits } | sort-by _req_pct)
    let best = ($eligible_fit | get 0? | get -o node | default "")
    let mem_h = ($re | get -o memory | default {})
    let summary = {
        service: $key, class: $svc_class,
        request: ($mem_h | get -o request | default "?"), limit: ($mem_h | get -o limit | default "?"),
        node_class: ($want_nc | str join ","),
        recommendation: (if ($best | is-not-empty) {
            $"schedules on ($best) \(lowest projected requests among eligible nodes that fit\)"
        } else {
            "NO eligible node fits within thresholds — activate another worker (wrk-1) or resize a node"
        }),
    }

    let out_rows = ($rows | reject _req_pct)
    match ($out | str downcase) {
        "json" => ({ summary: $summary, nodes: $out_rows } | to json)
        "yaml" | "yml" => ({ summary: $summary, nodes: $out_rows } | to yaml)
        _ => {
            print $"plan: ($key)  class=($svc_class)  mem req/lim=($summary.request)/($summary.limit)  prefers node-class=($summary.node_class)"
            print ($out_rows | table)
            print $"→ ($summary.recommendation)"
            null
        }
    }
}

# Format a byte count as a compact Gi/Mi string.
def fmt-gib [b: int]: nothing -> string {
    if $b >= 1073741824 { $"(($b / 1073741824 * 10 | math round) / 10)Gi" } else { $"(($b / 1048576) | math round)Mi" }
}

# Cluster capacity analysis: per-node working-set broken down by category
# (movable = general app classes, pinned = datastore/storage_engine, infra =
# kube-system/longhorn/cilium/daemonsets), plus an aggregate capacity check by
# node-class with what-if projections. Answers "horizontal vs vertical": movable
# load dominating storage nodes → add a general worker; pinned dominating → resize.
export def "main cluster capacity" [
    --workspace (-w): string = ""
    --infra (-i): string = ""
    --out (-o): string = ""
    --add-worker                     # what-if: add one cax11 general worker (~3.4Gi alloc)
    --resize: string = ""            # what-if: resize <node> cax11→cax21 (+4Gi alloc)
]: nothing -> any {
    let ws_root = (comp-ws-path $workspace)
    if ($ws_root | is-empty) { cli-err "no workspace resolved" }
    let infra_name = if ($infra | is-not-empty) { $infra } else { comp-ws-infra $ws_root }
    if ($infra_name | is-empty) { cli-err $"no infra found under ($ws_root)/infra" }

    let settings = (comp-ncl-export $ws_root $"infra/($infra_name)/settings.ncl")
    let comps = ($settings | get -o components | default {})
    # pod-name-prefix → pinned?  (component name with _→- is the usual pod prefix)
    let prefixes = ($comps | items {|k v|
        { prefix: ($k | str replace --all "_" "-"), pinned: (($v.class? | default "") in ["datastore", "storage_engine"]) }
    } | sort-by {|c| $c.prefix | str length } --reverse)
    let infra_ns = ["kube-system", "longhorn-system", "cilium", "cert-manager"]

    let access = (comp-kubectl-access $ws_root $infra_name)
    let k8s    = (comp-ssh-k8s-data $ws_root $infra_name $access.host)
    if ($k8s.nodes | is-empty) { cli-err $"could not fetch live nodes \(CP: ($access.host | default 'unresolved'))" }
    let top = (comp-kubectl-ssh $ws_root $infra_name "top pods --all-namespaces --no-headers")
    let usage = if $top.exit_code == 0 {
        $top.stdout | str replace --all "\r" "" | lines | where { ($in | str trim | is-not-empty) }
        | reduce --fold {} {|ln, acc|
            let c = ($ln | str trim | split row --regex '\s+')
            $acc | insert $"($c | get 0? | default '')/($c | get 1? | default '')" (k8s-quantity-bytes ($c | get 3? | default "0"))
        }
    } else { {} }

