import 'package:clide/builtin/shared/reader_chrome.dart';
import 'package:clide/builtin/tickets/src/ticket_colors.dart';
import 'package:clide/builtin/tickets/src/ticket_detail_controller.dart';
import 'package:clide/kernel/kernel.dart';
import 'package:clide/widgets/widgets.dart';
import 'package:flutter/widgets.dart';

class TicketDetailView extends StatefulWidget {
  const TicketDetailView({super.key, this.initialId});
  final String? initialId;

  @override
  State<TicketDetailView> createState() => _TicketDetailViewState();
}

class _TicketDetailViewState extends State<TicketDetailView> {
  TicketDetailController? _controller;
  ReaderNav? _nav;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_controller != null) return;
    final kernel = ClideKernel.of(context);
    _controller = TicketDetailController(ipc: kernel.ipc, messages: kernel.messages);
    _nav = kernel.readerNav.navFor('builtin.tickets', dataKey: 'id')..addListener(_onNavChanged);
    // Grab the entry the retained nav already holds (a selection that
    // revealed this tab before we mounted), else the initialId.
    final current = _nav!.current ?? widget.initialId;
    if (current != null) _controller!.load(current);
  }

  void _onNavChanged() {
    if (mounted) setState(() {}); // refresh action-bar button state
  }

  @override
  void dispose() {
    _nav?.removeListener(_onNavChanged);
    _controller?.dispose();
    super.dispose();
  }

  void _onBack() => _nav?.back();
  void _onForward() => _nav?.forward();
  void _onPin() => _nav?.togglePin();
  void _onJumpToPin() => _nav?.jumpToPin();

  void _navigateToRecord(BuildContext context, String id) {
    final kernel = ClideKernel.of(context);
    if (id.startsWith('T-')) {
      kernel.messages.publish('builtin.tickets', 'selection', {'id': id});
    } else {
      kernel.messages.publish('builtin.decisions', 'selection', {'id': id});
    }
  }

  @override
  Widget build(BuildContext context) {
    final c = _controller;
    if (c == null) return const SizedBox.shrink();
    return ListenableBuilder(
      listenable: c,
      builder: (ctx, _) {
        if (c.loading) return const Center(child: ClideText('Loading…', muted: true));
        final d = c.detail;
        if (d == null) return const Padding(padding: EdgeInsets.all(12), child: ClideText('Select a ticket to view details.', muted: true));

        final tokens = ClideTheme.of(ctx).surface;
        final isDark = ClideTheme.of(ctx).dark;
        final typeColors = TicketTypeColors.forTheme(dark: isDark);

        return ClidePaneChrome(
          title: d.id,
          subtitle: d.title,
          leading: ReaderPinButton(pinned: _nav?.hasPinned ?? false, onTap: _onPin),
          trailing: [
            ReaderActionBar(
              canGoBack: _nav?.canGoBack ?? false,
              canGoForward: _nav?.canGoForward ?? false,
              hasPinned: _nav?.hasPinned ?? false,
              onBack: (_nav?.canGoBack ?? false) ? _onBack : null,
              onForward: (_nav?.canGoForward ?? false) ? _onForward : null,
              onJumpToPin: (_nav?.hasPinned ?? false) ? _onJumpToPin : null,
              onEdit: null, // tickets are pql records, not files
            ),
          ],
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(12),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                _TicketHeader(detail: d, tokens: tokens, typeColors: typeColors),
                const SizedBox(height: 12),
                _StatusControls(detail: d, tokens: tokens, controller: c),
                if (d.description != null && d.description!.isNotEmpty) ...[
                  const SizedBox(height: 12),
                  ClideMarkdown(d.description!, onRecordTap: (id) => _navigateToRecord(ctx, id)),
                ],
                if (d.parents.isNotEmpty) ...[
                  const SizedBox(height: 16),
                  _SectionLabel(label: 'PARENT TREE', tokens: tokens),
                  const SizedBox(height: 6),
                  for (var i = 0; i < d.parents.length; i++) _CompactCard(data: d.parents[i], tokens: tokens, typeColors: typeColors, indent: i),
                ],
                if (d.decisions.isNotEmpty) ...[
                  const SizedBox(height: 16),
                  _SectionLabel(label: 'REFERENCED DECISIONS', tokens: tokens),
                  const SizedBox(height: 6),
                  for (final dec in d.decisions) _DecisionRefCard(data: dec, tokens: tokens),
                ],
              ],
            ),
          ),
        );
      },
    );
  }
}

class _TicketHeader extends StatelessWidget {
  const _TicketHeader({required this.detail, required this.tokens, required this.typeColors});
  final TicketDetail detail;
  final SurfaceTokens tokens;
  final TicketTypeColors typeColors;

  @override
  Widget build(BuildContext context) {
    final typeColor = typeColors.forType(detail.type);
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: tokens.panelBackground,
        borderRadius: BorderRadius.circular(4),
        border: Border.all(color: tokens.panelBorder),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              ClideTooltip(
                message: detail.type ?? 'task',
                child: Container(
                  width: 10,
                  height: 10,
                  decoration: BoxDecoration(color: typeColor, shape: BoxShape.circle),
                ),
              ),
              const SizedBox(width: 8),
              ClideText(detail.id, fontSize: clideFontSmall, color: typeColor, fontFamily: clideMonoFamily),
              const Spacer(),
              if (detail.priority != null) ClideText(detail.priority!, fontSize: clideFontSmall, color: tokens.globalTextMuted, fontFamily: clideMonoFamily),
            ],
          ),
          const SizedBox(height: 8),
          ClideText(detail.title, fontSize: 15, fontWeight: FontWeight.w500),
          if (detail.assignedTo != null) ...[
            const SizedBox(height: 6),
            ClideText('assigned: ${detail.assignedTo}', muted: true, fontSize: clideFontSmall, fontFamily: clideMonoFamily),
          ],
        ],
      ),
    );
  }
}

class _StatusControls extends StatelessWidget {
  const _StatusControls({required this.detail, required this.tokens, required this.controller});
  final TicketDetail detail;
  final SurfaceTokens tokens;
  final TicketDetailController controller;

  static const _statuses = ['backlog', 'ready', 'in_progress', 'review', 'done'];

