package zfs

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"syscall"
	"time"

	"bazil.org/fuse"
	"bazil.org/fuse/fs"
	"github.com/debridmediamanager.com/zurg/internal/torrent"
	"github.com/debridmediamanager.com/zurg/internal/universal"
)

// define variable as rootObject id
const (
	ROOT      = 0
	DIRECTORY = 1
	TORRENT   = 2
	FILE      = 3
)

type Object struct {
	fs         *FS
	objType    int
	parentName string
	name       string
	torrent    *torrent.Torrent
	file       *torrent.File
	size       uint64
	mtime      time.Time
}

// Attr returns the attributes for a directory
func (o Object) Attr(ctx context.Context, attr *fuse.Attr) error {
	if o.objType == FILE {
		attr.Mode = 0644
	} else {
		attr.Mode = os.ModeDir | 0755
	}
	attr.Size = o.size

	attr.Uid = o.fs.uid
	attr.Gid = o.fs.gid

	attr.Ctime = o.mtime
	attr.Mtime = o.mtime

	attr.Blocks = (attr.Size + 511) >> 9

	return nil
}

// ReadDirAll shows all files in the current directory
func (o Object) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
	dirs := []fuse.Dirent{}
	switch o.objType {
	case ROOT:
		for _, directory := range o.fs.config.GetDirectories() {
			dirs = append(dirs, fuse.Dirent{
				Name: directory,
				Type: fuse.DT_Dir,
			})
		}
	case DIRECTORY:
		for el := o.fs.tMgr.TorrentMap.Front(); el != nil; el = el.Next() {
			torrent := el.Value
			if torrent.InProgress {
				continue
			}
			dirs = append(dirs, fuse.Dirent{
				Name: torrent.AccessKey,
				Type: fuse.DT_Dir,
			})
		}
	case TORRENT:
		torrent, _ := o.fs.tMgr.TorrentMap.Get(o.name)
		if torrent == nil || torrent.InProgress {
			return nil, syscall.ENOENT
		}
		for el := torrent.SelectedFiles.Front(); el != nil; el = el.Next() {
			file := el.Value
			if file.Link == "" {
				// log.Println("File has no link, skipping", file.Path)
				continue
			}
			filename := filepath.Base(file.Path)
			dirs = append(dirs, fuse.Dirent{
				Name: filename,
				Type: fuse.DT_File,
			})
		}
	}
	return dirs, nil
}

// Lookup tests if a file is existent in the current directory
func (o Object) Lookup(ctx context.Context, name string) (fs.Node, error) {
	switch o.objType {
	case ROOT:
		for _, directory := range o.fs.config.GetDirectories() {
			if directory == name {
				return Object{
					fs:         o.fs,
					objType:    DIRECTORY,
					parentName: o.name,
					name:       name,
					mtime:      o.fs.initTime,
				}, nil
			}
		}
	case DIRECTORY:
		torrent, _ := o.fs.tMgr.TorrentMap.Get(name)
		if torrent == nil {
			return nil, syscall.ENOENT
		}
		return Object{
			fs:         o.fs,
			objType:    TORRENT,
			parentName: o.name,
			name:       name,
			mtime:      convertRFC3339toTime(torrent.LatestAdded),
		}, nil

	case TORRENT:
		torrent, _ := o.fs.tMgr.TorrentMap.Get(o.name)
		if torrent == nil {
			return nil, syscall.ENOENT
		}
		file, _ := torrent.SelectedFiles.Get(name)
		if file == nil {
			return nil, syscall.ENOENT
		}
		return Object{
			fs:         o.fs,
			objType:    FILE,
			parentName: o.name,
			name:       name,
			torrent:    torrent,
			file:       file,
			size:       uint64(file.Bytes),
			mtime:      convertRFC3339toTime(file.Added),
		}, nil
	}
	return nil, syscall.ENOENT
}

// Open a file
func (o Object) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fs.Handle, error) {
	resp.Flags |= fuse.OpenDirectIO
	return o, nil
}

// Read reads some bytes or the whole file
func (o Object) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
	reader := universal.GetFileReader(o.torrent, o.file, req.Offset, int(req.Size), o.fs.tMgr, o.fs.config, o.fs.log)
	if reader == nil {
		return syscall.EIO
	}
	defer reader.Close()
	resp.Data = make([]byte, req.Size)
	_, err := reader.Read(resp.Data)
	if err != nil && err.Error() != "EOF" {
		o.fs.log.Errorf("Error reading bytes from Real-Debrid: %v", err)
		return syscall.EIO
	}
	return nil
}

// Remove deletes an element
func (o Object) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
	return fmt.Errorf("Remove not yet implemented")
}

// Rename renames an element
func (o Object) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fs.Node) error {
	return fmt.Errorf("Rename not yet implemented")
}

func convertRFC3339toTime(input string) time.Time {
	t, err := time.Parse(time.RFC3339, input)
	if err != nil {
		return time.Now()
	}
	return t
}