package dav

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

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

// HandleGetRequest handles a GET request to a file
func HandleGetRequest(w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface, cache *expirable.LRU[string, string]) {
	requestPath := path.Clean(r.URL.Path)
	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.Println("Invalid url", requestPath)
		// http.Error(w, "Cannot find file", http.StatusNotFound)
		HandlePropfindRequest(w, r, t, c, cache)
		return
	}
	if data, exists := cache.Get(requestPath); exists {
		http.Redirect(w, r, data, http.StatusFound)
		return
	}
	// Get the last two segments
	baseDirectory := segments[len(segments)-3]
	torrentName := segments[len(segments)-2]
	filename := segments[len(segments)-1]

	torrents := findAllTorrentsWithName(t, baseDirectory, torrentName)
	if torrents == nil {
		log.Println("Cannot find torrent", torrentName)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}

	filenameV2, linkFragment := davextra.ExtractLinkFragment(filename)
	torrent, file := getFile(torrents, filenameV2, linkFragment)
	if file == nil {
		log.Println("Cannot find file", filename)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}
	if file.Link == "" {
		log.Println("Link not found", filename)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}
	link := file.Link

	unrestrictFn := func() (*realdebrid.UnrestrictResponse, error) {
		return realdebrid.UnrestrictLink(c.GetToken(), link)
	}
	resp := realdebrid.RetryUntilOk(unrestrictFn)
	if resp == nil {
		log.Println("Cannot unrestrict link", link, filenameV2)
		t.MarkFileAsDeleted(torrent, file)
		http.Error(w, "Cannot find file", http.StatusNotFound)
		return
	}
	if resp.Filename != filenameV2 {
		actualExt := filepath.Ext(resp.Filename)
		expectedExt := filepath.Ext(filenameV2)
		if actualExt != expectedExt {
			log.Println("File extension mismatch", resp.Filename, filenameV2)
		} else {
			log.Println("Filename mismatch", resp.Filename, filenameV2)
		}
	}
	cache.Add(requestPath, resp.Download)
	http.Redirect(w, r, resp.Download, http.StatusFound)
}

// getFile finds a link by a fragment, it might be wrong
func getFile(torrents []torrent.Torrent, filename, fragment string) (*torrent.Torrent, *torrent.File) {
	for t := range torrents {
		for f, file := range torrents[t].SelectedFiles {
			fname := filepath.Base(file.Path)
			if filename == fname && strings.HasPrefix(file.Link, fmt.Sprintf("https://real-debrid.com/d/%s", fragment)) {
				return &torrents[t], &torrents[t].SelectedFiles[f]
			}
		}
	}
	return nil, nil
}