package universal

import (
	"fmt"
	"net/http"
	"path"
	"path/filepath"
	"strings"

	"github.com/debridmediamanager.com/zurg/internal/torrent"
	"github.com/debridmediamanager.com/zurg/pkg/logutil"
	"github.com/hashicorp/golang-lru/v2/expirable"
)

const (
	SPLIT_TOKEN = "$"
)

func HandleHeadRequest(w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, cache *expirable.LRU[string, string]) {
	log := logutil.NewLogger().Named("head")

	requestPath := path.Clean(r.URL.Path)
	requestPath = strings.Replace(requestPath, "/http", "", 1)
	if requestPath == "/favicon.ico" {
		return
	}

	segments := strings.Split(requestPath, "/")
	// If there are less than 3 segments, return an error or adjust as needed
	if len(segments) < 4 {
		log.Errorf("Request %s %s not supported yet", r.Method, r.URL.Path)
		http.Error(w, "Method not implemented", http.StatusMethodNotAllowed)
		return
	}

	if data, exists := cache.Get("head:" + requestPath); exists {
		splits := strings.Split(data, SPLIT_TOKEN)
		contentType := splits[0]
		contentLength := splits[1]
		lastModified := splits[2]
		w.Header().Set("Content-Type", contentType)
		w.Header().Set("Content-Length", contentLength)
		w.Header().Set("Last-Modified", lastModified)
		w.WriteHeader(http.StatusOK)
		return
	}

	baseDirectory := segments[len(segments)-3]
	accessKey := segments[len(segments)-2]
	filename := segments[len(segments)-1]

	torrents, ok := t.DirectoryMap.Get(baseDirectory)
	if !ok {
		log.Warnf("Cannot find directory %s", baseDirectory)
		http.Error(w, "File not found", http.StatusNotFound)
		return
	}
	torrent, ok := torrents.Get(accessKey)
	if !ok {
		log.Warnf("Cannot find torrent %s in the directory %s", accessKey, baseDirectory)
		http.Error(w, "File not found", http.StatusNotFound)
		return
	}

	file, _ := torrent.SelectedFiles.Get(filename)
	if file == nil {
		log.Warnf("Cannot find file from path %s", requestPath)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}
	if !strings.HasPrefix(file.Link, "http") {
		// This is a dead file, serve an alternate file
		log.Warnf("File %s is no longer available", filename)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}
	contentType := getContentMimeType(filename)
	contentLength := fmt.Sprintf("%d", file.Bytes)
	lastModified := file.Ended
	w.Header().Set("Content-Type", contentType)
	w.Header().Set("Content-Length", contentLength)
	w.Header().Set("Last-Modified", lastModified)
	cacheVal := strings.Join([]string{contentType, contentLength, lastModified}, SPLIT_TOKEN)
	cache.Add("head:"+requestPath, cacheVal)
	w.WriteHeader(http.StatusOK)
}

func getContentMimeType(filePath string) string {
	switch filepath.Ext(filePath) {
	case ".mkv":
		return "video/x-matroska"
	case ".mp4":
		return "video/mp4"
	case ".avi":
		return "video/x-msvideo"
	case ".mp3":
		return "audio/mpeg"
	case ".rar":
		return "application/x-rar-compressed"
	case ".zip":
		return "application/zip"
	case ".7z":
		return "application/x-7z-compressed"
	case ".srt":
		return "text/plain"
	default:
		return "application/octet-stream"
	}
}