import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

import '../../shared/clipboard_utils.dart';
import '../../shared/mentions/agent_identity_provider.dart';
import '../../shared/l10n/l10n.dart';
import '../../shared/theme/theme.dart';
import '../../shared/widgets/buzz_loading_indicator.dart';
import '../../shared/widgets/modal_presentation.dart';
import '../../shared/widgets/sheet_divider.dart';
import 'channel.dart';
import 'channel_management_provider.dart';
import 'channel_mutes/channel_mutes_provider.dart';
import 'channel_sections/channel_sections_provider.dart';
import 'channel_stars/channel_stars_provider.dart';
import 'channels_provider.dart';
import 'manage_channel_sheet.dart';
import '../../shared/read_state/read_state_provider.dart';
import '../../shared/read_state/read_state_time.dart';

/// Opens the mobile channel actions sheet and returns whether its parent page
/// should close after a successful lifecycle action.
Future<bool?> showChannelActionsSheet({
  required BuildContext context,
  required Channel channel,
  required bool isUnread,
  VoidCallback? onMarkRead,
  String? sectionId,
}) => showBuzzModalBottomSheet<bool>(
  context: context,
  isScrollControlled: true,
  showDragHandle: true,
  constraints: BoxConstraints(
    maxWidth: 640,
    maxHeight: MediaQuery.sizeOf(context).height * 0.7,
  ),
  builder: (_) => ChannelActionsSheet(
    channel: channel,
    isUnread: isUnread,
    onMarkRead: onMarkRead,
    sectionId: sectionId,
  ),
);

/// Mobile action sheet for channel-level read, organization, and lifecycle
/// operations.
class ChannelActionsSheet extends ConsumerWidget {
  const ChannelActionsSheet({
    super.key,
    required this.channel,
    required this.isUnread,
    this.onMarkRead,
    this.sectionId,
  });

  final Channel channel;
  final bool isUnread;
  final VoidCallback? onMarkRead;
  final String? sectionId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final isMuted =
        ref.watch(channelMutesProvider).store.channels[channel.id]?.muted ==
        true;
    final isStarred =
        !channel.isDm &&
        ref.watch(channelStarsProvider).store.channels[channel.id]?.starred ==
            true;
    final membersAsync = channel.isDm
        ? const AsyncValue<List<ChannelMember>>.data([])
        : ref.watch(channelMembersProvider(channel.id));
    final agentOwnersAsync = channel.isDm
        ? const AsyncValue<Map<String, String>>.data({})
        : ref.watch(agentOwnersProvider);
    final currentPubkey = ref.watch(currentPubkeyProvider)?.toLowerCase();
    final currentMember = membersAsync.value?.cast<ChannelMember?>().firstWhere(
      (member) => member?.pubkey.toLowerCase() == currentPubkey,
      orElse: () => null,
    );
    final ownsOwnerAgent =
        currentPubkey != null &&
        membersAsync.value?.any(
              (member) =>
                  member.isOwner &&
                  agentOwnersAsync.value?[member.pubkey.toLowerCase()]
                          ?.toLowerCase() ==
                      currentPubkey,
            ) ==
            true;
    final canManageLifecycle =
        currentMember?.isElevated == true || ownsOwnerAgent;
    final canArchive = !channel.isArchived && canManageLifecycle;
    final canUnarchive = channel.isArchived && canManageLifecycle;
    final canDelete =
        !channel.isArchived &&
        (currentMember?.isOwner == true || ownsOwnerAgent);
    final lifecycleCapabilitiesLoading =
        membersAsync.isLoading || agentOwnersAsync.isLoading;
    final lifecycleCapabilitiesUnavailable =
        membersAsync.hasError || agentOwnersAsync.hasError;

    void close() => Navigator.of(context).pop();

