package download

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"os/exec"
	"regexp"
	"strings"

	"github.com/gocolly/colly"
	"github.com/joho/godotenv"
)

var ()

const (
	HOST_URL   = "https://www.bilibili.com"
	API_PREURL = "https://api.bilibili.com/x/web-interface/view?bvid="
	VID_PREURL = "https://www.bilibili.com/video/"
)

func MusicUrl(bv string) (url_list []string) {
	collector := colly.NewCollector()
	collector.OnResponse(func(r *colly.Response) {
		var (
			rtext string
			rtemp string
			rjson map[string]interface{}
			re    *regexp.Regexp
			// url_list []string
		)
		rtext = string(r.Body)
		re, _ = regexp.Compile(`<script>window.__playinfo__=(.*?)</script>`)
		rtemp = re.FindAllString(rtext, 1)[0]
		re, _ = regexp.Compile(`<script>window.__playinfo__=|</script>`)
		rtemp = re.ReplaceAllString(rtemp, "")
		json.Unmarshal([]byte(rtemp), &rjson)

		url_list = append(url_list, fmt.Sprintf("%v", rjson["data"].(map[string]interface{})["dash"].(map[string]interface{})["audio"].([]interface{})[0].(map[string]interface{})["baseUrl"].(string)))
		url_list = append(url_list, fmt.Sprintf("%v", rjson["data"].(map[string]interface{})["dash"].(map[string]interface{})["audio"].([]interface{})[0].(map[string]interface{})["base_url"].(string)))
		for _, url := range rjson["data"].(map[string]interface{})["dash"].(map[string]interface{})["audio"].([]interface{})[0].(map[string]interface{})["backupUrl"].([]interface{}) {
			url_list = append(url_list, fmt.Sprintf("%v", url))
		}
		// fmt.Println(len(url_list))

	})
	collector.Visit(VID_PREURL + bv)
	return url_list
}

func MusicDownload(url_list []string, title string) bool {
	godotenv.Load()
	result := false

	title = strings.Replace(title, "/", "&", -1)
	title = strings.Replace(title, "\"", "'", -1)

	for _, url := range url_list {
		var (
			response *http.Response
			m4afile  *os.File
		)
		var (
			err1 error
			err2 error
			err3 error
		)
		for i := 0; i < 3; i++ {
			req, _ := http.NewRequest("GET", url, nil)
			req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3")
			req.Header.Set("Referer", HOST_URL)
			client := &http.Client{}
			response, err1 = client.Do(req)
			if err1 != nil {
				// fmt.Println("Get url error")
				continue
			}
			break
		}
		defer response.Body.Close()
		if _, direrr := os.Stat("temp/"); os.IsNotExist(direrr) {
			os.Mkdir("temp/", 0755)
		}
		if _, direrr := os.Stat("music/"); os.IsNotExist(direrr) {
			os.Mkdir("music/", 0755)
		}
		os.Chdir("temp/")
		m4afile, err2 = os.Create(title + ".m4a")
		// return true
		if err2 != nil {
			fmt.Println("Create file error")
		}
		defer m4afile.Close()

		_, err3 = io.Copy(m4afile, response.Body)
		if err3 != nil {
			fmt.Println("Copy file error")
			continue
		}
		fmt.Println(title)
		// cmd := exec.Command(`ffmpeg`, `-i`, "\""+title+".m4a"+"\"", `-vn`, `-ar`, `44100`, `-ac`, `2`, `-ab`, `192k`, `-f`, `mp3`, "\""+"../music"+title+".mp3"+"\"")
		cmd := exec.Command("bash", "../download/convert.sh", title, os.Getenv("DOWNLOAD_PATH"))
		err := cmd.Run()
		if err != nil {
			fmt.Println("Convert error")
			fmt.Println(err)
			os.Remove(title + ".m4a")
			break
		}
		os.Remove(title + ".m4a")
		result = true
		break
	}
	os.Chdir("../")
	return result
}

func MusicInfo(bv string) (info map[string]interface{}) {
	info = make(map[string]interface{})
	collector := colly.NewCollector()
	collector.OnResponse(func(r *colly.Response) {
		var (
			rtext string
			rjson map[string]interface{}
		)
		rtext = string(r.Body)
		json.Unmarshal([]byte(rtext), &rjson)
		// fmt.Println(rjson)

		page := int(rjson["data"].(map[string]interface{})["videos"].(float64))
		if page == 1 {
			info["isSingle"] = true
			info["videos"] = make(map[int]interface{})
			info["videos"].(map[int]interface{})[1] = map[string]interface{}{"title": rjson["data"].(map[string]interface{})["title"].(string), "cover": rjson["data"].(map[string]interface{})["pic"].(string), "duration": int(rjson["data"].(map[string]interface{})["duration"].(float64))}
		} else {
			info["isSingle"] = false
			info["videos"] = make(map[int]interface{})
			pages := rjson["data"].(map[string]interface{})["pages"].([]interface{})
			for page, videoInfo := range pages {
				info["videos"].(map[int]interface{})[page+1] = map[string]interface{}{"title": videoInfo.(map[string]interface{})["part"].(string), "cover": rjson["data"].(map[string]interface{})["pic"].(string), "duration": int(videoInfo.(map[string]interface{})["duration"].(float64))}
			}
		}
	})
	collector.Visit(API_PREURL + bv)
	return info
}