import 'dart:ui';

import 'package:emoji_picker_flutter/emoji_picker_flutter.dart';
import 'package:famedlysdk/famedlysdk.dart';
import 'package:fluffychat/pages/chat.dart';
import 'package:fluffychat/widgets/avatar.dart';
import 'package:fluffychat/widgets/chat_settings_popup_menu.dart';
import 'package:fluffychat/widgets/connection_status_header.dart';
import 'package:fluffychat/widgets/input_bar.dart';
import 'package:fluffychat/widgets/unread_badge_back_button.dart';

import 'package:future_loading_dialog/future_loading_dialog.dart';
import 'package:fluffychat/widgets/encryption_button.dart';
import 'package:fluffychat/widgets/event_content/message.dart';
import 'package:fluffychat/widgets/matrix.dart';
import 'package:fluffychat/widgets/event_content/reply_content.dart';
import 'package:fluffychat/pages/user_bottom_sheet.dart';
import 'package:fluffychat/config/app_emojis.dart';
import 'package:fluffychat/utils/matrix_sdk_extensions.dart/matrix_locals.dart';
import 'package:fluffychat/utils/platform_infos.dart';
import 'package:fluffychat/utils/room_status_extension.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_gen/gen_l10n/l10n.dart';
import 'package:scroll_to_index/scroll_to_index.dart';
import 'package:swipe_to_action/swipe_to_action.dart';
import 'package:vrouter/vrouter.dart';

class ChatView extends StatelessWidget {
  final ChatController controller;

  const ChatView(this.controller, {Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    controller.matrix = Matrix.of(context);
    final client = controller.matrix.client;
    controller.room ??= client.getRoomById(controller.roomId);
    if (controller.room == null) {
      return Scaffold(
        appBar: AppBar(
          title: Text(L10n.of(context).oopsSomethingWentWrong),
        ),
        body: Center(
          child: Text(L10n.of(context).youAreNoLongerParticipatingInThisChat),
        ),
      );
    }

    if (controller.room.membership == Membership.invite) {
      showFutureLoadingDialog(
          context: context, future: () => controller.room.join());
    }

