import 'dotenv/config'
import express from 'express'
import cookieParser from 'cookie-parser'
import path from 'path'
import { fileURLToPath } from 'url'

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)
const app = express()
const PORT = process.env.PORT || 3000

// Middleware
app.use(express.json({ limit: '10mb' }))
app.use(express.urlencoded({ extended: true }))
app.use(cookieParser())

// Wrap handler to catch errors and merge params
function wrapHandler(handler: Function) {
  return async (req: any, res: any, next: any) => {
    const mergedQuery = { ...req.query, ...req.params }
    Object.defineProperty(req, 'query', {
      value: mergedQuery,
      writable: true,
      configurable: true,
    })
    try {
      await handler(req, res)
    } catch (error) {
      next(error)
    }
  }
}

async function setupRoutes() {
  // Quest API (Mini App)
  const questCurrent = (await import('../api/quest/current.js')).default
  const questEvents = (await import('../api/quest/events.js')).default
  const questHistory = (await import('../api/quest/history.js')).default

  // Internal API (Bot)
  const botInternal = (await import('../api/bot/internal.js')).default

  // Quest routes (Mini App)
  app.all('/api/quest/current', wrapHandler(questCurrent))
  app.all('/api/quest/events', wrapHandler(questEvents))
  app.all('/api/quest/history', wrapHandler(questHistory))
  app.all('/api/quest/history/:id', wrapHandler(questHistory))

  // Internal bot routes
  app.all('/api/bot/internal', wrapHandler(botInternal))

  // In production: start bot in webhook mode inside this server process
  const isProduction = process.env.NODE_ENV === 'production' && process.env.BOT_WEBHOOK_URL
  if (isProduction) {
    const { webhookCallback } = await import('grammy')
    const { createBot } = await import('../bot/bot.js')
    const { startEventProcessor } = await import('../bot/services/event-processor.js')

    const token = process.env.TELEGRAM_BOT_TOKEN
    if (!token) {
      console.error('TELEGRAM_BOT_TOKEN is not set!')
      process.exit(1)
    }

    const bot = createBot(token)
    await bot.init()

    // Register grammY webhook handler
    app.post('/api/telegram/webhook', webhookCallback(bot, 'express'))

    // Set webhook with Telegram
    await bot.api.setWebhook(process.env.BOT_WEBHOOK_URL!, {
      secret_token: process.env.BOT_WEBHOOK_SECRET,
    })

    // Start event processing loop
    startEventProcessor(bot)

    console.log('Bot started in webhook mode')
  } else {
    // In development: register a placeholder webhook route
    const telegramWebhook = (await import('../api/telegram/webhook.js')).default
    app.all('/api/telegram/webhook', wrapHandler(telegramWebhook))
  }

  // Serve static files from dist/ in production
  const distPath = path.join(__dirname, '..', '..', 'dist')
  app.use(express.static(distPath))

  // SPA fallback
  app.use((req: any, res: any, next: any) => {
    if (req.path.startsWith('/api/')) {
      return next()
    }
    res.sendFile(path.join(distPath, 'index.html'))
  })
}

// Error handler
app.use((err: any, _req: any, res: any, _next: any) => {
  console.error('Server error:', err)
  res.status(500).json({ error: 'Internal server error' })
})

async function start() {
  try {
    await setupRoutes()
    app.listen(PORT, () => {
      console.log(`Guidly server running on http://localhost:${PORT}`)
    })
  } catch (error) {
    console.error('Failed to start server:', error)
    process.exit(1)
  }
}

start()