package handlers

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

	"github.com/debridmediamanager/zurg/internal/config"
	"github.com/debridmediamanager/zurg/internal/dav"
	intHttp "github.com/debridmediamanager/zurg/internal/http"
	"github.com/debridmediamanager/zurg/internal/torrent"
	"github.com/debridmediamanager/zurg/internal/universal"
	"github.com/debridmediamanager/zurg/internal/version"
	"github.com/debridmediamanager/zurg/pkg/logutil"
	"github.com/debridmediamanager/zurg/pkg/realdebrid"
	"github.com/go-chi/chi/v5"
	"github.com/panjf2000/ants/v2"
)

type Handlers struct {
	downloader *universal.Downloader
	torMgr     *torrent.TorrentManager
	cfg        config.ConfigInterface
	rd         *realdebrid.RealDebrid
	workerPool *ants.Pool
	hosts      []string
	log        *logutil.Logger
}

func init() {
	chi.RegisterMethod("PROPFIND")
	chi.RegisterMethod("MKCOL")
	chi.RegisterMethod("MOVE")
}

func AttachHandlers(router *chi.Mux, downloader *universal.Downloader, torMgr *torrent.TorrentManager, cfg config.ConfigInterface, rd *realdebrid.RealDebrid, workerPool *ants.Pool, hosts []string, log *logutil.Logger) {
	hs := &Handlers{
		downloader: downloader,
		torMgr:     torMgr,
		cfg:        cfg,
		rd:         rd,
		workerPool: workerPool,
		hosts:      hosts,
		log:        log,
	}

	if cfg.GetUsername() != "" {
		router.Use(hs.basicAuth)
	}
	router.Use(hs.options)
	router.NotFound(hs.handleNotFound)

	router.Get("/", hs.handleHome)
	router.Get("/stats", hs.handleHomeJson)
	// debug
	router.Post("/reboot-worker", hs.handleRebootWorkerPool)
	router.Post("/reboot-refresh", hs.handleRebootRefreshWorker)
	router.Post("/reboot-repair", hs.handleRebootRepairWorker)
	router.Post("/downloads/remount", hs.handleRemountDownloads)
	// utils
	router.Post("/torrents/dump", hs.handleDumpTorrents)
	router.Post("/torrents/analyze", hs.handleAnalyzeTorrents)
	router.Post("/torrents/repair", hs.handleTriggerRepairAll)
	router.Post("/torrents/reset-repair-state", hs.handleResetRepairState)
	// version
	router.Get("/{mountType}/version.txt", hs.handleVersionFile)
	router.Head("/{mountType}/version.txt", hs.handleCheckVersionFile)
	// download
	router.Get("/{mountType}/__downloads__/{filename}", hs.handleDownloadLink)
	router.Head("/{mountType}/__downloads__/{filename}", hs.handleCheckDownloadLink)
	// file
	router.Get("/{mountType}/{directory}/{torrent}/{filename}", hs.handleDownloadFile)
	router.Head("/{mountType}/{directory}/{torrent}/{filename}", hs.handleCheckFile)

	// http
	router.Get("/http/", hs.handleHttpRootDirectory)
	router.Get("/http/__downloads__/", hs.handleHttpDownloads)
	router.Get("/http/{directory}/", hs.handleHttpGroupDirectory)
	router.Get("/http/{directory}/{torrent}/", hs.handleHttpTorrentFiles)

	// dav
	router.Get("/dav/", hs.handleDavRootDirectory)
	router.Get("/dav/__downloads__/", hs.handleDavDownloads)
	router.Get("/dav/{directory}/", hs.handleDavGroupDirectory)
	router.Get("/dav/{directory}/{torrent}/", hs.handleDavTorrentFiles)

	router.MethodFunc("PROPFIND", "/dav/", hs.handleDavRootDirectory)
	router.MethodFunc("PROPFIND", "/dav/__downloads__/", hs.handleDavDownloads)
	router.MethodFunc("PROPFIND", "/dav/{directory}/", hs.handleDavGroupDirectory)
	router.MethodFunc("PROPFIND", "/dav/{directory}/{torrent}/", hs.handleDavTorrentFiles)

