import fs from 'fs'
import express, { Application } from 'express'
import config from './utilities/config'
import { getAppPath } from './utilities/storage'
import { createServer as httpServer, Server as HTTPServer } from 'http'
import { addHttpRoutes } from './utilities/http'
import cors from 'cors'
import { Server as SocketServer } from 'socket.io'
import { Authentication } from './middleware/authentication'
import { TSocket } from './utilities/types'
import prisma from './utilities/prisma'
import { appLogger, watchLogs } from './utilities/logger'
import ZoneManager from './managers/zoneManager'
import UserManager from './managers/userManager'
import CommandManager from './managers/commandManager'
import CharacterManager from './managers/characterManager'
import QueueManager from './managers/queueManager'
import DateManager from './managers/dateManager'

export class Server {
  private readonly app: Application
  private readonly http: HTTPServer
  private readonly io: SocketServer

  /**
   * Creates an instance of GameServer.
   */
  constructor() {
    this.app = express()
    this.app.use(cors())
    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() {
    // Read log file and print to console for debugging
    watchLogs()

    // Check prisma connection
    try {
      await prisma.$connect()
      appLogger.info('Database connected')
    } catch (error: any) {
      appLogger.error(`Database connection failed: ${error.message}`)
    }

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

    // Add http API routes
    await addHttpRoutes(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 zoneEditor manager
    await ZoneManager.boot()

    // Load character manager
    await CharacterManager.boot()

    // Load command manager
    await CommandManager.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('socketEvents', '', socket)
    } catch (error: any) {
      appLogger.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(filePath)
          if (typeof module.default !== 'function') {
            appLogger.warn(`Unrecognized export in ${file.name}`)
            continue
          }

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

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

appLogger.info('Server started')