package service

import (
	"context"
	"errors"
	"fmt"
	"io"
	approvalHistoriesService "jaecoo-be/app/module/approval_histories/service"
	"jaecoo-be/app/module/products/mapper"
	"jaecoo-be/app/module/products/repository"
	"jaecoo-be/app/module/products/request"
	"jaecoo-be/app/module/products/response"
	usersRepository "jaecoo-be/app/module/users/repository"
	"jaecoo-be/config/config"
	minioStorage "jaecoo-be/config/config"
	"jaecoo-be/utils/paginator"
	utilSvc "jaecoo-be/utils/service"
	"math/rand"
	"mime"
	"mime/multipart"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"encoding/json"

	"github.com/gofiber/fiber/v2"
	"github.com/minio/minio-go/v7"
	"github.com/rs/zerolog"
)


type productsService struct {
	Repo                    repository.ProductsRepository
	Log                     zerolog.Logger
	Cfg                     *config.Config
	MinioStorage            *minioStorage.MinioStorage
	UsersRepo               usersRepository.UsersRepository
	ApprovalHistoriesService approvalHistoriesService.ApprovalHistoriesService
}

type ProductsService interface {
	GetAll(req request.ProductsQueryRequest) (products []*response.ProductsResponse, paging paginator.Pagination, err error)
	GetOne(id uint) (product *response.ProductsResponse, err error)
	Create(c *fiber.Ctx, req request.ProductsCreateRequest) (product *response.ProductsResponse, err error)
	Update(c *fiber.Ctx, id uint, req request.ProductsUpdateRequest) (product *response.ProductsResponse, err error)
	Delete(id uint) (err error)
	Approve(id uint, authToken string) (product *response.ProductsResponse, err error)
	Reject(id uint, authToken string, message *string) (product *response.ProductsResponse, err error)
	Comment(id uint, authToken string, message *string) (product *response.ProductsResponse, err error)
	UploadFileToMinio(c *fiber.Ctx, fileKey string) (filePath *string, err error)
	Viewer(c *fiber.Ctx) (err error)
}

func NewProductsService(repo repository.ProductsRepository, log zerolog.Logger, cfg *config.Config, minioStorage *minioStorage.MinioStorage, usersRepo usersRepository.UsersRepository, approvalHistoriesService approvalHistoriesService.ApprovalHistoriesService) ProductsService {
	return &productsService{
		Repo:                     repo,
		Log:                      log,
		Cfg:                      cfg,
		MinioStorage:             minioStorage,
		UsersRepo:                usersRepo,
		ApprovalHistoriesService: approvalHistoriesService,
	}
}

func (_i *productsService) GetAll(req request.ProductsQueryRequest) (products []*response.ProductsResponse, paging paginator.Pagination, err error) {
	productsEntity, paging, err := _i.Repo.GetAll(req)
	if err != nil {
		return
	}

	host := _i.Cfg.App.Domain

	for _, product := range productsEntity {
		products = append(products, mapper.ProductsResponseMapper(product, host))
	}

	return
}

func (_i *productsService) GetOne(id uint) (product *response.ProductsResponse, err error) {
	productEntity, err := _i.Repo.FindOne(id)
	if err != nil {
		return
	}

	if productEntity == nil {
		err = errors.New("product not found")
		return
	}

	host := _i.Cfg.App.Domain

	product = mapper.ProductsResponseMapper(productEntity, host)
	return
}

func (_i *productsService) uploadColorFile(
	fileHeader *multipart.FileHeader,
) (*string, error) {

	minioClient, err := _i.MinioStorage.ConnectMinio()
	if err != nil {
		return nil, err
	}

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

	now := time.Now()
	ext := filepath.Ext(fileHeader.Filename)
	name := strings.TrimSuffix(fileHeader.Filename, ext)
	name = strings.ReplaceAll(name, " ", "")

	filename := fmt.Sprintf(
		"%s_%d%s",
		name,
		rand.Intn(999999),
		ext,
	)

	objectName := fmt.Sprintf(
		"products/colors/%d/%d/%s",
		now.Year(),
		now.Month(),
		filename,
	)

	_, err = minioClient.PutObject(
		context.Background(),
		_i.MinioStorage.Cfg.ObjectStorage.MinioStorage.BucketName,
		objectName,
		src,
		fileHeader.Size,
		minio.PutObjectOptions{},
	)
	if err != nil {
		return nil, err
	}

	return &objectName, nil
}

func (_i *productsService) Create(c *fiber.Ctx, req request.ProductsCreateRequest) (product *response.ProductsResponse, err error) {
	// Handle file upload if exists
	if filePath, uploadErr := _i.UploadFileToMinio(c, "file"); uploadErr == nil && filePath != nil {
		req.ThumbnailPath = filePath
	}

	// 🔥 CONVERT REQUEST KE ENTITY
	productEntity := req.ToEntity()

