package dav

import (
	"bytes"
	"fmt"
	"path/filepath"
	"sort"
	"strings"

	"github.com/debridmediamanager/zurg/internal/config"
	"github.com/debridmediamanager/zurg/internal/torrent"
	"github.com/debridmediamanager/zurg/internal/version"
	"github.com/debridmediamanager/zurg/pkg/dav"
)

func ServeRootDirectory(torMgr *torrent.TorrentManager) ([]byte, error) {
	var buf bytes.Buffer
	buf.WriteString("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">")
	buf.WriteString(dav.BaseDirectory("", ""))
	directories := torMgr.DirectoryMap.Keys()
	sort.Strings(directories)
	for _, directory := range directories {
		if strings.HasPrefix(directory, "int__") {
			continue
		}
		buf.WriteString(dav.Directory(directory, ""))
	}
	if torMgr.Config.EnableDownloadMount() {
		buf.WriteString(dav.Directory(config.DOWNLOADS, ""))
	}
	_, size := version.GetFile()
	buf.WriteString(dav.File(version.FILE, size, ""))
	buf.WriteString("</d:multistatus>")
	return buf.Bytes(), nil
}

func ServeTorrentsList(directory string, torMgr *torrent.TorrentManager) ([]byte, error) {
	torrents, ok := torMgr.DirectoryMap.Get(directory)
	if !ok {
		return nil, fmt.Errorf("cannot find directory %s", directory)
	}

	var buf bytes.Buffer
	buf.WriteString("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">")
	buf.WriteString(dav.BaseDirectory(directory, ""))
	torrentNames := torrents.Keys()
	sort.Strings(torrentNames)
	for _, torrentName := range torrentNames {
		tor, ok := torrents.Get(torrentName)
		if !ok || tor.AllInProgress() {
			continue
		}
		buf.WriteString(dav.Directory(torMgr.GetKey(tor), tor.Added))
	}
	buf.WriteString("</d:multistatus>")
	return buf.Bytes(), nil
}

func ServeFilesList(directory, torrentName string, torMgr *torrent.TorrentManager) ([]byte, error) {
	torrents, ok := torMgr.DirectoryMap.Get(directory)
	if !ok {
		return nil, fmt.Errorf("cannot find directory %s", directory)
	}
	tor, ok := torrents.Get(torrentName)
	if !ok {
		return nil, fmt.Errorf("cannot find torrent %s", torrentName)
	}

	dirCfg := torMgr.Config.(*config.ZurgConfigV1).GetDirectoryConfig(directory)
	biggestFileSize := int64(0)
	if dirCfg.OnlyShowTheBiggestFile {
		biggestFileSize = tor.ComputeBiggestFileSize()
	}

	var buf bytes.Buffer
	buf.WriteString("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">")
	buf.WriteString(dav.BaseDirectory(filepath.Join(directory, torMgr.GetKey(tor)), tor.Added))
	filenames := tor.SelectedFiles.Keys()
	sort.Strings(filenames)
	for _, filename := range filenames {
		file, ok := tor.SelectedFiles.Get(filename)
		if !ok || !strings.HasPrefix(file.Link, "http") {
			continue
		}
		if dirCfg.OnlyShowTheBiggestFile && file.Bytes < biggestFileSize {
			continue
		}
		if dirCfg.OnlyShowFilesWithSizeLte > 0 && file.Bytes > dirCfg.OnlyShowFilesWithSizeLte {
			continue
		}
		if dirCfg.OnlyShowFilesWithSizeGte > 0 && file.Bytes < dirCfg.OnlyShowFilesWithSizeGte {
			continue
		}
		buf.WriteString(dav.File(filename, file.Bytes, file.Ended))
	}
	buf.WriteString("</d:multistatus>")
	return buf.Bytes(), nil
}

func HandleSingleFile(directory, torrentName, fileName string, torMgr *torrent.TorrentManager) ([]byte, error) {
	torrents, ok := torMgr.DirectoryMap.Get(directory)
	if !ok {
		return nil, fmt.Errorf("cannot find directory %s", directory)
	}
	tor, ok := torrents.Get(torrentName)
	if !ok {
		return nil, fmt.Errorf("cannot find torrent %s", torrentName)
	}
	file, ok := tor.SelectedFiles.Get(fileName)
	if !ok || !strings.HasPrefix(file.Link, "http") {
		return nil, fmt.Errorf("cannot find file %s", fileName)
	}

	var buf bytes.Buffer
	buf.WriteString("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">")
	buf.WriteString(dav.BaseDirectory(filepath.Join(directory, torMgr.GetKey(tor)), tor.Added))
	buf.WriteString(dav.File(fileName, file.Bytes, file.Ended))
	buf.WriteString("</d:multistatus>")
	return buf.Bytes(), nil
}

func ServeDownloadsList(torMgr *torrent.TorrentManager) ([]byte, error) {
	var buf bytes.Buffer
	if !torMgr.Config.EnableDownloadMount() {
		buf.WriteString("Enable download mount in config to use this feature")
		return buf.Bytes(), nil
	}
	buf.WriteString("<?xml version=\"1.0\" encoding=\"utf-8\"?><d:multistatus xmlns:d=\"DAV:\">")
	buf.WriteString(dav.BaseDirectory(config.DOWNLOADS, ""))
	filenames := torMgr.DownloadMap.Keys()
	sort.Strings(filenames)
	for _, filename := range filenames {
		download, ok := torMgr.DownloadMap.Get(filename)
		if !ok || !strings.HasPrefix(download.Link, "http") {
			continue
		}
		buf.WriteString(dav.File(download.Filename, download.Filesize, download.Generated))
	}
	buf.WriteString("</d:multistatus>")
	return buf.Bytes(), nil
}