import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:stacked/stacked.dart';

import '../../about/external/data/RoutineStep.dart';
import '../../about/internal/application/NotificationType.dart';
import '../../about/internal/application/RoutineKind.dart';
import '../../about/internal/application/RoutinePhase.dart';
import '../../about/internal/application/RoutineRun.dart';
import '../../about/internal/application/StepMode.dart';
import '../../about/internal/application/TextType.dart';
import '../../designs/Component.dart';
import '../../designs/ProgressRing.dart';
import '../../designs/Shell.dart';
import '../../designs/buttons/Buttons.dart';
import '../../designs/text/Text.dart';
import '../../utils/Colors.dart';
import '../../utils/CommonUtils.dart';
import '../../utils/Thresholds.dart';
import 'ConnectRoutineRunner.dart';
import 'RoutineRunner.dart';
import 'ViewRoutineRunner.dart';

/// The routine player. A coloured stage carries the phase — a ring that
/// drains for timed work, a breathing circle for meditation — and the sheet
/// beneath it carries the chain: where you are, what is next, and the clock.
class RoutineRunnerState extends State<RoutineRunner>
    with WidgetsBindingObserver, SingleTickerProviderStateMixin
    implements ConnectRoutineRunner {
  ViewRoutineRunner? _model;

  late RoutineRun _run;

  Timer? _ticker;

  /// Drives repaint only; every value shown is derived from wall-clock.
  int _tick = 0;

  /// The last whole second a countdown haptic fired on, so each fires once.
  int _lastBuzz = -1;

  bool _haptics = true;

  bool _finished = false;

  late AnimationController _breath;

  final ScrollController _carousel = ScrollController();

  static const double _carouselItem = 76;

  /// Run time below which leaving logs nothing — opening the player by
  /// mistake is not a broken chain.
  static const int _graceSeconds = 30;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);

    _run = RoutineRun(widget.routine);
    for (RoutineStep step in _run.chain.steps) {
      step.completed = false;
    }

    // Box breathing: four seconds in, four out.
    _breath = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 4),
    );

    _run.resume();
  }

  @override
  Widget build(BuildContext context) {
    return ViewModelBuilder<ViewRoutineRunner>.reactive(
      viewModelBuilder: () => ViewRoutineRunner(context, this),
      onViewModelReady: (viewModel) {
        _model = viewModel;
        _initiate();
      },
      builder: (context, viewModel, child) => PopScope(
        // Leaving mid-chain is a decision, not a back gesture.
        canPop: false,
        onPopInvokedWithResult: (didPop, result) {
          if (!didPop) {
            _onRequestExit();
          }
        },
        child: AnnotatedRegion<SystemUiOverlayStyle>(
          value: SystemUiOverlayStyle.light,
          child: Scaffold(
            backgroundColor: kindDeep(_run.chain.kind),
            body: _finished ? _summaryView() : _runnerView(),
          ),
        ),
      ),
    );
  }

  void _initiate() {
    _startTicker();
    _syncBreath();
    _model?.publishRun(_run);
  }

  void _startTicker() {
    _ticker?.cancel();
    _ticker = Timer.periodic(const Duration(milliseconds: 250), _onTick);
  }

  void _onTick(Timer timer) {
    if (!mounted || _finished) {
      return;
    }

    if (_run.running && _run.phase.countsDown) {
      final int remaining = _run.phaseRemaining();

      if (remaining <= Thresholds.routineCountdownSeconds &&
          remaining > 0 &&
          remaining != _lastBuzz) {
        _lastBuzz = remaining;
        _buzz(light: true);
      }

      if (_run.phaseFinished()) {
        _advance(skipped: false);
        return;
      }
    }

    setState(() {
      _tick = _tick + 1;
    });

    // Refresh the lock-screen notification every ~5s rather than every tick.
    if (_tick % 20 == 0 && _run.running) {
      _model?.publishRun(_run);
    }
  }