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        for (final s in _statuses) ...[
          Expanded(
            child: ClideTappable(
              onTap: detail.status == s
                  ? null
                  : () async {
                      final resp = await controller.ipc.request(
                        'pql.tickets.status',
                        args: {
                          'ids': [detail.id],
                          'status': s,
                        },
                      );
                      if (resp.ok) {
                        controller.messages.publish('builtin.tickets', 'changed', {'id': detail.id});
                        await controller.load(detail.id);
                      }
                    },
              builder: (ctx, hovered, _) {
                final active = detail.status == s;
                final color = active ? tokens.statusInfo : (hovered ? tokens.globalForeground : tokens.globalTextMuted);
                return Container(
                  padding: const EdgeInsets.symmetric(vertical: 4),
                  decoration: BoxDecoration(
                    color: active ? tokens.statusInfo.withAlpha(0x30) : null,
                    borderRadius: BorderRadius.circular(3),
                    border: Border.all(color: active ? tokens.statusInfo : tokens.panelBorder),
                  ),
                  alignment: Alignment.center,
                  child: ClideText(_shortLabel(s), fontSize: clideFontBadge, color: color, fontFamily: clideMonoFamily),
                );
              },
            ),
          ),
          if (s != _statuses.last) const SizedBox(width: 4),
        ],
      ],
    );
  }

  static String _shortLabel(String s) => switch (s) {
    'backlog' => 'BACKLOG',
    'ready' => 'READY',
    'in_progress' => 'WIP',
    'review' => 'REVIEW',
    'done' => 'DONE',
    _ => s.toUpperCase(),
  };
}

class _SectionLabel extends StatelessWidget {
  const _SectionLabel({required this.label, required this.tokens});
  final String label;
  final SurfaceTokens tokens;

  @override
  Widget build(BuildContext context) {
    return ClideText(label, fontSize: clideFontSmall, color: tokens.sidebarSectionHeader, fontFamily: clideMonoFamily);
  }
}

class _CompactCard extends StatelessWidget {
  const _CompactCard({required this.data, required this.tokens, required this.typeColors, this.indent = 0});
  final Map<String, Object?> data;
  final SurfaceTokens tokens;
  final TicketTypeColors typeColors;
  final int indent;

  @override
  Widget build(BuildContext context) {
    final id = data['id'] as String? ?? '';
    final title = data['title'] as String? ?? '';
    final type = data['type'] as String?;
    final typeColor = typeColors.forType(type);
    return Padding(
      padding: EdgeInsets.only(left: indent * 12.0, bottom: 4),
      child: ClideTappable(
        onTap: () => ClideKernel.of(context).messages.publish('builtin.tickets', 'selection', {'id': id}),
        builder: (ctx, hovered, _) => Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
          decoration: BoxDecoration(
            color: hovered ? tokens.sidebarItemHover : tokens.panelBackground,
            borderRadius: BorderRadius.circular(4),
            border: Border.all(color: hovered ? tokens.panelActiveBorder : tokens.panelBorder),
          ),
          child: Row(
            children: [
              Container(
                width: 6,
                height: 6,
                decoration: BoxDecoration(color: typeColor, shape: BoxShape.circle),
              ),
              const SizedBox(width: 6),
              ClideText(id, fontSize: clideFontSmall, color: tokens.globalTextMuted, fontFamily: clideMonoFamily),
              const SizedBox(width: 8),
              Expanded(child: ClideText(title, fontSize: clideFontSmall)),
            ],
          ),
        ),
      ),
    );
  }
}

class _DecisionRefCard extends StatelessWidget {
  const _DecisionRefCard({required this.data, required this.tokens});
  final Map<String, Object?> data;
  final SurfaceTokens tokens;

  @override
  Widget build(BuildContext context) {
    final id = data['id'] as String? ?? '';
    final title = data['title'] as String? ?? '';
    final type = data['type'] as String?;
    final domain = data['domain'] as String?;
    final color = switch (type) {
      'confirmed' => tokens.statusSuccess,
      'question' => tokens.statusWarning,
      'rejected' => tokens.statusError,
      _ => tokens.globalTextMuted,
    };
    return Padding(
      padding: const EdgeInsets.only(bottom: 4),
      child: ClideTappable(
        onTap: () => ClideKernel.of(context).messages.publish('builtin.decisions', 'selection', {'id': id}),
        builder: (ctx, hovered, _) => Container(
          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
          decoration: BoxDecoration(
            color: hovered ? tokens.sidebarItemHover : tokens.panelBackground,
            borderRadius: BorderRadius.circular(4),
            border: Border.all(color: hovered ? tokens.panelActiveBorder : tokens.panelBorder),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Container(
                    width: 6,
                    height: 6,
                    decoration: BoxDecoration(color: color, shape: BoxShape.circle),
                  ),
                  const SizedBox(width: 6),
                  ClideText(id, fontSize: clideFontSmall, color: color, fontFamily: clideMonoFamily),
                  const Spacer(),
                  if (domain != null) ClideText(domain, fontSize: clideFontBadge, color: tokens.globalTextMuted, fontFamily: clideMonoFamily),
                ],
              ),
              const SizedBox(height: 3),
              ClideText(title, fontSize: clideFontSmall),
            ],
          ),
        ),
      ),
    );
  }
}