package op

import (
	"errors"
	"hash/crc32"
	"time"

	"github.com/synctv-org/synctv/internal/db"
	"github.com/synctv-org/synctv/internal/model"
	synccache "github.com/synctv-org/synctv/utils/syncCache"
)

var roomTTL = time.Hour * 24 * 2
var roomCache *synccache.SyncCache[uint, *Room]

func CreateRoom(name, password string, conf ...db.CreateRoomConfig) (*Room, error) {
	r, err := db.CreateRoom(name, password, conf...)
	if err != nil {
		return nil, err
	}
	return InitRoom(r)
}

func InitRoom(room *model.Room) (*Room, error) {
	r := &Room{
		Room:    *room,
		version: crc32.ChecksumIEEE(room.HashedPassword),
		current: newCurrent(),
		movies: movies{
			roomID: room.ID,
		},
	}
	i, loaded := roomCache.LoadOrStore(room.ID, r, roomTTL)
	if loaded {
		return r, errors.New("room already init")
	}
	return i.Value(), nil
}

func LoadOrInitRoom(room *model.Room) (*Room, bool) {
	i, loaded := roomCache.LoadOrStore(room.ID, &Room{
		Room:    *room,
		version: crc32.ChecksumIEEE(room.HashedPassword),
		current: newCurrent(),
		movies: movies{
			roomID: room.ID,
		},
	}, roomTTL)
	if loaded {
		i.SetExpiration(time.Now().Add(roomTTL))
	}
	return i.Value(), loaded
}

func DeleteRoom(roomID uint) error {
	err := db.DeleteRoomByID(roomID)
	if err != nil {
		return err
	}
	return CloseRoom(roomID)
}

func CloseRoom(roomID uint) error {
	r, loaded := roomCache.LoadAndDelete(roomID)
	if loaded {
		r.Value().close()
	}
	return errors.New("room not found in cache")
}

func LoadRoomByID(id uint) (*Room, error) {
	r2, loaded := roomCache.Load(id)
	if loaded {
		r2.SetExpiration(time.Now().Add(roomTTL))
		return r2.Value(), nil
	}
	return nil, errors.New("room not found")
}

func LoadOrInitRoomByID(id uint) (*Room, error) {
	i, loaded := roomCache.Load(id)
	if loaded {
		i.SetExpiration(time.Now().Add(roomTTL))
		return i.Value(), nil
	}
	room, err := db.GetRoomByID(id)
	if err != nil {
		return nil, err
	}
	r, _ := LoadOrInitRoom(room)
	return r, nil
}

func ClientNum(roomID uint) int64 {
	r, loaded := roomCache.Load(roomID)
	if loaded {
		return r.Value().ClientNum()
	}
	return 0
}

func HasRoom(roomID uint) bool {
	_, ok := roomCache.Load(roomID)
	if ok {
		return true
	}
	ok, err := db.HasRoom(roomID)
	if err != nil {
		return false
	}
	return ok
}

func HasRoomByName(name string) bool {
	ok, err := db.HasRoomByName(name)
	if err != nil {
		return false
	}
	return ok
}

func SetRoomPassword(roomID uint, password string) error {
	r, err := LoadOrInitRoomByID(roomID)
	if err != nil {
		return err
	}
	return r.SetPassword(password)
}

func GetAllRoomsInCacheWithNoNeedPassword() []*Room {
	rooms := make([]*Room, 0)
	roomCache.Range(func(key uint, value *synccache.Entry[*Room]) bool {
		v := value.Value()
		if !v.NeedPassword() {
			rooms = append(rooms, v)
		}
		return true
	})
	return rooms
}

func GetAllRoomsInCacheWithoutHidden() []*Room {
	rooms := make([]*Room, 0)
	roomCache.Range(func(key uint, value *synccache.Entry[*Room]) bool {
		v := value.Value()
		if !v.Settings.Hidden {
			rooms = append(rooms, v)
		}
		return true
	})
	return rooms
}