	// infuse
	router.Get("/infuse/", hs.handleInfuseRootDirectory)
	router.Get("/infuse/__downloads__/", hs.handleInfuseDownloads)
	router.Get("/infuse/{directory}/", hs.handleInfuseGroupDirectory)
	router.Get("/infuse/{directory}/{torrent}/", hs.handleInfuseTorrentFiles)

	router.MethodFunc("PROPFIND", "/infuse/", hs.handleInfuseRootDirectory)
	router.MethodFunc("PROPFIND", "/infuse/__downloads__/", hs.handleInfuseDownloads)
	router.MethodFunc("PROPFIND", "/infuse/{directory}/", hs.handleInfuseGroupDirectory)
	router.MethodFunc("PROPFIND", "/infuse/{directory}/{torrent}/", hs.handleInfuseTorrentFiles)

	// vidhub
	router.Get("/vidhub/", hs.handleVidHubRootDirectory)
	router.Get("/vidhub/__downloads__/", hs.handleVidHubDownloads)
	router.Get("/vidhub/{directory}/", hs.handleVidHubGroupDirectory)
	router.Get("/vidhub/{directory}/{torrent}/", hs.handleVidHubTorrentFiles)

	router.MethodFunc("PROPFIND", "/vidhub/", hs.handleVidHubRootDirectory)
	router.MethodFunc("PROPFIND", "/vidhub/__downloads__", hs.handleVidHubDownloads)
	router.MethodFunc("PROPFIND", "/vidhub/{directory}", hs.handleVidHubGroupDirectory)
	router.MethodFunc("PROPFIND", "/vidhub/{directory}/{torrent}", hs.handleVidHubTorrentFiles)

	// note: reused handlers for dav and infuse
	router.MethodFunc("PROPFIND", "/{mountType}/{directory}/{torrent}/{filename}", hs.checkSingleFileHandler)
	router.Delete("/{mountType}/{directory}/{torrent}/", hs.deleteTorrentHandler)
	router.Delete("/{mountType}/{directory}/{torrent}/{filename}", hs.deleteFileHandler)
	router.MethodFunc("MKCOL", "/{mountType}/{directory}/{torrent}/", hs.mkcolTorrentHandler)
	router.MethodFunc("MOVE", "/{mountType}/{directory}/{torrent}/", hs.moveTorrentHandler)
	router.MethodFunc("MOVE", "/{mountType}/{directory}/{torrent}/{filename}", hs.moveFileHandler)

	// logs route
	router.Get("/logs", hs.logsHandler)
	router.Get("/logs/", hs.logsHandler)
	router.Get("/logs/upload", hs.uploadLogsHandler)
	router.Get("/logs/upload/", hs.uploadLogsHandler)

	router.MethodNotAllowed(func(resp http.ResponseWriter, req *http.Request) {
		hs.log.Debugf("Method not allowed: %s %s (error=%v)", req.Method, req.URL, req.Header)
		http.Error(resp, "Method not allowed", http.StatusMethodNotAllowed)
	})
}

// handle root request

func (hs *Handlers) innerRootDirectoryHandler(resp http.ResponseWriter, req *http.Request, handleFunc func(*torrent.TorrentManager) ([]byte, error), contentType string) {
	out, err := handleFunc(hs.torMgr)
	if err != nil {
		hs.log.Errorf("Not found: %s %s (error=%v)", req.Method, req.URL, err)
		http.NotFound(resp, req)
		return
	}
	resp.Header().Set("Content-Type", contentType)
	if strings.Contains(contentType, "xml") {
		resp.WriteHeader(http.StatusMultiStatus)
	} else {
		resp.WriteHeader(http.StatusOK)
	}
	resp.Write(out)
}

func (hs *Handlers) handleHttpRootDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerRootDirectoryHandler(resp, req, intHttp.ServeRootDirectory, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavRootDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerRootDirectoryHandler(resp, req, dav.ServeRootDirectoryForDav, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseRootDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerRootDirectoryHandler(resp, req, dav.ServeRootDirectoryForInfuse, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleVidHubRootDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerRootDirectoryHandler(resp, req, dav.ServeRootDirectoryForVidHub, "text/xml; charset=\"utf-8\"")
}

