package universal

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

	"github.com/debridmediamanager.com/zurg/internal/config"
	"github.com/debridmediamanager.com/zurg/internal/dav"
	intHttp "github.com/debridmediamanager.com/zurg/internal/http"
	"github.com/debridmediamanager.com/zurg/internal/torrent"
	zurghttp "github.com/debridmediamanager.com/zurg/pkg/http"
	"github.com/debridmediamanager.com/zurg/pkg/logutil"
	"github.com/hashicorp/golang-lru/v2/expirable"
	"go.uber.org/zap"
)

// HandleGetRequest handles a GET request universally for both WebDAV and HTTP
func HandleGetRequest(w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface, cache *expirable.LRU[string, string]) {
	log := logutil.NewLogger().Named("uniget")

	requestPath := path.Clean(r.URL.Path)
	isDav := true
	if strings.Contains(requestPath, "/http") {
		requestPath = strings.Replace(requestPath, "/http", "/", 1)
		isDav = false
	}
	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) <= 3 {
		if isDav {
			dav.HandlePropfindRequest(w, r, t, c)
		} else {
			intHttp.HandleDirectoryListing(w, r, t, c)
		}
		return
	}
	if data, exists := cache.Get(requestPath); exists {
		streamFileToResponse(data, w, r, t, c, log)
		return
	}

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

	torrent, _ := t.TorrentMap.Get(accessKey)
	if torrent == nil {
		log.Errorf("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.Errorf("Cannot find file from path %s", requestPath)
		http.Error(w, "File not found", http.StatusNotFound)
		return
	}
	if file.Link == "" {
		// This is a dead file, serve an alternate file
		log.Errorf("File %s is no longer available", filename)
		streamErrorVideo("https://www.youtube.com/watch?v=bGTqwt6vdcY", w, r, t, c, log)
		return
	}
	link := file.Link

	resp := t.UnrestrictUntilOk(link)
	if resp == nil {
		log.Errorf("The link cannot be unrestricted, file %s is no longer available", file.Path)
		// TODO: maybe repair the torrent?
		streamErrorVideo("https://www.youtube.com/watch?v=gea_FJrtFVA", w, r, t, c, log)
		return
	} else if resp.Filename != filename {
		actualExt := filepath.Ext(resp.Filename)
		expectedExt := filepath.Ext(filename)
		if actualExt != expectedExt && resp.Streamable != 1 {
			log.Errorf("File extension mismatch: %s and %s", filename, resp.Filename)
			streamErrorVideo("https://www.youtube.com/watch?v=t9VgOriBHwE", w, r, t, c, log)
			return
		} else {
			log.Errorf("Filename mismatch: %s and %s", filename, resp.Filename)
		}
	}
	cache.Add(requestPath, resp.Download)
	streamFileToResponse(resp.Download, w, r, t, c, log)
}

func streamFileToResponse(url string, w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface, log *zap.SugaredLogger) {
	// Create a new request for the file download.
	req, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		log.Errorf("Error creating new request: %v", err)
		streamErrorVideo("https://www.youtube.com/watch?v=H3NSrObyAxM", w, r, t, c, log)
		return
	}

	// copy range header if it exists
	if r.Header.Get("Range") != "" {
		req.Header.Add("Range", r.Header.Get("Range"))
	}

	// Create a custom HTTP client with a timeout.
	client := zurghttp.NewHTTPClient(c.GetToken(), 10)

	resp, err := client.Do(req)
	if err != nil {
		log.Errorf("Error downloading file %v", err)
		streamErrorVideo("https://www.youtube.com/watch?v=FSSd8cponAA", w, r, t, c, log)
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusPartialContent {
		log.Errorf("Received a nonOK status code %d", resp.StatusCode)
		streamErrorVideo("https://www.youtube.com/watch?v=BcseUxviVqE", w, r, t, c, log)
		return
	}

	for k, vv := range resp.Header {
		for _, v := range vv {
			w.Header().Add(k, v)
		}
	}

	buf := make([]byte, c.GetNetworkBufferSize())
	io.CopyBuffer(w, resp.Body, buf)
}

func streamErrorVideo(link string, w http.ResponseWriter, r *http.Request, t *torrent.TorrentManager, c config.ConfigInterface, log *zap.SugaredLogger) {
	resp := t.UnrestrictUntilOk(link)
	if resp == nil {
		http.Error(w, "REAL-DEBRID IS DOWN", http.StatusInternalServerError)
		return
	}
	streamFileToResponse(resp.Download, w, r, t, c, log)
}