/**
 * Performance Benchmark: SpatialIndex with 50,000 elements
 * Verifies that the R-Tree spatial index can handle large datasets efficiently.
 */
import { describe, it, expect, beforeAll } from 'vitest';
import { SpatialIndex } from '../src/canvas/SpatialIndex';
import type { CADElement } from '../src/types/cad.types';

const N = 50_000;

describe('Performance Benchmark: 50.000 Elemente', () => {
  let spatialIndex: SpatialIndex;
  let elements: CADElement[];

  beforeAll(() => {
    spatialIndex = new SpatialIndex();
    elements = [];

    // Generate 50k elements in a grid pattern
    for (let i = 0; i < N; i++) {
      const col = i % 200;
      const row = Math.floor(i / 200);
      elements.push({
        id: `perf-el-${i}`,
        type: 'rect',
        layerId: 'layer-perf',
        x: col * 10,
        y: row * 10,
        width: 8,
        height: 8,
        properties: { stroke: '#000', fill: '#ccc' },
      });
    }
  });

  it('should bulk-insert 50k elements in under 2s', () => {
    const start = performance.now();
    spatialIndex.bulkInsert(elements);
    const elapsed = performance.now() - start;
    console.log(`Bulk insert ${N} elements: ${elapsed.toFixed(1)}ms`);
    expect(elapsed).toBeLessThan(2000);
  });

  it('should search viewport with ~100 visible elements in under 10ms', () => {
    // Query a small viewport that contains ~100 elements
    const start = performance.now();
    const results = spatialIndex.search({ minX: 0, minY: 0, maxX: 1000, maxY: 100 });
    const elapsed = performance.now() - start;
    console.log(`Viewport search (~100 elements): ${elapsed.toFixed(2)}ms, found=${results.length}`);
    expect(results.length).toBeGreaterThan(50);
    expect(results.length).toBeLessThan(2000);
    expect(elapsed).toBeLessThan(10);
  });

  it('should search large viewport (all elements) in under 100ms', () => {
    const start = performance.now();
    const results = spatialIndex.search({ minX: 0, minY: 0, maxX: 20000, maxY: 2500 });
    const elapsed = performance.now() - start;
    console.log(`Full viewport search: ${elapsed.toFixed(2)}ms, found=${results.length}`);
    expect(results.length).toBe(N);
    expect(elapsed).toBeLessThan(100);
  });

  it('should handle 100 sequential viewport searches in under 500ms', () => {
    const start = performance.now();
    for (let i = 0; i < 100; i++) {
      const x = (i * 20) % 2000;
      const y = (i * 5) % 500;
      spatialIndex.search({ minX: x, minY: y, maxX: x + 200, maxY: y + 100 });
    }
    const elapsed = performance.now() - start;
    console.log(`100 sequential searches: ${elapsed.toFixed(2)}ms`);
    expect(elapsed).toBeLessThan(500);
  });

  it('should remove 1000 elements in under 200ms', () => {
    const start = performance.now();
    for (let i = 0; i < 1000; i++) {
      spatialIndex.remove(elements[i]);
    }
    const elapsed = performance.now() - start;
    console.log(`Remove 1000 elements: ${elapsed.toFixed(2)}ms`);
    expect(elapsed).toBeLessThan(200);

    // Verify count
    const results = spatialIndex.search({ minX: 0, minY: 0, maxX: 20000, maxY: 2500 });
    expect(results.length).toBe(N - 1000);
  });

  it('should clear all elements in under 50ms', () => {
    const start = performance.now();
    spatialIndex.clear();
    const elapsed = performance.now() - start;
    console.log(`Clear all: ${elapsed.toFixed(2)}ms`);
    expect(elapsed).toBeLessThan(50);
    expect(spatialIndex.search({ minX: 0, minY: 0, maxX: 20000, maxY: 2500 }).length).toBe(0);
  });
});