import type { Request, Response, NextFunction, Express } from 'express'
import { matchedData } from 'express-validator'
import { genJWT } from '../../utils/auth.js'
import { createUser, createGuestUser } from '../../models/userManager.js'
import { asyncHandler } from '../../middleware/error.js'
import logger from '../../utils/logger.js'

export const issueToken = asyncHandler(async (req: Request, res: Response) => {
  const user = req.user as Express.ExistingUser
  const token = await genJWT({
    _id: user.id,
    username: user.username,
    email: user.email,
  })
  res.json({ token })
})

export const register = asyncHandler(
  async (req: Request, res: Response, next: NextFunction) => {
    const { username, password, email } = matchedData(req)

    const user = await createUser(username, email, { password })
    req.login(
      {
        id: user.id,
        username: user.username,
        email: user.email,
      },
      (err) => {
        if (err) {
          next(err)
          return
        }
        res.status(201).json({
          message: 'user created',
        })
      }
    )
  }
)

export const registerGuest = asyncHandler(
  async (req: Request, res: Response) => {
    const user = await createGuestUser()
    req.login(
      {
        id: user.id,
        username: user.username,
        email: user.email,
      },
      (err) => {
        if (err) {
          res.status(500).json({
            message: 'error logging in',
          })
          return
        }
        res.status(201).json({
          message: 'user created',
        })
      }
    )
  }
)

export function logout(req: Request, res: Response) {
  req.logout((err) => {
    if (err) {
      logger.error(err)
      res.status(500).json({
        message: 'error logging out',
      })
      return
    }
    res.status(200).json({
      message: 'logged out',
    })
  })
}

export function checkSession(req: Request, res: Response) {
  res.json({
    loggedIn: req.isAuthenticated() && !req.session.newUser,
  })
}

export function socialLoginHandler(req: Request, res: Response) {
  const { newUser } = req.user as Express.NewUser
  if (newUser) {
    req.session.newUser = newUser
    res.redirect('/choose-username')
    return
  }
  res.redirect('/map')
}

export const registerFromSession = asyncHandler(
  async (req: Request, res: Response, next: NextFunction) => {
    const { username } = matchedData(req)
    const { newUser } = req.session

    if (!newUser) {
      res.status(401).json({
        message: 'no new user found',
      })
      return
    }

    const { email, socialLogin } = newUser

    if (!socialLogin) {
      throw new Error('Socail Login not found')
    }

    const user = await createUser(username, email, { socialLogin })

    req.login(
      {
        id: user.id,
        username: user.username,
        email: user.email,
      },
      (err) => {
        if (err) {
          next(err)
          return
        }
        delete req.session.newUser
        res.status(201).json({
          message: 'user created',
        })
      }
    )
  }
)