package database

import (
	"fmt"

	"git.tovijaeschke.xyz/tovi/JumboPetstore/models"
	"git.tovijaeschke.xyz/tovi/JumboPetstore/util"

	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

func CreatePet(petData *models.Pet) error {
	var (
		photoUrls []string
		photoUrl  string
		fileName  string
		err       error
	)

	for _, photoUrl = range petData.PhotoUrlJson {
		fileName, err = util.DownloadFile(photoUrl)
		if err != nil {
			return err
		}

		petData.PhotoUrls = append(petData.PhotoUrls, models.PetPhoto{
			PetId:    petData.Id,
			FileName: fileName,
		})

		photoUrls = append(photoUrls, fmt.Sprintf(
			"/images/%s",
			fileName,
		))
	}

	petData.PhotoUrlJson = photoUrls

	err = DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Omit("PhotoUrlJson").
		Create(petData).
		Error
	if err != nil {
		return err
	}

	return err
}

func UpdatePet(petData *models.Pet) error {
	var (
		photoUrls []string
		photoUrl  string
		fileName  string
		err       error
	)

	for _, photoUrl = range petData.PhotoUrlJson {
		fileName, err = util.DownloadFile(photoUrl)
		if err != nil {
			return err
		}

		petData.PhotoUrls = append(petData.PhotoUrls, models.PetPhoto{
			PetId:    petData.Id,
			FileName: fileName,
		})

		photoUrls = append(photoUrls, fmt.Sprintf(
			"/images/%s",
			fileName,
		))
	}

	petData.PhotoUrlJson = photoUrls

	// This leaves some orphaned files in ./uploads
	DB.Model(petData).Association("PhotoUrls").Replace(petData.PhotoUrls)
	DB.Model(petData).Association("Tags").Replace(petData.Tags)

	err = DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Omit("PhotoUrlJson").
		Updates(petData).
		Error
	if err != nil {
		return err
	}

	return err
}

func GetPetById(id int) models.Pet {
	var (
		petData   models.Pet
		petPhoto  models.PetPhoto
		photoUrls []string
	)

	DB.Preload(clause.Associations).First(&petData, "id = ?", id)

	for _, petPhoto = range petData.PhotoUrls {
		photoUrls = append(photoUrls, "/images/"+petPhoto.FileName)
	}

	petData.PhotoUrlJson = photoUrls

	return petData
}

func DeletePet(petData models.Pet) {
	DB.Preload(clause.Associations).Delete(&petData)
}

func GetPetsByStatus(status string) ([]models.Pet, error) {
	var (
		petDatas  []models.Pet
		petPhoto  models.PetPhoto
		photoUrls []string
		i         int
		err       error
	)

	err = DB.Preload(clause.Associations).
		Where("status = ?", status).
		Find(&petDatas).
		Error
	if err != nil {
		return petDatas, err
	}

	for i = range petDatas {
		photoUrls = []string{}

		for _, petPhoto = range petDatas[i].PhotoUrls {
			photoUrls = append(photoUrls, "/images/"+petPhoto.FileName)
		}

		petDatas[i].PhotoUrlJson = photoUrls
	}

	return petDatas, err
}

func AddPhotoToPet(petData *models.Pet, fileName string, additionalMetadata string, fileBytes []byte) (string, error) {
	var (
		err error
	)

	fileName, err = util.WriteFile(fileName, fileBytes)

	petData.PhotoUrls = append(petData.PhotoUrls, models.PetPhoto{
		PetId:              petData.Id,
		FileName:           fileName,
		AdditionalMetadata: additionalMetadata,
	})

	err = DB.Session(&gorm.Session{FullSaveAssociations: true}).
		Omit("PhotoUrlJson").
		Updates(&petData).
		Error

	return fileName, err
}