// handle torrent list request

func (hs *Handlers) innerGroupDirectoryHandler(resp http.ResponseWriter, req *http.Request, handleFunc func(string, *torrent.TorrentManager) ([]byte, error), contentType string) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	out, err := handleFunc(directory, hs.torMgr)
	if err != nil {
		hs.log.Errorf("Not found: %s %s (error=%v)", req.Method, req.URL, err)
		http.NotFound(resp, req)
		return
	}
	resp.Header().Set("Content-Type", contentType)
	if strings.Contains(contentType, "xml") {
		resp.WriteHeader(http.StatusMultiStatus)
	} else {
		resp.WriteHeader(http.StatusOK)
	}
	resp.Write(out)
}

func (hs *Handlers) handleHttpGroupDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, intHttp.ServeGroupDirectory, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavGroupDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeGroupDirectoryForDav, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseGroupDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeGroupDirectoryForInfuse, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleVidHubGroupDirectory(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeGroupDirectoryForVidHub, "text/xml; charset=\"utf-8\"")
}

// handle files list request

func (hs *Handlers) innerTorrentFilesHandler(resp http.ResponseWriter, req *http.Request, handleFunc func(string, string, *torrent.TorrentManager, bool) ([]byte, error), contentType string) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	out, err := handleFunc(directory, torrentName, hs.torMgr, hs.cfg.ShouldHideBrokenTorrents())
	if err != nil {
		hs.log.Errorf("Not found: %s %s (error=%v)", req.Method, req.URL, err)
		http.NotFound(resp, req)
		return
	}
	resp.Header().Set("Content-Type", contentType)
	if strings.Contains(contentType, "xml") {
		resp.WriteHeader(http.StatusMultiStatus)
	} else {
		resp.WriteHeader(http.StatusOK)
	}
	resp.Write(out)
}

func (hs *Handlers) handleHttpTorrentFiles(resp http.ResponseWriter, req *http.Request) {
	hs.innerTorrentFilesHandler(resp, req, intHttp.ServeTorrentFiles, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavTorrentFiles(resp http.ResponseWriter, req *http.Request) {
	hs.innerTorrentFilesHandler(resp, req, dav.ServeTorrentFilesForDav, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseTorrentFiles(resp http.ResponseWriter, req *http.Request) {
	hs.innerTorrentFilesHandler(resp, req, dav.ServeTorrentFilesForInfuse, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleVidHubTorrentFiles(resp http.ResponseWriter, req *http.Request) {
	hs.innerTorrentFilesHandler(resp, req, dav.ServeTorrentFilesForVidHub, "text/xml; charset=\"utf-8\"")
}

// handle downloads list request

func (hs *Handlers) handleHttpDownloads(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, intHttp.ServeDownloads, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavDownloads(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeDownloadsForDav, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseDownloads(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeDownloadsForInfuse, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleVidHubDownloads(resp http.ResponseWriter, req *http.Request) {
	hs.innerGroupDirectoryHandler(resp, req, dav.ServeDownloadsForVidHub, "text/xml; charset=\"utf-8\"")
}

// handle delete request

func (hs *Handlers) deleteFileHandler(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	fileName, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		fileName = chi.URLParam(req, "filename")
	}
	if dav.HandleDeleteFile(directory, torrentName, fileName, hs.torMgr) != nil {
		http.NotFound(resp, req)
		return
	}
	resp.WriteHeader(http.StatusNoContent)
}

func (hs *Handlers) deleteTorrentHandler(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	if dav.HandleDeleteTorrent(directory, torrentName, hs.torMgr) != nil {
		http.NotFound(resp, req)
		return
	}
	resp.WriteHeader(http.StatusNoContent)
}

