import 'package:observer/detection/detection_result.dart';
import 'package:observer/detection/detector_worker.dart';
import 'package:flutter_test/flutter_test.dart';

DetectionResult box(String label, double score, double x, double y,
        {int modelId = -1, String modelName = ''}) =>
    DetectionResult(
      label: label,
      score: score,
      left: x,
      top: y,
      right: x + 0.1,
      bottom: y + 0.1,
      modelId: modelId,
      modelName: modelName,
      classId: 0,
    );

DetectionResult rect(String label, double score, double l, double t, double r,
        double b, {int modelId = -1}) =>
    DetectionResult(
      label: label,
      score: score,
      left: l,
      top: t,
      right: r,
      bottom: b,
      modelId: modelId,
      classId: 0,
    );

void main() {
  test('不同模型同标签重复框：NMS 去重取高分', () {
    // 两个模型都对同一目标检出同标签框（重复框需去重）
    final all = [
      box('target', 0.18, 0.3, 0.3, modelId: 1, modelName: '模型A'),
      box('target', 0.55, 0.31, 0.3, modelId: 2, modelName: '模型B'),
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 1);
    expect(merged.first.score, 0.55);
    expect(merged.first.modelName, '模型B');
  });

  test('不同类别重叠：去重取高分（实测多模型对同一目标检异类别）', () {
    final all = [
      box('target', 0.3, 0.5, 0.5, modelId: 1),
      box('second', 0.7, 0.5, 0.5, modelId: 2), // 同位置但不同类别
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 1);
    expect(merged.first.label, 'second');
    expect(merged.first.score, 0.7);
  });

  test('不同类别不重叠：都保留', () {
    final all = [
      box('target', 0.3, 0.1, 0.1, modelId: 1),
      box('second', 0.7, 0.8, 0.8, modelId: 2), // 远处互不重叠
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 2);
  });

  test('同模型内部与跨模型合并一致：远处不重叠保留', () {
    final all = [
      box('target', 0.2, 0.1, 0.1, modelId: 1, modelName: '模型A'),
      box('target', 0.3, 0.8, 0.8, modelId: 1, modelName: '模型A'),
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 2);
    expect(merged.first.score, 0.3); // 按分排序
  });

  test('单条结果原样返回', () {
    final single = [box('suspect', 0.11, 0.2, 0.2)];
    final merged = mergeAcrossModels(single, 0.45);
    expect(identical(merged, single), isTrue);
  });

  test('不同模型偏移框（小框中心在大框内）：0.45 阈值外的窗口也去重', () {
    // 覆盖 ≈ 0.31 < 0.45：纯阈值会漏；小框中心在大框内 → 同一目标取高分
    // （2026-09-03：不同输入分辨率模型对同一目标的框几何系统性偏移）
    final all = [
      rect('target', 0.5, 0.38, 0.445, 0.62, 0.535, modelId: 1),
      rect('second', 0.6, 0.2, 0.2, 0.5, 0.5, modelId: 2),
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 1);
    expect(merged.first.label, 'second');
    expect(merged.first.score, 0.6);
  });

  test('同模型偏移框：不套用跨模型窗口，正常保留', () {
    final all = [
      rect('target', 0.5, 0.38, 0.445, 0.62, 0.535, modelId: 1),
      rect('second', 0.6, 0.2, 0.2, 0.5, 0.5, modelId: 1),
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 2, reason: '同模型框对由模型内类内 NMS 负责');
  });

  test('无来源模型（modelId -1）：不套用跨模型窗口（存量语义不变）', () {
    final all = [
      rect('target', 0.5, 0.38, 0.445, 0.62, 0.535),
      rect('second', 0.6, 0.2, 0.2, 0.5, 0.5),
    ];
    final merged = mergeAcrossModels(all, 0.45);
    expect(merged.length, 2);
  });
}