import 'package:flutter_test/flutter_test.dart';
import 'package:rippr/src/hud/hud_metric.dart';
import 'package:rippr/src/hud/hud_widget_layout.dart';

/// UI-04: the JSON round-trip and clamp math are exercised directly with fixed inputs
/// -- no real gestures needed to test either, per the ticket's own Tests section.
void main() {
  group('JSON round trip', () {
    test('encodes and decodes exactly', () {
      const original = HudWidgetLayout(
        metric: HudMetric.speed,
        x: 0.1,
        y: 0.2,
        width: 0.3,
        height: 0.15,
        visible: true,
      );

      final decoded = HudWidgetLayout.fromJson(HudMetric.speed, original.toJson());

      expect(decoded.x, original.x);
      expect(decoded.y, original.y);
      expect(decoded.width, original.width);
      expect(decoded.height, original.height);
      expect(decoded.visible, original.visible);
    });

    test('a malformed entry falls back to the default rather than crashing', () {
      final decoded = HudWidgetLayout.fromJson(HudMetric.distance, {'x': 'not a number'});
      final default_ = HudWidgetLayout.defaultFor(HudMetric.distance);

      expect(decoded.x, default_.x);
      expect(decoded.width, default_.width);
    });

    test('a missing field falls back to the default rather than crashing', () {
      final decoded = HudWidgetLayout.fromJson(HudMetric.maxSpeed, {'x': 0.1, 'y': 0.1});
      final default_ = HudWidgetLayout.defaultFor(HudMetric.maxSpeed);

      expect(decoded.x, default_.x);
    });
  });

  group('defaultFor', () {
    test('every metric gets a distinct default position', () {
      final positions = HudMetric.values
          .map(HudWidgetLayout.defaultFor)
          .map((l) => '${l.x},${l.y}')
          .toSet();
      expect(positions.length, HudMetric.values.length,
          reason: 'no two metrics should default to overlapping positions');
    });

    test('the first four metrics (the mockup\'s fixed row) start visible', () {
      expect(HudWidgetLayout.defaultFor(HudMetric.speed).visible, isTrue);
      expect(HudWidgetLayout.defaultFor(HudMetric.distance).visible, isTrue);
      expect(HudWidgetLayout.defaultFor(HudMetric.elapsedTime).visible, isTrue);
      expect(HudWidgetLayout.defaultFor(HudMetric.maxSpeed).visible, isTrue);
    });

    test('metrics beyond the fixed row start hidden', () {
      expect(HudWidgetLayout.defaultFor(HudMetric.avgSpeed).visible, isFalse);
      expect(HudWidgetLayout.defaultFor(HudMetric.elevationGain).visible, isFalse);
    });

    test('every default is already within the valid clamp bounds', () {
      for (final metric in HudMetric.values) {
        final layout = HudWidgetLayout.defaultFor(metric);
        expect(layout.clamped().x, layout.x);
        expect(layout.clamped().y, layout.y);
        expect(layout.clamped().width, layout.width);
        expect(layout.clamped().height, layout.height);
      }
    });
  });

  group('clamped', () {
    const base = HudWidgetLayout(
      metric: HudMetric.speed,
      x: 0.5,
      y: 0.5,
      width: 0.3,
      height: 0.15,
      visible: true,
    );

    test('a position dragged past the right/bottom edge is pulled back on-screen', () {
      final result = base.copyWith(x: 1.5, y: 1.5).clamped();
      expect(result.x, 1.0 - base.width);
      expect(result.y, 1.0 - base.height);
    });

    test('a position dragged past the left/top edge is pulled back on-screen', () {
      final result = base.copyWith(x: -0.5, y: -0.5).clamped();
      expect(result.x, 0.0);
      expect(result.y, 0.0);
    });

    test('a resize below the legibility floor is corrected up to the minimum', () {
      final result = base.copyWith(width: 0.01, height: 0.01).clamped();
      expect(result.width, hudMinWidthFraction);
      expect(result.height, hudMinHeightFraction);
    });

    test('a resize above the sane ceiling is corrected down to the maximum', () {
      final result = base.copyWith(width: 5.0, height: 5.0).clamped();
      expect(result.width, hudMaxWidthFraction);
      expect(result.height, hudMaxHeightFraction);
    });

    test('shrinking to fit happens before repositioning, so a widget resized past '
        'the edge shrinks rather than silently relocates', () {
      final result = base.copyWith(x: 0.9, width: 0.7).clamped();
      expect(result.width, hudMaxWidthFraction);
      // x itself is still clamped against the (now-bounded) width so the widget
      // never sits partially off-screen either.
      expect(result.x + result.width, lessThanOrEqualTo(1.0));
    });

    test('an already-valid layout is unchanged', () {
      expect(base.clamped().x, base.x);
      expect(base.clamped().y, base.y);
      expect(base.clamped().width, base.width);
      expect(base.clamped().height, base.height);
    });
  });
}