package main

import (
	"errors"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strings"
	"time"

	ftpd "github.com/goftp/server"
	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/postgres"

	system "dev.sum7.eu/sum7/warehost/system"
)

type FileDriver struct {
	RootPath string
	db       *gorm.DB
	Perm     ftpd.Perm
	login    system.Login
	conn     *ftpd.Conn
}

type FackFileInfo struct {
	os.FileInfo

	name string
}

func (f *FackFileInfo) Mode() os.FileMode {
	return os.ModeDir
}
func (f *FackFileInfo) IsDir() bool {
	return true
}

func (f *FackFileInfo) Name() string {
	return f.name
}
func (f *FackFileInfo) Owner() string {
	return "warehost"
}
func (f *FackFileInfo) Size() int64 {
	return 0
}
func (f *FackFileInfo) ModTime() time.Time {
	return time.Now()
}

func (f *FackFileInfo) Group() string {
	return "http"
}

type FileInfo struct {
	os.FileInfo

	mode  os.FileMode
	owner string
	group string
}

func (f *FileInfo) Mode() os.FileMode {
	return f.mode
}

func (f *FileInfo) Owner() string {
	return f.owner
}

func (f *FileInfo) Group() string {
	return f.group
}

func (driver *FileDriver) chechLogin() {
	if driver.login.ID <= 0 && driver.conn.IsLogin() {
		driver.db.Where("mail = ?", driver.conn.LoginUser()).First(&driver.login)
		fmt.Printf("Connection:%s:%d", driver.conn.LoginUser(), driver.login.ID)
	}
}
func (driver *FileDriver) realPath(path string) (string, bool) {
	driver.chechLogin()
	paths := strings.Split(path, "/")
	root := "/dev/null"
	real := false
	if len(paths) > 1 && driver.login.ID > 0 {
		switch paths[1] {
		case "data":
			root = fmt.Sprintf(driver.RootPath, driver.login.ID)
			paths = append([]string{paths[0]}, paths[2:]...)
			real = true
		}
	}
	return filepath.Join(append([]string{root}, paths...)...), real
}

func (driver *FileDriver) Init(conn *ftpd.Conn) {
	driver.conn = conn
}

func (driver *FileDriver) ChangeDir(path string) error {
	rPath, real := driver.realPath(path)
	if !real {
		return nil
	}
	f, err := os.Lstat(rPath)
	if err != nil {
		return err
	}
	if f.IsDir() {
		return nil
	}
	return errors.New("Not a directory")
}

func (driver *FileDriver) Stat(path string) (ftpd.FileInfo, error) {
	basepath, real := driver.realPath(path)
	var f os.FileInfo
	if real {

		rPath, err := filepath.Abs(basepath)
		if err != nil {
			return nil, err
		}
		f, err = os.Lstat(rPath)
		if err != nil {
			return nil, err
		}
	} else {
		f = &FackFileInfo{name: path}
	}
	mode, err := driver.Perm.GetMode(path)
	if err != nil {
		return nil, err
	}
	if f.IsDir() {
		mode |= os.ModeDir
	}
	owner, err := driver.Perm.GetOwner(path)
	if err != nil {
		return nil, err
	}
	group, err := driver.Perm.GetGroup(path)
	if err != nil {
		return nil, err
	}
	return &FileInfo{f, mode, owner, group}, nil
}

func (driver *FileDriver) ListDir(path string, callback func(ftpd.FileInfo) error) error {
	basepath, real := driver.realPath(path)
	if real {
		filepath.Walk(basepath, func(f string, info os.FileInfo, err error) error {
			rPath, _ := filepath.Rel(basepath, f)
			if rPath == info.Name() {
				mode, err := driver.Perm.GetMode(rPath)
				if err != nil {
					return err
				}
				if info.IsDir() {
					mode |= os.ModeDir
				}
				owner, err := driver.Perm.GetOwner(rPath)
				if err != nil {
					return err
				}
				group, err := driver.Perm.GetGroup(rPath)
				if err != nil {
					return err
				}
				err = callback(&FileInfo{info, mode, owner, group})
				if err != nil {
					return err
				}
			}
			return nil
		})
		return nil
	} else {
		if path == "/" {
			for _, i := range []string{"data", "web", "host"} {
				err := callback(&FackFileInfo{name: i})
				if err != nil {
					return err
				}
			}
			return nil
		}
		return errors.New("No path")
	}
}

