import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../models/profile.model.dart';
import '../../../models/programmer_day_sheet.model.dart';
import '../../../models/programmer_task.model.dart';
import '../../../providers/leave_provider.dart';
import '../../../providers/profile_provider.dart';
import '../../../providers/programmer_day_data_provider.dart';
import '../../../providers/programmer_day_sheets_provider.dart';
import '../../../providers/programmer_tasks_provider.dart';
import '../../../utils/app_time.dart';
import '../../../utils/programmer_daily_time.dart';
import '../../../utils/programmer_day_rows.dart';
import '../../../utils/programmer_stats.dart';
import '../../../utils/staff_presence.dart';
import 'badges_strip.dart';
import 'now_working_card.dart';
import 'stat_tiles.dart';
import 'task_sections.dart';

/// The programmer's own work dashboard — hero card, stat tiles (Task 8), and
/// task sections. Drop it into the Mine tab with `userId: me`.
class ProgrammerDashboard extends ConsumerWidget {
  const ProgrammerDashboard({
    super.key,
    required this.userId,
    this.readOnly = false,
  });

  final String userId;
  final bool readOnly;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    // Drive 30-second rebuilds so duration values stay fresh.
    ref.watch(clockTickerProvider);

    final tasksAsync = ref.watch(programmerTasksProvider);
    final runStates = ref.watch(programmerRunStatesProvider);
    final todayKey = ref.watch(todayKeyProvider);
    final dayDataAsync = ref.watch(programmerDayDataProvider(todayKey));
    final profilesAsync = ref.watch(profilesProvider);

    final now = ref.watch(clockTickerProvider).valueOrNull ?? AppTime.now();

    final sheetsAsync = ref.watch(daySheetsForUserProvider(userId));
    final sheets = sheetsAsync.valueOrNull ?? const <ProgrammerDaySheet>[];

    final liveHelpThisMonthSec =
        ref.watch(helpGivenThisMonthProvider(userId)).valueOrNull;

    final tasks = tasksAsync.valueOrNull ?? const [];
    final profileById = <String, Profile>{
      for (final p in profilesAsync.valueOrNull ?? <Profile>[]) p.id: p,
    };
    final profileNames = <String, String>{
      for (final p in profilesAsync.valueOrNull ?? <Profile>[]) p.id: p.fullName,
    };

    final dayData = dayDataAsync.valueOrNull;
    final leaveDays = approvedLeaveDays(
      ref.watch(leavesProvider).valueOrNull ?? [],
      userId,
    );

    final todayRows = dayData == null
        ? const <DaySheetRow>[]
        : buildDayRows(
            userId: userId,
            day: todayKey,
            tasks: tasks,
            logsByTask: dayData.logsByTask,
            workLogs: dayData.workLogs,
            projectNames: const {},
            profileNames: profileNames,
            now: now,
          );
    final todayFocus = Duration(seconds: totalSeconds(todayRows));

    final stats = computeProgrammerStats(
      userId: userId,
      now: now,
      tasks: tasks,
      sheets: sheets,
      leaveDays: leaveDays,
      todayFocus: todayFocus,
      liveHelpThisMonthSec: liveHelpThisMonthSec,
    );

    final showSheetStats =
        ref.watch(currentProfileProvider).valueOrNull?.role == 'programmer';

    final badges = computeBadges(stats, includeSheetBadges: showSheetStats);

    final groups = groupTasksForDashboard(tasks, runStates, userId);
    final runningTask =
        groups.running.isNotEmpty ? groups.running.first : null;
    final nextUp =
        groups.notStarted.isNotEmpty ? groups.notStarted.first : null;

    final todayOnTask = _computeTodayDuration(
      runningTask: runningTask,
      dayDataAsync: dayDataAsync,
      userId: userId,
      todayKey: todayKey,
    );
    final totalOnTask = _computeTotalDuration(
      runningTask: runningTask,
      dayDataAsync: dayDataAsync,
      userId: userId,
    );

    return ListView(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      children: [
        NowWorkingCard(
          running: runningTask,
          nextUp: nextUp,
          todayOnTask: todayOnTask,
          totalOnTask: totalOnTask,
          readOnly: readOnly,
        ),
        const SizedBox(height: 16),
        StatTiles(stats: stats, showSheetStats: showSheetStats),
        const SizedBox(height: 8),
        BadgesStrip(badges: badges),
        const SizedBox(height: 16),
        TaskSections(
          groups: groups,
          profileById: profileById,
          readOnly: readOnly,
        ),
      ],
    );
  }

  Duration _computeTodayDuration({
    required ProgrammerTask? runningTask,
    required AsyncValue<dynamic> dayDataAsync,
    required String userId,
    required DateTime todayKey,
  }) {
    if (runningTask == null) return Duration.zero;
    final dayData = dayDataAsync.valueOrNull;
    if (dayData == null) return Duration.zero;
    final logs = dayData.logsByTask[runningTask.id] ?? const [];
    final dailyByAssignee = dailySecondsByAssignee(
      task: runningTask,
      logs: logs,
      now: DateTime.now().toUtc(),
    );
    final secs = dailyByAssignee[userId]?[todayKey] ?? 0;
    return Duration(seconds: secs);
  }

  Duration _computeTotalDuration({
    required ProgrammerTask? runningTask,
    required AsyncValue<dynamic> dayDataAsync,
    required String userId,
  }) {
    if (runningTask == null) return Duration.zero;
    final dayData = dayDataAsync.valueOrNull;
    if (dayData == null) return Duration.zero;
    final logs = dayData.logsByTask[runningTask.id] ?? const [];
    final dailyByAssignee = dailySecondsByAssignee(
      task: runningTask,
      logs: logs,
      now: DateTime.now().toUtc(),
    );
    final totalSecs =
        (dailyByAssignee[userId] ?? const {}).values.fold<int>(0, (s, v) => s + v);
    return Duration(seconds: totalSecs);
  }
}