package dav

import (
	"encoding/xml"
	"fmt"
	"log"
	"net/http"
	"path"
	"strings"

	"github.com/debridmediamanager.com/zurg/internal/config"
	"github.com/debridmediamanager.com/zurg/internal/torrent"
	"github.com/debridmediamanager.com/zurg/pkg/dav"
)

// HandlePropfindRequest handles a PROPFIND request
func HandlePropfindRequest(w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface) {
	var output []byte
	var err error

	requestPath := path.Clean(r.URL.Path)
	pathSegments := strings.Split(requestPath, "/")

	// Remove empty segments caused by leading or trailing slashes
	filteredSegments := make([]string, 0, len(pathSegments))
	for _, segment := range pathSegments {
		if segment != "" {
			filteredSegments = append(filteredSegments, segment)
		}
	}

	switch len(filteredSegments) {
	case 0: // Just the root "/"
		output, err = handleRoot(w, r, c)
	case 1: // It's just the basedir e.g. "/basedir"
		output, err = handleListOfTorrents(requestPath, w, r, t, c)
	case 2: // It's a specific torrent under a basedir e.g. "/basedir/torrentname/"
		output, err = handleSingleTorrent(requestPath, w, r, t)
	default:
		// Handle any other paths, e.g., send a 404 Not Found response
		http.Error(w, "Not Found", http.StatusNotFound)
		return
	}
	if err != nil {
		log.Printf("Cannot marshal xml: %v\n", err.Error())
		http.Error(w, "Cannot read directory", http.StatusInternalServerError)
		return
	}
	if output != nil {
		w.Header().Set("Content-Type", "text/xml; charset=\"utf-8\"")
		w.WriteHeader(http.StatusMultiStatus)
		fmt.Fprintf(w, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n%s\n", output)
		return
	}
}

// handleRoot handles a PROPFIND request to the root directory
func handleRoot(w http.ResponseWriter, r *http.Request, c config.ConfigInterface) ([]byte, error) {
	var responses []dav.Response
	responses = append(responses, dav.Directory("/"))
	for _, directory := range c.GetDirectories() {
		responses = append(responses, dav.Directory(fmt.Sprintf("/%s", directory)))
	}
	rootResponse := dav.MultiStatus{
		XMLNS:    "DAV:",
		Response: responses,
	}
	return xml.MarshalIndent(rootResponse, "", "  ")
}

// handleListOfTorrents handles a PROPFIND request to the /torrents directory
func handleListOfTorrents(requestPath string, w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface) ([]byte, error) {
	basePath := path.Base(requestPath)

	found := false
	for _, directory := range c.GetDirectories() {
		if basePath == directory {
			found = true
		}
	}
	if !found {
		log.Println("Cannot find directory", requestPath)
		http.Error(w, "Cannot find directory", http.StatusNotFound)
		return nil, nil
	}

	torrents := t.GetByDirectory(basePath)
	resp, err := createMultiTorrentResponse(fmt.Sprintf("/%s", basePath), torrents)
	if err != nil {
		log.Printf("Cannot read directory (%s): %v\n", basePath, err.Error())
		http.Error(w, "Cannot read directory", http.StatusInternalServerError)
		return nil, nil
	}
	return xml.MarshalIndent(resp, "", "  ")
}

// handleSingleTorrent handles a PROPFIND request to a single torrent directory
func handleSingleTorrent(requestPath string, w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager) ([]byte, error) {
	basePath := path.Dir(requestPath)

	torrentName := path.Base(requestPath)
	sameNameTorrents := findAllTorrentsWithName(t, basePath, torrentName)
	if len(sameNameTorrents) == 0 {
		log.Println("Cannot find directory", requestPath)
		http.Error(w, "Cannot find directory", http.StatusNotFound)
		return nil, nil
	}
	var resp *dav.MultiStatus
	resp, err := createSingleTorrentResponse(fmt.Sprintf("/%s", basePath), sameNameTorrents, t)
	if err != nil {
		log.Printf("Cannot read directory (%s): %v\n", requestPath, err.Error())
		http.Error(w, "Cannot read directory", http.StatusInternalServerError)
		return nil, nil
	}
	return xml.MarshalIndent(resp, "", "  ")
}