package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
)

const youtubeAPI = "https://www.googleapis.com/youtube/v3/"

/* function to make an api request */
func apiRequest(w http.ResponseWriter, r *http.Request, endpoint string, videoIdParam string, part string) {
	videoID := r.URL.Query().Get("id")
	if videoID == "" {
		msg := "Missing ?id=VIDEO_ID parameter"
		http.Error(w, msg, http.StatusBadRequest)
		return
	}

	if apiKey == "" {
		msg := "API_KEY environment variable not set"
		http.Error(w, msg, http.StatusInternalServerError)
		log.Println(msg)
		return
	}

	url := fmt.Sprintf("%s?part=%s&%s=%s&key=%s", youtubeAPI + endpoint, part, videoIdParam, videoID, apiKey)
	resp, err := http.Get(url)
	if err != nil {
		msg := "Failed to fetch video info: " + err.Error()
		http.Error(w, msg, http.StatusInternalServerError)
		log.Println(msg)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		msg := "YouTube API error: " + resp.Status
		http.Error(w, msg, http.StatusBadGateway)
		log.Println(msg)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	io.Copy(w, resp.Body)
}

/* routes */
func setupRoutesAPI() {
	http.HandleFunc("/api/details", func(w http.ResponseWriter, r *http.Request) {
		apiRequest(w, r, "videos", "id", "snippet,statistics,topicDetails")
	})

	http.HandleFunc("/api/comments", func(w http.ResponseWriter, r *http.Request) {
		apiRequest(w, r, "commentThreads", "videoId", "snippet,replies&maxResults=100")
	})
}