// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
import 'package:file_selector_windows/file_selector_windows.dart';
import 'package:flutter/foundation.dart';
import 'package:image_picker_platform_interface/image_picker_platform_interface.dart';

/// The Windows implementation of [ImagePickerPlatform].
///
/// This class implements the `package:image_picker` functionality for
/// Windows.
class ImagePickerWindows extends CameraDelegatingImagePickerPlatform {
  /// Constructs a ImagePickerWindows.
  ImagePickerWindows();

  /// List of image extensions used when picking images
  @visibleForTesting
  static const List<String> imageFormats = <String>[
    'jpg',
    'jpeg',
    'png',
    'bmp',
    'webp',
    'gif',
    'tif',
    'tiff',
    'apng'
  ];

  /// List of video extensions used when picking videos
  @visibleForTesting
  static const List<String> videoFormats = <String>[
    'mov',
    'wmv',
    'mkv',
    'mp4',
    'webm',
    'avi',
    'mpeg',
    'mpg'
  ];

  /// The file selector used to prompt the user to select images or videos.
  @visibleForTesting
  static FileSelectorPlatform fileSelector = FileSelectorWindows();

  /// Registers this class as the default instance of [ImagePickerPlatform].
  static void registerWith() {
    ImagePickerPlatform.instance = ImagePickerWindows();
  }

  // This is soft-deprecated in the platform interface, and is only implemented
  // for compatibility. Callers should be using getImageFromSource.
  @override
  Future<PickedFile?> pickImage({
    required ImageSource source,
    double? maxWidth,
    double? maxHeight,
    int? imageQuality,
    CameraDevice preferredCameraDevice = CameraDevice.rear,
  }) async {
    final XFile? file = await getImageFromSource(
        source: source,
        options: ImagePickerOptions(
            maxWidth: maxWidth,
            maxHeight: maxHeight,
            imageQuality: imageQuality,
            preferredCameraDevice: preferredCameraDevice));
    if (file != null) {
      return PickedFile(file.path);
    }
    return null;
  }

  // This is soft-deprecated in the platform interface, and is only implemented
  // for compatibility. Callers should be using getVideo.
  @override
  Future<PickedFile?> pickVideo({
    required ImageSource source,
    CameraDevice preferredCameraDevice = CameraDevice.rear,
    Duration? maxDuration,
  }) async {
    final XFile? file = await getVideo(
        source: source,
        preferredCameraDevice: preferredCameraDevice,
        maxDuration: maxDuration);
    if (file != null) {
      return PickedFile(file.path);
    }
    return null;
  }

  // This is soft-deprecated in the platform interface, and is only implemented
  // for compatibility. Callers should be using getImageFromSource.
  @override
  Future<XFile?> getImage({
    required ImageSource source,
    double? maxWidth,
    double? maxHeight,
    int? imageQuality,
    CameraDevice preferredCameraDevice = CameraDevice.rear,
  }) async {
    return getImageFromSource(
        source: source,
        options: ImagePickerOptions(
            maxWidth: maxWidth,
            maxHeight: maxHeight,
            imageQuality: imageQuality,
            preferredCameraDevice: preferredCameraDevice));
  }

  // [ImagePickerOptions] options are not currently supported. If any
  // of its fields are set, they will be silently ignored.
  //
  // If source is `ImageSource.camera`, a `StateError` will be thrown
  // unless a [cameraDelegate] is set.
  @override
  Future<XFile?> getImageFromSource({
    required ImageSource source,
    ImagePickerOptions options = const ImagePickerOptions(),
  }) async {
    switch (source) {
      case ImageSource.camera:
        return super.getImageFromSource(source: source);
      case ImageSource.gallery:
        const XTypeGroup typeGroup =
            XTypeGroup(label: 'Images', extensions: imageFormats);
        final XFile? file = await fileSelector
            .openFile(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
        return file;
    }
    // Ensure that there's a fallback in case a new source is added.
    // ignore: dead_code
    throw UnimplementedError('Unknown ImageSource: $source');
  }

  // `preferredCameraDevice` and `maxDuration` arguments are not currently
  // supported. If either of these arguments are supplied, they will be silently
  // ignored.
  //
  // If source is `ImageSource.camera`, a `StateError` will be thrown
  // unless a [cameraDelegate] is set.
  @override
  Future<XFile?> getVideo({
    required ImageSource source,
    CameraDevice preferredCameraDevice = CameraDevice.rear,
    Duration? maxDuration,
  }) async {
    switch (source) {
      case ImageSource.camera:
        return super.getVideo(
            source: source,
            preferredCameraDevice: preferredCameraDevice,
            maxDuration: maxDuration);
      case ImageSource.gallery:
        const XTypeGroup typeGroup =
            XTypeGroup(label: 'Videos', extensions: videoFormats);
        final XFile? file = await fileSelector
            .openFile(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
        return file;
    }
    // Ensure that there's a fallback in case a new source is added.
    // ignore: dead_code
    throw UnimplementedError('Unknown ImageSource: $source');
  }

  // `maxWidth`, `maxHeight`, and `imageQuality` arguments are not currently
  // supported. If any of these arguments are supplied, they will be silently
  // ignored.
  @override
  Future<List<XFile>> getMultiImage({
    double? maxWidth,
    double? maxHeight,
    int? imageQuality,
  }) async {
    const XTypeGroup typeGroup =
        XTypeGroup(label: 'Images', extensions: imageFormats);
    final List<XFile> files = await fileSelector
        .openFiles(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
    return files;
  }

  // `maxWidth`, `maxHeight`, and `imageQuality` arguments are not
  // supported on Windows. If any of these arguments is supplied,
  // they will be silently ignored by the Windows version of the plugin.
  @override
  Future<List<XFile>> getMedia({required MediaOptions options}) async {
    const XTypeGroup typeGroup = XTypeGroup(
        label: 'images and videos',
        extensions: <String>[...imageFormats, ...videoFormats]);

    List<XFile> files;

    if (options.allowMultiple) {
      files = await fileSelector
          .openFiles(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
    } else {
      final XFile? file = await fileSelector
          .openFile(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
      files = <XFile>[
        if (file != null) file,
      ];
    }
    return files;
  }
}