package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
)

type videoMeta struct {
	Title       string `json:"title"`
	Description string `json:"description"`
}

type ytVideosResponse struct {
	Items []struct {
		Snippet struct {
			Title       string `json:"title"`
			Description string `json:"description"`
		} `json:"snippet"`
	} `json:"items"`
}

func fetchVideoMeta(videoID, apiKey string) (*videoMeta, error) {
	q := url.Values{}
	q.Set("part", "snippet")
	q.Set("id", videoID)
	q.Set("key", apiKey)

	resp, err := http.Get("https://www.googleapis.com/youtube/v3/videos?" + q.Encode())
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("youtube api status %d", resp.StatusCode)
	}

	var parsed ytVideosResponse
	if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
		return nil, err
	}
	if len(parsed.Items) == 0 {
		return nil, fmt.Errorf("video not found: %s", videoID)
	}

	return &videoMeta{
		Title:       parsed.Items[0].Snippet.Title,
		Description: parsed.Items[0].Snippet.Description,
	}, nil
}