#!/usr/bin/env nu
# reflection/modules/validate.nu — ADR constraint validation + justfile convention checker.
#
# Interprets the typed constraint_check_type ADT exported by adrs/adr-schema.ncl.
# Each constraint.check record has a `tag` discriminant; this module dispatches
# execution per variant and returns a structured result.
#
# Commands:
#   validate check-constraint <c> — run a single constraint record
#   validate check-adr <id>       — run all constraints for one ADR
#   validate check-all            — run all constraints across all accepted ADRs
#   validate justfile             — validate project justfile against convention schema
#
# Error handling: do { ... } | complete — never panics, always returns a result.

use env.nu *
use store.nu [daemon-export-safe]

# ── Internal helpers ────────────────────────────────────────────────────────

def adr-root []: nothing -> string {
  $env.ONTOREF_PROJECT_ROOT? | default $env.ONTOREF_ROOT
}

def adr-files []: nothing -> list<string> {
  glob ([(adr-root), "adrs", "adr-*.ncl"] | path join)
}

# Resolve a check path (may be file or directory) relative to project root.
def resolve-path [rel: string]: nothing -> string {
  [(adr-root), $rel] | path join
}

# Run a 'Grep check: ripgrep pattern across paths; empty/non-empty assertion.
def run-grep [check: record]: nothing -> record {
  let paths = ($check.paths | each { |p| resolve-path $p })
  let valid_paths = ($paths | where { |p| $p | path exists })

  if ($valid_paths | is-empty) {
    return {
      passed: false,
      detail: $"No paths exist: ($check.paths | str join ', ')"
    }
  }

  let result = do {
    ^rg --no-heading --count-matches $check.pattern ...$valid_paths
  } | complete

  let has_matches = ($result.exit_code == 0)

  if $check.must_be_empty {
    {
      passed: (not $has_matches),
      detail: (if $has_matches { $"Pattern found (violation): ($result.stdout | str trim)" } else { "Pattern absent — ok" })
    }
  } else {
    {
      passed: $has_matches,
      detail: (if $has_matches { "Pattern present — ok" } else { "Pattern absent (required match missing)" })
    }
  }
}

# Run a 'Cargo check: parse Cargo.toml, verify forbidden_deps absent from [dependencies].
def run-cargo [check: record]: nothing -> record {
  let cargo_path = ([(adr-root), "crates", $check.crate, "Cargo.toml"] | path join)
  if not ($cargo_path | path exists) {
    return { passed: false, detail: $"Cargo.toml not found: ($cargo_path)" }
  }

  let cargo = (open $cargo_path)
  let all_dep_sections = [
    ($cargo.dependencies? | default {}),
    ($cargo."dev-dependencies"? | default {}),
    ($cargo."build-dependencies"? | default {}),
  ]
  let all_dep_keys = ($all_dep_sections | each { |d| $d | columns } | flatten)

  let found = ($check.forbidden_deps | where { |dep| $dep in $all_dep_keys })
  {
    passed: ($found | is-empty),
    detail: (if ($found | is-empty) { "No forbidden deps found" } else { $"Forbidden deps present: ($found | str join ', ')" })
  }
}

# Run a 'NuCmd check: execute cmd via nu -c, assert exit code.
def run-nucmd [check: record]: nothing -> record {
  let result = do { nu -c $check.cmd } | complete
  let expected = ($check.expect_exit? | default 0)
  {
    passed: ($result.exit_code == $expected),
    detail: (if ($result.exit_code == $expected) {
      "Command exited as expected"
    } else {
      $"Exit ($result.exit_code) ≠ expected ($expected): ($result.stderr | str trim)"
    })
  }
}

