package util

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
)

func GetSongIdsByHash(hashs []string) (hashToSongId map[string]string, err error) {
	if len(hashs) == 0 {
		return nil, nil
	}
	//每批最多49个
	hashToSongId = make(map[string]string)
	batchSize := 49
	for i := 0; i < len(hashs); i += batchSize {
		end := i + batchSize
		if end > len(hashs) {
			end = len(hashs)
		}
		batchHashs := hashs[i:end]
		queryUrl := "https://api.beatsaver.com/maps/hash/" + strings.Join(batchHashs, ",")
		resp, err := http.Get(queryUrl)
		if err != nil {
			return nil, err
		}
		defer resp.Body.Close()
		if resp.StatusCode != 200 {
			return nil, fmt.Errorf("获取歌曲ID失败，状态码：%d,url:%s", resp.StatusCode, queryUrl)
		}
		body, err := io.ReadAll(resp.Body)
		if err != nil {
			return nil, err
		}
		var response = make(map[string]struct {
			ID string `json:"id"`
		})
		if len(batchHashs) == 1 {
			var singleResponse struct {
				ID string `json:"id"`
			}
			err = json.Unmarshal(body, &singleResponse)
			response[batchHashs[0]] = singleResponse
		} else {
			err = json.Unmarshal(body, &response)
		}
		if err != nil {
			return nil, err
		}
		for hash, data := range response {
			hashToSongId[hash] = data.ID
		}
	}
	return hashToSongId, nil
}