import 'dart:async';

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

import '../../shared/custom_emoji/custom_emoji_provider.dart';
import '../../shared/custom_emoji/custom_emoji_render.dart';
import '../../shared/l10n/l10n.dart';
import '../../shared/theme/theme.dart';
import '../../shared/widgets/avatar_image.dart';
import '../../shared/widgets/anchored_popover_menu.dart';
import '../../shared/widgets/masked_avatar_badge.dart';
import 'profile_provider.dart';
import 'set_status_sheet.dart';
import 'user_status_provider.dart';

/// Desktop's settings-avatar treatment (`ProfileSettingsCard`): a large centred
/// avatar with a circular badge notched out of its bottom-right corner. Desktop
/// puts an edit-photo pencil in that badge; here it carries the status glyph and
/// opens the status sheet instead. The notch shape — including the fillets where
/// it meets the avatar's edge — comes from [AvatarBadgeMaskGeometry.badge].
class SettingsProfileHeader extends ConsumerWidget {
  const SettingsProfileHeader({super.key});

  static const _avatarSize = 128.0;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final profile = ref.watch(profileProvider).asData?.value;
    final status = ref.watch(userStatusProvider).asData?.value;
    final hasStatus = status != null && !status.isEmpty;
    final presence = ref.watch(presenceProvider).value ?? 'offline';

    void openStatusSheet() =>
        showSetStatusSheet(context, currentStatus: status);

    return Padding(
      padding: const EdgeInsets.only(top: Grid.sm, bottom: Grid.sm),
      child: Column(
        children: [
          MaskedAvatarBadge(
            size: _avatarSize,
            avatar: ColoredBox(
              color: context.colors.primaryContainer,
              child: AvatarImageContent(
                imageUrl: profile?.avatarUrl,
                fallback: Text(
                  profile?.initial ?? '?',
                  style: context.textTheme.displaySmall?.copyWith(
                    color: context.colors.onPrimaryContainer,
                  ),
                ),
              ),
            ),
            badge: _StatusBadge(
              emoji: status?.emoji ?? '',
              onTap: openStatusSheet,
            ),
          ),
          const SizedBox(height: Grid.twelve),
          Text(
            profile?.label ?? context.l10n.yourProfile,
            style: context.textTheme.titleMedium,
            textAlign: TextAlign.center,
          ),
          // Keep the status text visible even when no emoji is set. NIP-38
          // permits text-only statuses, which the avatar badge cannot represent.
          if (hasStatus)
            GestureDetector(
              onTap: openStatusSheet,
              child: Padding(
                padding: const EdgeInsets.only(
                  top: Grid.quarter,
                  left: Grid.gutter,
                  right: Grid.gutter,
                  bottom: Grid.half,
                ),
                child: Text(
                  status.text.isNotEmpty ? status.text : status.emoji,
                  style: context.textTheme.bodySmall?.copyWith(
                    color: context.colors.onSurfaceVariant,
                  ),
                  textAlign: TextAlign.center,
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                ),
              ),
            ),
          _PresencePill(
            presence: presence,
            onSelected: (nextPresence) => unawaited(
              ref.read(presenceProvider.notifier).setPresence(nextPresence),
            ),
          ),
        ],
      ),
    );
  }
}

class _PresencePill extends StatelessWidget {
  const _PresencePill({required this.presence, required this.onSelected});

  final String presence;
  final ValueChanged<String> onSelected;

  @override
  Widget build(BuildContext context) {
    final effectivePresence = switch (presence) {
      'online' || 'away' => presence,
      _ => 'offline',
    };
    final (backgroundColor, foregroundColor) = switch (effectivePresence) {
      'online' => (
        context.appColors.success.withValues(alpha: 0.15),
        context.appColors.success,
      ),
      'away' => (
        context.appColors.warning.withValues(alpha: 0.15),
        context.appColors.warning,
      ),
      _ => (
        context.colors.onSurfaceVariant.withValues(alpha: 0.15),
        context.colors.onSurfaceVariant,
      ),
    };
    final label = _presenceLabel(context, effectivePresence);