# Run an 'ApiCall check: GET endpoint, navigate json_path, compare to expected.
def run-apicall [check: record]: nothing -> record {
  let result = do { ^curl -sf $check.endpoint } | complete
  if $result.exit_code != 0 {
    return { passed: false, detail: $"curl failed (exit ($result.exit_code)): ($result.stderr | str trim)" }
  }
  let value = do { $result.stdout | from json | get $check.json_path } | complete
  if $value.exit_code != 0 {
    return { passed: false, detail: $"json_path '($check.json_path)' not found in response" }
  }
  let actual = $value.stdout | str trim
  let expected = ($check.expected | into string)
  {
    passed: ($actual == $expected),
    detail: (if ($actual == $expected) { "Value matches" } else { $"Expected '($expected)', got '($actual)'" })
  }
}

# Run a 'FileExists check: assert presence or absence of a path.
def run-fileexists [check: record]: nothing -> record {
  let p = (resolve-path $check.path)
  let exists = ($p | path exists)
  let want = ($check.present? | default true)
  {
    passed: ($exists == $want),
    detail: (if ($exists == $want) {
      (if $want { $"File exists: ($p)" } else { $"File absent: ($p)" })
    } else {
      (if $want { $"File missing: ($p)" } else { $"File unexpectedly present: ($p)" })
    })
  }
}

# Dispatch a single constraint.check record to the appropriate runner.
def dispatch-check [check: record]: nothing -> record {
  match $check.tag {
    "Grep"       => (run-grep $check),
    "Cargo"      => (run-cargo $check),
    "NuCmd"      => (run-nucmd $check),
    "ApiCall"    => (run-apicall $check),
    "FileExists" => (run-fileexists $check),
    _            => { passed: false, detail: $"Unknown check tag: ($check.tag)" }
  }
}

# ── Public commands ──────────────────────────────────────────────────────────

# Run a single constraint record.
# Returns { constraint_id, severity, passed, detail }.
export def "validate check-constraint" [
  constraint: record,  # Constraint record from an ADR export
]: nothing -> record {
  if ($constraint.check? | is-empty) {
    return {
      constraint_id: ($constraint.id? | default "unknown"),
      severity: ($constraint.severity? | default "Hard"),
      passed: false,
      detail: "No typed 'check' field — constraint uses deprecated check_hint only"
    }
  }

  let result = dispatch-check $constraint.check
  {
    constraint_id: $constraint.id,
    severity:      $constraint.severity,
    passed:        $result.passed,
    detail:        $result.detail,
  }
}

# Run all constraints for a single ADR by id ("001", "adr-001", or "adr-001-slug").
# Returns a list of { constraint_id, severity, passed, detail }.
export def "validate check-adr" [
  id: string,    # ADR id: "001", "adr-001", or full stem
  --fmt: string = "table",  # Output: table | json | yaml
]: nothing -> any {
  let canonical = if ($id | str starts-with "adr-") { $id } else { $"adr-($id)" }
  let files = (glob ([(adr-root), "adrs", $"($canonical)-*.ncl"] | path join))
  if ($files | is-empty) {
    error make { msg: $"ADR '($id)' not found in adrs/" }
  }

  let adr = (daemon-export-safe ($files | first))
  if $adr == null {
    error make { msg: $"ADR '($id)' failed to export" }
  }

  let results = ($adr.constraints | each { |c|
    if ($c.check? | is-empty) {
      {
        constraint_id: $c.id,
        severity:      $c.severity,
        passed:        false,
        detail:        "check field missing — uses deprecated check_hint"
      }
    } else {
      validate check-constraint $c
    }
  })

  match $fmt {
    "json"  => { $results | to json },
    "yaml"  => { $results | to yaml },
    _       => { $results | table --expand },
  }
}

# Run all Hard constraints across all accepted ADRs.
# Returns { adr_id, constraint_id, severity, passed, detail } records.
# Exit code is non-zero if any Hard constraint fails.
export def "validate check-all" [
  --fmt: string = "table",   # Output: table | json | yaml
  --hard-only,               # Include only Hard constraints (default: all)
]: nothing -> any {
  let all_results = (adr-files | each { |ncl|
    let adr = (daemon-export-safe $ncl)
    if $adr == null { return [] }
    if $adr.status != "Accepted" { return [] }

