package db

import (
	"errors"
	"strings"

	log "github.com/sirupsen/logrus"
	"github.com/synctv-org/synctv/internal/conf"
	"github.com/synctv-org/synctv/internal/model"
	"github.com/synctv-org/synctv/utils"

	// import fastjson serializer
	_ "github.com/synctv-org/synctv/utils/fastJSONSerializer"
	"gorm.io/gorm"
)

var (
	db     *gorm.DB
	dbType conf.DatabaseType
)

func Init(d *gorm.DB, t conf.DatabaseType) error {
	db = d
	dbType = t
	err := UpgradeDatabase()
	if err != nil {
		return err
	}
	err = initGuestUser()
	if err != nil {
		return err
	}
	return initRootUser()
}

func initRootUser() error {
	user := model.User{}
	err := db.Where("role = ?", model.RoleRoot).First(&user).Error
	if err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		return err
	}
	u, err := CreateUser("root", "root", WithRole(model.RoleRoot))
	log.Infof("init root user:\nid: %s\nusername: %s\npassword: %s", u.ID, u.Username, "root")
	return err
}

const (
	GuestUsername = "guest"
	GuestUserID   = "00000000000000000000000000000001"
)

func initGuestUser() error {
	user := model.User{
		ID: GuestUserID,
	}
	err := db.First(&user).Error
	if err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		return err
	}
	u, err := CreateUser("guest", utils.RandString(32), WithRole(model.RoleUser), WithID(GuestUserID))
	log.Infof("init guest user:\nid: %s\nusername: %s", u.ID, u.Username)
	return err
}

func DB() *gorm.DB {
	return db
}

func Close() {
	log.Info("closing db")
	sqlDB, err := db.DB()
	if err != nil {
		log.Errorf("failed to get db: %s", err.Error())
		return
	}
	err = sqlDB.Close()
	if err != nil {
		log.Errorf("failed to close db: %s", err.Error())
		return
	}
}

func Paginate(page, pageSize int) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		if page <= 0 {
			page = 1
		}
		if pageSize <= 0 {
			pageSize = 10
		}

		offset := (page - 1) * pageSize
		return db.Offset(offset).Limit(pageSize)
	}
}

func OrderByAsc(column string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Order(column + " asc")
	}
}

func OrderByDesc(column string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Order(column + " desc")
	}
}

func OrderByCreatedAtAsc(db *gorm.DB) *gorm.DB {
	return db.Order("created_at asc")
}

func OrderByUsersCreatedAtAsc(db *gorm.DB) *gorm.DB {
	return db.Order("users.created_at asc")
}

func OrderByCreatedAtDesc(db *gorm.DB) *gorm.DB {
	return db.Order("created_at desc")
}

func OrderByUsersCreatedAtDesc(db *gorm.DB) *gorm.DB {
	return db.Order("users.created_at desc")
}

func OrderByRoomCreatedAtAsc(db *gorm.DB) *gorm.DB {
	return db.Order("rooms.created_at asc")
}

func OrderByRoomCreatedAtDesc(db *gorm.DB) *gorm.DB {
	return db.Order("rooms.created_at desc")
}

func OrderByIDAsc(db *gorm.DB) *gorm.DB {
	return db.Order("id asc")
}

func OrderByIDDesc(db *gorm.DB) *gorm.DB {
	return db.Order("id desc")
}

func WithUser(db *gorm.DB) *gorm.DB {
	return db.Preload("User")
}

func WhereRoomID(roomID string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("room_id = ?", roomID)
	}
}

func PreloadRoomMembers(scopes ...func(*gorm.DB) *gorm.DB) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Preload("RoomMembers", func(db *gorm.DB) *gorm.DB {
			return db.Scopes(scopes...)
		})
	}
}

func PreloadUserProviders(scopes ...func(*gorm.DB) *gorm.DB) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Preload("UserProviders", func(db *gorm.DB) *gorm.DB {
			return db.Scopes(scopes...)
		})
	}
}

func WhereUserID(userID string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("user_id = ?", userID)
	}
}

func WhereCreatorID(creatorID string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("creator_id = ?", creatorID)
	}
}

// column cannot be a user parameter
func WhereEqual(column string, value interface{}) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("? = ?", column, value)
	}
}

