package boardvoting

//go:generate go-bindata -pkg $GOPACKAGE -o assets.go ./migrations/... ./static/... ./templates/...

import (
	"bytes"
	"errors"
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
)

var defaultFileTimestamp = time.Now()

type AssetFS struct {
	Asset     func(path string) ([]byte, error)
	AssetDir  func(path string) ([]string, error)
	AssetInfo func(path string) (os.FileInfo, error)
}

type FakeFile struct {
	Path      string
	Dir       bool
	Len       int64
	Timestamp time.Time
}

func (f *FakeFile) Name() string {
	_, name := filepath.Split(f.Path)
	return name
}

func (f *FakeFile) Size() int64 { return f.Len }

func (f *FakeFile) Mode() os.FileMode {
	mode := os.FileMode(0644)
	if f.Dir {
		return mode | os.ModeDir
	}
	return mode
}

func (f *FakeFile) ModTime() time.Time { return f.Timestamp }
func (f *FakeFile) IsDir() bool        { return f.Dir }
func (f *FakeFile) Sys() interface{}   { return nil }

type AssetFile struct {
	*bytes.Reader
	io.Closer
	FakeFile
}

func NewAssetFile(name string, content []byte, timestamp time.Time) *AssetFile {
	if timestamp.IsZero() {
		timestamp = defaultFileTimestamp
	}
	return &AssetFile{
		bytes.NewReader(content),
		ioutil.NopCloser(nil),
		FakeFile{name, false, int64(len(content)), timestamp},
	}
}

func (f *AssetFile) Readdir(count int) ([]os.FileInfo, error) {
	return nil, errors.New("not a directory")
}

func (f *AssetFile) Size() int64 {
	return f.FakeFile.Size()
}

func (f *AssetFile) Stat() (os.FileInfo, error) {
	return f, nil
}

type AssetDirectory struct {
	AssetFile
	ChildrenRead int
	Children     []os.FileInfo
}

func (f *AssetDirectory) Readdir(count int) ([]os.FileInfo, error) {
	if count <= 0 {
		return f.Children, nil
	}
	if f.ChildrenRead+count > len(f.Children) {
		count = len(f.Children) - f.ChildrenRead
	}
	rv := f.Children[f.ChildrenRead : f.ChildrenRead+count]
	f.ChildrenRead += count
	return rv, nil
}

func (f *AssetDirectory) Stat() (os.FileInfo, error) {
	return f, nil
}

func NewAssetDirectory(name string, children []string, fs *AssetFS) *AssetDirectory {
	fileInfos := make([]os.FileInfo, 0, len(children))
	for _, child := range children {
		_, err := fs.AssetDir(filepath.Join(name, child))
		fileInfos = append(fileInfos, &FakeFile{child, err == nil, 0, time.Time{}})
	}
	return &AssetDirectory{
		AssetFile{
			bytes.NewReader(nil),
			ioutil.NopCloser(nil),
			FakeFile{name, true, 0, time.Time{}},
		},
		0,
		fileInfos}
}

func (f *AssetFS) Open(name string) (http.File, error) {
	if len(name) > 0 && name[0] == '/' {
		name = name[1:]
	}
	if b, err := f.Asset(name); err == nil {
		timestamp := defaultFileTimestamp
		if f.AssetInfo != nil {
			if info, err := f.AssetInfo(name); err == nil {
				timestamp = info.ModTime()
			}
		}
		return NewAssetFile(name, b, timestamp), nil
	}
	if children, err := f.AssetDir(name); err == nil {
		return NewAssetDirectory(name, children, f), nil
	} else {
		if strings.Contains(err.Error(), "not found") {
			return nil, os.ErrNotExist
		}
		return nil, err
	}
}

func GetAssetFS() *AssetFS {
	return &AssetFS{Asset: Asset, AssetDir: AssetDir, AssetInfo: AssetInfo}
}