    let live = ($k8s.pods | where { (($in.status?.phase? | default "") not-in ["Succeeded", "Failed"]) and (($in.spec?.nodeName? | default "") | is-not-empty) })
    let per_node = ($k8s.nodes | each {|n|
        let name  = ($n.metadata.name)
        let alloc = (k8s-quantity-bytes ($n.status?.allocatable?.memory? | default "0"))
        let labels = ($n.metadata?.labels? | default {} | transpose k v
            | where {|r| $r.k | str starts-with "node-class." } | each {|r| $r.k | str replace "node-class." "" })
        let pods = ($live | where { ($in.spec.nodeName) == $name })
        let cats = ($pods | reduce --fold { movable: 0, pinned: 0, infra: 0 } {|p, acc|
            let ns = ($p.metadata.namespace)
            let pn = ($p.metadata.name)
            let use = ($usage | get -o $"($ns)/($pn)" | default 0)
            let cat = if ($ns in $infra_ns) { "infra" } else {
                let m = ($prefixes | where {|c| $pn | str starts-with $c.prefix } | get 0? | default null)
                if ($m == null) { "movable" } else if $m.pinned { "pinned" } else { "movable" }
            }
            $acc | upsert $cat (($acc | get $cat) + $use)
        })
        { node: $name, class: ($labels | str join ","), alloc: $alloc } | merge $cats
    })

    # Aggregate by node-class.
    let general_alloc = ($per_node | where {|r| "general" in ($r.class | split row ",")} | reduce --fold 0 {|r, s| $s + $r.alloc})
    let storage_alloc = ($per_node | where {|r| "storage" in ($r.class | split row ",")} | reduce --fold 0 {|r, s| $s + $r.alloc})
    let movable_total = ($per_node | reduce --fold 0 {|r, s| $s + $r.movable})
    let pinned_total  = ($per_node | reduce --fold 0 {|r, s| $s + $r.pinned})

    let cax11_alloc = 3650722201   # ~3.4Gi typical allocatable on a fresh cax11
    let resize_node = ($per_node | where node == $resize | get 0? | default null)
    let resize_is_general = (if ($resize_node != null) { "general" in ($resize_node.class | split row ",") } else { false })
    let resize_is_storage = (if ($resize_node != null) { "storage" in ($resize_node.class | split row ",") } else { false })
    let gen_alloc_wi = ($general_alloc
        + (if $add_worker { $cax11_alloc } else { 0 })
        + (if $resize_is_general { 4294967296 } else { 0 }))
    let stg_alloc_wi = ($storage_alloc + (if $resize_is_storage { 4294967296 } else { 0 }))

    let gen_util_now = (if $general_alloc > 0 { ($movable_total * 100 / $general_alloc | math round) } else { 0 })
    let gen_util_wi  = (if $gen_alloc_wi  > 0 { ($movable_total * 100 / $gen_alloc_wi  | math round) } else { 0 })

    let scenario = if $add_worker { "+1 general worker (cax11)" } else if ($resize | is-not-empty) { $"resize ($resize) → cax21" } else { "current" }
    let mv_s = (fmt-gib $movable_total)
    let pn_s = (fmt-gib $pinned_total)
    let recommendation = if ($movable_total > $pinned_total) {
        $"movable load ($mv_s) dominates pinned ($pn_s) — HORIZONTAL: add a general worker to relieve the storage nodes; vertical resize would keep apps mislocated"
    } else {
        $"pinned/datastore load ($pn_s) dominates movable ($mv_s) — VERTICAL: resize the pressured storage node rather than adding a general worker"
    }

    let rows = ($per_node | each {|r|
        {
            node: $r.node, class: $r.class, alloc: (fmt-gib $r.alloc),
            movable: (fmt-gib $r.movable), pinned: (fmt-gib $r.pinned), infra: (fmt-gib $r.infra),
        }
    })
    let summary = {
        movable_total: (fmt-gib $movable_total), pinned_total: (fmt-gib $pinned_total),
        general_alloc: (fmt-gib $general_alloc), storage_alloc: (fmt-gib $storage_alloc),
        general_util_now: $"($gen_util_now)%",
        scenario: $scenario,
        general_util_scenario: $"($gen_util_wi)%",
        recommendation: $recommendation,
    }

    match ($out | str downcase) {
        "json" => ({ nodes: $rows, summary: $summary } | to json)
        "yaml" | "yml" => ({ nodes: $rows, summary: $summary } | to yaml)
        _ => {
            print "PER-NODE working-set by category (movable=general apps · pinned=datastore · infra=k8s/longhorn)"
            print ($rows | table)
            print ""
            print $"movable total: ($summary.movable_total)   pinned total: ($summary.pinned_total)"
            print $"general node-class alloc: ($summary.general_alloc)   storage: ($summary.storage_alloc)"
            print $"general utilization \(movable/general-alloc\): now ($summary.general_util_now)  →  scenario [($scenario)] ($summary.general_util_scenario)"
            print $"→ ($recommendation)"
            null
        }
    }
}