	// ===============================
	// 3️⃣ 🔥 HANDLE COLORS + IMAGE
	// ===============================
	form, _ := c.MultipartForm()
	colorFiles := form.File["color_images"]

	var colorEntities []struct {
		Name      string  `json:"name"`
		ImagePath *string `json:"image_path"`
	}

	for i, cReq := range req.Colors {
		if cReq.Name == "" {
			continue
		}

		color := struct {
			Name      string  `json:"name"`
			ImagePath *string `json:"image_path"`
		}{
			Name: cReq.Name,
		}

		// hubungkan file berdasarkan index
		if len(colorFiles) > i {
			fileHeader := colorFiles[i]

			path, err := _i.uploadColorFile(fileHeader)
			if err == nil && path != nil {
				color.ImagePath = path
			}
		}

		colorEntities = append(colorEntities, color)
	}

	// simpan ke kolom products.colors (JSON string)
	if len(colorEntities) > 0 {
		bytes, _ := json.Marshal(colorEntities)
		str := string(bytes)
		productEntity.Colors = &str
	}

	// 4️⃣ DEFAULT ACTIVE
	isActive := true
	productEntity.IsActive = &isActive

	// 5️⃣ SIMPAN KE DB
	productEntity, err = _i.Repo.Create(productEntity)
	if err != nil {
		return
	}

	// 6️⃣ RESPONSE
	host := _i.Cfg.App.Domain
	product = mapper.ProductsResponseMapper(productEntity, host)
	return
}

func (_i *productsService) UploadFileToMinio(c *fiber.Ctx, fileKey string) (filePath *string, err error) {
	form, err := c.MultipartForm()
	if err != nil {
		return nil, err
	}

	files := form.File[fileKey]
	if len(files) == 0 {
		return nil, nil // No file uploaded, return nil without error
	}

	fileHeader := files[0]

	// Create minio connection
	minioClient, err := _i.MinioStorage.ConnectMinio()
	if err != nil {
		return nil, err
	}

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

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

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

	// Generate unique filename
	now := time.Now()
	rand.New(rand.NewSource(now.UnixNano()))
	randUniqueId := rand.Intn(1000000)

	newFilenameWithoutExt := filenameWithoutExt + "_" + strconv.Itoa(randUniqueId)
	newFilename := newFilenameWithoutExt + "." + extension

	// Create object name with path structure
	objectName := fmt.Sprintf("products/upload/%d/%d/%s", now.Year(), now.Month(), newFilename)

	_i.Log.Info().Str("timestamp", time.Now().
		Format(time.RFC3339)).Str("Service:Resource", "Products:UploadFileToMinio").
		Interface("Uploading file", objectName).Msg("")

	// Upload file to MinIO
	_, err = minioClient.PutObject(context.Background(), bucketName, objectName, src, fileHeader.Size, minio.PutObjectOptions{})
	if err != nil {
		_i.Log.Error().Str("timestamp", time.Now().
			Format(time.RFC3339)).Str("Service:Resource", "Products:UploadFileToMinio").
			Interface("Error uploading file", err).Msg("")
		return nil, err
	}

	_i.Log.Info().Str("timestamp", time.Now().
		Format(time.RFC3339)).Str("Service:Resource", "Products:UploadFileToMinio").
		Interface("Successfully uploaded", objectName).Msg("")

	return &objectName, nil
}

func (_i *productsService) Update(c *fiber.Ctx, id uint, req request.ProductsUpdateRequest) (product *response.ProductsResponse, err error) {
	// Handle file upload if exists
	if filePath, uploadErr := _i.UploadFileToMinio(c, "file"); uploadErr == nil && filePath != nil {
		req.ThumbnailPath = filePath
	}

	productEntity := req.ToEntity()

	err = _i.Repo.Update(id, productEntity)
	if err != nil {
		return
	}

	productEntity, err = _i.Repo.FindOne(id)
	if err != nil {
		return
	}

	host := _i.Cfg.App.Domain

	product = mapper.ProductsResponseMapper(productEntity, host)
	return
}

func (_i *productsService) Delete(id uint) (err error) {
	err = _i.Repo.Delete(id)
	return
}

// func (_i *productsService) Viewer(c *fiber.Ctx) (err error) {
// 	filename := c.Params("filename")

// 	// Find product by filename (repository will search using LIKE pattern)
// 	result, err := _i.Repo.FindByThumbnailPath(filename)
// 	if err != nil {
// 		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{
// 			"error": true,
// 			"msg":   "Product file not found",
// 		})
// 	}

// 	if result.ThumbnailPath == nil || *result.ThumbnailPath == "" {
// 		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{
// 			"error": true,
// 			"msg":   "Product thumbnail path not found",
// 		})
// 	}

// 	ctx := context.Background()
// 	bucketName := _i.MinioStorage.Cfg.ObjectStorage.MinioStorage.BucketName
// 	objectName := *result.ThumbnailPath

// 	_i.Log.Info().Str("timestamp", time.Now().
// 		Format(time.RFC3339)).Str("Service:Resource", "Products:Viewer").
// 		Interface("data", objectName).Msg("")

