import { spawn } from 'node:child_process'
import { isBuiltin } from 'node:module'
import { join } from 'node:path'
import type { Plugin, Rollup } from 'vite'

type NormalizedInputOptions = Rollup.NormalizedInputOptions
type NormalizedOutputOptions = Rollup.NormalizedOutputOptions
type OutputBundle = Rollup.OutputBundle
type OutputChunk = Rollup.OutputChunk

// A shared-chunk Electron import killed plain-Node daemons in v1.4.129-rc.1 (#7642).
// Scan every reachable fork/worker chunk for Electron requires; smoke-load daemon-entry to verify module resolution.

// The CLI loads these paths after electron-vite replaces out/main.
export const CLI_MAIN_ENTRY_NAMES = [
  'agent-hooks/managed-agent-hook-controls',
  'gitlab/project-ref-parser',
  'orca-profiles/profile-index-store',
  'claude-accounts/keychain',
  'skills/bundled-skill-install/cli-entry',
  'macos-tree-clone',
  'orcad/orcad-stale-lock-reclaim',
  ...[
    'access',
    'active-location',
    'storage-classification',
    'offline-settings',
    'backup-path',
    'database-recovery',
    'domain-reader',
    'recovery-command'
  ].map((module) => `persistence/profile-state/profile-state-${module}`),
  'persistence/profile-state/legacy-json/profile-state-export-path',
  'persistence/profile-state/legacy-json/profile-state-recovery',
  'startup/http1-compatibility-marker'
] as const

// Plain-Node processes and CLI modules cannot load Electron's API.
const PLAIN_NODE_ENTRY_NAMES = [
  'browser-extension-native-host-supervisor-entry',
  'daemon-entry',
  'parcel-watcher-process-entry',
  'session-scanner-service-entry',
  'computer-sidecar',
  'wsl-transcript-fs-process-entry',
  'orcad/orcad-local-serve-selection-entry',
  ...CLI_MAIN_ENTRY_NAMES
] as const

// Electron is unavailable in main-process worker threads too (verified Electron 43); scan their graphs rather than trusting entry comments.
const WORKER_THREAD_ENTRY_NAMES = [
  'stt-worker',
  'warp-theme-parser-worker',
  'foreign-sqlite-reader-entry',
  'main-thread-hang-watchdog-entry',
  'port-scan-command-worker-entry',
  'command-path-directory-worker-entry',
  'worker-thread-child-process-entry',
  'usage-scan-worker-entry',
  'workspace-space-scan-worker-entry',
  'claude-profile-setup-worker-entry',
  'profile-state-backup-worker-entry',
  'profile-state-writer-worker-entry'
] as const

export const GUARDED_ENTRY_NAMES = [
  ...PLAIN_NODE_ENTRY_NAMES,
  ...WORKER_THREAD_ENTRY_NAMES
] as const

type EntryRuntime = 'plain-Node process' | 'worker thread'

// Subpaths (electron/main) are as unloadable as the bare module under plain Node.
const ELECTRON_REQUIRE_RE = /require\(\s*["'`]electron(?:\/[^"'`]+)?["'`]\s*\)/

// Pin guarded names to Rollup inputs or renames silently remove entries from the guard.
function assertEntryNamesAreRollupInputs(input: NormalizedInputOptions['input']): void {
  if (typeof input === 'string' || Array.isArray(input)) {
    return
  }
  const inputNames = new Set(Object.keys(input))
  const missing = GUARDED_ENTRY_NAMES.filter((name) => !inputNames.has(name))
  if (missing.length > 0) {
    throw new Error(
      `[plain-node-entry-guard] guarded ${missing.map((name) => `"${name}"`).join(', ')} ` +
        `${missing.length === 1 ? 'is not a rollup input' : 'are not rollup inputs'} anymore. ` +
        `Update PLAIN_NODE_ENTRY_NAMES/WORKER_THREAD_ENTRY_NAMES in plain-node-entry-guard.ts to ` +
        `the current entry names — a stale name silently stops guarding that entry.`
    )
  }
}

function collectReachableChunks(
  entry: OutputChunk,
  byFileName: Map<string, OutputChunk>
): OutputChunk[] {
  const seen = new Set<string>()
  const reachable: OutputChunk[] = []
  const stack = [entry.fileName]
  while (stack.length > 0) {
    const fileName = stack.pop() as string
    if (seen.has(fileName)) {
      continue
    }
    seen.add(fileName)
    const chunk = byFileName.get(fileName)
    if (!chunk) {
      continue
    }
    reachable.push(chunk)
    for (const imported of [...chunk.imports, ...chunk.dynamicImports]) {
      stack.push(imported)
    }
  }
  return reachable
}