  /// Backgrounding pauses the run and is counted, exactly as for a single
  /// task — that is what makes a logged routine mean anything.
  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (_finished) {
      return;
    }

    if (state == AppLifecycleState.resumed) {
      return;
    }

    if (state == AppLifecycleState.paused ||
        state == AppLifecycleState.hidden) {
      if (_run.running) {
        setState(() {
          _run.pause();
          _run.backgroundedCount = _run.backgroundedCount + 1;
        });
        _syncBreath();
        _model?.publishRun(_run);
      }
    }
  }

  // ── Flow ──────────────────────────────────────────────────────────────────

  void _advance({required bool skipped}) {
    final bool more = _run.advance(skipped: skipped);
    _lastBuzz = -1;

    if (!more) {
      _finish();
      return;
    }

    _buzz(light: false);

    setState(() {});
    _syncBreath();
    _syncCarousel();
    _model?.publishRun(_run);
  }

  void _finish() {
    _run.pause();
    _ticker?.cancel();
    _breath.stop();
    _buzz(light: false);
    _model?.clearRun();

    setState(() {
      _finished = true;
    });
  }

  void _buzz({required bool light}) {
    if (!_haptics) {
      return;
    }
    if (light) {
      HapticFeedback.selectionClick();
    } else {
      HapticFeedback.heavyImpact();
    }
  }

  /// The breathing circle only moves while a meditation phase is running.
  void _syncBreath() {
    final bool breathe = _run.chain.kind == RoutineKind.Meditation &&
        _run.running &&
        !_run.phase.rest &&
        !_finished;

    if (breathe && !_breath.isAnimating) {
      _breath.repeat(reverse: true);
    } else if (!breathe && _breath.isAnimating) {
      _breath.stop();
    }
  }

  /// Keep the current step centred in the carousel.
  void _syncCarousel() {
    if (!_carousel.hasClients) {
      return;
    }
    final double viewport = _carousel.position.viewportDimension;
    final double target = (_run.phase.stepIndex * _carouselItem) -
        (viewport / 2) +
        (_carouselItem / 2);

    _carousel.animateTo(
      target.clamp(0, _carousel.position.maxScrollExtent),
      duration: const Duration(milliseconds: 350),
      curve: Curves.easeOutCubic,
    );
  }

  // ── Handlers ──────────────────────────────────────────────────────────────

  void _onTogglePause() {
    setState(() {
      if (_run.running) {
        _run.pause();
      } else {
        _run.resume();
      }
    });
    _syncBreath();
    _model?.publishRun(_run);
  }

  /// The primary pill: pause/play on a countdown, "done" on anything that
  /// waits for you.
  void _onPrimary() {
    if (_run.phase.countsDown) {
      _onTogglePause();
      return;
    }
    if (!_run.running) {
      _run.resume();
    }
    _advance(skipped: false);
  }

  void _onNext() {
    // Skipping rest is not skipping work, so it is not counted as a skip.
    _advance(skipped: !_run.phase.rest);
  }

  void _onPrevious() {
    setState(() {
      _run.back();
      _lastBuzz = -1;
    });
    _syncBreath();
    _syncCarousel();
    _model?.publishRun(_run);
  }

  void _onToggleHaptics() {
    setState(() {
      _haptics = !_haptics;
    });
  }

  void _onJumpTo(int stepIndex) {
    setState(() {
      _run.jumpTo(stepIndex);
      _lastBuzz = -1;
    });
    _syncBreath();
    _syncCarousel();
    _model?.publishRun(_run);
  }

  void _onRequestExit() {
    if (_finished) {
      Navigator.pop(context, false);
      return;
    }

    final bool worthLogging = _run.elapsedSeconds() >= _graceSeconds;
    final int done = _run.chain.completedSteps;
    final int total = _run.chain.steps.length;

    _model?.showApplicationNotification(
      NotificationType.warning,
      "Break the chain here?",
      worthLogging
          ? "$done of $total steps done. Stopping now logs this run as partial at step ${_run.phase.stepIndex + 1} — it does not disappear."
          : "Nothing has been done yet, so leaving now logs nothing.",
      true,
      true,
      null,
      action: worthLogging ? "Stop and log" : "Leave",
      positiveAction: _onConfirmExit,
    );
  }

  void _onConfirmExit() {
    Navigator.pop(context);

    if (_run.elapsedSeconds() < _graceSeconds) {
      _model?.clearRun();
      Navigator.pop(context, false);
      return;
    }

