package dav

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

	"github.com/debridmediamanager/zurg/internal/torrent"
	"github.com/debridmediamanager/zurg/pkg/dav"
	"go.uber.org/zap"
)

func HandlePropfindRequest(w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, log *zap.SugaredLogger) {
	requestPath := path.Clean(r.URL.Path)

	var output *string
	var err error

	filteredSegments := splitIntoSegments(requestPath)
	switch {
	case len(filteredSegments) == 0:
		output, err = handleListDirectories(w, t)
	case len(filteredSegments) == 1:
		output, err = handleListTorrents(w, requestPath, t)
	case len(filteredSegments) == 2:
		output, err = handleListFiles(w, requestPath, t)
	default:
		log.Warnf("Request %s %s not found", r.Method, requestPath)
		http.Error(w, "Not Found", http.StatusNotFound)
		return
	}

	if err != nil {
		if strings.Contains(err.Error(), "cannot find") {
			http.Error(w, "Not Found", http.StatusNotFound)
			return
		}
		log.Errorf("Error processing request: %v", err)
		http.Error(w, "Server error", http.StatusInternalServerError)
		return
	}

	if output != nil {
		w.Header().Set("Content-Type", "text/xml; charset=\"utf-8\"")
		w.WriteHeader(http.StatusOK)
		fmt.Fprint(w, *output)
	}
}

func handleListDirectories(w http.ResponseWriter, t *torrent.TorrentManager) (*string, error) {
	davDoc := "<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">"
	// initial response is the directory itself
	davDoc += dav.BaseDirectory("", "")

	directories := t.DirectoryMap.Keys()
	sort.Strings(directories)
	for _, directory := range directories {
		if strings.HasPrefix(directory, "int__") {
			continue
		}
		davDoc += dav.Directory(directory, "")
	}

	davDoc += "</d:multistatus>"
	return &davDoc, nil
}

func handleListTorrents(w http.ResponseWriter, requestPath string, t *torrent.TorrentManager) (*string, error) {
	basePath := path.Base(requestPath)
	_, ok := t.DirectoryMap.Get(basePath)
	if !ok {
		return nil, fmt.Errorf("cannot find directory %s", basePath)
	}

	resp, _ := t.ResponseCache.Get(basePath + ".dav")
	davDoc := resp.(string)

	return &davDoc, nil
}

func handleListFiles(w http.ResponseWriter, requestPath string, t *torrent.TorrentManager) (*string, error) {
	requestPath = strings.Trim(requestPath, "/")
	basePath := path.Base(path.Dir(requestPath))
	torrents, ok := t.DirectoryMap.Get(basePath)
	if !ok {
		return nil, fmt.Errorf("cannot find directory %s", basePath)
	}
	accessKey := path.Base(requestPath)
	tor, ok := torrents.Get(accessKey)
	if !ok {
		return nil, fmt.Errorf("cannot find torrent %s", accessKey)
	}

	davDoc := "<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">" + dav.BaseDirectory(requestPath, tor.LatestAdded)

	filenames := tor.SelectedFiles.Keys()
	sort.Strings(filenames)
	for _, filename := range filenames {
		file, _ := tor.SelectedFiles.Get(filename)
		if file == nil || !strings.HasPrefix(file.Link, "http") {
			continue
		}
		davDoc += dav.File(filename, file.Bytes, file.Ended)
	}

	davDoc += "</d:multistatus>"
	return &davDoc, nil
}