library photo;

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:photo/src/entity/_theme.dart';
import 'package:photo/src/permission_utils.dart';
import 'package:photo/src/ui/page/photo_list_page.dart';
import 'package:photo/src/ui/page/photo_main_page.dart';

import 'package:photo_manager/photo_manager.dart';

import 'package:photo/src/delegate/badge_delegate.dart';
import 'package:photo/src/delegate/checkbox_builder_delegate.dart';
import 'package:photo/src/delegate/loading_delegate.dart';
import 'package:photo/src/delegate/sort_delegate.dart';
import 'package:photo/src/entity/options.dart';
import 'package:photo/src/provider/i18n_provider.dart';
import 'package:provider/provider.dart';

import 'src/provider/config_provider.dart';
export 'package:photo/src/delegate/checkbox_builder_delegate.dart';
export 'package:photo/src/delegate/loading_delegate.dart';
export 'package:photo/src/delegate/sort_delegate.dart';
export 'package:photo/src/provider/i18n_provider.dart'
    show I18NCustomProvider, I18nProvider, CNProvider, ENProvider;
export 'package:photo/src/entity/options.dart' show PickType, PickedEntity;
export 'package:photo/src/delegate/badge_delegate.dart';
export 'package:photo/src/entity/_theme.dart';
export 'package:image_picker/image_picker.dart' show CameraDevice, PickedFile;
export 'package:photo_manager/photo_manager.dart' show AssetEntity, AssetType;

class PhotoPicker {
  static PhotoPicker _instance;

  PhotoPicker._();

  factory PhotoPicker() {
    _instance ??= PhotoPicker._();
    return _instance;
  }

  static const String rootRouteName = "photo_picker_image";

  /// 没有授予权限的时候,会开启一个dialog去帮助用户去应用设置页面开启权限
  /// 确定开启设置页面,取消关闭弹窗,无论选择什么,返回值都是null
  /// 当用户给予权限后
  ///
  /// 返回一个[PickedEntity] 内有[AssetEntity]以及[isFullImage]
  ///
  /// 当用户取消时[AssetEntity]返回一个空数组
  ///
  /// [photoPathList] 一旦设置 则 [pickType]参数无效
  ///
  /// [pickedAssetList] 已选择的asset
  ///
  /// 关于参数可以查看readme文档介绍
  static Future<PickedEntity> pickAsset({
    @required BuildContext context,
    int rowCount = 4,
    int maxSelected = 9,
    double padding = 0.5,
    double itemRadio = 1.0,
    int thumbSize = 180,
    PhotoTheme theme,
    I18nProvider provider = I18nProvider.chinese,
    SortDelegate sortDelegate,
    LoadingDelegate loadingDelegate,
    PickType pickType = PickType.all,
    List<AssetPathEntity> photoPathList,
    List<AssetEntity> pickedAssetList,
  }) {
    assert(maxSelected != 0, "maxSelected must be not 0");
    assert(provider != null, "provider must be not null");
    assert(context != null, "context must be not null");
    assert(pickType != null, "pickType must be not null");

    sortDelegate ??= SortDelegate.common;

    loadingDelegate ??= DefaultLoadingDelegate();

    var options = Options(
      rowCount: rowCount,
      maxSelected: maxSelected,
      itemRadio: itemRadio,
      padding: padding,
      theme: theme ?? PhotoTheme.fallback(context),
      thumbSize: thumbSize,
      sortDelegate: sortDelegate,
      checkBoxBuilderDelegate: DefaultCheckBoxBuilderDelegate(),
      loadingDelegate: loadingDelegate,
      badgeDelegate: DurationBadgeDelegate(),
      pickType: pickType,
    );

    return PhotoPicker()._pickAsset(
      context,
      options,
      provider,
      photoPathList,
      pickedAssetList,
    );
  }

  static Future<AssetEntity> pickSingleAsset({
    @required BuildContext context,
    int rowCount = 4,
    double padding = 0.5,
    double itemRadio = 1.0,
    int thumbSize = 180,
    PhotoTheme theme,
    I18nProvider provider = I18nProvider.chinese,
    SortDelegate sortDelegate,
    LoadingDelegate loadingDelegate,
    PickType pickType = PickType.all,
    List<AssetPathEntity> photoPathList,
  }) async {
    final PickedEntity result = await PhotoPicker.pickAsset(
      context: context,
      rowCount: rowCount,
      maxSelected: 1,
      padding: padding,
      itemRadio: itemRadio,
      thumbSize: thumbSize,
      theme: theme,
      provider: provider,
      sortDelegate: sortDelegate,
      loadingDelegate: loadingDelegate,
      pickType: pickType,
      photoPathList: photoPathList,
      pickedAssetList: [],
    );
    if (result.asset.isNotEmpty) {
      return result.asset[0];
    }
    return null;
  }

