import 'dart:math' as math;

import 'package:flutter/material.dart';
import '../about/internal/application/TextType.dart';

import '../utils/Colors.dart';
import 'text/Text.dart';

/// Job-statistics style card: a donut gauge with the total in the centre, plus
/// labelled progress bars underneath.
class StatsDonut extends StatelessWidget {
  final int success;
  final int failed;
  final int reverted;
  const StatsDonut({
    super.key,
    required this.success,
    required this.failed,
    required this.reverted,
  });

  int get _total => success + failed + reverted;

  @override
  Widget build(BuildContext context) {
    final jp = context.jp;
    final total = _total;
    double pct(int n) => total == 0 ? 0 : n / total;
    return Container(
      padding: const EdgeInsets.all(18),
      decoration: PeachTheme.panel(context),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              text(
                'Deploy statistics',
                16,
                TextType.Bold,
                color: jp.text,
                weight: FontWeight.w800,
              ),
              const Spacer(),
              Container(
                width: 30,
                height: 30,
                decoration: BoxDecoration(
                  color: jp.surface2,
                  borderRadius: BorderRadius.circular(9),
                ),
                child: Icon(Icons.open_in_full, size: 14, color: jp.textDim),
              ),
            ],
          ),
          const SizedBox(height: 14),
          Center(
            child: SizedBox(
              width: 176,
              height: 176,
              child: CustomPaint(
                painter: _DonutPainter(
                  track: jp.surface2,
                  segments: [
                    (pct(success), PeachTheme.seed),
                    (pct(failed), PeachTheme.danger),
                    (pct(reverted), PeachTheme.slate),
                  ],
                ),
                child: Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      text(
                        '$total',
                        38,
                        TextType.Bold,
                        color: jp.text,
                        height: 1,
                        weight: FontWeight.w800,
                      ),
                      const SizedBox(height: 2),
                      text(
                        'Total deploys',
                        12,
                        TextType.Regular,
                        color: jp.textFaint,
                        weight: FontWeight.w400,
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ),
          const SizedBox(height: 18),
          _bar(jp, 'Successful', success, pct(success), PeachTheme.seed),
          const SizedBox(height: 14),
          _bar(jp, 'Failed', failed, pct(failed), PeachTheme.danger),
          const SizedBox(height: 14),
          _bar(jp, 'Reverted', reverted, pct(reverted), PeachTheme.slate),
        ],
      ),
    );
  }

  Widget _bar(JpColors jp, String label, int n, double frac, Color color) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            text(
              label,
              13,
              TextType.Regular,
              color: jp.textDim,
              weight: FontWeight.w600,
            ),
            const Spacer(),
            text(
              '${(frac * 100).round()}%',
              13,
              TextType.Regular,
              color: jp.text,
              weight: FontWeight.w800,
            ),
          ],
        ),
        const SizedBox(height: 6),
        ClipRRect(
          borderRadius: BorderRadius.circular(6),
          child: Stack(
            children: [
              Container(height: 8, color: jp.surface2),
              FractionallySizedBox(
                widthFactor: frac.clamp(0.0, 1.0),
                child: Container(height: 8, color: color),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

class _DonutPainter extends CustomPainter {
  final List<(double, Color)> segments;
  final Color track;
  _DonutPainter({required this.segments, required this.track});

  @override
  void paint(Canvas canvas, Size size) {
    const stroke = 18.0;
    final rect =
        Offset(stroke / 2, stroke / 2) &
        Size(size.width - stroke, size.height - stroke);
    final trackPaint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = stroke
      ..color = track;
    canvas.drawArc(rect, 0, 2 * math.pi, false, trackPaint);

    const gap = 0.06;
    var start = -math.pi / 2;
    for (final (frac, color) in segments) {
      if (frac <= 0) continue;
      final full = frac * 2 * math.pi;
      final sweep = (full - gap).clamp(0.02, 2 * math.pi);
      final p = Paint()
        ..style = PaintingStyle.stroke
        ..strokeWidth = stroke
        ..strokeCap = StrokeCap.round
        ..color = color;
      canvas.drawArc(rect, start + gap / 2, sweep, false, p);
      start += full;
    }
  }

  @override
  bool shouldRepaint(_DonutPainter old) =>
      old.segments != segments || old.track != track;
}