    _run.pause();
    _model?.log(_run);
  }

  void _onLog() {
    _model?.log(_run);
  }

  void _onOpenSteps() {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      barrierColor: colorBlack.withValues(alpha: 0.55),
      builder: (BuildContext sheetContext) => _stepsSheet(sheetContext),
    );
  }

  // ── Views ─────────────────────────────────────────────────────────────────

  Widget _runnerView() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        Expanded(flex: 5, child: _stage()),
        Expanded(flex: 6, child: _panel()),
      ],
    );
  }

  /// The top half: kind gradient, chrome controls and the phase visual.
  Widget _stage() {
    final RoutineKind kind = _run.chain.kind;

    return Container(
      decoration: BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topCenter,
          end: Alignment.bottomCenter,
          colors: <Color>[
            _run.phase.rest ? colorPrimaryDark2 : kindColor(kind),
            kindDeep(kind),
          ],
        ),
      ),
      child: SafeArea(
        bottom: false,
        child: Padding(
          padding: const EdgeInsets.fromLTRB(16, 4, 16, 18),
          child: Column(
            children: [
              Row(
                children: [
                  chromeAction(CupertinoIcons.xmark, _onRequestExit),
                  Expanded(child: Center(child: _totalPill())),
                  chromeAction(CupertinoIcons.list_bullet, _onOpenSteps),
                ],
              ),
              Expanded(
                child: Center(
                  child: kind == RoutineKind.Meditation && !_run.phase.rest
                      ? _breathingCircle()
                      : _phaseRing(),
                ),
              ),
              _stageStatus(),
            ],
          ),
        ),
      ),
    );
  }

  /// Total elapsed and planned remaining — the reference's "Time" pill.
  Widget _totalPill() {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 9),
      decoration: BoxDecoration(
        color: colorWhite.withValues(alpha: 0.12),
        borderRadius: BorderRadius.circular(999),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(CupertinoIcons.time, size: 13, color: colorWhite),
          const SizedBox(width: 6),
          text(formatClock(_run.elapsedSeconds()), 13, TextType.Medium,
              color: colorWhite),
          Container(
            width: 3,
            height: 3,
            margin: const EdgeInsets.symmetric(horizontal: 8),
            decoration: BoxDecoration(
              color: colorWhite.withValues(alpha: 0.45),
              shape: BoxShape.circle,
            ),
          ),
          text("~${formatClock(_run.plannedRemaining())} left", 12,
              TextType.Regular,
              color: colorWhite.withValues(alpha: 0.6)),
        ],
      ),
    );
  }

  Widget _phaseRing() {
    final RoutinePhase phase = _run.phase;

    return Stack(
      alignment: Alignment.center,
      children: [
        Container(
          width: 236,
          height: 236,
          decoration: BoxDecoration(
            shape: BoxShape.circle,
            color: colorWhite.withValues(alpha: 0.04),
          ),
        ),
        ProgressRing(
          fraction: phase.countsDown ? _run.phaseProgress() : 0,
          size: 208,
          stroke: 4,
          fill: colorWhite,
          track: colorWhite.withValues(alpha: 0.12),
          child: Container(
            width: 166,
            height: 166,
            alignment: Alignment.center,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: colorWhite.withValues(alpha: 0.08),
            ),
            child: phase.rest
                ? Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(CupertinoIcons.wind,
                          size: 34, color: colorWhite.withValues(alpha: 0.8)),
                      const SizedBox(height: 8),
                      text("REST", 11, TextType.Bold,
                          color: colorWhite.withValues(alpha: 0.7),
                          letterSpacing: 2),
                    ],
                  )
                : Icon(
                    phase.step.mode == StepMode.Check
                        ? CupertinoIcons.checkmark_alt
                        : kindIcon(_run.chain.kind),
                    size: 64,
                    color: colorWhite,
                  ),
          ),
        ),
      ],
    );
  }