# List all Kubernetes services via SSH to the cluster control plane.
# Matches CLI output of `kubectl get svc --all-namespaces`.
export def "main cluster services" [
    --workspace (-w): string = ""
    --infra (-i): string = ""
    --namespace (-n): string = ""     # filter to single namespace (default: all)
    --out (-o): string = ""           # json | yaml | table (default terminal view)
]: nothing -> any {
    let ws_root = (comp-ws-path $workspace)
    if ($ws_root | is-empty) { cli-err "no workspace resolved" }
    let infra_name = if ($infra | is-not-empty) { $infra } else { comp-ws-infra $ws_root }
    if ($infra_name | is-empty) { cli-err $"no infra found under ($ws_root)/infra" }

    let ns_flag = if ($namespace | is-not-empty) { $"-n ($namespace)" } else { "--all-namespaces" }
    let r = (comp-kubectl-ssh $ws_root $infra_name $"get svc ($ns_flag) -o json")
    if $r.exit_code != 0 {
        cli-err $"kubectl get svc failed: ($r.stderr | str trim)"
    }

    let items = (try { $r.stdout | from json | get -o items | default [] } catch { [] })
    let rows = ($items | each {|svc|
        let ns       = ($svc.metadata.namespace? | default "")
        let name     = ($svc.metadata.name? | default "")
        let svc_type = ($svc.spec.type? | default "ClusterIP")
        let cip      = ($svc.spec.clusterIP? | default "")
        let ext_ips  = ($svc.status.loadBalancer?.ingress? | default []
            | each {|ing| $ing.ip? | default ($ing.hostname? | default "") }
            | where { $in | is-not-empty } | str join ",")
        let ports    = ($svc.spec.ports? | default []
            | each {|p| $"($p.port?):($p.protocol? | default 'TCP')" } | str join " ")
        let has_https = ($svc.spec.ports? | default [] | any {|p|
            ($p.port? | default 0) == 443 or (($p.name? | default "") | str downcase | str contains "https")
        })
        { namespace: $ns, name: $name, type: $svc_type, cluster_ip: $cip, external_ips: $ext_ips, ports: $ports, https: $has_https }
    })

    match $out {
        "json"  => { $rows | to json }
        "yaml"  => { $rows | to yaml }
        _       => { $rows }
    }
}

# Oldest last_sync across .servers-state.json and .cluster-state.json (= most stale data shown).
export def comp-cache-last-sync [ws_root: string, infra: string]: nothing -> string {
    let srv_ts = do {
        let p = ($ws_root | path join "infra" $infra ".servers-state.json")
        if ($p | path exists) {
            open $p | values | each { $in.last_sync? | default "" } | where { $in | is-not-empty }
        } else { [] }
    }
    let cl_ts = do {
        let p = (cluster-cache-path $ws_root $infra)
        if ($p | path exists) {
            let v = ((open $p).last_sync? | default "")
            if ($v | is-not-empty) { [$v] } else { [] }
        } else { [] }
    }
    let all = ($srv_ts | append $cl_ts) | where { $in | is-not-empty }
    if ($all | is-empty) { "" } else { $all | sort | first }
}

