package mocks

import (
	"context"
	"io"
	"strings"
	"time"

	"github.com/docker/distribution/registry/storage/driver"
)

type StorageDriverMock struct {
	NameFn       func() string
	GetContentFn func(ctx context.Context, path string) ([]byte, error)
	PutContentFn func(ctx context.Context, path string, content []byte) error
	ReaderFn     func(ctx context.Context, path string, offset int64) (io.ReadCloser, error)
	WriterFn     func(ctx context.Context, path string, isAppend bool) (driver.FileWriter, error)
	StatFn       func(ctx context.Context, path string) (driver.FileInfo, error)
	ListFn       func(ctx context.Context, path string) ([]string, error)
	MoveFn       func(ctx context.Context, sourcePath, destPath string) error
	DeleteFn     func(ctx context.Context, path string) error
	WalkFn       func(ctx context.Context, path string, f driver.WalkFn) error
}

// nolint: gochecknoglobals
var (
	fileWriterSize = 12
	fileInfoSize   = 10
)

func (s *StorageDriverMock) Name() string {
	if s != nil && s.NameFn != nil {
		return s.NameFn()
	}

	return ""
}

func (s *StorageDriverMock) GetContent(ctx context.Context, path string) ([]byte, error) {
	if s != nil && s.GetContentFn != nil {
		return s.GetContentFn(ctx, path)
	}

	return []byte{}, nil
}

func (s *StorageDriverMock) PutContent(ctx context.Context, path string, content []byte) error {
	if s != nil && s.PutContentFn != nil {
		return s.PutContentFn(ctx, path, content)
	}

	return nil
}

func (s *StorageDriverMock) Reader(ctx context.Context, path string, offset int64) (io.ReadCloser, error) {
	if s != nil && s.ReaderFn != nil {
		return s.ReaderFn(ctx, path, offset)
	}

	return io.NopCloser(strings.NewReader("")), nil
}

func (s *StorageDriverMock) Writer(ctx context.Context, path string, isAppend bool) (driver.FileWriter, error) {
	if s != nil && s.WriterFn != nil {
		return s.WriterFn(ctx, path, isAppend)
	}

	return &FileWriterMock{}, nil
}

func (s *StorageDriverMock) Stat(ctx context.Context, path string) (driver.FileInfo, error) {
	if s != nil && s.StatFn != nil {
		return s.StatFn(ctx, path)
	}

	return &FileInfoMock{}, nil
}

func (s *StorageDriverMock) List(ctx context.Context, path string) ([]string, error) {
	if s != nil && s.ListFn != nil {
		return s.ListFn(ctx, path)
	}

	return []string{"a"}, nil
}

func (s *StorageDriverMock) Move(ctx context.Context, sourcePath, destPath string) error {
	if s != nil && s.MoveFn != nil {
		return s.MoveFn(ctx, sourcePath, destPath)
	}

	return nil
}

func (s *StorageDriverMock) Delete(ctx context.Context, path string) error {
	if s != nil && s.DeleteFn != nil {
		return s.DeleteFn(ctx, path)
	}

	return nil
}

func (s *StorageDriverMock) URLFor(ctx context.Context, path string, options map[string]interface{}) (string, error) {
	return "", nil
}

func (s *StorageDriverMock) Walk(ctx context.Context, path string, f driver.WalkFn) error {
	if s != nil && s.WalkFn != nil {
		return s.WalkFn(ctx, path, f)
	}

	return nil
}

type FileInfoMock struct {
	IsDirFn func() bool
	SizeFn  func() int64
}

func (f *FileInfoMock) Path() string {
	return ""
}

func (f *FileInfoMock) Size() int64 {
	if f != nil && f.SizeFn != nil {
		return f.SizeFn()
	}

	return int64(fileInfoSize)
}

func (f *FileInfoMock) ModTime() time.Time {
	return time.Now()
}

func (f *FileInfoMock) IsDir() bool {
	if f != nil && f.IsDirFn != nil {
		return f.IsDirFn()
	}

	return true
}

type FileWriterMock struct {
	WriteFn  func([]byte) (int, error)
	CancelFn func() error
	CommitFn func() error
	CloseFn  func() error
}

func (f *FileWriterMock) Size() int64 {
	return int64(fileWriterSize)
}

func (f *FileWriterMock) Cancel() error {
	if f != nil && f.CancelFn != nil {
		return f.CancelFn()
	}

	return nil
}

func (f *FileWriterMock) Commit() error {
	if f != nil && f.CommitFn != nil {
		return f.CommitFn()
	}

	return nil
}

func (f *FileWriterMock) Write(p []byte) (int, error) {
	if f != nil && f.WriteFn != nil {
		return f.WriteFn(p)
	}

	return 10, nil
}

func (f *FileWriterMock) Close() error {
	if f != nil && f.CloseFn != nil {
		return f.CloseFn()
	}

	return nil
}