'use strict'

const path = require('path')
const fs = require('fs')

// Packaged builds run from <portable root>/olcxja.plwl/resources/app.asar:
// the portable layout (<root>/files) is two levels above the resources dir
// and files bundled with the release are unpacked next to the asar.
function computeRoots() {
  const m = __dirname.match(/^(.*)[/\\]app\.asar([/\\]|$)/)
  if (m) {
    const RESOURCES = path.resolve(m[1])
    const APP_ROOT = path.resolve(RESOURCES, '..', '..')
    return {
      RESOURCES,
      APP_ROOT,
      // FILES = BUILD/files, so BUILD is the portable root itself.
      BUILD: process.env.PLWL_BUILD_DIR || APP_ROOT,
      // Bundled release files live inside the asar (Electron's patched fs
      // can read them directly from the archive).
      BUNDLED: fs.existsSync(path.join(RESOURCES, 'app.asar', 'files', 'translations'))
        ? path.join(RESOURCES, 'app.asar', 'files')
        : path.join(APP_ROOT, 'files')
    }
  }
  const APP_ROOT = path.resolve(__dirname, '..')
  return {
    RESOURCES: APP_ROOT,
    APP_ROOT,
    BUILD: process.env.PLWL_BUILD_DIR || path.join(APP_ROOT, 'build'),
    BUNDLED: path.join(APP_ROOT, 'files')
  }
}

const { RESOURCES, APP_ROOT, BUILD, BUNDLED } = computeRoots()

const FILES = path.join(BUILD, 'files')
const DATA = path.join(FILES, 'data')

const DIRS = {
  BUILD,
  APP_ROOT,
  FILES,
  DATA,
  WINES: path.join(FILES, 'wines'),
  PREFIXES: path.join(FILES, 'wineprefixes'),
  APPS: path.join(FILES, 'apps'),
  TRANSLATIONS: path.join(FILES, 'translations'),
  BUNDLED_TRANSLATIONS: path.join(BUNDLED, 'translations'),
  FAKE_STEAM: path.join(DATA, 'fake-steam')
}

// Bundled translation files are launcher-owned: on every start they are
// refreshed in the portable files/translations folder WHENEVER THEIR CONTENT
// CHANGED, so an update shipping new or changed keys reaches existing
// installs too (the old copy-only-if-missing logic froze translations at the
// version that happened to run first). Extra files in the target folder that
// the bundle does not ship (user-added languages) are left untouched.
function filesDiffer(a, b) {
  try {
    return !fs.readFileSync(a).equals(fs.readFileSync(b))
  } catch {
    return true // target missing/unreadable -> needs a (re)copy
  }
}

function syncBundledTranslations(bundledDir, targetDir) {
  let names = []
  try {
    names = fs.readdirSync(bundledDir)
  } catch {
    return 0
  }
  let updated = 0
  for (const name of names) {
    const src = path.join(bundledDir, name)
    const dst = path.join(targetDir, name)
    try {
      if (!fs.statSync(src).isFile()) continue
    } catch {
      continue
    }
    if (!filesDiffer(src, dst)) continue
    try {
      fs.copyFileSync(src, dst)
      updated++
    } catch {}
  }
  return updated
}

function ensureDirs() {
  for (const dir of [FILES, DATA, DIRS.WINES, DIRS.PREFIXES, DIRS.APPS, DIRS.TRANSLATIONS, DIRS.FAKE_STEAM]) {
    fs.mkdirSync(dir, { recursive: true })
  }
  if (DIRS.TRANSLATIONS !== DIRS.BUNDLED_TRANSLATIONS) {
    syncBundledTranslations(DIRS.BUNDLED_TRANSLATIONS, DIRS.TRANSLATIONS)
  }
}

// Portable paths: anything stored under FILES/ goes into the registry as a
// path RELATIVE to FILES (e.g. apps/<id>/game.exe), so moving the whole
// launcher folder keeps the library working. Absolute paths outside FILES
// (games left in place) are stored as-is. Resolve on read, normalize on write.
function toPortablePath(p) {
  if (typeof p !== 'string' || !p || !path.isAbsolute(p)) return p
  const rel = path.relative(FILES, p)
  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return p
  return rel
}

function resolvePortablePath(p) {
  if (typeof p !== 'string' || !p || path.isAbsolute(p)) return p
  return path.join(FILES, p)
}

// The launcher's own icon (renderer/plwl.png), used by the tray, the app
// icon and as the .desktop shortcut fallback.
//
// The module-relative copy comes FIRST: it is the only candidate that exists
// in every layout, because a packaged build keeps renderer/ inside
// app.asar and Electron's patched fs reads straight out of the archive (a
// release only ships olcxja.plwl.png next to the portable root, so looking at
// APP_ROOT alone made the tray icon vanish in installed builds). Cached: it
// never moves at runtime.
function launcherIconCandidates() {
  const bundled = path.join(__dirname, '..', 'renderer')
  return [
    path.join(bundled, 'plwl.png'),
    path.join(bundled, 'plwl.svg'),
    path.join(APP_ROOT, 'renderer', 'plwl.png'),
    path.join(APP_ROOT, 'renderer', 'plwl.svg'),
    path.join(APP_ROOT, 'olcxja.plwl.png')
  ]
}

function firstExisting(candidates) {
  for (const candidate of candidates) {
    try {
      if (fs.existsSync(candidate)) return candidate
    } catch {}
  }
  return null
}

let launcherIcon = null
function launcherIconPath() {
  if (launcherIcon === null) launcherIcon = firstExisting(launcherIconCandidates()) || ''
  return launcherIcon || null
}

// The same icon, but only as a real file on disk: a .desktop entry's Icon= is
// resolved by the desktop environment, which cannot look inside app.asar.
function launcherIconDiskPath() {
  const onDisk = launcherIconCandidates().filter(candidate => !candidate.includes(`.asar${path.sep}`))
  return firstExisting(onDisk)
}

function readJson(file, fallback) {
  try {
    return JSON.parse(fs.readFileSync(file, 'utf8'))
  } catch {
    return fallback
  }
}

function writeJson(file, data) {
  fs.mkdirSync(path.dirname(file), { recursive: true })
  const tmp = file + '.tmp'
  fs.writeFileSync(tmp, JSON.stringify(data, null, 2))
  fs.renameSync(tmp, file)
}

module.exports = { RESOURCES, APP_ROOT, BUILD, FILES, DATA, DIRS, ensureDirs, syncBundledTranslations, launcherIconPath, launcherIconDiskPath, readJson, writeJson, toPortablePath, resolvePortablePath }