#!/usr/bin/env nu
# install/config-setup.nu — validate config.ncl and probe external services
#
# Run after editing config (or after first install) to confirm everything is wired correctly.
# Safe to run any time — read-only, no side effects.
#
# Usage:
#   nu install/config-setup.nu
#   nu install/config-setup.nu --config /custom/path/config.ncl

def main [
  --config: string = "",   # path to config.ncl (default: ~/.config/ontoref/config.ncl)
] {
  let platform = (sys host | get name)
  let is_mac   = ((^uname) == "Darwin")

  let config_path = if ($config | is-empty) {
    $"($env.HOME)/.config/ontoref/config.ncl"
  } else {
    $config
  }

  let data_dir = if $is_mac {
    $"($env.HOME)/Library/Application Support/ontoref"
  } else {
    $"($env.HOME)/.local/share/ontoref"
  }

  print "ontoref config-setup"
  print $"  config  ($config_path)"
  print ""

  # ── 1. Config file exists ──────────────────────────────────────────────────
  if not ($config_path | path exists) {
    print "✗ config not found"
    print $"  copy the example:  cp ($data_dir)/nulib/bootstrap.nu ... "
    print $"  or:                cp (($config_path | path dirname))/config.ncl.example ($config_path)"
    error make { msg: "config not found" }
  }
  print "✓ config file exists"

  # ── 2. Nickel typecheck ────────────────────────────────────────────────────
  let config_dir   = ($config_path | path dirname)
  let import_path  = $"($config_dir):($config_dir)/schemas:($data_dir)/schemas:($data_dir)"
  let check = (do {
    with-env { NICKEL_IMPORT_PATH: $import_path } {
      ^nickel typecheck $config_path
    }
  } | complete)

  if $check.exit_code != 0 {
    print "✗ nickel typecheck failed"
    print ($check.stderr | str trim)
    error make { msg: "config schema validation failed" }
  }
  print "✓ nickel typecheck passed"

  # ── 3. Parse config values ─────────────────────────────────────────────────
  let export = (do {
    with-env { NICKEL_IMPORT_PATH: $import_path } {
      ^nickel export --format json $config_path
    }
  } | complete)

  if $export.exit_code != 0 {
    print "✗ nickel export failed"
    print ($export.stderr | str trim)
    error make { msg: "config export failed" }
  }

  let cfg = ($export.stdout | from json)

  # ── 4. Resolve and verify path dirs ───────────────────────────────────────
  let log_path = if ($cfg.log.path | is-empty) {
    if $is_mac { $"($env.HOME)/Library/Logs/ontoref" } else { $"($env.HOME)/.local/state/ontoref/logs" }
  } else { $cfg.log.path }

  let cache_path = if ($cfg.cache.path | is-empty) {
    if $is_mac { $"($env.HOME)/Library/Caches/ontoref" } else { $"($env.HOME)/.cache/ontoref" }
  } else { $cfg.cache.path }

  let templates_dir = if ($cfg.ui.templates_dir | is-empty) {
    $"($data_dir)/templates"
  } else { $cfg.ui.templates_dir }

  let public_dir = if ($cfg.ui.public_dir | is-empty) {
    $"($data_dir)/public"
  } else { $cfg.ui.public_dir }

  print ""
  print "── paths ──────────────────────────────────────────────"

  for entry in [
    { label: "data dir",     path: $data_dir },
    { label: "templates",    path: $templates_dir },
    { label: "public",       path: $public_dir },
    { label: "log dir",      path: $log_path },
    { label: "cache dir",    path: $cache_path },
  ] {
    let exists = ($entry.path | path exists)
    let mark   = if $exists { "✓" } else { "⚠ missing (will be created on first run)" }
    print $"  ($mark)  ($entry.label)  ($entry.path)"
  }

  # ── 5. Liveness probes ────────────────────────────────────────────────────
  print ""
  print "── services ───────────────────────────────────────────"

  # DB probe
  if $cfg.db.enabled {
    let db_url = $cfg.db.url
    # Extract host:port from surrealdb://host:port/...
    let addr = ($db_url | parse "surrealdb://{rest}" | get rest.0? | default "" | split row "/" | first)
    let probe = (do { ^nc -z -w2 ...($addr | split row ":") } | complete)
    if $probe.exit_code == 0 {
      print $"  ✓  db      ($db_url)"
    } else {
      print $"  ✗  db      ($db_url)  — not reachable"
    }
  } else {
    print "  —  db      disabled"
  }

  # NATS probe
  if $cfg.nats_events.enabled {
    let nats_url = $cfg.nats_events.url
    let addr = ($nats_url | parse "nats://{rest}" | get rest.0? | default "" | split row "/" | first)
    let probe = (do { ^nc -z -w2 ...($addr | split row ":") } | complete)
    if $probe.exit_code == 0 {
      print $"  ✓  nats    ($nats_url)"
    } else {
      print $"  ✗  nats    ($nats_url)  — not reachable"
    }
  } else {
    print "  —  nats    disabled"
  }

  print ""
  print $"config-setup complete  platform=($platform)"
}