# Single SSH session to CP: fetch pods + nodes as JSON in one connection.
# Returns {pods: list<record>, nodes: list<record>} — parsed from kubectl -o json output.
# Pods have metadata.namespace/name and status.phase/containerStatuses fields.
# Nodes have metadata.name and status.conditions fields.
export def comp-ssh-k8s-data [
    ws_root:  string,
    infra:    string,
    server:   string,
    --systemd-services: list<string> = [],  # service names to check via systemctl is-active
]: nothing -> record {
    let empty = { pods: [], nodes: [], systemd: {} }
    if ($server | is-empty) {
        print --stderr "[live] no server resolved — cannot fetch k8s data"
        return $empty
    }
    let info = (comp-server-ssh-info $ws_root $infra $server)
    if (is-debug-level 2) {
        let key_part = if ($info.key | is-not-empty) { $" -i ($info.key)" } else { "" }
        print --stderr $"[live] ssh($key_part) ($info.user)@($info.host) kubectl get pods+nodes -o json"
    }
    # PATH: SSH non-interactive sessions may not have /usr/local/bin (where k0s and kubeadm kubectl live).
    # KUBECONFIG: kubeadm clusters set this in ~/.bashrc (not sourced in BatchMode SSH).
    # Probe /root/.kube/config then /etc/kubernetes/admin.conf; k0s kubectl ignores KUBECONFIG entirely.
    let systemd_snippet = if ($systemd_services | is-not-empty) {
        let checks = ($systemd_services | each {|svc| $"printf '($svc):'; systemctl is-active ($svc) 2>/dev/null || true"} | str join "; ")
        $"echo '===SYSTEMD==='; ($checks)"
    } else { "" }
    let cmd_base = "export PATH=/usr/local/bin:/usr/bin:/bin:$PATH; for _kc in /root/.kube/config /etc/kubernetes/admin.conf; do [ -f \"$_kc\" ] && { export KUBECONFIG=\"$_kc\"; break; }; done; kc() { if command -v kubectl >/dev/null 2>&1; then kubectl \"$@\"; else k0s kubectl \"$@\"; fi; }; echo '===PODS==='; kc get pods --all-namespaces -o json 2>/dev/null || echo '{\"items\":[]}'; echo '===NODES==='; kc get nodes -o json 2>/dev/null || echo '{\"items\":[]}'"
    let cmd = if ($systemd_snippet | is-not-empty) { $"($cmd_base); ($systemd_snippet)" } else { $cmd_base }
    let result = (comp-ssh-run $info.user $info.key $info.host $cmd)
    if (is-debug-level 2) {
        print --stderr $"[live] SSH exit=($result.exit_code) stdout_len=($result.stdout | str length)"
    }
    if $result.exit_code != 0 { return $empty }
    let all_lines = ($result.stdout | str replace --all "\r" "" | lines)
    let pods_idx     = ($all_lines | enumerate | where { ($in.item | str trim) == "===PODS===" }     | get 0? | get -o index | default (-1))
    let nodes_idx    = ($all_lines | enumerate | where { ($in.item | str trim) == "===NODES===" }    | get 0? | get -o index | default (-1))
    let systemd_idx  = ($all_lines | enumerate | where { ($in.item | str trim) == "===SYSTEMD===" }  | get 0? | get -o index | default (-1))
    if (is-debug-level 3) {
        print --stderr $"[live] pods_idx=($pods_idx) nodes_idx=($nodes_idx) systemd_idx=($systemd_idx) total_lines=($all_lines | length)"
    }
    let pods = if $pods_idx >= 0 {
        let from = ($pods_idx + 1)
        let raw  = if $nodes_idx > $pods_idx { $all_lines | skip $from | first ($nodes_idx - $from) } else { $all_lines | skip $from }
        try { $raw | str join "\n" | from json | get -o items | default [] } catch {|e|
            if (is-debug-level 1) {
                print --stderr $"[live] pods JSON parse error: ($e.msg | str substring 0..120)"
                print --stderr $"[live] pods first line: ($raw | get 0? | default '')"
            }
            []
        }
    } else { [] }
    let nodes = if $nodes_idx >= 0 {
        let from = ($nodes_idx + 1)
        let raw  = if $systemd_idx > $nodes_idx { $all_lines | skip $from | first ($systemd_idx - $from) } else { $all_lines | skip $from }
        try { $raw | str join "\n" | from json | get -o items | default [] } catch {|e|
            if (is-debug-level 1) {
                print --stderr $"[live] nodes JSON parse error: ($e.msg | str substring 0..120)"
            }
            []
        }
    } else { [] }
    let systemd = if $systemd_idx >= 0 {
        $all_lines | skip ($systemd_idx + 1)
        | each {|ln|
            let parts = ($ln | str trim | split column ":" name status)
            if ($parts | length) >= 1 and ($parts | get 0 | get name | is-not-empty) {
                { ($parts | get 0 | get name): ($parts | get 0 | get status | str trim) }
            } else { {} }
        }
        | reduce -f {} {|it, acc| $acc | merge $it }
    } else { {} }
    if (is-debug-level 2) {
        print --stderr $"[live] parsed pods=($pods | length) nodes=($nodes | length) systemd_keys=($systemd | columns | length)"
    }
    { pods: $pods, nodes: $nodes, systemd: $systemd }
}