  static Future<PickedFile> pickCamera({
    double maxWidth,
    double maxHeight,
    int imageQuality,
    CameraDevice preferredCameraDevice = CameraDevice.rear,
  }) async {
    final bool status = await PermissionUtils.canPermission(Permission.camera);
    if (!status) {
      throw 'permission denied';
    } else {
      return ImagePicker().getImage(
        source: ImageSource.camera,
        maxWidth: maxWidth,
        maxHeight: maxHeight,
        imageQuality: imageQuality,
        preferredCameraDevice: preferredCameraDevice,
      );
    }
  }

  Future<PickedEntity> _pickAsset(
    BuildContext context,
    Options options,
    I18nProvider provider,
    List<AssetPathEntity> photoList,
    List<AssetEntity> pickedAssetList,
  ) async {
    final bool status = await PermissionUtils.canMultiplePermission([Permission.photos, Permission.storage]);
    if (!status) {
      throw 'permission denied';
    } else {
      return _openGalleryContentPage(
        context,
        options,
        provider,
        photoList,
        pickedAssetList,
      );
    }
  }

  static Widget buildGallery({
    @required BuildContext context,
    double padding = 1,
    int maxSelected = 9,
    int thumbSize = 180,
    double itemRadio = 1.0,
    PhotoTheme theme,
    I18nProvider provider = I18nProvider.chinese,
    SortDelegate sortDelegate,
    LoadingDelegate loadingDelegate,
    PickType pickType = PickType.all,
    List<AssetPathEntity> photoPathList,
    List<AssetEntity> pickedAssetList,
    bool isFullImage = false,
    void Function(PickedEntity value) onSelected,
  }) {
    sortDelegate ??= SortDelegate.common;

    loadingDelegate ??= DefaultLoadingDelegate();

    var options = ListOptions(
      padding: padding,
      maxSelected: maxSelected,
      itemRadio: itemRadio,
      theme: theme ?? PhotoTheme.fallback(context),
      thumbSize: thumbSize,
      sortDelegate: sortDelegate,
      checkBoxBuilderDelegate: DefaultCheckBoxBuilderDelegate(),
      loadingDelegate: loadingDelegate,
      badgeDelegate: DurationBadgeDelegate(),
      pickType: pickType,
    );
    assert(provider != null, "provider must be not null");
    assert(context != null, "context must be not null");
    assert(pickType != null, "pickType must be not null");

    return ChangeNotifierProvider(
      create: (_) => PhotoProvider(
        provider: provider,
        options: options,
        pickedAssetList: pickedAssetList,
      ),
      child: PhotoListPage(
        onSelected: onSelected,
        options: options,
        isFullImage: isFullImage,
      ),
    );
  }

  Future<bool> requestPermission({@required I18nProvider provider, @required List<Permission> permissions}) async {
    final bool status =
        await PermissionUtils.canMultiplePermission(permissions);
    // if (!status) {
    //   var result = await showDialog(
    //     context: context,
    //     builder: (ctx) => NotPermissionDialog(
    //       provider.getNotPermissionText(),
    //     ),
    //   );
    //   if (result == true) {
    //     PhotoManager.openSetting();
    //   }
    //   return false;
    // }
    return status;
  }

  Future<PickedEntity> _openGalleryContentPage(
    BuildContext context,
    Options options,
    I18nProvider provider,
    List<AssetPathEntity> photoList,
    List<AssetEntity> pickedAssetList,
  ) async {
    return Navigator.of(context, rootNavigator: true).push(
      MaterialPageRoute(
        builder: (ctx) => ChangeNotifierProvider(
          create: (_) => PhotoProvider(
            provider: provider,
            options: options,
            pickedAssetList: pickedAssetList,
          ),
          child: PhotoMainPage(
            onClose: (PickedEntity value) {
              Navigator.pop(ctx, value);
            },
            options: options,
            photoList: photoList,
          ),
        ),
      ),
    );
  }
}