    return SafeArea(
      top: false,
      child: IconTheme.merge(
        data: const IconThemeData(size: 22),
        child: SingleChildScrollView(
          padding: const EdgeInsets.fromLTRB(
            Grid.gutter,
            0,
            Grid.gutter,
            Grid.xs,
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              if (!channel.isDm) ...[
                _ChannelQuickActionsRow(
                  isStarred: isStarred,
                  isUnread: isUnread,
                  onToggleStar: () {
                    close();
                    final notifier = ref.read(channelStarsProvider.notifier);
                    isStarred
                        ? notifier.unstarChannel(channel.id)
                        : notifier.starChannel(channel.id);
                  },
                  onToggleRead: () {
                    close();
                    final timestamp = dateTimeToUnixSeconds(
                      channel.lastMessageAt,
                    );
                    if (isUnread) {
                      onMarkRead?.call();
                      if (timestamp != null) {
                        ref
                            .read(readStateProvider.notifier)
                            .markContextRead(
                              channel.id,
                              timestamp,
                              clearForcedMessages: true,
                            );
                        ref
                            .read(channelsProvider.notifier)
                            .clearObservedUnreadCoveredByRead(
                              channel.id,
                              timestamp,
                            );
                      }
                    } else {
                      ref
                          .read(readStateProvider.notifier)
                          .markContextUnread(channel.id, channelId: channel.id);
                    }
                  },
                ),
                const SizedBox(height: Grid.xs),
              ],
              if (!channel.isDm)
                ListTile(
                  contentPadding: EdgeInsets.zero,
                  leading: const Icon(LucideIcons.folderInput),
                  title: Text(context.l10n.moveToSection),
                  onTap: () async {
                    final pageContext = Navigator.of(
                      context,
                      rootNavigator: true,
                    ).context;
                    close();
                    await _showMoveSectionSheet(
                      pageContext,
                      ref,
                      channel: channel,
                      sectionId: sectionId,
                    );
                  },
                ),
              ListTile(
                contentPadding: EdgeInsets.zero,
                leading: Icon(isMuted ? LucideIcons.bell : LucideIcons.bellOff),
                title: Text(
                  isMuted
                      ? context.l10n.unmuteChannel
                      : context.l10n.muteChannel,
                ),
                onTap: () {
                  close();
                  final notifier = ref.read(channelMutesProvider.notifier);
                  isMuted
                      ? notifier.unmuteChannel(channel.id)
                      : notifier.muteChannel(channel.id);
                },
              ),
              if (!channel.isDm)
                ListTile(
                  contentPadding: EdgeInsets.zero,
                  leading: const Icon(LucideIcons.settings),
                  title: Text(context.l10n.manageChannel),
                  onTap: () async {
                    final shouldClose = await showBuzzModalBottomSheet<bool>(
                      context: context,
                      isScrollControlled: true,
                      showDragHandle: true,
                      constraints: BoxConstraints(
                        maxWidth: 640,
                        maxHeight: MediaQuery.sizeOf(context).height * 0.9,
                      ),
                      builder: (_) => ManageChannelSheet(channel: channel),
                    );
                    if (shouldClose == true && context.mounted) {
                      Navigator.of(context).pop(true);
                    }
                  },
                ),
              ListTile(
                contentPadding: EdgeInsets.zero,
                leading: const Icon(LucideIcons.copy),
                title: Text(context.l10n.copyChannelName),
                onTap: () {
                  close();
                  copyToClipboard(
                    context,
                    channel.name,
                    message: context.l10n.channelNameCopied,
                  );
                },
              ),
              ListTile(
                contentPadding: EdgeInsets.zero,
                leading: const Icon(LucideIcons.hash),
                title: Text(context.l10n.copyChannelId),
                onTap: () {
                  close();
                  copyToClipboard(
                    context,
                    channel.id,
                    message: context.l10n.channelIdCopied,
                  );
                },
              ),
              if (!channel.isDm) ...[
                const SheetDivider(),
                if (channel.isMember && !channel.isArchived)
                  _ActionTile(
                    icon: LucideIcons.logOut,
                    label: context.l10n.leaveChannelLabel,
                    destructive: true,
                    onTap: () => _confirmAndRun(
                      context,
                      ref,
                      title: context.l10n.leaveChannel(channel.name),
                      body: context.l10n.leaveChannelBody,
                      confirmLabel: context.l10n.leave,
                      action: () => ref
                          .read(channelActionsProvider)
                          .leaveChannel(channel.id),
                    ),
                  ),
                if (lifecycleCapabilitiesLoading)
                  ListTile(
                    enabled: false,
                    leading: BuzzLoadingIndicator(
                      size: 20,
                      semanticLabel: context.l10n.loadingChannelActions,
                    ),
                    title: Text(context.l10n.loadingChannelActions),
                  )
                else if (lifecycleCapabilitiesUnavailable)
                  ListTile(
                    enabled: false,
                    leading: Icon(LucideIcons.triangleAlert),
                    title: Text(context.l10n.channelActionsUnavailable),
                  )
                else ...[
                  if (canArchive)
                    _ActionTile(
                      icon: LucideIcons.archive,
                      label: context.l10n.archiveChannelLabel,
                      onTap: () => _confirmAndRun(
                        context,
                        ref,
                        title: context.l10n.archiveChannel(channel.name),
                        body: context.l10n.archiveChannelBody,
                        confirmLabel: context.l10n.archive,
                        action: () => ref
                            .read(channelActionsProvider)
                            .archiveChannel(channel.id),
                      ),
                    ),
                  if (canUnarchive)
                    _ActionTile(
                      icon: LucideIcons.archiveRestore,
                      label: context.l10n.unarchiveChannelLabel,
                      onTap: () => _confirmAndRun(
                        context,
                        ref,
                        title: context.l10n.unarchiveChannel(channel.name),
                        body: context.l10n.unarchiveChannelBody,
                        confirmLabel: context.l10n.unarchive,
                        action: () => ref
                            .read(channelActionsProvider)
                            .unarchiveChannel(channel.id),
                      ),
                    ),
                  if (canDelete)
                    _ActionTile(
                      icon: LucideIcons.trash2,
                      label: context.l10n.deleteChannelLabel,
                      destructive: true,
                      onTap: () => _confirmAndRun(
                        context,
                        ref,
                        title: context.l10n.deleteChannel(channel.name),
                        body: context.l10n.deleteChannelBody,
                        confirmLabel: context.l10n.delete,
                        action: () => ref
                            .read(channelActionsProvider)
                            .deleteChannel(channel.id),
                      ),
                    ),
                ],
              ],
            ],
          ),
        ),
      ),
    );
  }
}