# Public API: return pod records for a server (used by describe-pod and external callers).
export def comp-ssh-pods [ws_root: string, infra: string, server: string]: nothing -> list {
    (comp-ssh-k8s-data $ws_root $infra $server).pods
}

# Run kubectl describe pod -n <namespace> <pod> via SSH. Returns describe output as string.
export def comp-ssh-describe-pod [ws_root: string, infra: string, server: string, namespace: string, pod: string]: nothing -> string {
    let info = (comp-server-ssh-info $ws_root $infra $server)
    let cmd  = $"if command -v kubectl >/dev/null 2>&1; then kubectl describe pod -n ($namespace) ($pod); else k0s kubectl describe pod -n ($namespace) ($pod); fi"
    let result = (comp-ssh-run $info.user $info.key $info.host $cmd)
    if $result.exit_code != 0 { $result.stderr | str trim } else { $result.stdout | str trim }
}

# Summarise pod records (from kubectl -o json) into {live, detail}.
def comp-kubectl-summarise [pods: list]: nothing -> record {
    if ($pods | is-empty) { return { live: "deployed", detail: "no pods" } }
    # Exclude Succeeded pods (completed jobs/migrations) — they never return to Running
    # and would distort the ratio. Failed phase and error-waiting pods are kept and
    # classified as degraded.
    let active  = ($pods | where { ($in | get -o status | default {} | get -o phase | default "") != "Succeeded" })
    let total   = ($active | length)
    let running = ($active | where { ($in | get -o status | default {} | get -o phase | default "") == "Running" } | length)
    let pending = ($active | where { ($in | get -o status | default {} | get -o phase | default "") == "Pending"  } | length)

    # Any pod in Failed phase OR any container waiting with an error reason → degraded.
    let error_reasons = ["CrashLoopBackOff", "ImagePullBackOff", "ErrImagePull",
                         "Error", "OOMKilled", "CreateContainerError",
                         "CreateContainerConfigError", "RunContainerError",
                         "InvalidImageName", "PostStartHookError"]
    let failing = ($active | where { |p|
        let phase = ($p | get -o status | default {} | get -o phase | default "")
        if $phase == "Failed" { true } else {
            let cs  = ($p | get -o status | default {} | get -o containerStatuses     | default [])
            let ics = ($p | get -o status | default {} | get -o initContainerStatuses | default [])
            ($cs | append $ics) | any { |c|
                ($c | get -o state | default {} | get -o waiting | default {} | get -o reason | default "") in $error_reasons
            }
        }
    } | length)

    let live = if $failing > 0       { "degraded"
    } else if $pending > 0           { "starting"
    } else if $total == 0            { "deployed"
    } else if $running == $total     { "healthy"
    } else                           { "partial" }

    let detail = if $failing > 0 {
        $"($running)/($total) pods running  ($failing) failing"
    } else {
        $"($running)/($total) pods running"
    }
    { live: $live, detail: $detail }
}

# Filter pod records by namespace (exact match) and name substring.
def comp-filter-pods [namespace: string, search: string, pods: list]: nothing -> list {
    let ns_filtered = if ($namespace | is-not-empty) {
        $pods | where { ($in | get -o metadata | default {} | get -o namespace | default "") == $namespace }
    } else { $pods }
    $ns_filtered | where { ($in | get -o metadata | default {} | get -o name | default "") | str contains $search }
}

