import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../../../utils/programmer_stats.dart';
import '../../../utils/programmer_task_ledger.dart';
import '../../../widgets/app_metric_card.dart';

/// A vertical list of KPI stat tiles for the programmer dashboard.
///
/// When [showSheetStats] is false only the first two tiles (today's focus and
/// completed-this-week) are shown; sheet-based tiles (streak, first-pass
/// approval, help given) are hidden and badges are computed without sheet data.
class StatTiles extends StatelessWidget {
  const StatTiles({
    super.key,
    required this.stats,
    required this.showSheetStats,
  });

  final ProgrammerStats stats;
  final bool showSheetStats;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final tiles = <Widget>[
      _buildFocusTile(context, cs),
      const SizedBox(height: 8),
      _buildCompletedTile(context),
    ];
    if (showSheetStats) {
      tiles.addAll([
        const SizedBox(height: 8),
        _buildStreakTile(context),
        const SizedBox(height: 8),
        _buildFirstPassTile(context),
        const SizedBox(height: 8),
        _buildHelpGivenTile(context),
      ]);
    }
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: tiles,
    );
  }

  Widget _buildFocusTile(BuildContext context, ColorScheme cs) {
    final progressValue =
        math.min(1.0, stats.todayFocus.inSeconds / (8 * 3600));
    final trailing = Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        SizedBox(
          width: 40,
          height: 40,
          child: CircularProgressIndicator(
            value: progressValue,
            strokeWidth: 6,
            backgroundColor: cs.surfaceContainerHighest,
            color: cs.primary,
            strokeCap: StrokeCap.round,
          ),
        ),
        const SizedBox(height: 4),
        Text(
          '/ 8h',
          style: Theme.of(context).textTheme.labelSmall?.copyWith(
                color: cs.onSurfaceVariant,
              ),
        ),
      ],
    );
    return AppMetricCard(
      title: "TODAY'S FOCUS",
      value: formatDurationHm(stats.todayFocus),
      trailing: trailing,
    );
  }

  Widget _buildCompletedTile(BuildContext context) {
    final diff = stats.completedThisWeek - stats.completedLastWeek;
    final String trailingText;
    if (diff > 0) {
      trailingText = '↑$diff vs last week';
    } else if (diff < 0) {
      trailingText = '↓${-diff} vs last week';
    } else {
      trailingText = 'Same as last week';
    }
    return AppMetricCard(
      title: 'COMPLETED THIS WEEK',
      value: stats.completedThisWeek.toString(),
      trailing: Text(
        trailingText,
        style: Theme.of(context).textTheme.labelMedium?.copyWith(
              color: Theme.of(context).colorScheme.onSurfaceVariant,
            ),
      ),
    );
  }

  Widget _buildStreakTile(BuildContext context) {
    final n = stats.currentStreak;
    final dayLabel = n == 1 ? '1 day' : '$n days';
    return AppMetricCard(
      title: 'STREAK',
      value: dayLabel,
      icon: Icons.local_fire_department_outlined,
      trailing: Text(
        'Best ${stats.bestStreak}',
        style: Theme.of(context).textTheme.labelMedium?.copyWith(
              color: Theme.of(context).colorScheme.onSurfaceVariant,
            ),
      ),
    );
  }

  Widget _buildFirstPassTile(BuildContext context) {
    final value = stats.firstPassRate != null
        ? '${(stats.firstPassRate! * 100).round()}%'
        : '—';
    return AppMetricCard(
      title: 'FIRST-PASS APPROVAL',
      value: value,
      trailing: Text(
        'Last 30 days',
        style: Theme.of(context).textTheme.labelMedium?.copyWith(
              color: Theme.of(context).colorScheme.onSurfaceVariant,
            ),
      ),
    );
  }

  Widget _buildHelpGivenTile(BuildContext context) {
    return AppMetricCard(
      title: 'HELP GIVEN',
      value: formatDurationHm(stats.helpGivenThisMonth),
      trailing: Text(
        'This month',
        style: Theme.of(context).textTheme.labelMedium?.copyWith(
              color: Theme.of(context).colorScheme.onSurfaceVariant,
            ),
      ),
    );
  }
}