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
	api        *realdebrid.RealDebrid
	workerPool *ants.Pool
	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, api *realdebrid.RealDebrid, workerPool *ants.Pool, log *logutil.Logger) {
	hs := &Handlers{
		downloader: downloader,
		torMgr:     torMgr,
		cfg:        cfg,
		api:        api,
		workerPool: workerPool,
		log:        log,
	}

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

	router.Get("/", hs.handleHome)
	router.Post("/reboot/worker", hs.handleRebootWorkerPool)
	router.Post("/reboot/refresh", hs.handleRebootRefreshWorker)
	router.Post("/reboot/repair", hs.handleRebootRepairWorker)
	router.Post("/remount/downloads", hs.handleRemountDownloads)
	// version
	router.Get(fmt.Sprintf("/{mountType}/%s", version.FILE), hs.handleVersionFile)
	router.Head(fmt.Sprintf("/{mountType}/%s", version.FILE), hs.handleCheckVersionFile)
	// download
	router.Get(fmt.Sprintf("/{mountType}/%s/{filename}", config.DOWNLOADS), hs.handleDownloadLink)
	router.Head(fmt.Sprintf("/{mountType}/%s/{filename}", config.DOWNLOADS), hs.handleCheckDownloadLink)
	// file
	router.Get("/{mountType}/{directory}/{torrent}/{filename}", hs.handleDownloadFile)
	router.Head("/{mountType}/{directory}/{torrent}/{filename}", hs.handleCheckFile)

	router.Get("/http/", hs.handleHttpRoot)
	router.Get(fmt.Sprintf("/http/%s/", config.DOWNLOADS), hs.handleHttpDownloadsList)
	router.Get("/http/{directory}/", hs.handleHttpTorrentsList)
	router.Get("/http/{directory}/{torrent}/", hs.handleHttpFilesList)

	router.Get("/dav/", hs.handleDavRoot)
	router.Get(fmt.Sprintf("/dav/%s/", config.DOWNLOADS), hs.handleDavDownloadsList)
	router.Get("/dav/{directory}/", hs.handleDavTorrentsList)
	router.Get("/dav/{directory}/{torrent}/", hs.handleDavFilesList)
	router.MethodFunc("PROPFIND", "/dav/", hs.handleDavRoot)
	router.MethodFunc("PROPFIND", fmt.Sprintf("/dav/%s/", config.DOWNLOADS), hs.handleDavDownloadsList)
	router.MethodFunc("PROPFIND", "/dav/{directory}/", hs.handleDavTorrentsList)
	router.MethodFunc("PROPFIND", "/dav/{directory}/{torrent}/", hs.handleDavFilesList)
	router.MethodFunc("PROPFIND", "/dav/{directory}/{torrent}/{filename}", hs.davCheckSingleFileHandler)

	router.Get("/infuse/", hs.handleInfuseRoot)
	router.Get(fmt.Sprintf("/infuse/%s/", config.DOWNLOADS), hs.handleInfuseDownloadsList)
	router.Get("/infuse/{directory}/", hs.handleInfuseTorrentsList)
	router.Get("/infuse/{directory}/{torrent}/", hs.handleInfuseFilesList)
	router.MethodFunc("PROPFIND", "/infuse/", hs.handleInfuseRoot)
	router.MethodFunc("PROPFIND", fmt.Sprintf("/infuse/%s/", config.DOWNLOADS), hs.handleInfuseDownloadsList)
	router.MethodFunc("PROPFIND", "/infuse/{directory}/", hs.handleInfuseTorrentsList)
	router.MethodFunc("PROPFIND", "/infuse/{directory}/{torrent}/", hs.handleInfuseFilesList)

	// note: reused handlers for dav and infuse
	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 %v", req.Method, req.URL, req.Header)
		http.Error(resp, "Method not allowed", http.StatusMethodNotAllowed)
	})
}

