import 'dart:math' as math;
import 'package:flutter/material.dart';
import 'package:tatlock_ui/features/front_hall/data/models/environment_model.dart';

/// Sun position widget displaying sunrise/sunset with animated arc.
///
/// Shows a semicircle arc representing the day, with sun/moon icon
/// moving along based on current time. Uses color gradients:
/// - Blue tones for night
/// - Orange tones for sunrise/sunset
/// - Yellow tones for daytime
class SunPositionWidget extends StatelessWidget {
  const SunPositionWidget({
    super.key,
    this.sunTimes,
    this.compact = false,
  });

  /// Sun times data to display.
  final SunTimesData? sunTimes;

  /// Whether to use compact layout.
  final bool compact;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    if (compact) {
      return _buildCompact(context, colorScheme);
    }

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: [
            // Header
            Row(
              children: [
                Icon(
                  _isDaytime ? Icons.wb_sunny : Icons.nightlight_round,
                  size: 20,
                  color: colorScheme.onSurfaceVariant,
                ),
                const SizedBox(width: 8),
                Text(
                  'Sun Position',
                  style: Theme.of(context).textTheme.titleSmall?.copyWith(
                        color: colorScheme.onSurfaceVariant,
                      ),
                ),
              ],
            ),
            const SizedBox(height: 16),

            // Arc visualization
            SizedBox(
              height: 120,
              child: CustomPaint(
                size: const Size(double.infinity, 120),
                painter: _SunArcPainter(
                  sunTimes: sunTimes,
                  isDark: colorScheme.brightness == Brightness.dark,
                ),
              ),
            ),

            const SizedBox(height: 12),

            // Sunrise/Sunset times
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                _TimeDisplay(
                  icon: Icons.wb_twilight,
                  label: 'Sunrise',
                  time: sunTimes?.sunrise,
                  iconColor: Colors.orange,
                ),
                if (sunTimes?.daylightMinutes != null)
                  _DaylightDisplay(minutes: sunTimes!.daylightMinutes!),
                _TimeDisplay(
                  icon: Icons.nights_stay,
                  label: 'Sunset',
                  time: sunTimes?.sunset,
                  iconColor: Colors.deepOrange,
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildCompact(BuildContext context, ColorScheme colorScheme) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              _isDaytime ? Icons.wb_sunny : Icons.nightlight_round,
              size: 24,
              color: _isDaytime ? Colors.amber : Colors.indigo,
            ),
            const SizedBox(width: 8),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  _formatTime(sunTimes?.sunrise),
                  style: Theme.of(context).textTheme.labelSmall,
                ),
                Text(
                  _formatTime(sunTimes?.sunset),
                  style: Theme.of(context).textTheme.labelSmall,
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  bool get _isDaytime {
    if (sunTimes?.sunrise == null || sunTimes?.sunset == null) return true;
    final now = DateTime.now();
    return now.isAfter(sunTimes!.sunrise!) && now.isBefore(sunTimes!.sunset!);
  }

  String _formatTime(DateTime? time) {
    if (time == null) return '--:--';
    return '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}';
  }
}

class _TimeDisplay extends StatelessWidget {
  const _TimeDisplay({
    required this.icon,
    required this.label,
    required this.time,
    this.iconColor,
  });

  final IconData icon;
  final String label;
  final DateTime? time;
  final Color? iconColor;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    return Column(
      children: [
        Icon(
          icon,
          size: 20,
          color: iconColor ?? colorScheme.primary,
        ),
        const SizedBox(height: 4),
        Text(
          _formatTime(time),
          style: Theme.of(context).textTheme.titleSmall?.copyWith(
                fontWeight: FontWeight.w600,
              ),
        ),
        Text(
          label,
          style: Theme.of(context).textTheme.labelSmall?.copyWith(
                color: colorScheme.onSurfaceVariant,
              ),
        ),
      ],
    );
  }

  String _formatTime(DateTime? time) {
    if (time == null) return '--:--';
    return '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}';
  }
}

class _DaylightDisplay extends StatelessWidget {
  const _DaylightDisplay({required this.minutes});

  final int minutes;

