package minio

import (
	"context"
	"fmt"
	"io"

	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
)

// Bucket names
const (
	recipeImgBucket string = "recipeimg"
)

const location string = "eu_ru"

type ObjStorage struct {
	minio *minio.Client
}

func New(ctx context.Context, addr, user, password string) (*ObjStorage, error) {
	const op = "media_storage.minio.New"

	minioClient, err := minio.New(addr, &minio.Options{
		Creds:  credentials.NewStaticV4(user, password, ""),
		Secure: false,
	})
	if err != nil {
		return nil, fmt.Errorf("%s: %w", op, err)
	}

	return &ObjStorage{minio: minioClient}, nil
}

// Upload file to bucket
func (o *ObjStorage) uploadFile(ctx context.Context, bucketName string, objectName string, fileBuffer io.Reader, contentType string, fileSize int64) error {
	const op = "media_storage.minio.UploadFile"
	// Upload the zip file with PutObject
	_, err := o.minio.PutObject(ctx, bucketName, objectName, fileBuffer, fileSize, minio.PutObjectOptions{ContentType: contentType})
	if err != nil {
		return fmt.Errorf("%s: %w", op, err)
	}
	return nil
}

// Get file from bucket
func (o *ObjStorage) getFile(ctx context.Context, bucketName string, objectName string) (*minio.Object, error) {
	const op = "media_storage.minio.GetFile"
	// Get object from minio
	minio_obj, err := o.minio.GetObject(ctx, bucketName, objectName, minio.GetObjectOptions{Checksum: true})
	if err != nil {
		return nil, fmt.Errorf("%s: %w", op, err)
	}
	return minio_obj, nil
}

// Delete file from bucket
//
//nolint:unused
func (o *ObjStorage) delFile(ctx context.Context, bucketName string, objectName string) error {
	const op = "media_storage.minio.DelFile"
	err := o.minio.RemoveObject(ctx, bucketName, objectName, minio.RemoveObjectOptions{ForceDelete: true})
	if err != nil {
		return fmt.Errorf("%s: %w", op, err)
	}
	return nil
}

// checkBucketExists creates bucket if it don't exists.
func (o *ObjStorage) checkBucketExists(ctx context.Context, bucketName string) error {
	const op = "media_storage.minio.checkBucketExists"
	// Check exists
	exists, err := o.minio.BucketExists(ctx, bucketName)
	if err != nil {
		return fmt.Errorf("%s: %w", op, err)
	}
	if !exists {
		// Create bucket
		err := o.minio.MakeBucket(ctx, bucketName, minio.MakeBucketOptions{Region: location})
		if err != nil {
			return fmt.Errorf("%s: %w", op, err)
		}
	}
	return nil
}

// SaveRecipeImage saves image to bucket for recipes photos.
func (o *ObjStorage) SaveRecipeImage(ctx context.Context, imageFile io.Reader, filename string, contentType string, fileSize int64) error {
	const op = "media_storage.minio.SaveRecipeImage"
	err := o.checkBucketExists(ctx, recipeImgBucket)
	if err != nil {
		return fmt.Errorf("%s: %w", op, err)
	}
	err = o.uploadFile(ctx, recipeImgBucket, filename, imageFile, contentType, fileSize)
	if err != nil {
		return fmt.Errorf("%s: %w", op, err)
	}
	return err
}

// RecipeImage gets image from recipe's images bucket by filename.
func (o *ObjStorage) RecipeImage(ctx context.Context, filename string) (io.ReadCloser, error) {
	const op = "media_storage.minio.RecipeImage"
	err := o.checkBucketExists(ctx, recipeImgBucket)
	if err != nil {
		return nil, fmt.Errorf("%s: %w", op, err)
	}
	obj, err := o.getFile(ctx, recipeImgBucket, filename)
	if err != nil {
		return nil, fmt.Errorf("%s: %w", op, err)
	}
	return obj, err
}