    return VWidgetGuard(
        onSystemPop: (redirector) async {
          if (controller.selectedEvents.isNotEmpty) {
            controller.clearSelectedEvents();
            redirector.stopRedirection();
          }
        },
        child: Scaffold(
          appBar: AppBar(
            leading: controller.selectMode
                ? IconButton(
                    icon: Icon(Icons.close),
                    onPressed: controller.clearSelectedEvents,
                    tooltip: L10n.of(context).close,
                  )
                : UnreadBadgeBackButton(roomId: controller.roomId),
            titleSpacing: 0,
            title: controller.selectedEvents.isEmpty
                ? StreamBuilder(
                    stream: controller.room.onUpdate.stream,
                    builder: (context, snapshot) => ListTile(
                          leading: Avatar(controller.room.avatar,
                              controller.room.displayname),
                          contentPadding: EdgeInsets.zero,
                          onTap: controller.room.isDirectChat
                              ? () => showModalBottomSheet(
                                    context: context,
                                    builder: (c) => UserBottomSheet(
                                      user: controller.room.getUserByMXIDSync(
                                          controller.room.directChatMatrixID),
                                      outerContext: context,
                                      onMention: () => controller
                                              .sendController.text +=
                                          '${controller.room.directChatMatrixID} ',
                                    ),
                                  )
                              : () => VRouter.of(context)
                                  .push('/rooms/${controller.room.id}/details'),
                          title: Text(
                              controller.room.getLocalizedDisplayname(
                                  MatrixLocals(L10n.of(context))),
                              maxLines: 1),
                          subtitle: controller.room
                                  .getLocalizedTypingText(context)
                                  .isEmpty
                              ? StreamBuilder<Object>(
                                  stream: Matrix.of(context)
                                      .client
                                      .onPresence
                                      .stream
                                      .where((p) =>
                                          p.senderId ==
                                          controller.room.directChatMatrixID),
                                  builder: (context, snapshot) => Text(
                                        controller.room
                                            .getLocalizedStatus(context),
                                        maxLines: 1,
                                        //overflow: TextOverflow.ellipsis,
                                      ))
                              : Row(
                                  children: <Widget>[
                                    Icon(Icons.edit_outlined,
                                        color: Theme.of(context)
                                            .colorScheme
                                            .secondary,
                                        size: 13),
                                    SizedBox(width: 4),
                                    Expanded(
                                      child: Text(
                                        controller.room
                                            .getLocalizedTypingText(context),
                                        maxLines: 1,
                                        style: TextStyle(
                                          color: Theme.of(context)
                                              .colorScheme
                                              .secondary,
                                          fontStyle: FontStyle.italic,
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                        ))
                : Text(L10n.of(context).numberSelected(
                    controller.selectedEvents.length.toString())),
            actions: controller.selectMode
                ? <Widget>[
                    if (controller.selectedEvents.length == 1 &&
                        controller.selectedEvents.first.status > 0 &&
                        controller.selectedEvents.first.senderId ==
                            client.userID)
                      IconButton(