  Widget _breathingCircle() {
    return AnimatedBuilder(
      animation: _breath,
      builder: (context, child) {
        final double t = Curves.easeInOut.transform(_breath.value);
        final bool inhaling = _breath.status == AnimationStatus.forward;

        return Stack(
          alignment: Alignment.center,
          children: [
            Container(
              width: 150 + 90 * t,
              height: 150 + 90 * t,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: colorWhite.withValues(alpha: 0.05),
              ),
            ),
            Container(
              width: 130 + 60 * t,
              height: 130 + 60 * t,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: colorWhite.withValues(alpha: 0.10),
                border: Border.all(
                    color: colorWhite.withValues(alpha: 0.25), width: 1),
              ),
            ),
            text(
              !_run.running
                  ? "Paused"
                  : inhaling
                      ? "Breathe in"
                      : "Breathe out",
              17,
              TextType.Light,
              color: colorWhite,
            ),
          ],
        );
      },
    );
  }

  Widget _stageStatus() {
    final String status = !_run.running
        ? "PAUSED"
        : _run.phase.rest
            ? "RESTING"
            : "IN PROGRESS";

    return Row(
      children: [
        Container(
          width: 7,
          height: 7,
          decoration: BoxDecoration(
            color: _run.running ? colorWhite : colorWarning,
            shape: BoxShape.circle,
          ),
        ),
        const SizedBox(width: 8),
        text(status, 9, TextType.Bold,
            color: colorWhite.withValues(alpha: 0.6), letterSpacing: 1.4),
        if (_run.backgroundedCount > 0) ...[
          const SizedBox(width: 10),
          pill("Left ${_run.backgroundedCount}×", colorWarning,
              colorWarning.withValues(alpha: 0.14),
              textSize: 9),
        ],
        const Spacer(),
        GestureDetector(
          onTap: _onTogglePause,
          child: pill(
            _run.running ? "Pause" : "Resume",
            colorWhite,
            colorWhite.withValues(alpha: 0.12),
            icon: _run.running
                ? CupertinoIcons.pause_fill
                : CupertinoIcons.play_fill,
            textSize: 9,
          ),
        ),
      ],
    );
  }

  /// The bottom sheet: chain carousel, step counter, clock and transport.
  Widget _panel() {
    final RoutinePhase phase = _run.phase;
    final Color tone = kindColor(_run.chain.kind);

    return Container(
      decoration: BoxDecoration(
        color: colorPrimaryLight,
        borderRadius: BorderRadius.only(
          topLeft: Radius.circular(28),
          topRight: Radius.circular(28),
        ),
      ),
      child: SafeArea(
        top: false,
        child: Column(
          children: [
            const SizedBox(height: 14),
            _stepCarousel(),
            const SizedBox(height: 4),
            Expanded(
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 24),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        text(
                          "${phase.stepIndex + 1} OF ${_run.chain.steps.length}",
                          10,
                          TextType.Bold,
                          color: colorGrey2,
                          letterSpacing: 1.4,
                        ),
                        const SizedBox(height: 6),
                        text(
                          phase.rest ? "Rest" : phase.step.title,
                          24,
                          TextType.Light,
                          color: colorPrimaryDark,
                          align: TextAlign.center,
                          maxLines: 2,
                          overflow: TextOverflow.ellipsis,
                        ),
                        if (phase.step.sets > 1) ...[
                          const SizedBox(height: 10),
                          _setDots(phase, tone),
                        ],
                      ],
                    ),
                    _clock(phase, tone),
                    _caption(phase),
                  ],
                ),
              ),
            ),
            _transport(phase, tone),
            const SizedBox(height: 14),
          ],
        ),
      ),
    );
  }

  Widget _stepCarousel() {
    final List<RoutineStep> steps = _run.chain.steps;

    return SizedBox(
      height: 84,
      child: ListView.builder(
        controller: _carousel,
        scrollDirection: Axis.horizontal,
        padding: const EdgeInsets.symmetric(horizontal: 12),
        itemCount: steps.length,
        itemExtent: _carouselItem,
        itemBuilder: (context, index) => _carouselStep(index, steps[index]),
      ),
    );
  }

