package service

import (
	"context"
	"fmt"
	"github.com/gofiber/fiber/v2"
	"github.com/google/uuid"
	"github.com/minio/minio-go/v7"
	"github.com/rs/zerolog"
	"io"
	"log"
	"math/rand"
	"mime"
	"path/filepath"
	"strconv"
	"strings"
	"time"
	"web-qudo-be/app/database/entity"
	magazineFilesRepository "web-qudo-be/app/module/magazine_files/repository"
	"web-qudo-be/app/module/magazines/mapper"
	"web-qudo-be/app/module/magazines/repository"
	"web-qudo-be/app/module/magazines/request"
	"web-qudo-be/app/module/magazines/response"
	usersRepository "web-qudo-be/app/module/users/repository"
	config "web-qudo-be/config/config"
	minioStorage "web-qudo-be/config/config"
	"web-qudo-be/utils/paginator"
	utilSvc "web-qudo-be/utils/service"
)

// MagazinesService
type magazinesService struct {
	Repo              repository.MagazinesRepository
	UsersRepo         usersRepository.UsersRepository
	MagazineFilesRepo magazineFilesRepository.MagazineFilesRepository
	MinioStorage      *minioStorage.MinioStorage
	Log               zerolog.Logger
	Cfg               *config.Config
}

// MagazinesService define interface of IMagazinesService
type MagazinesService interface {
	All(clientId *uuid.UUID, req request.MagazinesQueryRequest) (magazines []*response.MagazinesResponse, paging paginator.Pagination, err error)
	Show(clientId *uuid.UUID, id uint) (magazines *response.MagazinesResponse, err error)
	Save(clientId *uuid.UUID, req request.MagazinesCreateRequest, authToken string) (magazines *entity.Magazines, err error)
	Update(clientId *uuid.UUID, id uint, req request.MagazinesUpdateRequest) (err error)
	SaveThumbnail(clientId *uuid.UUID, c *fiber.Ctx) (err error)
	Viewer(clientId *uuid.UUID, c *fiber.Ctx) (err error)
	Delete(clientId *uuid.UUID, id uint) error
}

// NewMagazinesService init MagazinesService
func NewMagazinesService(repo repository.MagazinesRepository, magazineFilesRepo magazineFilesRepository.MagazineFilesRepository, usersRepo usersRepository.UsersRepository, minioStorage *minioStorage.MinioStorage, log zerolog.Logger, cfg *config.Config) MagazinesService {

	return &magazinesService{
		Repo:              repo,
		MagazineFilesRepo: magazineFilesRepo,
		UsersRepo:         usersRepo,
		MinioStorage:      minioStorage,
		Log:               log,
		Cfg:               cfg,
	}
}

// All implement interface of MagazinesService
func (_i *magazinesService) All(clientId *uuid.UUID, req request.MagazinesQueryRequest) (magaziness []*response.MagazinesResponse, paging paginator.Pagination, err error) {
	results, paging, err := _i.Repo.GetAll(clientId, req)
	if err != nil {
		return
	}

	host := _i.Cfg.App.Domain
	for _, result := range results {
		magaziness = append(magaziness, mapper.MagazinesResponseMapper(result, _i.MagazineFilesRepo, host))
	}

	return
}

func (_i *magazinesService) Show(clientId *uuid.UUID, id uint) (magazines *response.MagazinesResponse, err error) {
	result, err := _i.Repo.FindOne(clientId, id)
	if err != nil {
		return nil, err
	}
	host := _i.Cfg.App.Domain
	return mapper.MagazinesResponseMapper(result, _i.MagazineFilesRepo, host), nil
}

func (_i *magazinesService) Save(clientId *uuid.UUID, req request.MagazinesCreateRequest, authToken string) (magazines *entity.Magazines, err error) {
	_i.Log.Info().Interface("data", req).Msg("")
	newReq := req.ToEntity()

	createdBy := utilSvc.GetUserInfo(_i.Log, _i.UsersRepo, authToken)
	newReq.CreatedById = &createdBy.ID

	// Set ClientId on entity
	newReq.ClientId = clientId

	saveMagazineResponse, err := _i.Repo.Create(newReq)
	if err != nil {
		return nil, err
	}

	return saveMagazineResponse, nil
}

func (_i *magazinesService) SaveThumbnail(clientId *uuid.UUID, c *fiber.Ctx) (err error) {

	id, err := strconv.ParseUint(c.Params("id"), 10, 0)
	if err != nil {
		return err
	}

