package client

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net/http"
	"strconv"
)

func (cli *Client) GetManifest(ctx context.Context, rawref string) (bool, string, []byte, error) {
	var err error
	var exist bool
	var mime string
	var man []byte

	ref, err := NewReference(rawref)
	if err != nil {
		return exist, mime, man, err
	}
	uri := ref.Manifest()

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, uri, nil)
	if err != nil {
		return exist, mime, man, err
	}
	req.Header.Set("User-Agent", cli.userAgent)
        req.Header.Set("Accept", "*/*")
	resp, err := cli.httpClient.Do(req)
	if err != nil {
		return exist, mime, man, err
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusNotFound {
		return exist, mime, man, err
	}
	if resp.StatusCode != http.StatusOK {
		err := fmt.Errorf("Unxected response code %s", resp.Status)
		return exist, mime, man, err
	}
	contentLength := resp.Header.Get("Content-Length")
	manSize, err := strconv.ParseInt(contentLength, 10, 64)
	if err != nil {
		return exist, mime, man, err
	}
	mime = resp.Header.Get("Content-Type")
	if mime == "" {
		err := fmt.Errorf("Empty MIME type declaration")
		return exist, mime, man, err
	}
	buffer := bytes.NewBuffer(nil)
	recSize, err := io.Copy(buffer, resp.Body)
	if manSize != recSize {
		err := fmt.Errorf("Mismatch declared and actual body size")
		return exist, mime, man, err
	}
        man = buffer.Bytes()
	exist = true
	return exist, mime, man, err
}