  Widget _carouselStep(int index, RoutineStep step) {
    final bool current = index == _run.phase.stepIndex;
    final bool done = step.completed;
    final Color tone = kindColor(_run.chain.kind);
    final double size = current ? 50 : 40;

    return GestureDetector(
      onTap: () => _onJumpTo(index),
      behavior: HitTestBehavior.opaque,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          AnimatedContainer(
            duration: const Duration(milliseconds: 250),
            curve: Curves.easeOutCubic,
            margin: EdgeInsets.only(top: current ? 0 : 6),
            width: size,
            height: size,
            alignment: Alignment.center,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              gradient: current
                  ? LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: <Color>[tone, kindDeep(_run.chain.kind)],
                    )
                  : null,
              color: current ? null : (done ? tone.withValues(alpha: 0.12) : colorWhite),
              border: Border.all(
                color: current
                    ? colorWhite
                    : done
                        ? tone.withValues(alpha: 0.3)
                        : colorBorder,
                width: current ? 3 : 1,
              ),
              boxShadow: current
                  ? [
                      BoxShadow(
                        color: tone.withValues(alpha: 0.25),
                        blurRadius: 12,
                        offset: const Offset(0, 4),
                      ),
                    ]
                  : null,
            ),
            child: done && !current
                ? Icon(Icons.check_rounded, size: 18, color: tone)
                : text("${index + 1}", current ? 15 : 12, TextType.Bold,
                    color: current ? colorWhite : colorGrey2),
          ),
          const SizedBox(height: 6),
          text(
            step.title,
            10,
            current ? TextType.Bold : TextType.Regular,
            color: current ? colorPrimaryDark : colorGrey2,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            align: TextAlign.center,
          ),
        ],
      ),
    );
  }

  Widget _setDots(RoutinePhase phase, Color tone) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        text("SET ${phase.set} / ${phase.step.sets}", 9, TextType.Bold,
            color: tone, letterSpacing: 1.0),
        const SizedBox(width: 10),
        ...List<Widget>.generate(phase.step.sets, (index) {
          final int set = index + 1;
          final bool filled =
              set < phase.set || (set == phase.set && phase.rest);
          final bool active = set == phase.set && !phase.rest;

          return AnimatedContainer(
            duration: const Duration(milliseconds: 200),
            width: active ? 18 : 7,
            height: 7,
            margin: const EdgeInsets.only(right: 4),
            decoration: BoxDecoration(
              color: filled || active ? tone : colorMuted,
              borderRadius: BorderRadius.circular(999),
            ),
          );
        }),
      ],
    );
  }

  Widget _clock(RoutinePhase phase, Color tone) {
    final String label;
    final String value;

    if (phase.countsDown) {
      label = phase.rest ? "REST REMAINING" : "REMAINING";
      value = formatClock(_run.phaseRemaining());
    } else if (phase.step.mode == StepMode.Reps) {
      label = "REPS · ${formatClock(_run.phaseElapsed())}";
      value = "× ${phase.step.reps}";
    } else {
      label = "ON THIS TASK";
      value = formatClock(_run.phaseElapsed());
    }

    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        text(label, 9, TextType.Bold,
            color: colorGrey2, letterSpacing: 1.6),
        const SizedBox(height: 4),
        text(value, 64, TextType.Light,
            color: _run.running ? colorPrimaryDark : colorGrey2, height: 1.0),
        if (phase.countsDown) ...[
          const SizedBox(height: 12),
          SizedBox(
            width: 180,
            child: meter(_run.phaseProgress(),
                fill: phase.rest ? colorGrey2 : tone, height: 4),
          ),
        ],
      ],
    );
  }

  /// The cue while working; what is coming while resting.
  Widget _caption(RoutinePhase phase) {
    final RoutinePhase? next = _run.nextWork;

    String line = "";
    if (phase.rest && next != null) {
      line = next.step.sets > 1
          ? "Up next: ${next.step.title} · set ${next.set} of ${next.step.sets}"
          : "Up next: ${next.step.title}";
    } else if (phase.step.cue.isNotEmpty) {
      line = phase.step.cue;
    } else if (next != null) {
      line = "Then: ${next.step.title}";
    }

    return text(line, 13, TextType.Regular,
        color: colorGrey2, align: TextAlign.center, maxLines: 2, height: 1.4);
  }

