'use strict'

const { app } = require('electron')
const { ensureDirs, DIRS } = require('./paths')
const i18n = require('./i18n')
const wines = require('./wines')
const { registerIpc, sendToWindow } = require('./ipc')
const { createMainWindow } = require('./window')
const { setAppIcon } = require('./appicon')
const { parseArgv } = require('./argv')
const openwith = require('./openwith')
const lansync = require('./lansync')
const path = require('path')
const fs = require('fs')

app.setName('PLWL')

// The launcher keeps running with only a tray icon, so closing the window
// must not quit the app (playtime keeps counting while a game runs).
app.on('window-all-closed', e => {
  // no-op on purpose: tray Quit / menu Quit is the way out
})

let win = null
let tray = null
let quitting = false
let headless = false // started via --launch: no window until the user asks
let autoLaunchId = null // game id from --launch <id>
let autoOpenPath = null // file path from --open ("Open with PLWL")
let autoQuitWhenDone = false // headless boot: quit after that game exits
const getWindow = () => win

// --- single instance ---------------------------------------------------------
// Diagnostics: the shortcut handoff path is invisible otherwise (a failing
// handoff just "does nothing" for the user). Everything lands in a small
// trace file next to the launcher data so problems are reproducible.
function trace(msg) {
  try {
    const file = path.join(DIRS.DATA, 'instance-trace.log')
    // keep the trace tiny: drop it once it grows past ~64 KiB
    try {
      if (fs.existsSync(file) && fs.statSync(file).size > 64 * 1024) fs.rmSync(file, { force: true })
    } catch {}
    fs.appendFileSync(file, `${new Date().toISOString()} ${msg}\n`)
  } catch {}
}

// A second launcher invocation (e.g. a desktop shortcut with --launch <id>)
// hands its arguments to the running instance and exits immediately.
const gotLock = app.requestSingleInstanceLock()
trace(`boot argv=${process.argv.slice(1).join(' ')} gotLock=${gotLock}`)
if (!gotLock) {
  app.quit()
} else {
  app.on('second-instance', (e, argv) => {
    trace(`second-instance argv=${argv.join(' ')}`)
    const { launchId, openPath } = parseArgv(argv)
    lastHandoffAt = Date.now()
    if (openPath) openWith(openPath)
    else if (launchId) launchGame(launchId)
    else showMainWindow()
  })
}

// set on every second-instance handoff: the auto-quit check skips itself for
// a moment afterwards, so "one game exits" racing "a shortcut just started
// another game" can never kill the launcher mid-handoff
let lastHandoffAt = 0

// --- "Open with PLWL" (Exec %f from the file manager) --------------------------
// Hands the file to the window (renderer shows the wine/prefix picker popup);
// headless boots open the window for it - a file cannot be launched without
// the user choosing how.
async function openWith(filePath) {
  trace(`openWith ${filePath} serviceReady=${!!gamesService}`)
  showMainWindow()
  if (gamesService) gamesService.openExternally(filePath)
  else openwith.setPending(filePath)
}

const auto = parseArgv(process.argv)
autoLaunchId = auto.launchId
autoOpenPath = auto.openPath
headless = !!autoLaunchId
autoQuitWhenDone = headless // booting just to run one game -> exit when it ends

// --- tray ---------------------------------------------------------------------
// Lives as long as the app does: shows "active in background" even when the
// window is closed, and offers running games + Quit.
function trayIconPath() {
  return require('./paths').launcherIconPath() || undefined
}

function createTray() {
  const { Tray, Menu } = require('electron')
  const icon = trayIconPath()
  try {
    tray = new Tray(icon)
  } catch (err) {
    // never fatal (the window keeps working), but say why the icon is missing
    // instead of failing silently - a missing tray looks like a hung app when
    // the launcher runs in the background
    console.error(`[tray] could not create the tray icon (${icon || 'no icon file found'}): ${(err && err.message) || err}`)
    tray = null
    return
  }
  tray.setToolTip('PLWL')
  rebuildTrayMenu()
}

function rebuildTrayMenu() {
  if (!tray) return
  const { Menu } = require('electron')
  const lang = loadLangSafe()
  const gamesSvc = gamesService
  const running = gamesSvc ? gamesSvc.listRunning() : []
  const items = []

  items.push({
    label: i18n.translate(lang, 'tray.open'),
    click: () => showMainWindow()
  })

