import fs from 'fs'
import { createServer as httpServer, Server as HTTPServer } from 'http'
import { pathToFileURL } from 'url'

import cors from 'cors'
import express, { Application } from 'express'
import { Server as SocketServer } from 'socket.io'

import config from '#application/config'
import Database from '#application/database'
import Logger, { LoggerType } from '#application/logger'
import { getAppPath } from '#application/storage'
import { TSocket } from '#application/types'
import ConsoleManager from '#managers/consoleManager'
import DateManager from '#managers/dateManager'
import HttpManager from '#managers/httpManager'
import QueueManager from '#managers/queueManager'
import UserManager from '#managers/userManager'
import WeatherManager from '#managers/weatherManager'
import ZoneManager from '#managers/zoneManager'
import { Authentication } from '#middleware/authentication'

export class Server {
  private readonly app: Application
  private readonly http: HTTPServer
  private readonly io: SocketServer
  private readonly logger = Logger.type(LoggerType.APP)

  /**
   * Creates an instance of GameServer.
   */
  constructor() {
    this.app = express()
    this.app.use(
      cors({
        origin: config.CLIENT_URL,
        methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'], // Add supported methods
        allowedHeaders: ['Content-Type', 'Authorization'], // Add allowed headers
        credentials: true
      })
    )
    this.app.use(express.json())
    this.app.use(express.urlencoded({ extended: true }))
    this.http = httpServer(this.app)
    this.io = new SocketServer(this.http)
    this.io.use(Authentication)
  }

  /**
   * Start the server
   */
  public async start() {
    // Connect to database
    try {
      await Database.initialize()
    } catch (error: any) {
      this.logger.error(`Database connection failed: ${error.message}`)
      process.exit(1) // Exit if database connection fails
    }

    // Start the server
    try {
      this.http.listen(config.PORT, config.HOST)
      this.logger.info(`Socket.IO running on port ${config.PORT}`)
    } catch (error: any) {
      this.logger.error(`Socket.IO failed to start: ${error.message}`)
    }

    // Load HTTP manager
    await HttpManager.boot(this.app)

    // Load queue manager
    await QueueManager.boot(this.io)

    // Load user manager
    await UserManager.boot()

    // Load date manager
    // await DateManager.boot(this.io)

    // Load weather manager
    // await WeatherManager.boot(this.io)

    // Load zoneEditor manager
    await ZoneManager.boot()

    // Load console manager
    await ConsoleManager.boot(this.io)

    // Listen for socket connections
    this.io.on('connection', this.handleConnection.bind(this))
  }

  /**
   * Handle socket connection
   * @param socket
   * @private
   */
  private async handleConnection(socket: TSocket) {
    try {
      await this.loadEventHandlers('events', '', socket)
    } catch (error: any) {
      this.logger.error(`Failed to load event handlers: ${error.message}`)
    }
  }

  private async loadEventHandlers(baseDir: string, subDir: string, socket: TSocket) {
    try {
      const fullDir = getAppPath(baseDir, subDir)
      const files = await fs.promises.readdir(fullDir, { withFileTypes: true })

      for (const file of files) {
        const filePath = getAppPath(baseDir, subDir, file.name)

        if (file.isDirectory()) {
          await this.loadEventHandlers(baseDir, `${subDir}/${file.name}`, socket)
          continue
        }

        if (!file.isFile() || (!file.name.endsWith('.ts') && !file.name.endsWith('.js'))) {
          continue
        }

        try {
          const module = await import(pathToFileURL(filePath).href)
          if (typeof module.default !== 'function') {
            this.logger.warn(`Unrecognized export in ${file.name}`)
            continue
          }

          const EventClass = module.default
          const eventInstance = new EventClass(this.io, socket)
          eventInstance.listen()
        } catch (error) {
          this.logger.error(`Error loading event handler ${file.name}: ${error instanceof Error ? error.message : String(error)}`)
        }
      }
    } catch (error) {
      this.logger.error(`Error reading directory: ${error instanceof Error ? error.message : String(error)}`)
    }
  }
}

// Start the server
const server = new Server()
server.start()