package space

import (
	"context"
	"errors"
	"fmt"
	"git.aiterp.net/rpdata/api/internal/config"
	"io"

	minio "github.com/minio/minio-go"
)

type Client struct {
	bucket    string
	urlRoot   string
	spaceRoot string
	maxSize   int64

	s3 *minio.Client
}

func (client *Client) MaxSize() int64 {
	return client.maxSize
}

// UploadFile uploads the file to the space. This does not do any checks on it, so the endpoints should
// ensure that's all okay.
func (client *Client) UploadFile(ctx context.Context, name string, mimeType string, reader io.Reader, size int64) error {
	if size > client.maxSize {
		return errors.New("file is too big")
	}

	_, err := client.s3.PutObjectWithContext(ctx, client.bucket, client.spaceRoot+"/"+name, reader, size, minio.PutObjectOptions{
		ContentType: mimeType,
		UserMetadata: map[string]string{
			"x-amz-acl": "public-read",
		},
	})
	if err != nil {
		return err
	}

	_, err = client.s3.StatObject(client.bucket, client.spaceRoot+"/"+name, minio.StatObjectOptions{})
	if err != nil {
		return err
	}

	return nil
}

// RemoveFile removes a file from the space
func (client *Client) RemoveFile(name string) error {
	return client.s3.RemoveObject(client.bucket, client.spaceRoot+"/"+name)
}

// DownloadFile opens a file for download, using the same path format as the UploadFile function. Remember to Close it!
// The returned stream also has `ReaderAt` and `Seeker`, but those are impl. details.
func (client *Client) DownloadFile(ctx context.Context, path string) (io.ReadCloser, error) {
	return client.s3.GetObjectWithContext(ctx, client.bucket, client.spaceRoot+"/"+path, minio.GetObjectOptions{})
}

// URLFromPath gets the URL from the path returned by UploadFile
func (client *Client) URLFromPath(path string) string {
	return client.urlRoot + path
}

// Connect connects to a S3 space.
func Connect(cfg config.Space) (*Client, error) {
	client, err := minio.New(cfg.Host, cfg.AccessKey, cfg.SecretKey, true)
	if err != nil {
		return nil, err
	}

	exists, err := client.BucketExists(cfg.Bucket)
	if err != nil {
		return nil, err
	}
	if !exists {
		return nil, errors.New("bucket not found")
	}

	urlRoot := cfg.URLRoot
	if urlRoot == "" {
		urlRoot = fmt.Sprintf("https://%s.%s/%s/", cfg.Bucket, cfg.Host, cfg.Root)
	} else {
		urlRoot += "/" + cfg.Root + "/"
	}

	return &Client{
		bucket:    cfg.Bucket,
		urlRoot:   urlRoot,
		spaceRoot: cfg.Root,
		maxSize:   cfg.MaxSize,
		s3:        client,
	}, nil
}