import { Request, Response, NextFunction } from 'express';
import Joi from 'joi';
import { AppError } from '../utils/AppError';

export const validate = (schema: Joi.ObjectSchema) => {
  return (req: Request, res: Response, next: NextFunction): void => {
    const { error } = schema.validate(req.body, { abortEarly: false });
    
    if (error) {
      const errorMessage = error.details.map(detail => detail.message).join(', ');
      return next(new AppError(errorMessage, 400));
    }
    
    next();
  };
};

// Common validation schemas
export const registerSchema = Joi.object({
  username: Joi.string()
    .min(3)
    .max(30)
    .required()
    .messages({
      'string.min': 'Username must be at least 3 characters long',
      'string.max': 'Username cannot exceed 30 characters',
      'any.required': 'Username is required'
    }),
  email: Joi.string()
    .email()
    .required()
    .messages({
      'string.email': 'Please provide a valid email address',
      'any.required': 'Email is required'
    }),
  password: Joi.string()
    .min(8)
    .pattern(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{8,}$/)
    .required()
    .messages({
      'string.min': 'Password must be at least 8 characters long',
      'string.pattern.base': 'Password must contain at least one lowercase letter, one uppercase letter, one number, and one special character',
      'any.required': 'Password is required'
    })
});

export const loginSchema = Joi.object({
  email: Joi.string()
    .email()
    .required()
    .messages({
      'string.email': 'Please provide a valid email address',
      'any.required': 'Email is required'
    }),
  password: Joi.string()
    .required()
    .messages({
      'any.required': 'Password is required'
    })
});

export const forgotPasswordSchema = Joi.object({
  email: Joi.string()
    .email()
    .required()
    .messages({
      'string.email': 'Please provide a valid email address',
      'any.required': 'Email is required'
    })
});

export const resetPasswordSchema = Joi.object({
  token: Joi.string()
    .required()
    .messages({
      'any.required': 'Reset token is required'
    }),
  newPassword: Joi.string()
    .min(8)
    .pattern(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[\W_]).{8,}$/)
    .required()
    .messages({
      'string.min': 'Password must be at least 8 characters long',
      'string.pattern.base': 'Password must contain at least one lowercase letter, one uppercase letter, one number, and one special character',
      'any.required': 'New password is required'
    })
});