function assertNoElectronRequire(
  entryName: string,
  entry: OutputChunk,
  byFileName: Map<string, OutputChunk>,
  electronFreeChunkCode: Map<OutputChunk, string>,
  runtime: EntryRuntime = 'plain-Node process'
): void {
  for (const chunk of collectReachableChunks(entry, byFileName)) {
    const code = chunk.code
    if (electronFreeChunkCode.get(chunk) === code) {
      continue
    }
    if (ELECTRON_REQUIRE_RE.test(code)) {
      throw new Error(
        `[plain-node-entry-guard] "${entryName}" reaches chunk "${chunk.fileName}" that ` +
          `requires electron. "${entryName}" runs as a ${runtime}, where ` +
          `require("electron") throws MODULE_NOT_FOUND and kills it at startup (the ` +
          `v1.4.129-rc.1 daemon outage). Keep electron imports out of its module graph.`
      )
    }
    electronFreeChunkCode.set(chunk, code)
  }
}

// Relocated Windows daemon copies only these packages; other bare requires cause silent fallback to an unrelocated daemon that updates kill.
const DAEMON_HOST_MIRRORED_PACKAGES = [
  '@orca/process-host',
  'node-pty',
  '@vscode/windows-process-tree'
]
const BARE_REQUIRE_RE = /require\(\s*["'`]([^"'`./][^"'`]*)["'`]\s*\)/g

function packageOfSpecifier(specifier: string): string {
  const parts = specifier.split('/')
  return specifier.startsWith('@') ? parts.slice(0, 2).join('/') : parts[0]!
}

function assertDaemonExternalsAreMirrored(
  entry: OutputChunk,
  byFileName: Map<string, OutputChunk>
): void {
  for (const chunk of collectReachableChunks(entry, byFileName)) {
    for (const match of chunk.code.matchAll(BARE_REQUIRE_RE)) {
      const specifier = match[1]!
      if (specifier.startsWith('node:') || isBuiltin(specifier)) {
        continue
      }
      if (!DAEMON_HOST_MIRRORED_PACKAGES.includes(packageOfSpecifier(specifier))) {
        throw new Error(
          `[plain-node-entry-guard] "daemon-entry" reaches chunk "${chunk.fileName}" that ` +
            `requires "${specifier}", which the relocated Windows daemon-host does not mirror ` +
            `(daemon-host-manifest.ts). Keep it out of the daemon graph, or mirror it there.`
        )
      }
    }
  }
}

// Owned by the argv parser in src/main/daemon/daemon-entry.ts — keep in sync.
const DAEMON_USAGE_PREFIX = 'Usage: daemon-entry'

export type SmokeTimings = {
  timeoutMs: number
  // daemon-entry traps SIGTERM and awaits a native shutdown, so the deadline
  // needs an uncatchable follow-up to stay a deadline.
  killGraceMs: number
}

const DEFAULT_SMOKE_TIMINGS: SmokeTimings = { timeoutMs: 15_000, killGraceMs: 2_000 }

// Bound the wait for stderr to flush after exit; a grandchild inheriting stdio
// can hold the pipes open long after the child is gone.
const SMOKE_STDERR_DRAIN_MS = 250

type SmokeResult = {
  status: number | null
  signal: NodeJS.Signals | null
  stderr: string
  error?: Error
  timedOut: boolean
}

// spawnSync timeout waits after SIGTERM; trapped signals can hang builds, so escalate asynchronously to SIGKILL.
function runDaemonEntry(entryPath: string, timings: SmokeTimings): Promise<SmokeResult> {
  return new Promise((resolve) => {
    const child = spawn(process.execPath, [entryPath], { stdio: ['ignore', 'ignore', 'pipe'] })
    let stderr = ''
    let timedOut = false
    let settled = false
    let forceKillTimer: NodeJS.Timeout | undefined
    let drainTimer: NodeJS.Timeout | undefined

    child.stderr.setEncoding('utf8')
    child.stderr.on('data', (chunk: string) => {
      stderr += chunk
    })

    const deadlineTimer = setTimeout(() => {
      timedOut = true
      child.kill('SIGTERM')
      forceKillTimer = setTimeout(() => child.kill('SIGKILL'), timings.killGraceMs)
    }, timings.timeoutMs)

    const finish = (status: number | null, signal: NodeJS.Signals | null, error?: Error): void => {
      if (settled) {
        return
      }
      settled = true
      clearTimeout(deadlineTimer)
      clearTimeout(forceKillTimer)
      clearTimeout(drainTimer)
      resolve({ status, signal, stderr, error, timedOut })
    }

    child.on('error', (error: Error) => finish(null, null, error))
    // 'close' gives the full stderr; 'exit' is the fallback so a held-open pipe
    // cannot outlast the process itself.
    child.on('close', (status, signal) => finish(status, signal))
    child.on('exit', (status, signal) => {
      drainTimer = setTimeout(() => finish(status, signal), SMOKE_STDERR_DRAIN_MS)
    })
  })
}