// handle root request

func (hs *Handlers) innerRootHandler(resp http.ResponseWriter, req *http.Request, handleFunc func(*torrent.TorrentManager) ([]byte, error), contentType string) {
	out, err := handleFunc(hs.torMgr)
	if err != nil && strings.Contains(contentType, "xml") {
		hs.log.Debugf("Not implemented: %s %s", req.Method, req.URL)
		resp.WriteHeader(http.StatusNotImplemented)
		resp.Write([]byte("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:error xmlns:d=\"DAV:\" xmlns:s=\"DAV\"><s:exception>NotImplemented</s:exception><s:message>Not Implemented Method</s:message></d:error>"))
		return
	} else if err != nil {
		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) handleHttpRoot(resp http.ResponseWriter, req *http.Request) {
	hs.innerRootHandler(resp, req, intHttp.ServeRootDirectory, "text/html; charset=\"utf-8\"")
}

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

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

// handle torrent list request

func (hs *Handlers) innerTorrentsListHandler(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 && strings.Contains(contentType, "xml") {
		hs.log.Debugf("Not implemented: %s %s", req.Method, req.URL)
		resp.WriteHeader(http.StatusNotImplemented)
		resp.Write([]byte("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:error xmlns:d=\"DAV:\" xmlns:s=\"DAV\"><s:exception>NotImplemented</s:exception><s:message>Not Implemented Method</s:message></d:error>"))
		return
	} else if err != nil {
		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) handleHttpTorrentsList(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	handlerFunc := intHttp.ServeTorrentsList
	if directory == config.DOWNLOADS {
		handlerFunc = func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
			return intHttp.ServeDownloadsList(torMgr)
		}
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavTorrentsList(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	handlerFunc := dav.ServeTorrentsList
	if directory == config.DOWNLOADS {
		handlerFunc = func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
			return dav.ServeDownloadsList(torMgr)
		}
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseTorrentsList(resp http.ResponseWriter, req *http.Request) {
	directory, err := url.PathUnescape(chi.URLParam(req, "directory"))
	if err != nil {
		directory = chi.URLParam(req, "directory")
	}
	handlerFunc := dav.ServeTorrentsListForInfuse
	if directory == config.DOWNLOADS {
		handlerFunc = func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
			return dav.ServeDownloadsListForInfuse(torMgr)
		}
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "text/xml; charset=\"utf-8\"")
}

// handle files list request

func (hs *Handlers) innerFilesListHandler(resp http.ResponseWriter, req *http.Request, handleFunc func(string, string, *torrent.TorrentManager) ([]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)
	if err != nil && strings.Contains(contentType, "xml") {
		hs.log.Debugf("Not implemented: %s %s", req.Method, req.URL)
		resp.WriteHeader(http.StatusNotImplemented)
		resp.Write([]byte("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:error xmlns:d=\"DAV:\" xmlns:s=\"DAV\"><s:exception>NotImplemented</s:exception><s:message>Not Implemented Method</s:message></d:error>"))
		return
	} else if err != nil {
		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) handleHttpFilesList(resp http.ResponseWriter, req *http.Request) {
	hs.innerFilesListHandler(resp, req, intHttp.ServeFilesList, "text/html; charset=\"utf-8\"")
}

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

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

// handle downloads list request

func (hs *Handlers) handleHttpDownloadsList(resp http.ResponseWriter, req *http.Request) {
	handlerFunc := func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
		return intHttp.ServeDownloadsList(torMgr)
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "text/html; charset=\"utf-8\"")
}

func (hs *Handlers) handleDavDownloadsList(resp http.ResponseWriter, req *http.Request) {
	handlerFunc := func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
		return dav.ServeDownloadsList(torMgr)
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "text/xml; charset=\"utf-8\"")
}

func (hs *Handlers) handleInfuseDownloadsList(resp http.ResponseWriter, req *http.Request) {
	handlerFunc := func(_ string, torMgr *torrent.TorrentManager) ([]byte, error) {
		return dav.ServeDownloadsListForInfuse(torMgr)
	}
	hs.innerTorrentsListHandler(resp, req, handlerFunc, "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) davCheckSingleFileHandler(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.Filename, download.Download, resp, req, hs.torMgr, 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)
}