// Copyright (c) 2025 Nikolai Papin
//
// This file is part of Easywish
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
// the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package validation

import (
	"easywish/config"
	"regexp"

	"github.com/go-playground/validator/v10"
)

type CustomValidatorHandler struct {
	Function func(fl validator.FieldLevel) bool
	FieldName string
}

func GetCustomHandlers() []CustomValidatorHandler {

	handlers := []CustomValidatorHandler{

		{
			FieldName: "username",
			Function: func(fl validator.FieldLevel) bool {
				username := fl.Field().String()
        return regexp.MustCompile(`^[a-zA-Z0-9_]{3,20}$`).MatchString(username)
		}},

		{
			FieldName: "name",
			Function: func(fl validator.FieldLevel) bool {
				username := fl.Field().String()
        return regexp.MustCompile(`^.{1,75}$`).MatchString(username)
		}},

		{
			FieldName: "password",
			Function: func(fl validator.FieldLevel) bool {
				password := fl.Field().String()
				cfg := config.GetConfig()

				if cfg.PasswordMaxLength < len(password) || len(password) < cfg.PasswordMinLength {
					return false
				}

				if cfg.PasswordCheckNumbers && !regexp.MustCompile(`\d+`).MatchString(password) {
					return false
				}

				if cfg.PasswordCheckCases && !regexp.MustCompile(`^(?=.*[a-z])(?=.*[A-Z]).*$`).MatchString(password) ||
					cfg.PasswordCheckCharacters && !regexp.MustCompile(`[a-zA-Z]`).MatchString(password) {
						return false
				}

				if cfg.PasswordCheckSymbols && !regexp.MustCompile(`[.,/;'[\]\-=_+{}:"<>?\/|!@#$%^&*()~]`).MatchString(password) {
						return false
				}

				if cfg.PasswordCheckLeaked {
					// TODO: implement rockme check
				}

				return true
		}},
		
	} 

	return handlers
}