    $adr.constraints | each { |c|
      if $hard_only and $c.severity != "Hard" { return null }
      let res = if ($c.check? | is-empty) {
        { passed: false, detail: "check field missing — uses deprecated check_hint" }
      } else {
        dispatch-check $c.check
      }
      {
        adr_id:        $adr.id,
        constraint_id: $c.id,
        severity:      $c.severity,
        passed:        $res.passed,
        detail:        $res.detail,
      }
    } | compact
  } | flatten)

  let failures = ($all_results | where passed == false)
  let total    = ($all_results | length)
  let n_fail   = ($failures | length)

  let output = match $fmt {
    "json"  => { $all_results | to json },
    "yaml"  => { $all_results | to yaml },
    _       => { $all_results | table --expand },
  }

  print $output

  if ($failures | is-not-empty) {
    error make {
      msg: $"($n_fail) of ($total) constraints failed",
    }
  }
}

# Show a summary of constraint validation state across all accepted ADRs.
# Intended for ontoref status / describe guides.
export def "validate summary" []: nothing -> record {
  let all_results = (adr-files | each { |ncl|
    let adr = (daemon-export-safe $ncl)
    if $adr == null { return [] }
    if $adr.status != "Accepted" { return [] }

    $adr.constraints | each { |c|
      let res = if ($c.check? | is-empty) {
        { passed: false }
      } else {
        dispatch-check $c.check
      }
      { severity: $c.severity, passed: $res.passed }
    } | compact
  } | flatten)

  let hard = ($all_results | where severity == "Hard")
  let soft = ($all_results | where severity == "Soft")
  {
    hard_total:   ($hard | length),
    hard_passing: ($hard | where passed == true | length),
    soft_total:   ($soft | length),
    soft_passing: ($soft | where passed == true | length),
  }
}

# ── Justfile convention validator ────────────────────────────────────────────

# Detect module system from root justfile content.
def detect-just-module-system [justfile_path: string]: nothing -> string {
  if not ($justfile_path | path exists) { return "Flat" }
  let content = (open --raw $justfile_path)
  let has_import = ($content | lines | any { |l| $l =~ '^import ' })
  let has_mod    = ($content | lines | any { |l| $l =~ '^mod ' })
  if $has_import and $has_mod { "Hybrid" } else if $has_import { "Import" } else if $has_mod { "Mod" } else { "Flat" }
}

# Extract recipe names from a just file (lines starting with identifier at col 0, followed by whitespace or ':').
def extract-just-recipes [file_path: string]: nothing -> list<string> {
  if not ($file_path | path exists) { return [] }
  open --raw $file_path
  | lines
  | where { |l| not ($l | str starts-with "#") and not ($l | str starts-with " ") and not ($l | str starts-with "\t") and not ($l | str starts-with "[") and ($l =~ '^[a-z_@][a-z0-9_@-]*[\s:]') }
  | each { |l| $l | str replace -r '[\s:].*' '' | str replace -r '^@' '' }
  | where { |n| ($n | str length) > 0 }
  | uniq
}

# Extract variable names from a just file (lines with ':=' at col 0).
def extract-just-variables [file_path: string]: nothing -> list<string> {
  if not ($file_path | path exists) { return [] }
  open --raw $file_path
  | lines
  | where { |l| $l =~ ':=' and not ($l | str starts-with "#") and not ($l | str starts-with " ") and not ($l | str starts-with "\t") }
  | each { |l| $l | split row ':=' | first | str trim }
  | where { |n| ($n | str length) > 0 }
  | uniq
}