class _ChannelQuickActionsRow extends StatelessWidget {
  const _ChannelQuickActionsRow({
    required this.isStarred,
    required this.isUnread,
    required this.onToggleStar,
    required this.onToggleRead,
  });

  final bool isStarred;
  final bool isUnread;
  final VoidCallback onToggleStar;
  final VoidCallback onToggleRead;

  @override
  Widget build(BuildContext context) => Row(
    children: [
      Expanded(
        child: _ChannelQuickAction(
          icon: isStarred ? LucideIcons.starOff : LucideIcons.star,
          label: isStarred ? context.l10n.unstar : context.l10n.star,
          onTap: onToggleStar,
        ),
      ),
      const SizedBox(width: Grid.twelve),
      Expanded(
        child: _ChannelQuickAction(
          icon: isUnread ? LucideIcons.checkCheck : LucideIcons.circleDot,
          label: isUnread ? context.l10n.markRead : context.l10n.markUnread,
          onTap: onToggleRead,
        ),
      ),
    ],
  );
}

class _ChannelQuickAction extends StatelessWidget {
  const _ChannelQuickAction({
    required this.icon,
    required this.label,
    required this.onTap,
  });

  final IconData icon;
  final String label;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) => GestureDetector(
    onTap: () {
      unawaited(HapticFeedback.lightImpact());
      onTap();
    },
    behavior: HitTestBehavior.opaque,
    child: Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Container(
          height: 68 + (Grid.xxs * 2),
          decoration: BoxDecoration(
            color: context.colors.surfaceContainerHighest,
            borderRadius: BorderRadius.circular(Radii.dialog),
          ),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Icon(icon, size: 22, color: context.colors.onSurface),
              const SizedBox(height: Grid.xxs),
              Text(
                label,
                maxLines: 1,
                overflow: TextOverflow.ellipsis,
                style: context.textTheme.labelMedium?.copyWith(
                  color: context.colors.onSurface,
                ),
              ),
            ],
          ),
        ),
      ],
    ),
  );
}

class _ActionTile extends StatelessWidget {
  const _ActionTile({
    required this.icon,
    required this.label,
    required this.onTap,
    this.destructive = false,
  });

  final IconData icon;
  final String label;
  final VoidCallback onTap;
  final bool destructive;

