package db

import (
	"errors"
	"fmt"
	"path"

	log "github.com/sirupsen/logrus"
	// "gorm.io/gorm/logger"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"

	"reichard.io/imagini/graph/model"
	"reichard.io/imagini/internal/config"
)

type DBManager struct {
	db *gorm.DB
}

func NewMgr(c *config.Config) *DBManager {
	gormConfig := &gorm.Config{
		PrepareStmt: true,
		// Logger: logger.Default.LogMode(logger.Silent),
	}

	// Create manager
	dbm := &DBManager{}

	if c.DBType == "SQLite" {
		dbLocation := path.Join(c.ConfigPath, "imagini.db")
		dbm.db, _ = gorm.Open(sqlite.Open(dbLocation), gormConfig)
	} else {
		log.Fatal("Unsupported Database")
	}

	// Initialize database
	dbm.db.AutoMigrate(&model.Device{})
	dbm.db.AutoMigrate(&model.User{})
	dbm.db.AutoMigrate(&model.MediaItem{})
	dbm.db.AutoMigrate(&model.Tag{})
	dbm.db.AutoMigrate(&model.Album{})

	// Determine whether to bootstrap
	var count int64
	dbm.db.Model(&model.User{}).Count(&count)
	if count == 0 {
		dbm.bootstrapDatabase()
	}

	return dbm
}

func (dbm *DBManager) bootstrapDatabase() {
	log.Info("[query] Bootstrapping database.")

	password := "admin"
	user := &model.User{
		Username: "admin",
		AuthType: "Local",
		Password: &password,
		Role:     model.RoleAdmin,
	}

	err := dbm.CreateUser(user)

	if err != nil {
		log.Fatal("[query] Unable to bootstrap database.")
	}
}

// TODO
func (dbm *DBManager) QueryBuilder(dest interface{}, params []byte) (int64, error) {
	// TODO:
	//  - Where Filters
	//  - Sort Filters
	//  - Paging Filters

	objType := fmt.Sprintf("%T", dest)
	if objType == "*[]model.MediaItem" {
		// TODO: Validate MediaItem Type
	} else {
		// Return Error
		return 0, errors.New("Invalid type")
	}

	var count int64
	err := dbm.db.Find(dest).Count(&count).Error
	return count, err

	// Paging:
	//  - Regular Pagination:
	//      - /api/v1/MediaItems?page[limit]=50&page=2
	//  - Meta Count Only
	//      - /api/v1/MediaItems?page[limit]=0

	// Sorting:
	//  - Ascending Sort:
	//      - /api/v1/MediaItems?sort=created_at
	//  - Descending Sort:
	//      - /api/v1/MediaItems?sort=-created_at

	// Filters:
	//  - Greater Than / Less Than (created_at, updated_at, exif_date)
	//      - /api/v1/MediaItems?filter[created_at]>=2020-01-01&filter[created_at]<=2021-01-01
	//  - Long / Lat Range (latitude, longitude)
	//      - /api/v1/MediaItems?filter[latitude]>=71.1827&filter[latitude]<=72.0000&filter[longitude]>=100.000&filter[longitude]<=101.0000
	//  - Image / Video (media_type)
	//      - /api/v1/MediaItems?filter[media_type]=Image
	//  - Tags (tags)
	//      - /api/v1/MediaItems?filter[tags]=id1,id2,id3
	//  - Albums (albums)
	//      - /api/v1/MediaItems?filter[albums]=id1
}