const { body, param, query, validationResult } = require("express-validator");

// Validation error handler
const handleValidationErrors = (req, res, next) => {
	const errors = validationResult(req);
	if (!errors.isEmpty()) {
		return res.status(400).json({
			success: false,
			message: "Validation failed",
			errors: errors.array().map((error) => ({
				field: error.path,
				message: error.msg,
				value: error.value,
			})),
		});
	}
	next();
};

// Password validation
const passwordValidation = body("password")
	.isLength({ min: 8 })
	.withMessage("Password must be at least 8 characters long")
	.matches(/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]/)
	.withMessage(
		"Password must contain at least one lowercase letter, one uppercase letter, one number, and one special character"
	);

// Email validation
const emailValidation = body("email")
	.isEmail()
	.withMessage("Please provide a valid email address")
	.normalizeEmail()
	.isLength({ max: 255 })
	.withMessage("Email address is too long");

// Registration validation
const validateRegistration = [
	emailValidation,
	passwordValidation,
	body("first_name")
		.optional()
		.trim()
		.isLength({ min: 1, max: 100 })
		.withMessage("First name must be between 1 and 100 characters"),
	body("last_name")
		.optional()
		.trim()
		.isLength({ min: 1, max: 100 })
		.withMessage("Last name must be between 1 and 100 characters"),
	handleValidationErrors,
];

// Login validation
const validateLogin = [
	body("email")
		.isEmail()
		.withMessage("Please provide a valid email address")
		.normalizeEmail(),
	body("password").notEmpty().withMessage("Password is required"),
	handleValidationErrors,
];

// Forgot password validation
const validateForgotPassword = [emailValidation, handleValidationErrors];

// Reset password validation
const validateResetPassword = [
	body("token")
		.notEmpty()
		.withMessage("Reset token is required")
		.isLength({ min: 64, max: 64 })
		.withMessage("Invalid reset token format"),
	passwordValidation,
	body("confirmPassword").custom((value, { req }) => {
		if (value !== req.body.password) {
			throw new Error("Password confirmation does not match password");
		}
		return true;
	}),
	handleValidationErrors,
];

// Profile update validation
const validateProfileUpdate = [
	body("first_name")
		.optional()
		.trim()
		.isLength({ min: 1, max: 100 })
		.withMessage("First name must be between 1 and 100 characters"),
	body("last_name")
		.optional()
		.trim()
		.isLength({ min: 1, max: 100 })
		.withMessage("Last name must be between 1 and 100 characters"),
	body("email")
		.optional()
		.isEmail()
		.withMessage("Please provide a valid email address")
		.normalizeEmail()
		.isLength({ max: 255 })
		.withMessage("Email address is too long"),
	handleValidationErrors,
];

module.exports = {
	validateRegistration,
	validateLogin,
	validateForgotPassword,
	validateResetPassword,
	validateProfileUpdate,
	handleValidationErrors,
	passwordValidation,
	emailValidation,
};