                        icon: Icon(Icons.edit_outlined),
                        tooltip: L10n.of(context).edit,
                        onPressed: controller.editSelectedEventAction,
                      ),
                    PopupMenuButton(
                      onSelected: controller.onEventActionPopupMenuSelected,
                      itemBuilder: (_) => [
                        PopupMenuItem(
                          value: 'copy',
                          child: Text(L10n.of(context).copy),
                        ),
                        if (controller.canRedactSelectedEvents)
                          PopupMenuItem(
                            value: 'redact',
                            child: Text(
                              L10n.of(context).redactMessage,
                              style: TextStyle(color: Colors.orange),
                            ),
                          ),
                        if (controller.selectedEvents.length == 1)
                          PopupMenuItem(
                            value: 'report',
                            child: Text(
                              L10n.of(context).reportMessage,
                              style: TextStyle(color: Colors.red),
                            ),
                          ),
                      ],
                    ),
                  ]
                : <Widget>[
                    if (controller.room.canSendDefaultStates)
                      IconButton(
                        tooltip: L10n.of(context).videoCall,
                        icon: Icon(Icons.video_call_outlined),
                        onPressed: controller.startCallAction,
                      ),
                    ChatSettingsPopupMenu(
                        controller.room, !controller.room.isDirectChat),
                  ],
          ),
          floatingActionButton: controller.showScrollDownButton
              ? Padding(
                  padding: const EdgeInsets.only(bottom: 56.0),
                  child: FloatingActionButton(
                    onPressed: controller.scrollDown,
                    foregroundColor:
                        Theme.of(context).textTheme.bodyText2.color,
                    backgroundColor: Theme.of(context).scaffoldBackgroundColor,
                    mini: true,
                    child: Icon(Icons.arrow_downward_outlined,
                        color: Theme.of(context).primaryColor),
                  ),
                )
              : null,
          body: Stack(
            children: <Widget>[
              if (Matrix.of(context).wallpaper != null)
                Image.file(
                  Matrix.of(context).wallpaper,
                  width: double.infinity,
                  height: double.infinity,
                  fit: BoxFit.cover,
                ),
              SafeArea(
                child: Column(
                  children: <Widget>[
                    ConnectionStatusHeader(),
                    if (controller.room.getState(EventTypes.RoomTombstone) !=
                        null)
                      Container(
                        height: 72,
                        child: Material(
                          color: Theme.of(context).secondaryHeaderColor,
                          child: ListTile(
                            leading: CircleAvatar(
                              foregroundColor:
                                  Theme.of(context).colorScheme.secondary,
                              backgroundColor:
                                  Theme.of(context).backgroundColor,
                              child: Icon(Icons.upgrade_outlined),
                            ),
                            title: Text(
                              controller.room
                                  .getState(EventTypes.RoomTombstone)
                                  .parsedTombstoneContent
                                  .body,
                              maxLines: 1,
                              overflow: TextOverflow.ellipsis,
                            ),
                            subtitle: Text(L10n.of(context).goToTheNewRoom),
                            onTap: controller.goToNewRoomAction,
                          ),
                        ),
                      ),
                    Expanded(
                      child: FutureBuilder<bool>(
                        future: controller.getTimeline(),
                        builder: (BuildContext context, snapshot) {
                          if (controller.timeline == null) {
                            return Center(
                              child: CircularProgressIndicator(),
                            );
                          }