# Summarise node records (from kubectl -o json) into {live, detail}.
def comp-kubectl-nodes-summarise [nodes: list]: nothing -> record {
    if ($nodes | is-empty) { return { live: "—", detail: "no node data" } }
    let total = ($nodes | length)
    let ready = ($nodes | where { |n|
        $n | get -o status | default {} | get -o conditions | default []
        | any { ($in | get -o type | default "") == "Ready" and ($in | get -o status | default "") == "True" }
    } | length)
    let live = if $ready == $total { "healthy"
    } else if $ready == 0          { "degraded"
    } else                         { "partial" }
    { live: $live, detail: $"($ready)/($total) nodes Ready" }
}

# Live check for a component using pre-fetched k8s_data {pods, nodes}.
# Resolves strategy from comp.live_check; falls back to namespace/pod_selector on the component.
# 'systemd strategy always returns "—" in live (fast) mode — requires prvng c health.
# Returns {live: string, detail: string}.
export def comp-live-check [name: string, comp: record, k8s_data: record]: nothing -> record {
    let lc       = ($comp | get -o live_check | default {})
    let strategy = ($lc | get -o strategy | default "none" | into string)
    match $strategy {
        "k8s_pods" => {
            if ($k8s_data.pods | is-empty) { return { live: "—", detail: "no pod data" } }
            let ns  = do {
                let explicit = ($lc | get -o namespace | default "")
                if ($explicit | is-not-empty) { $explicit } else { $comp | get -o namespace | default "" }
            }
            let sel = do {
                let explicit = ($lc | get -o selector | default "")
                if ($explicit | is-not-empty) { $explicit } else {
                    let ps = ($comp | get -o pod_selector | default "")
                    if ($ps | is-not-empty) { $ps } else { $name | str replace --all "_" "-" }
                }
            }
            let matching = (comp-filter-pods $ns $sel $k8s_data.pods)
            if ($matching | is-empty) { return { live: "—", detail: $"no pods: ($sel)" } }
            comp-kubectl-summarise $matching
        }
        "k8s_nodes" => {
            if ($k8s_data.nodes | is-empty) { return { live: "—", detail: "no node data" } }
            let sel = ($lc | get -o selector | default "")
            let filtered = if ($sel | is-not-empty) {
                $k8s_data.nodes | where { ($in | get -o metadata | default {} | get -o name | default "") | str contains $sel }
            } else {
                $k8s_data.nodes
            }
            comp-kubectl-nodes-summarise $filtered
        }
        "k8s_api" => {
            # apiserver healthy if kubectl returned any node data
            if ($k8s_data.nodes | is-not-empty) or ($k8s_data.pods | is-not-empty) {
                { live: "healthy", detail: "apiserver ok" }
            } else {
                { live: "—", detail: "apiserver unreachable" }
            }
        }
        "systemd" => {
            let svc = ($lc | get -o service | default "")
            if ($svc | is-empty) { return { live: "—", detail: "health: systemd" } }
            let units = ($k8s_data | get -o systemd | default {})
            if ($units | is-empty) { return { live: "—", detail: "health: systemd" } }
            let active = ($units | get -o $svc | default "")
            match $active {
                "active"   => { live: "healthy", detail: $"systemd: ($svc) active" },
                "inactive" => { live: "degraded", detail: $"systemd: ($svc) inactive" },
                "failed"   => { live: "degraded", detail: $"systemd: ($svc) failed" },
                _          => { live: "—", detail: $"systemd: ($svc) ($active)" },
            }
        }
        "on_demand" => { live: "—", detail: "on-demand" }
        _ => { live: "—", detail: "no live check" }
    }
}

# Extract pod summary records for a component from pre-fetched pod JSON records.
# Returns list of {namespace, pod, ready, status}.
export def comp-pods-for [namespace: string, name: string, pods: list, pod_selector: string = ""]: nothing -> list {
    let search = if ($pod_selector | is-not-empty) { $pod_selector } else { $name | str replace --all "_" "-" }
    (comp-filter-pods $namespace $search $pods)
    | each {|p|
        let meta   = ($p | get -o metadata | default {})
        let status = ($p | get -o status   | default {})
        let cs     = ($status | get -o containerStatuses | default [])
        let ready  = ($cs | where { $in.ready? | default false } | length)
        {
            namespace: ($meta | get -o namespace | default ""),
            pod:       ($meta | get -o name      | default ""),
            ready:     $"($ready)/($cs | length)",
            status:    ($status | get -o phase   | default ""),
        }
    }
}