/*
ScheduleTogether Backend
Copyright (C) 2024, Marco Vitchi Thulin

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation.

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 Affero General Public License version 3 for more details.

This program incorporates external libraries for certain functionalities.
These libraries are covered by their respective licenses, and their usage
agreements are as outlined in their respective documentation or source
code.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package accounts

import (
	"github.com/kataras/iris/v12"

	db "git.zervo.org/scheduletogether/backend/internal/database"
	"git.zervo.org/scheduletogether/backend/pkg/helpers/cryptography"
	"git.zervo.org/scheduletogether/backend/pkg/types"
)

// AccountRegister_Service registers a new user
func AccountRegister_Service(ctx iris.Context, req types.AccountRegisterRequest) {
	// Validate user properties
	err := validateUserProperties(ctx, req)
	if err != nil {
		return
	}

	// Hash password
	hashedPassword, err := cryptography.HashString(req.Password)
	if err != nil {
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "An error occured while registering your account, please try again later",
		})
		logboi.Warn("Failed to hash password: " + err.Error())
		return
	}

	// Generate uuid
	userid, err := generateUUID()
	if err != nil {
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "An error occured while registering your account, please try again later",
		})
		logboi.Warn("Failed to generate UUID: " + err.Error())
		return
	}

	// Create new user record in database
	newUser := db.User{
		FirstName: req.FirstName,
		LastName:  req.LastName,
		Email:     req.Email,
		Username:  req.Username,
		Role:      "user", // TODO: implement proper roles?
		Uuid:      userid,
		Hash:      string(hashedPassword),
		Verified:  false,
	}

	// Start a transaction
	tx := db.Db.Begin()

	err = tx.Create(&newUser).Error
	if err != nil {
		tx.Rollback()
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "An error occured while registering your account, please try again later",
		})
		logboi.Warn("An error occured while creating account in database: " + err.Error())
		return
	}

	// Generate token
	token, err := cryptography.GenerateToken(7)
	if err != nil {
		tx.Rollback()
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "An error occured while registering your account, please try again later",
		})
		logboi.Warn("Failed to generate token: " + err.Error())
		return
	}

	// Create verification req record in database
	newVerify := db.RegisterVerification{
		Uuid:  userid,
		Token: token,
	}

	err = tx.Create(&newVerify).Error
	if err != nil {
		tx.Rollback()
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "An error occured while registering your account, please try again later",
		})
		logboi.Warn("An error occured while adding account verification req to database: " + err.Error())
		return
	}

	// TODO: Send verification email thingy

	// Commit the transaction if everything is successful
	err = tx.Commit().Error
	if err != nil {
		tx.Rollback()
		ctx.StatusCode(iris.StatusInternalServerError)
		ctx.JSON(types.CommonErrorResponse{
			Error: "Something went wrong, please try again later",
		})
		return
	}

	logboi.Info("Registered new user! Username: " + req.Username + ", Verification token: " + token)

	ctx.JSON(types.AccountRegisterResponse{
		Message:    "User registered successfully",
		Uuid:       newUser.Uuid,
		MustVerify: true,
	})
}