func (driver *FileDriver) DeleteDir(path string) error {
	rPath, real := driver.realPath(path)
	if !real {
		return errors.New("Warehost folders are not deletable")
	}
	f, err := os.Lstat(rPath)
	if err != nil {
		return err
	}
	if f.IsDir() {
		return os.Remove(rPath)
	}
	return errors.New("Not a directory")
}

func (driver *FileDriver) DeleteFile(path string) error {
	rPath, real := driver.realPath(path)
	if !real {
		return errors.New("Warehost files are not deletable")
	}
	f, err := os.Lstat(rPath)
	if err != nil {
		return err
	}
	if !f.IsDir() {
		return os.Remove(rPath)
	}
	return errors.New("Not a file")
}

func (driver *FileDriver) Rename(fromPath string, toPath string) error {
	oldPath, realOld := driver.realPath(fromPath)
	newPath, realNew := driver.realPath(toPath)
	if !realOld || !realNew {
		return errors.New("Warehost files/folders are not moveable")
	}
	return os.Rename(oldPath, newPath)
}

func (driver *FileDriver) MakeDir(path string) error {
	rPath, real := driver.realPath(path)
	if !real {
		return errors.New("Warehost folders are not createable")
	}
	return os.Mkdir(rPath, os.ModePerm)

}

func (driver *FileDriver) GetFile(path string, offset int64) (int64, io.ReadCloser, error) {
	rPath, real := driver.realPath(path)
	if !real {
		return 0, nil, errors.New("Warehost files are not downloadable")
	}
	f, err := os.Open(rPath)
	if err != nil {
		return 0, nil, err
	}

	info, err := f.Stat()
	if err != nil {
		return 0, nil, err
	}

	f.Seek(offset, os.SEEK_SET)

	return info.Size(), f, nil
}

func (driver *FileDriver) PutFile(destPath string, data io.Reader, appendData bool) (int64, error) {
	rPath, real := driver.realPath(destPath)
	if !real {
		return 0, errors.New("Warehost files are not replaceable")
	}
	var isExist bool
	f, err := os.Lstat(rPath)
	if err == nil {
		isExist = true
		if f.IsDir() {
			return 0, errors.New("A dir has the same name")
		}
	} else {
		if os.IsNotExist(err) {
			isExist = false
		} else {
			return 0, errors.New(fmt.Sprintln("Put File error:", err))
		}
	}

	if appendData && !isExist {
		appendData = false
	}

	if !appendData {
		if isExist {
			err = os.Remove(rPath)
			if err != nil {
				return 0, err
			}
		}
		f, err := os.Create(rPath)
		if err != nil {
			return 0, err
		}
		defer f.Close()
		bytes, err := io.Copy(f, data)
		if err != nil {
			return 0, err
		}
		return bytes, nil
	}

	of, err := os.OpenFile(rPath, os.O_APPEND|os.O_RDWR, 0660)
	if err != nil {
		return 0, err
	}
	defer of.Close()

	_, err = of.Seek(0, os.SEEK_END)
	if err != nil {
		return 0, err
	}

	bytes, err := io.Copy(of, data)
	if err != nil {
		return 0, err
	}

	return bytes, nil
}

type FileDriverFactory struct {
	RootPath string
	db       *gorm.DB
	Perm     ftpd.Perm
}

func (factory *FileDriverFactory) NewDriver() (ftpd.Driver, error) {
	return &FileDriver{RootPath: factory.RootPath, db: factory.db, Perm: factory.Perm}, nil
}