                          // create a map of eventId --> index to greatly improve performance of
                          // ListView's findChildIndexCallback
                          final thisEventsKeyMap = <String, int>{};
                          for (var i = 0;
                              i < controller.filteredEvents.length;
                              i++) {
                            thisEventsKeyMap[
                                controller.filteredEvents[i].eventId] = i;
                          }

                          return ListView.custom(
                            padding: EdgeInsets.only(
                              top: 16,
                              bottom: 4,
                            ),
                            reverse: true,
                            controller: controller.scrollController,
                            childrenDelegate: SliverChildBuilderDelegate(
                              (BuildContext context, int i) {
                                return i == controller.filteredEvents.length + 1
                                    ? controller.timeline.isRequestingHistory
                                        ? Container(
                                            height: 50,
                                            alignment: Alignment.center,
                                            padding: EdgeInsets.all(8),
                                            child: CircularProgressIndicator(),
                                          )
                                        : controller.canLoadMore
                                            ? TextButton(
                                                onPressed:
                                                    controller.requestHistory,
                                                child: Text(
                                                  L10n.of(context).loadMore,
                                                  style: TextStyle(
                                                    color: Theme.of(context)
                                                        .primaryColor,
                                                    fontWeight: FontWeight.bold,
                                                    decoration: TextDecoration
                                                        .underline,
                                                  ),
                                                ),
                                              )
                                            : Container()
                                    : i == 0
                                        ? StreamBuilder(
                                            stream:
                                                controller.room.onUpdate.stream,
                                            builder: (_, __) {
                                              final seenByText = controller.room
                                                  .getLocalizedSeenByText(
                                                context,
                                                controller.timeline,
                                                controller.filteredEvents,
                                                controller.unfolded,
                                              );
                                              return AnimatedContainer(
                                                height:
                                                    seenByText.isEmpty ? 0 : 24,
                                                duration: seenByText.isEmpty
                                                    ? Duration(milliseconds: 0)
                                                    : Duration(
                                                        milliseconds: 300),
                                                alignment: controller
                                                            .filteredEvents
                                                            .first
                                                            .senderId ==
                                                        client.userID
                                                    ? Alignment.topRight
                                                    : Alignment.topLeft,
                                                padding: EdgeInsets.only(
                                                  left: 8,
                                                  right: 8,
                                                  bottom: 8,
                                                ),
                                                child: Container(
                                                  padding: EdgeInsets.symmetric(
                                                      horizontal: 4),
                                                  decoration: BoxDecoration(
                                                    color: Theme.of(context)
                                                        .scaffoldBackgroundColor
                                                        .withOpacity(0.8),
                                                    borderRadius:
                                                        BorderRadius.circular(
                                                            4),
                                                  ),
                                                  child: Text(
                                                    seenByText,
                                                    maxLines: 1,
                                                    overflow:
                                                        TextOverflow.ellipsis,
                                                    style: TextStyle(
                                                      color: Theme.of(context)
                                                          .colorScheme
                                                          .secondary,
                                                    ),
                                                  ),
                                                ),
                                              );
                                            },
                                          )
                                        : AutoScrollTag(
                                            key: ValueKey(controller
                                                .filteredEvents[i - 1].eventId),
                                            index: i - 1,
                                            controller:
                                                controller.scrollController,
                                            child: Swipeable(
                                              key: ValueKey(controller
                                                  .filteredEvents[i - 1]
                                                  .eventId),
                                              background: Padding(
                                                padding: EdgeInsets.symmetric(
                                                    horizontal: 12.0),
                                                child: Center(
                                                  child: Icon(
                                                      Icons.reply_outlined),
                                                ),
                                              ),
                                              direction:
                                                  SwipeDirection.endToStart,
                                              onSwipe: (direction) =>
                                                  controller.replyAction(
                                                      replyTo: controller
                                                              .filteredEvents[
                                                          i - 1]),
                                              child: Message(
                                                  controller
                                                      .filteredEvents[i - 1],
                                                  onAvatarTab: (Event event) =>
                                                      showModalBottomSheet(
                                                        context: context,
                                                        builder: (c) =>
                                                            UserBottomSheet(
                                                          user: event.sender,
                                                          outerContext: context,
                                                          onMention: () => controller
                                                                  .sendController
                                                                  .text +=
                                                              '${event.senderId} ',
                                                        ),
                                                      ),
                                                  unfold: controller.unfold,
                                                  onSelect: controller
                                                      .onSelectMessage,
                                                  scrollToEventId: (String eventId) =>
                                                      controller.scrollToEventId(
                                                          eventId),
                                                  longPressSelect: controller
                                                      .selectedEvents.isEmpty,
                                                  selected: controller
                                                      .selectedEvents
                                                      .contains(
                                                          controller.filteredEvents[
                                                              i - 1]),
                                                  timeline: controller.timeline,
                                                  nextEvent: i >= 2
                                                      ? controller.filteredEvents[i - 2]
                                                      : null),
                                            ),
                                          );
                              },
                              childCount: controller.filteredEvents.length + 2,
                              findChildIndexCallback: (key) =>
                                  controller.findChildIndexCallback(
                                      key, thisEventsKeyMap),
                            ),
                          );
                        },
                      ),
                    ),
                    if (!controller.showEmojiPicker)
                      AnimatedContainer(
                        duration: Duration(milliseconds: 300),
                        height: (controller.editEvent == null &&
                                controller.replyEvent == null &&
                                controller.room.canSendDefaultMessages &&
                                controller.selectedEvents.length == 1)
                            ? 56
                            : 0,
                        child: Material(
                          color: Theme.of(context).secondaryHeaderColor,
                          child: Builder(builder: (context) {
                            if (!(controller.editEvent == null &&
                                controller.replyEvent == null &&
                                controller.selectedEvents.length == 1)) {
                              return Container();
                            }
                            final emojis = List<String>.from(AppEmojis.emojis);
                            final allReactionEvents = controller
                                .selectedEvents.first
                                .aggregatedEvents(controller.timeline,
                                    RelationshipTypes.reaction)
                                ?.where((event) =>
                                    event.senderId ==
                                        event.room.client.userID &&
                                    event.type == 'm.reaction');