  @override
  Widget build(BuildContext context) {
    final hours = minutes ~/ 60;
    final mins = minutes % 60;

    return Column(
      children: [
        Icon(
          Icons.access_time,
          size: 16,
          color: Theme.of(context).colorScheme.outline,
        ),
        const SizedBox(height: 4),
        Text(
          '${hours}h ${mins}m',
          style: Theme.of(context).textTheme.bodySmall?.copyWith(
                fontWeight: FontWeight.w500,
              ),
        ),
        Text(
          'Daylight',
          style: Theme.of(context).textTheme.labelSmall?.copyWith(
                color: Theme.of(context).colorScheme.onSurfaceVariant,
              ),
        ),
      ],
    );
  }
}

/// Custom painter for the sun arc visualization.
class _SunArcPainter extends CustomPainter {
  _SunArcPainter({
    this.sunTimes,
    this.isDark = false,
  });

  final SunTimesData? sunTimes;
  final bool isDark;

  // Color palette
  static const _nightBlue = Color(0xFF1a237e);
  static const _dawnOrange = Color(0xFFff6f00);
  static const _sunriseOrange = Color(0xFFffa000);
  static const _dayYellow = Color(0xFFffc107);
  static const _dayGold = Color(0xFFffb300);
  static const _duskOrange = Color(0xFFef6c00);
  static const _nightIndigo = Color(0xFF283593);

  @override
  void paint(Canvas canvas, Size size) {
    final center = Offset(size.width / 2, size.height - 10);
    final radius = math.min(size.width / 2 - 20, size.height - 30);

    // Draw horizon line
    final horizonPaint = Paint()
      ..color = isDark ? Colors.white24 : Colors.black12
      ..strokeWidth = 1;
    canvas.drawLine(
      Offset(center.dx - radius - 10, center.dy),
      Offset(center.dx + radius + 10, center.dy),
      horizonPaint,
    );

    // Create gradient for arc background
    final arcRect = Rect.fromCenter(
      center: center,
      width: radius * 2,
      height: radius * 2,
    );

    // Draw arc background (night portion below horizon implied)
    final arcBgPaint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 8
      ..strokeCap = StrokeCap.round;

    // Create gradient that transitions through time of day colors
    arcBgPaint.shader = SweepGradient(
      center: Alignment.bottomCenter,
      startAngle: math.pi,
      endAngle: 2 * math.pi,
      colors: [
        _nightBlue.withValues(alpha: 0.3),
        _dawnOrange.withValues(alpha: 0.5),
        _sunriseOrange.withValues(alpha: 0.6),
        _dayYellow.withValues(alpha: 0.7),
        _dayGold.withValues(alpha: 0.7),
        _dayYellow.withValues(alpha: 0.6),
        _duskOrange.withValues(alpha: 0.5),
        _nightIndigo.withValues(alpha: 0.3),
      ],
      stops: const [0.0, 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0],
      transform: const GradientRotation(-math.pi / 2),
    ).createShader(arcRect);

    // Draw the arc (semicircle from left to right)
    canvas.drawArc(
      arcRect,
      math.pi, // Start at left (180 degrees)
      math.pi, // Sweep 180 degrees (semicircle)
      false,
      arcBgPaint,
    );

    // Calculate sun position
    final sunPosition = _calculateSunPosition();

    // Draw sun/moon indicator
    final angle = math.pi + (sunPosition * math.pi); // Map 0-1 to pi-2pi
    final sunX = center.dx + radius * math.cos(angle);
    final sunY = center.dy + radius * math.sin(angle);

    // Determine if day or night for icon/color
    final isDaytime = sunPosition > 0 && sunPosition < 1;
    final isNearHorizon = sunPosition < 0.15 || sunPosition > 0.85;

    // Sun/moon glow
    if (isDaytime) {
      final glowColor = isNearHorizon ? _dawnOrange : _dayYellow;
      final glowPaint = Paint()
        ..shader = RadialGradient(
          colors: [
            glowColor.withValues(alpha: 0.6),
            glowColor.withValues(alpha: 0.0),
          ],
        ).createShader(
          Rect.fromCircle(center: Offset(sunX, sunY), radius: 24),
        );
      canvas.drawCircle(Offset(sunX, sunY), 24, glowPaint);
    }