// column cannot be a user parameter
func WhereLike(column string, value string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("? ILIKE ?", column, utils.LIKE(value))
		default:
			return db.Where("? LIKE ?", column, utils.LIKE(value))
		}
	}
}

func WhereMovieNameLikeOrURLLike(name, url string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("base_name ILIKE ? OR base_url ILIKE ?", utils.LIKE(name), utils.LIKE(url))
		default:
			return db.Where("base_name LIKE ? OR base_url LIKE ?", utils.LIKE(name), utils.LIKE(url))
		}
	}
}

func WhereRoomNameLikeOrCreatorInOrIDLike(name string, ids []string, id string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("name ILIKE ? OR creator_id IN ? OR id ILIKE ?", utils.LIKE(name), ids, id)
		default:
			return db.Where("name LIKE ? OR creator_id IN ? OR id LIKE ?", utils.LIKE(name), ids, id)
		}
	}
}

func WhereRoomNameLikeOrCreatorInOrRoomsIDLike(name string, ids []string, id string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("name ILIKE ? OR creator_id IN ? OR rooms.id ILIKE ?", utils.LIKE(name), ids, id)
		default:
			return db.Where("name LIKE ? OR creator_id IN ? OR rooms.id LIKE ?", utils.LIKE(name), ids, id)
		}
	}
}

func WhereRoomNameLikeOrIDLike(name string, id string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("name ILIKE ? OR id ILIKE ?", utils.LIKE(name), id)
		default:
			return db.Where("name LIKE ? OR id LIKE ?", utils.LIKE(name), id)
		}
	}
}

func WhereRoomNameLike(name string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("name ILIKE ?", utils.LIKE(name))
		default:
			return db.Where("name LIKE ?", utils.LIKE(name))
		}
	}
}

func WhereUsernameLike(name string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("username ILIKE ?", utils.LIKE(name))
		default:
			return db.Where("username LIKE ?", utils.LIKE(name))
		}
	}
}

func WhereCreatorIDIn(ids []string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("creator_id IN ?", ids)
	}
}

func Select(columns ...string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Select(columns)
	}
}

func WhereStatus(status model.RoomStatus) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("status = ?", status)
	}
}

func WhereRole(role model.Role) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("role = ?", role)
	}
}

func WhereUsernameLikeOrIDIn(name string, ids []string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("username ILIKE ? OR id IN ?", utils.LIKE(name), ids)
		default:
			return db.Where("username LIKE ? OR id IN ?", utils.LIKE(name), ids)
		}
	}
}

func WhereIDIn(ids []string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("id IN ?", ids)
	}
}

func WhereRoomSettingWithoutHidden() func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("hidden = ?", false)
	}
}

func WhereIDLike(id string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("id ILIKE ?", utils.LIKE(id))
		default:
			return db.Where("id LIKE ?", utils.LIKE(id))
		}
	}
}

func WhereRoomsIDLike(id string) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		switch dbType {
		case conf.DatabaseTypePostgres:
			return db.Where("rooms.id ILIKE ?", utils.LIKE(id))
		default:
			return db.Where("rooms.id LIKE ?", utils.LIKE(id))
		}
	}
}

func WhereRoomMemberStatus(status model.RoomMemberStatus) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("room_members.status = ?", status)
	}
}

func WhereRoomMemberRole(role model.RoomMemberRole) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		return db.Where("room_members.role = ?", role)
	}
}

type NotFoundError string

func (e NotFoundError) Error() string {
	return string(e) + " not found"
}

func HandleNotFound(err error, errMsg ...string) error {
	if err != nil && errors.Is(err, gorm.ErrRecordNotFound) {
		return NotFoundError(strings.Join(errMsg, " "))
	}
	return err
}

func Transactional(txFunc func(*gorm.DB) error) (err error) {
	tx := db.Begin()
	defer func() {
		if err != nil {
			tx.Rollback()
		} else {
			tx.Commit()
		}
	}()
	err = txFunc(tx)
	return
}

// Helper function to handle update results
func HandleUpdateResult(result *gorm.DB, entityName string) error {
	if result.Error != nil {
		return HandleNotFound(result.Error, entityName)
	}
	if result.RowsAffected == 0 {
		return NotFoundError(entityName)
	}
	return nil
}