import 'dart:async';

import 'package:flutter/material.dart';

import 'package:askiineverdie/data/game_text_l10n.dart' as l10n;
import 'package:askiineverdie/data/story_data.dart';

/// 시네마틱 뷰 위젯 (Phase 9: Cinematic UI)
///
/// Act 전환 시 풀스크린 시네마틱 표시
class CinematicView extends StatefulWidget {
  const CinematicView({
    super.key,
    required this.steps,
    required this.onComplete,
    this.canSkip = true,
  });

  final List<CinematicStep> steps;
  final VoidCallback onComplete;
  final bool canSkip;

  @override
  State<CinematicView> createState() => _CinematicViewState();
}

class _CinematicViewState extends State<CinematicView>
    with SingleTickerProviderStateMixin {
  int _currentStep = 0;
  Timer? _autoAdvanceTimer;

  late AnimationController _fadeController;
  late Animation<double> _fadeAnimation;

  @override
  void initState() {
    super.initState();

    _fadeController = AnimationController(
      duration: const Duration(milliseconds: 500),
      vsync: this,
    );

    _fadeAnimation = CurvedAnimation(
      parent: _fadeController,
      curve: Curves.easeInOut,
    );

    _fadeController.forward();
    _scheduleAutoAdvance();
  }

  void _scheduleAutoAdvance() {
    _autoAdvanceTimer?.cancel();
    if (_currentStep < widget.steps.length) {
      final step = widget.steps[_currentStep];
      _autoAdvanceTimer = Timer(
        Duration(milliseconds: step.durationMs),
        _advanceStep,
      );
    }
  }

  void _advanceStep() {
    if (_currentStep >= widget.steps.length - 1) {
      _complete();
      return;
    }

    _fadeController.reverse().then((_) {
      if (mounted) {
        setState(() {
          _currentStep++;
        });
        _fadeController.forward();
        _scheduleAutoAdvance();
      }
    });
  }

  void _complete() {
    _autoAdvanceTimer?.cancel();
    widget.onComplete();
  }

  void _skip() {
    if (widget.canSkip) {
      _complete();
    }
  }

  @override
  void dispose() {
    _autoAdvanceTimer?.cancel();
    _fadeController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (widget.steps.isEmpty) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        widget.onComplete();
      });
      return const SizedBox.shrink();
    }

    final step = widget.steps[_currentStep];

    return GestureDetector(
      onTap: _advanceStep,
      child: Material(
        color: Colors.black,
        child: SafeArea(
          child: Stack(
            children: [
              // 메인 콘텐츠
              Center(
                child: FadeTransition(
                  opacity: _fadeAnimation,
                  child: Padding(
                    padding: const EdgeInsets.all(24),
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        // ASCII 아트
                        if (step.asciiArt != null) ...[
                          _AsciiArtDisplay(asciiArt: step.asciiArt!),
                          const SizedBox(height: 24),
                        ],
                        // 텍스트
                        Text(
                          step.text,
                          style: const TextStyle(
                            color: Colors.white,
                            fontSize: 18,
                            fontFamily: 'JetBrainsMono',
                            height: 1.5,
                          ),
                          textAlign: TextAlign.center,
                        ),
                      ],
                    ),
                  ),
                ),
              ),

              // 진행 표시 (Progress Indicator)
              Positioned(
                bottom: 40,
                left: 0,
                right: 0,
                child: _ProgressDots(
                  total: widget.steps.length,
                  current: _currentStep,
                ),
              ),

              // 스킵 버튼
              if (widget.canSkip)
                Positioned(
                  top: 16,
                  right: 16,
                  child: TextButton(
                    onPressed: _skip,
                    child: Text(
                      l10n.uiSkip,
                      style: const TextStyle(
                        color: Colors.white54,
                        fontSize: 14,
                      ),
                    ),
                  ),
                ),

              // 탭 힌트
              Positioned(
                bottom: 16,
                left: 0,
                right: 0,
                child: Text(
                  l10n.uiTapToContinue,
                  style: TextStyle(
                    color: Colors.white.withValues(alpha: 0.3),
                    fontSize: 12,
                  ),
                  textAlign: TextAlign.center,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

/// ASCII 아트 표시 위젯
class _AsciiArtDisplay extends StatelessWidget {
  const _AsciiArtDisplay({required this.asciiArt});

  final String asciiArt;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        border: Border.all(color: Colors.cyan.withValues(alpha: 0.5)),
        borderRadius: BorderRadius.circular(8),
      ),
      child: Text(
        asciiArt,
        style: const TextStyle(
          color: Colors.cyan,
          fontSize: 14,
          fontFamily: 'JetBrainsMono',
          height: 1.2,
        ),
        textAlign: TextAlign.center,
      ),
    );
  }
}

/// 진행 도트 표시 위젯
class _ProgressDots extends StatelessWidget {
  const _ProgressDots({required this.total, required this.current});

  final int total;
  final int current;

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: List.generate(total, (index) {
        final isActive = index == current;
        final isPast = index < current;

        return Container(
          width: isActive ? 12 : 8,
          height: isActive ? 12 : 8,
          margin: const EdgeInsets.symmetric(horizontal: 4),
          decoration: BoxDecoration(
            shape: BoxShape.circle,
            color: isActive
                ? Colors.cyan
                : isPast
                ? Colors.cyan.withValues(alpha: 0.5)
                : Colors.white.withValues(alpha: 0.2),
          ),
        );
      }),
    );
  }
}

/// 시네마틱 표시 다이얼로그 함수 (Show Cinematic Dialog)
Future<void> showCinematic(
  BuildContext context, {
  required List<CinematicStep> steps,
  bool canSkip = true,
}) async {
  if (steps.isEmpty) return;

  return showDialog<void>(
    context: context,
    barrierDismissible: false,
    barrierColor: Colors.black,
    builder: (context) => CinematicView(
      steps: steps,
      canSkip: canSkip,
      onComplete: () => Navigator.of(context).pop(),
    ),
  );
}

/// Act 시네마틱 표시 함수 (Show Act Cinematic)
Future<void> showActCinematic(BuildContext context, StoryAct act) async {
  final steps = cinematicData[act];
  if (steps == null || steps.isEmpty) return;

  await showCinematic(context, steps: steps);
}