  if (running.length) {
    items.push({ type: 'separator' })
    items.push({ label: i18n.translate(lang, 'tray.running'), enabled: false })
    for (const id of running) {
      const game = require('./library').getGame(id)
      if (!game) continue
      items.push({
        label: `• ${game.name}`,
        click: () => {
          // click toggles: stop the running game
          gamesSvc.kill(id)
        }
      })
    }
  }

  items.push({ type: 'separator' })
  items.push({
    label: i18n.translate(lang, 'tray.quit'),
    click: () => {
      quitting = true
      app.quit()
    }
  })
  tray.setContextMenu(Menu.buildFromTemplate(items))
  const tip = running.length
    ? `PLWL - ${i18n.translate(lang, 'tray.tooltipRunning', running.length)}`
    : 'PLWL'
  tray.setToolTip(tip)
}

function loadLangSafe() {
  try {
    return require('./library').loadSettings().language || 'en-us'
  } catch {
    return 'en-us'
  }
}

function showMainWindow() {
  // the user is present now - headless auto-quit must never fire again
  headless = false
  autoQuitWhenDone = false
  if (gamesService) gamesService.setOnGameExit(null)
  if (win && !win.isDestroyed()) {
    win.show()
    win.focus()
    return
  }
  win = createMainWindow()
  wireWindow(win)
}

function wireWindow(w) {
  // closing the window hides it to the tray (playtime keeps counting in the
  // background) unless the user disabled that in settings - then it quits
  w.on('close', e => {
    if (quitting) return
    let closeToTray = true
    try {
      closeToTray = require('./library').loadSettings().closeToTray !== false
    } catch {}
    if (closeToTray) {
      e.preventDefault()
      w.hide()
    } else {
      quitting = true
      app.quit()
    }
  })
  w.on('closed', () => {
    win = null
  })
}

// --- game auto-launch (shortcuts) -----------------------------------------------
let gamesService = null

async function launchGame(id) {
  trace(`launchGame ${id} serviceReady=${!!gamesService}`)
  if (!gamesService) return
  const res = await gamesService.start(getWindow(), id)
  trace(`launchGame ${id} result=${JSON.stringify(res).slice(0, 200)}`)
  if (res.ok) {
    rebuildTrayMenu()
    // headless boot: when the auto-started game finishes and nothing else is
    // running, quit the launcher
    if (autoQuitWhenDone) {
      gamesService.setOnGameExit(() => {
        // fires for EVERY game exit; quit only when the last one just ended,
        // the user never opened the window and no shortcut handed a new game
        // over in the last few seconds (start/exit race guard)
        if (Date.now() - lastHandoffAt < 5000) return
        if (!gamesService.listRunning().length) {
          quitting = true
          app.quit()
        }
      })
    }
  } else if (headless && autoQuitWhenDone) {
    // nothing to run (bad shortcut target) -> do not linger in the tray
    quitting = true
    app.quit()
  }
}

app.whenReady().then(async () => {
  if (process.platform === 'linux') {
    try {
      setAppIcon(app)
    } catch {}
  }
  ensureDirs()
  await i18n.init()
  await wines.refreshWines()
  const { games } = registerIpc({ getWindow, onGamesChanged: rebuildTrayMenu })
  gamesService = games

  // the tray comes first: nothing (least of all the network) may keep it from
  // coming up - a launcher without a tray icon looks simply broken
  createTray()

  // LAN sync runs whenever the launcher runs - that is what makes this
  // device show up on the other machines' client lists
  const lanHooks = {
    onDevices: devices => sendToWindow(win, 'lansync:devices', devices),
    onApplied: info => sendToWindow(win, 'lansync:applied', info),
    onReceive: info => sendToWindow(win, 'lansync:receiving', info),
    isBusy: () => !!(gamesService && gamesService.listRunning().length)
  }
  try {
    Promise.resolve(lansync.start(lanHooks)).catch(err => {
      console.error(`[lansync] start failed: ${(err && err.message) || err}`)
    })
  } catch (err) {
    console.error(`[lansync] start failed: ${(err && err.message) || err}`)
  }
  if (headless) {
    // shortcut boot: run the game without opening the launcher window
    launchGame(autoLaunchId)
  } else {
    win = createMainWindow()
    wireWindow(win)
    // file open handed over while the service was still booting (or queued
    // by a second instance racing the first boot)
    if (autoOpenPath || openwith.hasPending()) {
      openWith(autoOpenPath || openwith.getPending())
    }
  }
})

app.on('before-quit', () => {
  quitting = true
  try {
    lansync.stop()
  } catch {}
})