/*
YetAnotherToDoList
Copyright © 2023 gilex-dev gilex-dev@proton.me

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, version 3.

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 <http://www.gnu.org/licenses/>.
*/
package database

import (
	"errors"
	"strconv"

	"somepi.ddns.net/gitea/gilex-dev/YetAnotherToDoList/graph/model"
)

func (db CustomDB) CreateRole(newRole *model.NewRole) (role *model.Role, err error) {
	statement, err := db.connection.Prepare("INSERT INTO Role (roleName, IS_admin, IS_userCreator) VALUES (?, ?, ?)")
	if err != nil {
		return nil, err
	}

	rows, err := statement.Exec(newRole.RoleName, newRole.IsAdmin, newRole.IsUserCreator)
	if err != nil {
		return nil, err
	}

	num, err := rows.RowsAffected()
	if err != nil {
		return nil, err
	}

	if num < 1 {
		return nil, errors.New("no rows affected")
	}

	insertId, err := rows.LastInsertId()
	if err != nil {
		return nil, err
	}
	return &model.Role{ID: strconv.FormatInt(insertId, 10), RoleName: newRole.RoleName, IsAdmin: newRole.IsAdmin, IsUserCreator: newRole.IsUserCreator}, nil
}

func (db CustomDB) GetRole(role *model.Role) (*model.Role, error) {
	id, err := strconv.Atoi(role.ID)
	if err != nil {
		return nil, errors.New("invalid roleId")
	}
	statement, err := db.connection.Prepare("SELECT roleName, IS_admin, IS_userCreator FROM Role WHERE roleId = ?")
	if err != nil {
		return nil, err
	}

	result := statement.QueryRow(id)
	if err := result.Scan(&role.RoleName, &role.IsAdmin, &role.IsUserCreator); err != nil {
		return nil, err
	}

	return role, nil
}

func (db CustomDB) GetRolesFrom(userId string) ([]*model.Role, error) {
	numUserId, err := strconv.Atoi(userId)
	if err != nil {
		return nil, errors.New("invalid userId")
	}
	statement, err := db.connection.Prepare("SELECT Role.roleId, Role.roleName, Role.IS_admin, Role.IS_userCreator FROM Role INNER JOIN R_User_Role ON R_User_Role.FK_Role_roleId = Role.roleId WHERE R_User_Role.FK_User_userId = ?")
	if err != nil {
		return nil, err
	}

	rows, err := statement.Query(numUserId)
	if err != nil {
		return nil, err
	}

	defer rows.Close()

	var all []*model.Role
	for rows.Next() {
		role := model.Role{}
		if err := rows.Scan(&role.ID, &role.RoleName, &role.IsAdmin, &role.IsUserCreator); err != nil {
			return nil, err
		}
		all = append(all, &role)
	}
	return all, nil
}

func (db CustomDB) GetAllRoles() ([]*model.Role, error) {
	rows, err := db.connection.Query("SELECT roleId, roleName, IS_admin, IS_userCreator FROM Role")
	if err != nil {
		return nil, err
	}

	defer rows.Close()

	var all []*model.Role
	for rows.Next() {
		var role model.Role
		if err := rows.Scan(&role.ID, &role.RoleName, &role.IsAdmin, &role.IsUserCreator); err != nil {
			return nil, err
		}
		all = append(all, &role)
	}
	return all, nil
}

func (db CustomDB) UpdateRole(roleId string, changes *model.UpdateRole) (*model.Role, error) {

	id, err := strconv.Atoi(roleId)
	if err != nil {
		return nil, errors.New("invalid userId")
	}

	statement, err := db.connection.Prepare("UPDATE Role SET roleName = IFNULL(?, roleName), IS_admin = IFNULL(?, IS_admin), IS_userCreator = IFNULL(?, IS_userCreator) WHERE roleId = ?")
	if err != nil {
		return nil, err
	}

	rows, err := statement.Exec(changes.RoleName, changes.IsAdmin, changes.IsUserCreator, id)
	if err != nil {
		return nil, err
	}

	num, err := rows.RowsAffected()
	if err != nil {
		return nil, err
	}

	if num < 1 {
		return nil, errors.New("no rows affected")
	}

	return db.GetRole(&model.Role{ID: roleId})
}

func (db CustomDB) DeleteRole(roleId string) (*string, error) {
	statement, err := db.connection.Prepare("DELETE FROM Role WHERE roleId = ?")
	if err != nil {
		return nil, err
	}

	rows, err := statement.Exec(roleId)
	if err != nil {
		return nil, err
	}

	num, err := rows.RowsAffected()
	if err != nil {
		return nil, err
	}

	if num < 1 {
		return nil, errors.New("no rows affected")
	}

	return &roleId, nil
}