    return Builder(
      builder: (buttonContext) => Semantics(
        button: true,
        label: context.l10n.presenceLabel(label),
        child: SizedBox(
          key: const ValueKey('settings-presence-target'),
          height: Grid.xl,
          child: Material(
            color: Colors.transparent,
            child: InkWell(
              key: const ValueKey('settings-presence-menu'),
              borderRadius: BorderRadius.circular(Radii.full),
              onTap: () async {
                final selected = await showAnchoredPopover<String>(
                  context: buttonContext,
                  width: 176,
                  alignment: AnchoredPopoverAlignment.center,
                  offset: const Offset(0, Grid.half),
                  menuPadding: const EdgeInsets.symmetric(vertical: Grid.half),
                  surfaceKey: const ValueKey('settings-presence-popover'),
                  items: [
                    for (final option in const ['online', 'away', 'offline'])
                      PopupMenuItem<String>(
                        key: ValueKey('settings-presence-$option'),
                        value: option,
                        height: Grid.xl,
                        padding: const EdgeInsets.symmetric(
                          horizontal: Grid.twelve,
                        ),
                        child: Row(
                          children: [
                            Container(
                              width: 10,
                              height: 10,
                              decoration: BoxDecoration(
                                color: _presenceColor(context, option),
                                shape: BoxShape.circle,
                              ),
                            ),
                            const SizedBox(width: Grid.xxs),
                            Expanded(
                              child: Text(
                                _presenceLabel(context, option),
                                style: filterChipTextStyle.copyWith(
                                  color: context.colors.onSurface,
                                  fontWeight: option == effectivePresence
                                      ? FontWeight.w500
                                      : FontWeight.w400,
                                ),
                              ),
                            ),
                            if (option == effectivePresence)
                              Icon(
                                LucideIcons.check,
                                size: 16,
                                color: context.colors.primary,
                              ),
                          ],
                        ),
                      ),
                  ],
                );
                if (buttonContext.mounted && selected != null) {
                  onSelected(selected);
                }
              },
              child: Center(
                child: Material(
                  key: const ValueKey('settings-presence-pill'),
                  color: backgroundColor,
                  borderRadius: BorderRadius.circular(Radii.full),
                  child: Padding(
                    padding: const EdgeInsets.symmetric(
                      horizontal: Grid.xs,
                      vertical: Grid.xxs,
                    ),
                    child: Text(
                      label,
                      key: const ValueKey('settings-presence-label'),
                      style: filterChipTextStyle.copyWith(
                        color: foregroundColor,
                        fontWeight: FontWeight.w500,
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

String _presenceLabel(BuildContext context, String presence) =>
    switch (presence) {
      'online' => context.l10n.online,
      'away' => context.l10n.away,
      _ => context.l10n.offline,
    };

Color _presenceColor(BuildContext context, String presence) =>
    switch (presence) {
      'online' => context.appColors.success,
      'away' => context.appColors.warning,
      _ => context.colors.outline,
    };

/// Fills the notch left by [MaskedAvatarBadge], so its size comes from the mask
/// geometry rather than being set here.
class _StatusBadge extends StatelessWidget {
  const _StatusBadge({required this.emoji, required this.onTap});

  final String emoji;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return Semantics(
      button: true,
      label: context.l10n.setStatusLabel,
      child: GestureDetector(
        onTap: onTap,
        child: DecoratedBox(
          decoration: BoxDecoration(
            color: context.colors.surfaceContainerHighest,
            shape: BoxShape.circle,
          ),
          child: Center(child: _StatusGlyph(emoji: emoji)),
        ),
      ),
    );
  }
}

/// The status emoji, resolving `:shortcode:` values against the community's
/// custom emoji. Falls back to the add-status icon when no status is set.
class _StatusGlyph extends ConsumerWidget {
  const _StatusGlyph({required this.emoji});

  final String emoji;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    if (emoji.isEmpty) {
      return Icon(
        LucideIcons.smilePlus,
        size: 20,
        color: context.colors.onSurfaceVariant,
      );
    }

    final shortcode = emoji.startsWith(':') && emoji.endsWith(':')
        ? emoji.substring(1, emoji.length - 1).toLowerCase()
        : null;
    if (shortcode != null) {
      for (final entry in ref.watch(customEmojiListProvider)) {
        if (entry.shortcode == shortcode) {
          return CustomEmojiImage(
            shortcode: shortcode,
            url: entry.url,
            size: 22,
          );
        }
      }
      return Icon(
        LucideIcons.smile,
        size: 20,
        color: context.colors.onSurfaceVariant,
      );
    }

    return Text(emoji, style: const TextStyle(fontSize: 20));
  }
}