  Widget _transport(RoutinePhase phase, Color tone) {
    final bool countdown = phase.countsDown;

    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          _roundControl(
            _haptics
                ? CupertinoIcons.waveform
                : CupertinoIcons.waveform_path_badge_minus,
            _onToggleHaptics,
          ),
          _roundControl(CupertinoIcons.backward_end_fill, _onPrevious,
              enabled: _run.phaseIndex > 0),
          GestureDetector(
            onTap: _onPrimary,
            child: AnimatedContainer(
              duration: const Duration(milliseconds: 200),
              width: 118,
              height: 56,
              alignment: Alignment.center,
              decoration: BoxDecoration(
                color: colorPrimaryDark,
                borderRadius: BorderRadius.circular(999),
              ),
              child: countdown
                  ? Icon(
                      _run.running
                          ? CupertinoIcons.pause_fill
                          : CupertinoIcons.play_fill,
                      size: 22,
                      color: colorKindWorkoutBg,
                    )
                  : Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Icon(Icons.check_rounded,
                            size: 18, color: colorKindWorkoutBg),
                        const SizedBox(width: 6),
                        text(
                          phase.step.mode == StepMode.Reps
                              ? "Set done"
                              : "Done",
                          13,
                          TextType.Bold,
                          color: colorWhite,
                        ),
                      ],
                    ),
            ),
          ),
          _roundControl(CupertinoIcons.forward_end_fill, _onNext),
          _roundControl(CupertinoIcons.list_number, _onOpenSteps),
        ],
      ),
    );
  }

  Widget _roundControl(IconData icon, VoidCallback onTap,
      {bool enabled = true}) {
    return GestureDetector(
      onTap: enabled ? onTap : null,
      child: Container(
        width: 46,
        height: 46,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: colorWhite,
          shape: BoxShape.circle,
          border: Border.all(color: colorBorder),
        ),
        child: Icon(icon,
            size: 17, color: enabled ? colorPrimaryDark : colorGrey),
      ),
    );
  }

  /// Every step with its state. Tap one to jump there.
  Widget _stepsSheet(BuildContext sheetContext) {
    final Color tone = kindColor(_run.chain.kind);

    return Container(
      constraints: BoxConstraints(
        maxHeight: MediaQuery.of(sheetContext).size.height * 0.7,
      ),
      decoration: const BoxDecoration(
        color: colorSheetBackground,
        borderRadius: BorderRadius.only(
          topLeft: Radius.circular(28),
          topRight: Radius.circular(28),
        ),
      ),
      child: ListView(
        shrinkWrap: true,
        padding: const EdgeInsets.fromLTRB(24, 24, 24, 32),
        children: [
          text("THE CHAIN", 9, TextType.Bold,
              color: tone, letterSpacing: 1.2),
          const SizedBox(height: 8),
          text(_run.chain.title, 24, TextType.Light, color: colorPrimaryDark),
          const SizedBox(height: 18),
          ..._run.chain.steps.asMap().entries.map((entry) {
            final int index = entry.key;
            final RoutineStep step = entry.value;
            final bool current = index == _run.phase.stepIndex;