                            allReactionEvents.forEach((event) {
                              try {
                                emojis.remove(
                                    event.content['m.relates_to']['key']);
                              } catch (_) {}
                            });
                            return ListView.builder(
                              scrollDirection: Axis.horizontal,
                              itemCount: emojis.length + 1,
                              itemBuilder: (c, i) => i == emojis.length
                                  ? InkWell(
                                      borderRadius: BorderRadius.circular(8),
                                      onTap: () => controller
                                          .pickEmojiAction(allReactionEvents),
                                      child: Container(
                                        width: 56,
                                        height: 56,
                                        alignment: Alignment.center,
                                        child: Icon(Icons.add_outlined),
                                      ),
                                    )
                                  : InkWell(
                                      borderRadius: BorderRadius.circular(8),
                                      onTap: () =>
                                          controller.sendEmojiAction(emojis[i]),
                                      child: Container(
                                        width: 56,
                                        height: 56,
                                        alignment: Alignment.center,
                                        child: Text(
                                          emojis[i],
                                          style: TextStyle(fontSize: 30),
                                        ),
                                      ),
                                    ),
                            );
                          }),
                        ),
                      ),
                    AnimatedContainer(
                      duration: Duration(milliseconds: 300),
                      height: controller.editEvent != null ||
                              controller.replyEvent != null
                          ? 56
                          : 0,
                      child: Material(
                        color: Theme.of(context).secondaryHeaderColor,
                        child: Row(
                          children: <Widget>[
                            IconButton(
                              tooltip: L10n.of(context).close,
                              icon: Icon(Icons.close),
                              onPressed: controller.cancelReplyEventAction,
                            ),
                            Expanded(
                              child: controller.replyEvent != null
                                  ? ReplyContent(controller.replyEvent,
                                      timeline: controller.timeline)
                                  : _EditContent(controller.editEvent
                                      ?.getDisplayEvent(controller.timeline)),
                            ),
                          ],
                        ),
                      ),
                    ),
                    Divider(
                      height: 1,
                      thickness: 1,
                    ),
                    if (controller.room.canSendDefaultMessages &&
                        controller.room.membership == Membership.join &&
                        !controller.showEmojiPicker)
                      Container(
                        decoration: BoxDecoration(
                          color: Theme.of(context).scaffoldBackgroundColor,
                        ),
                        child: Row(
                          crossAxisAlignment: CrossAxisAlignment.end,
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: controller.selectMode
                              ? <Widget>[
                                  Container(
                                    height: 56,
                                    child: TextButton(
                                      onPressed: controller.forwardEventsAction,
                                      child: Row(
                                        children: <Widget>[
                                          Icon(Icons
                                              .keyboard_arrow_left_outlined),
                                          Text(L10n.of(context).forward),
                                        ],
                                      ),
                                    ),
                                  ),
                                  controller.selectedEvents.length == 1
                                      ? controller.selectedEvents.first
                                                  .getDisplayEvent(
                                                      controller.timeline)
                                                  .status >
                                              0
                                          ? Container(
                                              height: 56,
                                              child: TextButton(
                                                onPressed:
                                                    controller.replyAction,
                                                child: Row(
                                                  children: <Widget>[
                                                    Text(
                                                        L10n.of(context).reply),
                                                    Icon(Icons
                                                        .keyboard_arrow_right),
                                                  ],
                                                ),
                                              ),
                                            )
                                          : Container(
                                              height: 56,
                                              child: TextButton(
                                                onPressed:
                                                    controller.sendAgainAction,
                                                child: Row(
                                                  children: <Widget>[
                                                    Text(L10n.of(context)
                                                        .tryToSendAgain),
                                                    SizedBox(width: 4),
                                                    Icon(Icons.send_outlined,
                                                        size: 16),
                                                  ],
                                                ),
                                              ),
                                            )
                                      : Container(),
                                ]
                              : <Widget>[
                                  AnimatedContainer(
                                    duration: Duration(milliseconds: 200),
                                    height: 56,
                                    width:
                                        controller.inputText.isEmpty ? 56 : 0,
                                    alignment: Alignment.center,
                                    clipBehavior: Clip.hardEdge,
                                    decoration: BoxDecoration(),
                                    child: PopupMenuButton<String>(
                                      icon: Icon(Icons.add_outlined),
                                      onSelected: controller
                                          .onAddPopupMenuButtonSelected,
                                      itemBuilder: (BuildContext context) =>
                                          <PopupMenuEntry<String>>[
                                        PopupMenuItem<String>(
                                          value: 'file',
                                          child: ListTile(
                                            leading: CircleAvatar(