  @override
  Widget build(BuildContext context) => ListTile(
    contentPadding: EdgeInsets.zero,
    leading: Icon(icon, color: destructive ? context.colors.error : null),
    title: Text(
      label,
      style: destructive ? TextStyle(color: context.colors.error) : null,
    ),
    onTap: () {
      unawaited(HapticFeedback.lightImpact());
      onTap();
    },
  );
}

Future<void> _confirmAndRun(
  BuildContext sheetContext,
  WidgetRef ref, {
  required String title,
  required String body,
  required String confirmLabel,
  required Future<void> Function() action,
}) async {
  final pageContext = Navigator.of(sheetContext, rootNavigator: true).context;
  final confirmed = await showBuzzDialog<bool>(
    context: pageContext,
    builder: (dialogContext) => AlertDialog(
      title: Text(title),
      content: Text(body),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(dialogContext).pop(false),
          child: Text(dialogContext.l10n.cancel),
        ),
        FilledButton(
          onPressed: () => Navigator.of(dialogContext).pop(true),
          child: Text(confirmLabel),
        ),
      ],
    ),
  );
  if (confirmed != true) return;
  try {
    await action();
    if (pageContext.mounted) Navigator.of(pageContext).pop(true);
  } catch (error) {
    if (!pageContext.mounted) return;
    ScaffoldMessenger.of(pageContext).showSnackBar(
      SnackBar(
        content: Text(
          pageContext.l10n.actionFailed(confirmLabel),
        ),
      ),
    );
  }
}

Future<void> _showMoveSectionSheet(
  BuildContext context,
  WidgetRef ref, {
  required Channel channel,
  required String? sectionId,
}) async {
  final sections = [...ref.read(channelSectionsProvider).store.sections]
    ..sort((a, b) => a.order.compareTo(b.order));
  await showBuzzModalBottomSheet<void>(
    context: context,
    showDragHandle: true,
    builder: (sheetContext) => SafeArea(
      child: IconTheme.merge(
        data: const IconThemeData(size: 22),
        child: SingleChildScrollView(
          padding: const EdgeInsets.fromLTRB(
            Grid.gutter,
            0,
            Grid.gutter,
            Grid.xs,
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              for (final section in sections)
                ListTile(
                  leading: const Icon(LucideIcons.folder),
                  title: Text(section.name),
                  trailing: sectionId == section.id
                      ? Icon(
                          LucideIcons.check,
                          color: sheetContext.colors.primary,
                        )
                      : null,
                  onTap: () {
                    Navigator.of(sheetContext).pop();
                    ref
                        .read(channelSectionsProvider.notifier)
                        .assignChannel(channel.id, section.id);
                  },
                ),
              ListTile(
                leading: const Icon(LucideIcons.folderPlus),
                title: Text(context.l10n.newSection),
                onTap: () async {
                  Navigator.of(sheetContext).pop();
                  final name = await _showSectionNameDialog(context);
                  if (name == null || name.isEmpty) return;
                  final notifier = ref.read(channelSectionsProvider.notifier);
                  notifier.createSection(name);
                  final created = ref
                      .read(channelSectionsProvider)
                      .store
                      .sections
                      .where((section) => section.name == name.trim())
                      .lastOrNull;
                  if (created != null) {
                    notifier.assignChannel(channel.id, created.id);
                  }
                },
              ),
              if (sectionId != null)
                ListTile(
                  leading: const Icon(LucideIcons.folderMinus),
                  title: Text(context.l10n.removeFromSection),
                  onTap: () {
                    Navigator.of(sheetContext).pop();
                    ref
                        .read(channelSectionsProvider.notifier)
                        .unassignChannel(channel.id);
                  },
                ),
            ],
          ),
        ),
      ),
    ),
  );
}

Future<String?> _showSectionNameDialog(BuildContext context) async {
  final controller = TextEditingController();
  final result = await showBuzzDialog<String>(
    context: context,
    builder: (dialogContext) => AlertDialog(
      title: Text(context.l10n.newSectionTitle),
      content: TextField(controller: controller, autofocus: true),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(dialogContext).pop(),
          child: Text(context.l10n.cancel),
        ),
        FilledButton(
          onPressed: () =>
              Navigator.of(dialogContext).pop(controller.text.trim()),
          child: Text(context.l10n.create),
        ),
      ],
    ),
  );
  controller.dispose();
  return result;
}