import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { WeekModeRenderer } from '../src/renderers/week';
import type { RenderContext } from '../src/renderers/types';
import type { HeatmapData } from '../src/types';
import { createInitialState } from '../src/state';

const DEFAULT_CONFIG = { cellSize: 13, cellGap: 2, marginTop: 20, marginLeft: 30, marginBottom: 4 };

function makeCtx(container: HTMLElement, data: HeatmapData, overrides?: Partial<RenderContext>): RenderContext {
  return {
    container,
    data,
    state: createInitialState('monday'),
    config: DEFAULT_CONFIG,
    ...overrides,
  };
}

// Known dates:
// 2025-01-06 = Monday
// 2025-01-07 = Tuesday
// 2025-01-08 = Wednesday
// 2025-01-13 = Monday (second Monday entry)
function makeMockData(): HeatmapData {
  return {
    days: [
      { date: '2025-01-06', hours: 2.5, count: 3 },  // Monday
      { date: '2025-01-07', hours: 5.0, count: 5 },  // Tuesday
      { date: '2025-01-08', hours: 1.0, count: 1 },  // Wednesday
      { date: '2025-01-13', hours: 3.0, count: 2 },  // Monday (second)
    ],
    range: { begin: '2025-01-01', end: '2025-01-31' },
  };
}

describe('WeekModeRenderer', () => {
  let container: HTMLDivElement;
  let renderer: WeekModeRenderer;

  beforeEach(() => {
    container = document.createElement('div');
    document.body.appendChild(container);
    renderer = new WeekModeRenderer();
  });

  afterEach(() => {
    renderer.destroy();
    document.querySelectorAll('.heatmap-tooltip').forEach(el => el.remove());
    container.remove();
  });

  it('has mode "week"', () => {
    expect(renderer.mode).toBe('week');
  });

  it('renders an SVG with exactly 7 rect elements', () => {
    renderer.render(makeCtx(container, makeMockData()));
    const svg = container.querySelector('svg.heatmap-svg');
    expect(svg).not.toBeNull();
    const rects = container.querySelectorAll('rect');
    expect(rects.length).toBe(7);
  });

  it('aggregates same-weekday entries (two Mondays summed)', () => {
    renderer.render(makeCtx(container, makeMockData()));
    // Monday is index 0 for monday-start. It should have data (2.5+3.0=5.5h)
    const rects = container.querySelectorAll('rect');
    const mondayRect = rects[0]; // First rect = Monday
    expect(mondayRect.classList.contains('heatmap-empty')).toBe(false);
    expect(mondayRect.getAttribute('fill')).toBeTruthy();
  });

  it('marks weekdays with no data as heatmap-empty', () => {
    renderer.render(makeCtx(container, makeMockData()));
    // Data on Mon, Tue, Wed only. Thu, Fri, Sat, Sun should be empty = 4 empty
    const emptyRects = container.querySelectorAll('rect.heatmap-empty');
    expect(emptyRects.length).toBe(4);
  });

  it('data weekdays get a fill color (not empty)', () => {
    renderer.render(makeCtx(container, makeMockData()));
    const filledRects = container.querySelectorAll('rect:not(.heatmap-empty)');
    expect(filledRects.length).toBe(3); // Mon, Tue, Wed
    filledRects.forEach(rect => {
      expect(rect.getAttribute('fill')).toBeTruthy();
    });
  });

  it('renders all 7 weekday labels for monday start', () => {
    renderer.render(makeCtx(container, makeMockData()));
    const labels = container.querySelectorAll('text.heatmap-label');
    expect(labels.length).toBe(7);
    const texts = Array.from(labels).map(el => el.textContent);
    expect(texts[0]).toBe('Mon');
    expect(texts[6]).toBe('Sun');
  });

  it('renders labels in sunday-first order when weekStart is sunday', () => {
    const state = createInitialState('sunday');
    renderer.render(makeCtx(container, makeMockData(), { state }));
    const labels = container.querySelectorAll('text.heatmap-label');
    const texts = Array.from(labels).map(el => el.textContent);
    expect(texts[0]).toBe('Sun');
    expect(texts[1]).toBe('Mon');
    expect(texts[6]).toBe('Sat');
  });

  it('shows tooltip with full weekday name and hours on hover', () => {
    renderer.render(makeCtx(container, makeMockData()));
    // Hover over Monday rect (index 0)
    const rect = container.querySelectorAll('rect')[0];
    rect.dispatchEvent(new MouseEvent('mouseenter', { bubbles: true }));

    const tooltip = document.body.querySelector('.heatmap-tooltip') as HTMLDivElement;
    expect(tooltip).not.toBeNull();
    expect(tooltip.style.display).toBe('block');
    expect(tooltip.innerHTML).toContain('Monday');
    expect(tooltip.innerHTML).toContain('5.5h');
    expect(tooltip.innerHTML).toContain('5 entries');
  });

  it('shows count-first tooltip when metric is count', () => {
    const state = createInitialState('monday');
    state.metric = 'count';
    renderer.render(makeCtx(container, makeMockData(), { state }));
    const rect = container.querySelectorAll('rect')[0]; // Monday
    rect.dispatchEvent(new MouseEvent('mouseenter', { bubbles: true }));

    const tooltip = document.body.querySelector('.heatmap-tooltip') as HTMLDivElement;
    expect(tooltip.innerHTML).toContain('5 entries');
    expect(tooltip.innerHTML).toContain('5.5h');
    // Count should come before hours in the text
    const html = tooltip.innerHTML;
    expect(html.indexOf('5 entries')).toBeLessThan(html.indexOf('5.5h'));
  });

  it('shows "No tracked time" tooltip for empty weekday', () => {
    renderer.render(makeCtx(container, makeMockData()));
    // Thursday is index 3 (monday-start), has no data
    const rect = container.querySelectorAll('rect')[3];
    rect.dispatchEvent(new MouseEvent('mouseenter', { bubbles: true }));

    const tooltip = document.body.querySelector('.heatmap-tooltip') as HTMLDivElement;
    expect(tooltip.innerHTML).toContain('Thursday');
    expect(tooltip.innerHTML).toContain('No tracked time');
  });

  it('destroy() removes tooltip element', () => {
    renderer.render(makeCtx(container, makeMockData()));
    expect(document.body.querySelector('.heatmap-tooltip')).not.toBeNull();
    renderer.destroy();
    expect(document.body.querySelector('.heatmap-tooltip')).toBeNull();
  });

  it('handles empty data gracefully', () => {
    const data: HeatmapData = {
      days: [],
      range: { begin: '2025-01-01', end: '2025-01-31' },
    };
    renderer.render(makeCtx(container, data));
    const svg = container.querySelector('svg');
    expect(svg).toBeNull();
    expect(container.textContent).toContain('No tracking data available');
  });

  it('all rects have heatmap-week-cell class', () => {
    renderer.render(makeCtx(container, makeMockData()));
    const rects = container.querySelectorAll('rect.heatmap-week-cell');
    expect(rects.length).toBe(7);
  });

  it('rects have rounded corners', () => {
    renderer.render(makeCtx(container, makeMockData()));
    const rect = container.querySelector('rect');
    expect(rect?.getAttribute('rx')).toBe('2');
    expect(rect?.getAttribute('ry')).toBe('2');
  });
});