// 	// Create minio connection
// 	minioClient, err := _i.MinioStorage.ConnectMinio()
// 	if err != nil {
// 		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 {
// 		_i.Log.Error().Str("timestamp", time.Now().
// 			Format(time.RFC3339)).Str("Service:Resource", "Products:Viewer").
// 			Interface("Error getting file", err).Msg("")
// 		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
// 			"error": true,
// 			"msg":   "Failed to retrieve file",
// 		})
// 	}
// 	defer fileContent.Close()

// 	// Determine Content-Type based on file extension
// 	contentType := mime.TypeByExtension("." + getFileExtension(objectName))
// 	if contentType == "" {
// 		contentType = "application/octet-stream" // fallback if no MIME type matches
// 	}

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

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

// 	return
// }

func (_i *productsService) Viewer(c *fiber.Ctx) error {
	// ambil full path setelah /viewer
	objectPath := strings.TrimPrefix(c.Params("*"), "/")

	if objectPath == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": true,
			"msg":   "File path is required",
		})
	}

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

	minioClient, err := _i.MinioStorage.ConnectMinio()
	if err != nil {
		return c.Status(500).JSON(fiber.Map{
			"error": true,
			"msg":   err.Error(),
		})
	}

	file, err := minioClient.GetObject(ctx, bucketName, objectPath, minio.GetObjectOptions{})
	if err != nil {
		return c.Status(404).JSON(fiber.Map{
			"error": true,
			"msg":   "Product file not found",
		})
	}
	defer file.Close()

	// content-type
	contentType := mime.TypeByExtension(filepath.Ext(objectPath))
	if contentType == "" {
		contentType = "application/octet-stream"
	}
	c.Set("Content-Type", contentType)

	_, err = io.Copy(c.Response().BodyWriter(), file)
	return err
}


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]
}

func (_i *productsService) Approve(id uint, authToken string) (product *response.ProductsResponse, err error) {
	// Get user from token
	user := utilSvc.GetUserInfo(_i.Log, _i.UsersRepo, authToken)
	if user == nil {
		err = errors.New("unauthorized: user not found")
		return
	}

	// Check if user has admin role (roleId = 1)
	if user.UserRoleId != 1 {
		err = errors.New("unauthorized: only admin can approve")
		return
	}

	// Approve product (update status_id to 2)
	err = _i.Repo.Approve(id)
	if err != nil {
		return
	}

	// Save approval history
	userID := user.ID
	statusApprove := 2

    err = _i.ApprovalHistoriesService.CreateHistory(
	"products",
	id,
	&statusApprove, // ✅ pointer
	"approve",
	&userID,
	nil,
    )
	if err != nil {
		_i.Log.Error().Err(err).Msg("Failed to save approval history")
	}

	// Get updated product data
	productEntity, err := _i.Repo.FindOne(id)
	if err != nil {
		return
	}

	if productEntity == nil {
		err = errors.New("product not found")
		return
	}

	host := _i.Cfg.App.Domain
	product = mapper.ProductsResponseMapper(productEntity, host)
	return
}

func (_i *productsService) Reject(id uint, authToken string, message *string) (product *response.ProductsResponse, err error) {
	// Get user from token
	user := utilSvc.GetUserInfo(_i.Log, _i.UsersRepo, authToken)
	if user == nil {
		err = errors.New("unauthorized: user not found")
		return
	}

	// Check if user has admin role (roleId = 1)
	if user.UserRoleId != 1 {
		err = errors.New("unauthorized: only admin can reject")
		return
	}

	// Reject product (update status_id to 3)
	err = _i.Repo.Reject(id)
	if err != nil {
		return
	}

	// Save rejection history
	userID := user.ID
	statusReject := 3

    err = _i.ApprovalHistoriesService.CreateHistory(
	"productss",
	id,
	&statusReject, // ✅ pointer
	"reject",
	&userID,
	message,
    )
	if err != nil {
		_i.Log.Error().Err(err).Msg("Failed to save rejection history")
	}

	// Get updated product data
	productEntity, err := _i.Repo.FindOne(id)
	if err != nil {
		return
	}

	if productEntity == nil {
		err = errors.New("product not found")
		return
	}

	host := _i.Cfg.App.Domain
	product = mapper.ProductsResponseMapper(productEntity, host)
	return
}

func (_i *productsService) Comment(
	id uint,
	authToken string,
	message *string,
) (banner *response.ProductsResponse, err error) {

	user := utilSvc.GetUserInfo(_i.Log, _i.UsersRepo, authToken)
	if user == nil {
		err = errors.New("unauthorized")
		return
	}

	if user.UserRoleId != 1 {
		err = errors.New("only admin can comment")
		return
	}

	// SIMPAN COMMENT KE HISTORY (INTI FITURNYA)
	userID := user.ID
	err = _i.ApprovalHistoriesService.CreateHistory(
		"banners",
		id,
		nil,           // status_id NULL
		"comment",
		&userID,
		message,
	)
	if err != nil {
		return
	}

	// Ambil banner terbaru
	bannerEntity, err := _i.Repo.FindOne(id)
	if err != nil {
		return
	}

	if bannerEntity == nil {
		err = errors.New("banner not found")
		return
	}

	host := _i.Cfg.App.Domain
	banner = mapper.ProductsResponseMapper(bannerEntity, host)
	return
}