# Validate the project justfile tree against reflection/schemas/justfile-convention.ncl.
# Reports missing required modules, recipes, and variables.
export def "validate justfile" [
  --root (-r): string = "",   # Project root (default: ONTOREF_PROJECT_ROOT or ONTOREF_ROOT)
  --fmt (-f): string = "",    # json | text (default: actor-aware)
  --actor (-a): string = "",
]: nothing -> nothing {
  let project_root = if ($root | is-not-empty) { $root } else {
    $env.ONTOREF_PROJECT_ROOT? | default $env.ONTOREF_ROOT
  }
  let actor = if ($actor | is-not-empty) { $actor } else { $env.ONTOREF_ACTOR? | default "developer" }
  let fmt   = if ($fmt | is-not-empty) { $fmt } else if $actor == "agent" { "json" } else { "text" }

  let schema_file = ([$env.ONTOREF_ROOT, "reflection", "schemas", "justfile-convention.ncl"] | path join)
  if not ($schema_file | path exists) {
    error make { msg: $"Convention schema not found: ($schema_file)" }
  }

  let exported = (daemon-export-safe $schema_file --import-path $env.ONTOREF_ROOT)
  if $exported == null {
    error make { msg: "Failed to export justfile-convention.ncl" }
  }
  let conv = $exported.Convention

  # Locate root justfile
  let root_just = ([$project_root, "justfile"] | path join)
  let detected_system = (detect-just-module-system $root_just)

  # Collect all just files in the convention directory
  let just_dir  = ([$project_root, $conv.directory] | path join)
  let all_files = (
    [[$root_just]] ++
    (if ($just_dir | path exists) {
      glob $"($just_dir)/*($conv.extension)"
    } else { [] })
  ) | flatten | where { |f| $f | path exists }

  # Extract recipes and variables across all files
  let all_recipes  = ($all_files | each { |f| extract-just-recipes $f }  | flatten | uniq)
  let all_variables = ($all_files | each { |f| extract-just-variables $f } | flatten | uniq)

  # Check canonical modules: for each module, does {dir}/{name}{ext} exist?
  let module_results = ($conv.canonical_modules | each { |m|
    let mfile = ([$project_root, $conv.directory, $"($m.name)($conv.extension)"] | path join)
    let present = ($mfile | path exists)
    {
      name:        $m.name,
      required:    $m.required,
      present:     $present,
      description: $m.description,
    }
  })

  let missing_required_modules = ($module_results | where required == true and present == false | get name)
  let missing_optional_modules = ($module_results | where required == false and present == false | get name)

  # Check required recipes
  let missing_recipes = ($conv.required_recipes | where { |r| not ($r in $all_recipes) })

  # Check required variables
  let missing_variables = ($conv.required_variables | where { |v| not ($v in $all_variables) })

  let ok = ($missing_required_modules | is-empty) and ($missing_recipes | is-empty) and ($missing_variables | is-empty)

  let result = {
    ok:                       $ok,
    module_system_detected:   $detected_system,
    module_system_expected:   ($conv.system | into string),
    modules_present:          ($module_results | where present == true | get name),
    missing_required_modules: $missing_required_modules,
    missing_optional_modules: $missing_optional_modules,
    recipes_found:            ($all_recipes | length),
    missing_required_recipes: $missing_recipes,
    variables_found:          ($all_variables | length),
    missing_required_variables: $missing_variables,
  }

  if $fmt == "json" {
    print ($result | to json)
    return
  }

  # Text output
  let status_line = if $ok { "✓ justfile validates against convention" } else { "✗ justfile convention violations found" }
  print $status_line
  print $"  module system: detected=($detected_system) expected=($conv.system)"
  print $"  modules present: ($result.modules_present | str join ', ')"

  if ($missing_required_modules | is-not-empty) {
    print $"  MISSING required modules: ($missing_required_modules | str join ', ')"
  }
  if ($missing_optional_modules | is-not-empty) {
    print $"  optional modules absent: ($missing_optional_modules | str join ', ')"
  }
  if ($missing_recipes | is-not-empty) {
    print $"  MISSING required recipes: ($missing_recipes | str join ', ')"
  }
  if ($missing_variables | is-not-empty) {
    print $"  MISSING required variables: ($missing_variables | str join ', ')"
  }
  if $ok {
    print $"  recipes found: ($result.recipes_found)  variables found: ($result.variables_found)"
  }
}