    // Sun/moon circle
    final sunPaint = Paint()
      ..style = PaintingStyle.fill
      ..color = isDaytime
          ? (isNearHorizon ? _sunriseOrange : _dayYellow)
          : _nightIndigo;

    canvas.drawCircle(Offset(sunX, sunY), 12, sunPaint);

    // Sun rays or moon craters
    if (isDaytime) {
      final rayPaint = Paint()
        ..style = PaintingStyle.stroke
        ..strokeWidth = 2
        ..color = (isNearHorizon ? _dawnOrange : _dayGold).withValues(alpha: 0.8);

      for (var i = 0; i < 8; i++) {
        final rayAngle = (i * math.pi / 4);
        final innerRadius = 14.0;
        final outerRadius = 18.0;
        canvas.drawLine(
          Offset(
            sunX + innerRadius * math.cos(rayAngle),
            sunY + innerRadius * math.sin(rayAngle),
          ),
          Offset(
            sunX + outerRadius * math.cos(rayAngle),
            sunY + outerRadius * math.sin(rayAngle),
          ),
          rayPaint,
        );
      }
    } else {
      // Moon highlight
      final moonHighlight = Paint()
        ..style = PaintingStyle.fill
        ..color = Colors.white24;
      canvas.drawCircle(Offset(sunX - 3, sunY - 3), 4, moonHighlight);
    }

    // Draw time markers on arc
    _drawTimeMarkers(canvas, center, radius);
  }

  double _calculateSunPosition() {
    if (sunTimes?.sunrise == null || sunTimes?.sunset == null) {
      // Default to noon position
      return 0.5;
    }

    final now = DateTime.now();
    final sunrise = sunTimes!.sunrise!;
    final sunset = sunTimes!.sunset!;

    // Before sunrise
    if (now.isBefore(sunrise)) {
      // Calculate position in pre-dawn (negative values = below horizon)
      final midnight = DateTime(now.year, now.month, now.day);
      final minutesSinceMidnight = now.difference(midnight).inMinutes;
      final minutesToSunrise = sunrise.difference(midnight).inMinutes;
      // Map to 0 at sunrise, negative before
      return (minutesSinceMidnight / minutesToSunrise) * 0.15 - 0.1;
    }

    // After sunset
    if (now.isAfter(sunset)) {
      // Calculate position in post-dusk
      final minutesSinceSunset = now.difference(sunset).inMinutes;
      final nextMidnight = DateTime(now.year, now.month, now.day + 1);
      final minutesToMidnight = nextMidnight.difference(sunset).inMinutes;
      // Map to 1 at sunset, going towards negative
      return 1.0 + (minutesSinceSunset / minutesToMidnight) * 0.1;
    }

    // During daylight hours
    final totalDaylight = sunset.difference(sunrise).inMinutes;
    final minutesSinceSunrise = now.difference(sunrise).inMinutes;
    return minutesSinceSunrise / totalDaylight;
  }

  void _drawTimeMarkers(Canvas canvas, Offset center, double radius) {
    final textPainter = TextPainter(
      textDirection: TextDirection.ltr,
      textAlign: TextAlign.center,
    );

    final markerStyle = TextStyle(
      fontSize: 10,
      color: isDark ? Colors.white38 : Colors.black38,
    );

    // Draw quarter markers (6am, 12pm, 6pm positions conceptually)
    final markers = ['6:00', '12:00', '18:00'];
    final positions = [0.25, 0.5, 0.75];

    for (var i = 0; i < markers.length; i++) {
      final angle = math.pi + (positions[i] * math.pi);
      final markerRadius = radius + 15;
      final x = center.dx + markerRadius * math.cos(angle);
      final y = center.dy + markerRadius * math.sin(angle);

      textPainter.text = TextSpan(text: markers[i], style: markerStyle);
      textPainter.layout();
      textPainter.paint(
        canvas,
        Offset(x - textPainter.width / 2, y - textPainter.height / 2),
      );
    }
  }

  @override
  bool shouldRepaint(covariant _SunArcPainter oldDelegate) {
    return oldDelegate.sunTimes != sunTimes || oldDelegate.isDark != isDark;
  }
}