// Smoke proves plain-Node graph resolution; static scan catches Electron leaks because dev node_modules can make require("electron") succeed.
async function smokeLoadDaemonEntry(outputDir: string, timings: SmokeTimings): Promise<void> {
  const entryPath = join(outputDir, 'daemon-entry.js')
  const result = await runDaemonEntry(entryPath, timings)
  if (result.error) {
    throw new Error(
      `[plain-node-entry-guard] could not smoke-load daemon-entry.js under plain Node: ` +
        `${result.error.message}`
    )
  }
  // Almost always means the daemon stopped rejecting an empty argv and started
  // listening instead.
  if (result.timedOut) {
    throw new Error(
      `[plain-node-entry-guard] daemon-entry.js did not exit within ${timings.timeoutMs}ms on an ` +
        `empty argv under plain Node, so the smoke killed it.`
    )
  }
  if (result.signal) {
    throw new Error(
      `[plain-node-entry-guard] daemon-entry.js was killed by ${result.signal} under plain Node.`
    )
  }
  const stderr = result.stderr
  if (/Cannot find module|MODULE_NOT_FOUND/.test(stderr)) {
    throw new Error(
      `[plain-node-entry-guard] daemon-entry.js failed to load under plain Node:\n${stderr}`
    )
  }
  if (result.status === 0 || !stderr.includes(DAEMON_USAGE_PREFIX)) {
    throw new Error(
      `[plain-node-entry-guard] daemon-entry.js did not reject an empty argv under plain Node ` +
        `(expected a non-zero exit and the "${DAEMON_USAGE_PREFIX}" error, got exit ` +
        `${result.status}). stderr:\n${stderr}`
    )
  }
}

export function createPlainNodeEntryGuardPlugin(
  smokeTimings: SmokeTimings = DEFAULT_SMOKE_TIMINGS
): Plugin {
  let daemonOutputDir: string | undefined

  return {
    name: 'orca-plain-node-entry-guard',
    buildStart(options: NormalizedInputOptions) {
      assertEntryNamesAreRollupInputs(options.input)
    },
    writeBundle(options: NormalizedOutputOptions, bundle: OutputBundle) {
      // Skip dev-watch smoke or every rebuild respawns daemon-entry; gate produced builds only.
      if (this.meta.watchMode) {
        return
      }
      const chunks = Object.values(bundle).filter(
        (item): item is OutputChunk => item.type === 'chunk'
      )
      const byFileName = new Map(chunks.map((chunk) => [chunk.fileName, chunk]))
      const entryByName = new Map<string, OutputChunk>()
      for (const chunk of chunks) {
        if (chunk.isEntry && chunk.name) {
          entryByName.set(chunk.name, chunk)
        }
      }

      const electronFreeChunkCode = new Map<OutputChunk, string>()
      for (const entryName of PLAIN_NODE_ENTRY_NAMES) {
        const entry = entryByName.get(entryName)
        if (entry) {
          assertNoElectronRequire(
            entryName,
            entry,
            byFileName,
            electronFreeChunkCode,
            'plain-Node process'
          )
        }
      }

      for (const entryName of WORKER_THREAD_ENTRY_NAMES) {
        const entry = entryByName.get(entryName)
        if (entry) {
          assertNoElectronRequire(
            entryName,
            entry,
            byFileName,
            electronFreeChunkCode,
            'worker thread'
          )
        }
      }

      const daemonEntry = entryByName.get('daemon-entry')
      if (daemonEntry) {
        assertDaemonExternalsAreMirrored(daemonEntry, byFileName)
      }

      if (entryByName.has('daemon-entry') && options.dir) {
        daemonOutputDir = options.dir
      }
    },
    async closeBundle() {
      if (daemonOutputDir) {
        const outputDir = daemonOutputDir
        daemonOutputDir = undefined
        await smokeLoadDaemonEntry(outputDir, smokeTimings)
      }
    }
  }
}