	_i.Log.Info().Str("timestamp", time.Now().
		Format(time.RFC3339)).Str("Service:magazinesService", "Methods:SaveThumbnail").
		Interface("id", id).Msg("")

	bucketName := _i.MinioStorage.Cfg.ObjectStorage.MinioStorage.BucketName

	form, err := c.MultipartForm()
	if err != nil {
		return err
	}
	files := form.File["files"]

	// Create minio connection.
	minioClient, err := _i.MinioStorage.ConnectMinio()
	if err != nil {
		// Return status 500 and minio connection error.
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": true,
			"msg":   err.Error(),
		})
	}

	// Iterasi semua file yang diunggah
	for _, file := range files {

		_i.Log.Info().Str("timestamp", time.Now().
			Format(time.RFC3339)).Str("Service:Resource", "Uploader:: loop1").
			Interface("data", file).Msg("")

		src, err := file.Open()
		if err != nil {
			return err
		}
		defer src.Close()

		filename := filepath.Base(file.Filename)
		filename = strings.ReplaceAll(filename, " ", "")
		filenameWithoutExt := filepath.Clean(filename[:len(filename)-len(filepath.Ext(filename))])
		extension := filepath.Ext(file.Filename)[1:]

		now := time.Now()
		rand.New(rand.NewSource(now.UnixNano()))
		randUniqueId := rand.Intn(1000000)

		newFilenameWithoutExt := filenameWithoutExt + "_" + strconv.Itoa(randUniqueId)
		newFilename := newFilenameWithoutExt + "." + extension
		objectName := fmt.Sprintf("magazines/thumbnail/%d/%d/%s", now.Year(), now.Month(), newFilename)

		findCategory, err := _i.Repo.FindOne(clientId, uint(id))
		findCategory.ThumbnailName = &newFilename
		findCategory.ThumbnailPath = &objectName
		err = _i.Repo.Update(clientId, uint(id), findCategory)
		if err != nil {
			return err
		}

		// Upload file ke MinIO
		_, err = minioClient.PutObject(context.Background(), bucketName, objectName, src, file.Size, minio.PutObjectOptions{})
		if err != nil {
			return err
		}
	}

	return
}

func (_i *magazinesService) Update(clientId *uuid.UUID, id uint, req request.MagazinesUpdateRequest) (err error) {
	_i.Log.Info().Interface("data", req).Msg("")

	// Set ClientId on entity
	entity := req.ToEntity()
	entity.ClientId = clientId

	return _i.Repo.Update(clientId, id, entity)
}

func (_i *magazinesService) Delete(clientId *uuid.UUID, id uint) error {
	return _i.Repo.Delete(clientId, id)
}

func (_i *magazinesService) Viewer(clientId *uuid.UUID, c *fiber.Ctx) (err error) {
	thumbnailName := c.Params("thumbnailName")

	emptyImage := "empty-image.jpg"
	searchThumbnail := emptyImage
	if thumbnailName != emptyImage {
		result, err := _i.Repo.FindByFilename(clientId, thumbnailName)
		if err != nil {
			return err
		}
		_i.Log.Info().Str("timestamp", time.Now().
			Format(time.RFC3339)).Str("Service:Resource", "magazinesService:Viewer").
			Interface("resultThumbnail", result.ThumbnailPath).Msg("")

		if result.ThumbnailPath != nil {
			searchThumbnail = *result.ThumbnailPath
		} else {
			searchThumbnail = "magazines/thumbnail/" + emptyImage
		}
	} else {
		searchThumbnail = "magazines/thumbnail/" + emptyImage
	}

	ctx := context.Background()
	bucketName := _i.MinioStorage.Cfg.ObjectStorage.MinioStorage.BucketName
	objectName := searchThumbnail

	// Create minio connection.
	minioClient, err := _i.MinioStorage.ConnectMinio()
	if err != nil {
		// Return status 500 and minio connection error.
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": true,
			"msg":   err.Error(),
		})
	}

	fileContent, err := minioClient.GetObject(ctx, bucketName, objectName, minio.GetObjectOptions{})
	if err != nil {
		log.Fatalln(err)
	}
	defer fileContent.Close()

	contentType := mime.TypeByExtension("." + getFileExtension(objectName))
	if contentType == "" {
		contentType = "application/octet-stream"
	}

	c.Set("Content-Type", contentType)

	if _, err := io.Copy(c.Response().BodyWriter(), fileContent); err != nil {
		return err
	}

	return
}

func getFileExtension(filename string) string {
	// split file name
	parts := strings.Split(filename, ".")

	// jika tidak ada ekstensi, kembalikan string kosong
	if len(parts) == 1 || (len(parts) == 2 && parts[0] == "") {
		return ""
	}

	// ambil ekstensi terakhir
	return parts[len(parts)-1]
}