// other handlers

func (hs *Handlers) checkSingleFileHandler(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	fileName, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		fileName = chi.URLParam(req, "filename")
	}
	out, err := dav.HandleSingleFile(directory, torrentName, fileName, hs.torMgr)
	if err != nil {
		http.NotFound(resp, req)
		return
	}
	resp.Header().Set("Content-Type", "text/xml; charset=\"utf-8\"")
	resp.WriteHeader(http.StatusOK)
	resp.Write(out)
}

func (hs *Handlers) mkcolTorrentHandler(resp http.ResponseWriter, req *http.Request) {
	resp.WriteHeader(http.StatusNoContent)
}

func (hs *Handlers) moveFileHandler(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	fileName, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		fileName = chi.URLParam(req, "filename")
	}
	newName := req.Header.Get("Destination")
	newName = filepath.Base(newName)
	if dav.HandleRenameFile(directory, torrentName, fileName, newName, hs.torMgr) != nil {
		http.NotFound(resp, req)
		return
	}
	resp.WriteHeader(http.StatusNoContent)
}

func (hs *Handlers) moveTorrentHandler(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	newName := req.Header.Get("Destination")
	newName = filepath.Base(newName)
	if dav.HandleRenameTorrent(directory, torrentName, newName, hs.torMgr) != nil {
		http.NotFound(resp, req)
		return
	}
	resp.WriteHeader(http.StatusNoContent)
}

// universal handlers

func (hs *Handlers) handleDownloadFile(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	fileName, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		fileName = chi.URLParam(req, "filename")
	}
	hs.downloader.DownloadFile(directory, torrentName, fileName, resp, req, hs.torMgr, hs.cfg, hs.log)
}

func (hs *Handlers) handleDownloadLink(resp http.ResponseWriter, req *http.Request) {
	filename, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		filename = chi.URLParam(req, "filename")
	}
	if download, ok := hs.torMgr.DownloadMap.Get(filename); ok {
		hs.downloader.DownloadLink(download, resp, req, hs.cfg, hs.log)
	} else {
		http.NotFound(resp, req)
	}
}

func (hs *Handlers) handleCheckFile(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	torrentName, err := url.PathUnescape(chi.URLParam(req, "torrent"))
	if err != nil {
		torrentName = chi.URLParam(req, "torrent")
	}
	fileName, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		fileName = chi.URLParam(req, "filename")
	}
	universal.CheckFile(directory, torrentName, fileName, resp, req, hs.torMgr, hs.log)
}

func (hs *Handlers) handleCheckDownloadLink(resp http.ResponseWriter, req *http.Request) {
	filename, err := url.PathUnescape(chi.URLParam(req, "filename"))
	if err != nil {
		filename = chi.URLParam(req, "filename")
	}
	if download, ok := hs.torMgr.DownloadMap.Get(filename); ok {
		universal.CheckDownloadLink(download, resp, req, hs.torMgr, hs.log)
	} else {
		http.NotFound(resp, req)
	}
}

// handle version file request

func (hs *Handlers) handleVersionFile(resp http.ResponseWriter, req *http.Request) {
	out, _ := version.GetFile()
	resp.Header().Set("Content-Type", "text/plain; charset=\"utf-8\"")
	resp.WriteHeader(http.StatusOK)
	resp.Write(out)
}

func (hs *Handlers) handleCheckVersionFile(resp http.ResponseWriter, req *http.Request) {
	universal.CheckVersionFile(resp, req, hs.torMgr, hs.log)
}

// logs handler

func (hs *Handlers) logsHandler(resp http.ResponseWriter, req *http.Request) {
	logs, err := hs.log.GetLogsFromFile()
	if err != nil {
		http.Error(resp, err.Error(), http.StatusInternalServerError)
		return
	}
	fmt.Fprint(resp, logs)
}

func (hs *Handlers) uploadLogsHandler(resp http.ResponseWriter, req *http.Request) {
	url, err := hs.log.UploadLogFile()
	if err != nil {
		http.Error(resp, err.Error(), http.StatusInternalServerError)
		return
	}
	http.Redirect(resp, req, url, http.StatusFound)
}

func (hs *Handlers) handleNotFound(resp http.ResponseWriter, req *http.Request) {
	if hs.cfg.ShouldLogRequests() {
		hs.log.Debugf("Not found: %s %s", req.Method, req.URL)
	}
	http.NotFound(resp, req)
}