import 'package:cached_network_image/cached_network_image.dart';
import 'package:event_bus/event_bus.dart';
import 'package:flutter/material.dart';
import 'package:kiwi/kiwi.dart';
import 'package:nc_photos/account.dart';
import 'package:nc_photos/api/api_util.dart' as api_util;
import 'package:nc_photos/event/event.dart';
import 'package:nc_photos/pref.dart';
import 'package:nc_photos/theme.dart';
import 'package:nc_photos/widget/account_picker_dialog.dart';
import 'package:nc_photos/widget/app_bar_circular_progress_indicator.dart';
import 'package:nc_photos/widget/app_bar_title_container.dart';
import 'package:nc_photos/widget/translucent_sliver_app_bar.dart';

/// AppBar for home screens
class HomeSliverAppBar extends StatelessWidget {
  const HomeSliverAppBar({
    Key? key,
    required this.account,
    this.actions,
    this.menuActions,
    this.onSelectedMenuActions,
    this.isShowProgressIcon = false,
  }) : super(key: key);

  @override
  build(BuildContext context) {
    final accountLabel = AccountPref.of(account).getAccountLabel();
    return TranslucentSliverAppBar(
      title: InkWell(
        onTap: () {
          showDialog(
            context: context,
            builder: (_) => const AccountPickerDialog(),
          );
        },
        child: AppBarTitleContainer(
          title: Row(
            children: [
              account.scheme == "http"
                  ? Icon(
                      Icons.no_encryption_outlined,
                      color: Theme.of(context).colorScheme.error,
                      size: 16,
                    )
                  : Icon(
                      Icons.https,
                      color: Theme.of(context).colorScheme.primary,
                      size: 16,
                    ),
              Expanded(
                child: Text(
                  accountLabel ?? account.address,
                  maxLines: 1,
                  overflow: TextOverflow.clip,
                ),
              ),
            ],
          ),
          subtitle: accountLabel == null ? Text(account.username2) : null,
          icon: isShowProgressIcon
              ? const AppBarCircularProgressIndicator()
              : _LeadingView(account: account),
        ),
      ),
      scrolledUnderBackgroundColor:
          Theme.of(context).homeNavigationBarBackgroundColor,
      floating: true,
      automaticallyImplyLeading: false,
      actions: (actions ?? []) +
          [
            if (!Pref().isFollowSystemThemeOr(false))
              _DarkModeSwitch(
                onChanged: _onDarkModeChanged,
              ),
            if (menuActions?.isNotEmpty == true)
              PopupMenuButton<int>(
                tooltip: MaterialLocalizations.of(context).moreButtonTooltip,
                itemBuilder: (_) => menuActions!,
                onSelected: (option) {
                  if (option >= 0) {
                    onSelectedMenuActions?.call(option);
                  }
                },
              ),
          ],
    );
  }

  void _onDarkModeChanged(bool value) {
    Pref().setDarkTheme(value).then((_) {
      KiwiContainer().resolve<EventBus>().fire(ThemeChangedEvent());
    });
  }

  final Account account;

  /// Screen specific action buttons
  final List<Widget>? actions;

  /// Screen specific actions under the overflow menu. The value of each item
  /// much >= 0
  final List<PopupMenuEntry<int>>? menuActions;
  final void Function(int)? onSelectedMenuActions;
  final bool isShowProgressIcon;
}

class _DarkModeSwitch extends StatelessWidget {
  const _DarkModeSwitch({
    this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: buildDarkModeSwitchTheme(context),
      child: Switch(
        value: Theme.of(context).brightness == Brightness.dark,
        onChanged: onChanged,
        activeThumbImage:
            const AssetImage("assets/ic_dark_mode_switch_24dp.png"),
        inactiveThumbImage:
            const AssetImage("assets/ic_dark_mode_switch_24dp.png"),
      ),
    );
  }

  final ValueChanged<bool>? onChanged;
}

class _LeadingView extends StatelessWidget {
  const _LeadingView({
    required this.account,
  });

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: BorderRadius.circular(24),
      child: CachedNetworkImage(
        imageUrl: api_util.getAccountAvatarUrl(account, 64),
        fadeInDuration: const Duration(),
        filterQuality: FilterQuality.high,
      ),
    );
  }

  final Account account;
}