import type { NextFunction, Request, Response } from 'express'
import { ZodError } from 'zod'
import { AppError } from '../lib/errors.js'
import { logger } from '../lib/logger.js'

export const errorHandler = (error: unknown, _req: Request, res: Response, _next: NextFunction) => {
  if (error instanceof AppError) {
    res.status(error.statusCode).json({ error: { code: error.code, message: error.message } })
    return
  }
  if (error instanceof ZodError) {
    res.status(400).json({
      error: {
        code: 'VALIDATION_ERROR',
        message: error.issues.map((issue) => issue.message).join(', '),
      },
    })
    return
  }
  logger.error('Unhandled error', error)
  res.status(500).json({ error: { code: 'INTERNAL', message: 'Something went wrong' } })
}