            return GestureDetector(
              onTap: () {
                Navigator.pop(sheetContext);
                _onJumpTo(index);
              },
              behavior: HitTestBehavior.opaque,
              child: Container(
                margin: const EdgeInsets.only(bottom: 8),
                padding: const EdgeInsets.fromLTRB(12, 12, 14, 12),
                decoration: BoxDecoration(
                  color: current ? kindBackground(_run.chain.kind) : colorWhite,
                  borderRadius: BorderRadius.circular(14),
                  border: Border.all(
                    color: current ? tone.withValues(alpha: 0.35) : colorBorder,
                  ),
                ),
                child: Row(
                  children: [
                    Container(
                      width: 28,
                      height: 28,
                      alignment: Alignment.center,
                      decoration: BoxDecoration(
                        color: step.completed ? tone : colorSecondary,
                        shape: BoxShape.circle,
                      ),
                      child: step.completed
                          ? Icon(Icons.check_rounded,
                              size: 16, color: colorWhite)
                          : text("${index + 1}", 11, TextType.Bold,
                              color: colorGrey2),
                    ),
                    const SizedBox(width: 12),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          text(step.title, 14, TextType.Medium,
                              color: colorPrimaryDark),
                          const SizedBox(height: 3),
                          text(stepSummary(step), 11, TextType.Regular,
                              color: colorGrey2),
                        ],
                      ),
                    ),
                    if (current)
                      pill("Now", tone, colorWhite, textSize: 9),
                  ],
                ),
              ),
            );
          }),
        ],
      ),
    );
  }

  /// End of run. Held or not, it is stated plainly and then logged.
  Widget _summaryView() {
    final RoutineKind kind = _run.chain.kind;
    final bool held = _run.chain.complete;
    final int done = _run.chain.completedSteps;
    final int total = _run.chain.steps.length;
    final bool broken =
        !held && _run.chain.partialCompletion < Thresholds.routinePartialFloor;
    final Color label = colorWhite.withValues(alpha: 0.5);

    return Container(
      decoration: BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topCenter,
          end: Alignment.bottomCenter,
          colors: <Color>[kindColor(kind), kindDeep(kind)],
        ),
      ),
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.fromLTRB(28, 20, 28, 24),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              text(
                held ? "CHAIN HELD" : (broken ? "CHAIN BROKEN" : "PARTIAL"),
                10,
                TextType.Bold,
                color: label,
                letterSpacing: 1.6,
              ),
              const SizedBox(height: 12),
              text(_run.chain.title, 36, TextType.Light,
                  color: colorWhite, height: 1.1),
              const SizedBox(height: 14),
              text(
                held
                    ? "Every step, in order. That is the whole point."
                    : "$done of $total steps. This goes in as partial — honest, not hidden.",
                14,
                TextType.Regular,
                color: colorWhite.withValues(alpha: 0.7),
                height: 1.5,
              ),
              const Spacer(),
              Center(
                child: ProgressRing(
                  fraction: _run.chain.partialCompletion,
                  size: 180,
                  stroke: 5,
                  fill: colorWhite,
                  track: colorWhite.withValues(alpha: 0.14),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      text("$done/$total", 40, TextType.Light,
                          color: colorWhite),
                      text("STEPS", 9, TextType.Bold,
                          color: label, letterSpacing: 1.4),
                    ],
                  ),
                ),
              ),
              const Spacer(),
              Row(
                children: [
                  Expanded(
                    child: labelled("Time", formatClock(_run.elapsedSeconds()),
                        valueSize: 22,
                        valueType: TextType.Light,
                        valueColor: colorWhite,
                        labelColor: label),
                  ),
                  Expanded(
                    child: labelled("Skipped", "${_run.skippedCount}",
                        valueSize: 22,
                        valueType: TextType.Light,
                        valueColor: colorWhite,
                        labelColor: label),
                  ),
                  Expanded(
                    child: labelled("Left app", "${_run.backgroundedCount}×",
                        valueSize: 22,
                        valueType: TextType.Light,
                        valueColor: _run.backgroundedCount > 0
                            ? colorWarning
                            : colorWhite,
                        labelColor: label),
                  ),
                ],
              ),
              const SizedBox(height: 28),
              roundedCornerButton(
                "Log it",
                _onLog,
                background: colorWhite,
                foreground: colorPrimaryDark,
                icon: CupertinoIcons.checkmark,
              ),
            ],
          ),
        ),
      ),
    );
  }

  // ── ConnectRoutineRunner ──────────────────────────────────────────────────

  @override
  void onLogged(bool held) {
    Navigator.pop(context, true);
  }

  @override
  void dispose() {
    _ticker?.cancel();
    _breath.dispose();
    _carousel.dispose();
    WidgetsBinding.instance.removeObserver(this);
    _model?.clearRun();
    super.dispose();
  }
}