                                              backgroundColor: Colors.green,
                                              foregroundColor: Colors.white,
                                              child: Icon(
                                                  Icons.attachment_outlined),
                                            ),
                                            title:
                                                Text(L10n.of(context).sendFile),
                                            contentPadding: EdgeInsets.all(0),
                                          ),
                                        ),
                                        PopupMenuItem<String>(
                                          value: 'image',
                                          child: ListTile(
                                            leading: CircleAvatar(
                                              backgroundColor: Colors.blue,
                                              foregroundColor: Colors.white,
                                              child: Icon(Icons.image_outlined),
                                            ),
                                            title: Text(
                                                L10n.of(context).sendImage),
                                            contentPadding: EdgeInsets.all(0),
                                          ),
                                        ),
                                        if (PlatformInfos.isMobile)
                                          PopupMenuItem<String>(
                                            value: 'camera',
                                            child: ListTile(
                                              leading: CircleAvatar(
                                                backgroundColor: Colors.purple,
                                                foregroundColor: Colors.white,
                                                child: Icon(
                                                    Icons.camera_alt_outlined),
                                              ),
                                              title: Text(
                                                  L10n.of(context).openCamera),
                                              contentPadding: EdgeInsets.all(0),
                                            ),
                                          ),
                                        if (PlatformInfos.isMobile)
                                          PopupMenuItem<String>(
                                            value: 'voice',
                                            child: ListTile(
                                              leading: CircleAvatar(
                                                backgroundColor: Colors.red,
                                                foregroundColor: Colors.white,
                                                child: Icon(
                                                    Icons.mic_none_outlined),
                                              ),
                                              title: Text(L10n.of(context)
                                                  .voiceMessage),
                                              contentPadding: EdgeInsets.all(0),
                                            ),
                                          ),
                                      ],
                                    ),
                                  ),
                                  Container(
                                    height: 56,
                                    alignment: Alignment.center,
                                    child: EncryptionButton(controller.room),
                                  ),
                                  Expanded(
                                    child: Padding(
                                      padding: const EdgeInsets.symmetric(
                                          vertical: 4.0),
                                      child: InputBar(
                                        room: controller.room,
                                        minLines: 1,
                                        maxLines: 8,
                                        autofocus: !PlatformInfos.isMobile,
                                        keyboardType: TextInputType.multiline,
                                        onSubmitted:
                                            controller.onInputBarSubmitted,
                                        focusNode: controller.inputFocus,
                                        controller: controller.sendController,
                                        decoration: InputDecoration(
                                          hintText:
                                              L10n.of(context).writeAMessage,
                                          hintMaxLines: 1,
                                          border: InputBorder.none,
                                          enabledBorder: InputBorder.none,
                                          filled: false,
                                        ),
                                        onChanged: controller.onInputBarChanged,
                                      ),
                                    ),
                                  ),
                                  if (PlatformInfos.isMobile &&
                                      controller.inputText.isEmpty)
                                    Container(
                                      height: 56,
                                      alignment: Alignment.center,
                                      child: IconButton(
                                        tooltip: L10n.of(context).voiceMessage,
                                        icon: Icon(Icons.mic_none_outlined),
                                        onPressed:
                                            controller.voiceMessageAction,
                                      ),
                                    ),
                                  if (!PlatformInfos.isMobile ||
                                      controller.inputText.isNotEmpty)
                                    Container(
                                      height: 56,
                                      alignment: Alignment.center,
                                      child: IconButton(
                                        icon: Icon(Icons.send_outlined),
                                        onPressed: controller.send,
                                        tooltip: L10n.of(context).send,
                                      ),
                                    ),
                                ],
                        ),
                      ),
                    AnimatedContainer(
                      duration: Duration(milliseconds: 300),
                      height: controller.showEmojiPicker
                          ? MediaQuery.of(context).size.height / 2
                          : 0,
                      child: controller.showEmojiPicker
                          ? EmojiPicker(
                              onEmojiSelected: controller.onEmojiSelected,
                              onBackspacePressed: controller.cancelEmojiPicker,
                            )
                          : null,
                    ),
                  ],
                ),
              ),
            ],
          ),
        ));
  }
}

class _EditContent extends StatelessWidget {
  final Event event;

  _EditContent(this.event);

  @override
  Widget build(BuildContext context) {
    if (event == null) {
      return Container();
    }
    return Row(
      children: <Widget>[
        Icon(
          Icons.edit,
          color: Theme.of(context).primaryColor,
        ),
        Container(width: 15.0),
        Text(
          event?.getLocalizedBody(
                MatrixLocals(L10n.of(context)),
                withSenderNamePrefix: false,
                hideReply: true,
              ) ??
              '',
          overflow: TextOverflow.ellipsis,
          maxLines: 1,
          style: TextStyle(
            color: Theme.of(context).textTheme.bodyText2.color,
          ),
        ),
      ],
    );
  }
}
