'use strict'
/**
 * platform-linux.js — Linux-specific runtime adapter
 * Loaded exclusively when process.platform === 'linux'
 */

const path = require('path')
const os = require('os')

const PLATFORM = 'linux'

// ── Writable path candidates for app userData ─────────────────────────────────
function getWritableCandidates(appDirName) {
  const candidates = []
  const xdgData = process.env.XDG_DATA_HOME
  if (xdgData) {
    candidates.push(path.join(xdgData, 'chahuadev', appDirName))
  }
  candidates.push(path.join(os.homedir(), '.local', 'share', 'chahuadev', appDirName))
  candidates.push(path.join(os.tmpdir(), appDirName))
  return candidates
}

// ── Command name normalization ────────────────────────────────────────────────
// Linux: no .cmd suffix needed — npm/npx/pnpm/yarn are native shell scripts.
function normalizeExecName(cmd) {
  return String(cmd || '').trim()
}

// ── Shell wrapping ────────────────────────────────────────────────────────────
// Linux commands run directly via node-pty — no cmd.exe-style wrapping needed.
function shouldUseShell(cmd) { // eslint-disable-line no-unused-vars
  return false
}

// Not called on Linux (shouldUseShell always false), but satisfies interface.
function buildShellSpawn(cmd, args) {
  return { file: cmd, args: args || [] }
}

// ── node-pty spawn extra options ──────────────────────────────────────────────
// useConpty is a Windows-only (ConPTY) option.  On Linux use standard PTY.
function getPtySpawnOptions() {
  return {}
}

// ── Node.js runtime path ──────────────────────────────────────────────────────
function resolveNodeRuntime() {
  return 'node'
}

// ── Linux build command ───────────────────────────────────────────────────────
// On Linux the AppImage runs natively — no WSL bridge required.
function _quoteBash(s) {
  return `'${String(s || '').replace(/'/g, `'"'"'`)}'`
}

function rewriteLinuxBuildCommand(cwd) {
  const script = [
    'set -euo pipefail',
    `cd ${_quoteBash(cwd)}`,
    'npm install',
    'if npm run | grep -q "build:linux"; then npm run build:linux; else npx electron-builder --linux AppImage --x64 --publish never; fi'
  ].join('; ')
  return {
    cmd: 'bash',
    args: ['-lc', script],
    rewriteInfo: {
      applied: true,
      kind: 'launcher-linux-build-inline-bash',
      targetProjectPath: cwd
    }
  }
}

// ── Protected OS path bases ───────────────────────────────────────────────────
// Base list covers standard FHS paths.
// We also scan /proc/mounts at runtime to catch non-standard system-level
// mount points (e.g. bind mounts, external drives at /mnt/*, /media/*,
// or custom rootfs at depth-1 like /data, /storage).
// Only "system-ish" mounts are protected — /home and /tmp are intentionally left open.

const _OPEN_ROOTS = new Set(['home', 'tmp', 'root'])

function _readMountRoots() {
  try {
    const fs = require('fs')
    const lines = fs.readFileSync('/proc/mounts', 'utf8').split('\n')
    const extra = new Set()
    for (const line of lines) {
      const mountPoint = line.split(' ')[1]
      if (!mountPoint || mountPoint === '/') continue
      const parts = mountPoint.split('/').filter(Boolean)
      // Protect any depth-1 non-user mount (e.g. /data, /storage)
      if (parts.length === 1 && !_OPEN_ROOTS.has(parts[0])) {
        extra.add(mountPoint)
      }
      // Protect anything under /mnt/* or /media/* (external drives, images)
      if (parts.length === 2 && (parts[0] === 'mnt' || parts[0] === 'media')) {
        extra.add(mountPoint)
      }
    }
    return [...extra]
  } catch {
    return []
  }
}

function getProtectedPathBases() {
  return [
    '/bin', '/sbin', '/lib', '/lib64',
    '/usr', '/var', '/etc', '/boot',
    '/proc', '/sys', '/dev', '/run', '/snap',
    ..._readMountRoots()
  ]
}

module.exports = {
  PLATFORM,
  getWritableCandidates,
  normalizeExecName,
  shouldUseShell,
  buildShellSpawn,
  getPtySpawnOptions,
  resolveNodeRuntime,
  rewriteLinuxBuildCommand,
  getProtectedPathBases
}