'use strict'
/**
 * platform-win32.js — Windows-specific runtime adapter
 * Loaded exclusively when process.platform === 'win32'
 */

const path = require('path')
const os = require('os')
const { spawnSync } = require('child_process')

const PLATFORM = 'win32'

// ── Writable path candidates for app userData ─────────────────────────────────
function getWritableCandidates(appDirName) {
  const candidates = []
  const localAppData = process.env.LOCALAPPDATA
  if (localAppData) {
    candidates.push(path.join(localAppData, 'Chahuadev', appDirName))
  }
  candidates.push(path.join(os.tmpdir(), appDirName))
  return candidates
}

// ── Command name normalization ────────────────────────────────────────────────
// Windows requires .cmd suffix for package manager shims in PATH.
function normalizeExecName(cmd) {
  const c = String(cmd || '').trim()
  if (!c) return c
  const lc = c.toLowerCase()
  if (lc === 'npm')  return 'npm.cmd'
  if (lc === 'npx')  return 'npx.cmd'
  if (lc === 'pnpm') return 'pnpm.cmd'
  if (lc === 'yarn') return 'yarn.cmd'
  return c
}

// ── Shell wrapping (for .bat / .cmd files) ────────────────────────────────────
function shouldUseShell(cmd) {
  const c = String(cmd || '').toLowerCase()
  return c.endsWith('.bat') || c.endsWith('.cmd')
}

function quoteArg(arg) {
  const s = String(arg || '')
  if (!s) return '""'
  if (!/[\s"]/g.test(s)) return s
  return `"${s.replace(/(\\*)"/g, '$1$1\\"').replace(/(\\+)$/g, '$1$1')}"`
}

function buildCmdLine(cmd, args) {
  return [cmd, ...(args || [])].map(quoteArg).join(' ')
}

// Returns { file, args } ready for node-pty.spawn()
function buildShellSpawn(cmd, args) {
  const comspec = process.env.COMSPEC || 'cmd.exe'
  return {
    file: comspec,
    args: ['/d', '/s', '/c', buildCmdLine(cmd, args)]
  }
}

// ── node-pty spawn extra options ──────────────────────────────────────────────
// useConpty enables Windows 10+ ConPTY backend — required on Windows for
// proper ANSI colour support in cmd.exe / PowerShell.
function getPtySpawnOptions() {
  return { useConpty: true }
}

// ── Node.js runtime path ──────────────────────────────────────────────────────
function resolveNodeRuntime() {
  try {
    const r = spawnSync('where', ['node'], {
      windowsHide: true,
      encoding: 'utf8',
      shell: false
    })
    if ((r.status ?? 1) === 0) {
      const first = String(r.stdout || '')
        .split(/\r?\n/)
        .map(x => x.trim())
        .find(Boolean)
      if (first) return first
    }
  } catch (_e) { /* where.exe failed or node not found; fall through to default */ }
  return 'node.exe'
}

// ── Linux build command rewrite (via WSL) ─────────────────────────────────────
function _quoteBash(s) {
  return `'${String(s || '').replace(/'/g, `'"'"'`)}'`
}

function windowsPathToWsl(inputPath) {
  const raw = String(inputPath || '')
  const win = raw.replace(/\//g, '\\')
  const m = win.match(/^([a-zA-Z]):\\(.*)$/)
  if (!m) return raw.replace(/\\/g, '/')
  const drive = String(m[1] || '').toLowerCase()
  const tail  = String(m[2] || '').replace(/\\/g, '/')
  return `/mnt/${drive}/${tail}`
}

function rewriteLinuxBuildCommand(cwd) {
  const wslTarget = windowsPathToWsl(cwd)
  const script = [
    'set -euo pipefail',
    `cd ${_quoteBash(wslTarget)}`,
    '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: 'wsl.exe',
    args: ['bash', '-lc', script],
    rewriteInfo: {
      applied: true,
      kind: 'launcher-linux-build-inline-wsl',
      targetProjectPath: cwd
    }
  }
}

// ── Protected OS path bases ───────────────────────────────────────────────────
function getProtectedPathBases() {
  const homeDir = os.homedir()
  const systemDrive = String(process.env.SystemDrive || 'C:').toUpperCase()
  const driveRoot = `${systemDrive}\\`
  return [
    path.join(driveRoot, 'Windows'),
    path.join(driveRoot, 'Program Files'),
    path.join(driveRoot, 'Program Files (x86)'),
    path.join(driveRoot, 'ProgramData'),
    path.join(driveRoot, 'Users'),
    path.join(driveRoot, 'PerfLogs'),
    path.join(driveRoot, 'Recovery'),
    path.join(driveRoot, 'System Volume Information'),
    path.join(driveRoot, '$Recycle.Bin'),
    path.join(homeDir, 'AppData'),
    path.join(homeDir, 'Local Settings')
  ]
}

module.exports = {
  PLATFORM,
  getWritableCandidates,
  normalizeExecName,
  shouldUseShell,
  buildShellSpawn,
  getPtySpawnOptions,
  resolveNodeRuntime,
  rewriteLinuxBuildCommand,
  getProtectedPathBases,
  // Exported for tests / diagnostics
  windowsPathToWsl,
  quoteArg,
  buildCmdLine
}