import { describe, expect, test } from 'bun:test';
import { paneAt, parseMouseEvent } from './mouse';

describe('parseMouseEvent', () => {
  test('parses raw SGR press event', () => {
    expect(parseMouseEvent('\x1b[<0;5;3M')).toEqual({
      button: 0,
      col: 4,
      row: 2,
      pressed: true,
    });
  });

  test('parses Ink-relayed form (no leading ESC+CSI)', () => {
    expect(parseMouseEvent('[<2;15;7M')).toEqual({
      button: 2,
      col: 14,
      row: 6,
      pressed: true,
    });
  });

  test('press vs release', () => {
    expect(parseMouseEvent('[<0;1;1M')?.pressed).toBe(true);
    expect(parseMouseEvent('[<0;1;1m')?.pressed).toBe(false);
  });

  test('returns null for non-mouse input', () => {
    expect(parseMouseEvent('q')).toBeNull();
    expect(parseMouseEvent('\x1b[A')).toBeNull(); // arrow key, not mouse
    expect(parseMouseEvent('')).toBeNull();
  });
});

const REGIONS = {
  bodyHeight: 30,
  leftColWidth: 40,
  summaryHeight: 6,
  categoriesHeight: 8,
  detailHeight: 15,
};

describe('paneAt', () => {
  test('top-left of left column → summary', () => {
    expect(paneAt(0, 0, REGIONS)).toEqual({ pane: 'summary', rowInPane: 0 });
  });

  test('mid-left below summary → categories with row offset', () => {
    expect(paneAt(10, 8, REGIONS)).toEqual({ pane: 'categories', rowInPane: 2 });
  });

  test('bottom of left column → findings with row offset', () => {
    expect(paneAt(20, 25, REGIONS)).toEqual({
      pane: 'findings',
      rowInPane: 25 - REGIONS.summaryHeight - REGIONS.categoriesHeight,
    });
  });

  test('right column top → detail', () => {
    expect(paneAt(50, 5, REGIONS)).toEqual({ pane: 'detail', rowInPane: 5 });
  });

  test('right column bottom → log with offset', () => {
    expect(paneAt(60, 20, REGIONS)).toEqual({
      pane: 'log',
      rowInPane: 20 - REGIONS.detailHeight,
    });
  });

  test('keybar row (out of body) → null', () => {
    expect(paneAt(10, 30, REGIONS)).toBeNull();
    expect(paneAt(10, 50, REGIONS)).toBeNull();
  });

  test('negative col returns null', () => {
    expect(paneAt(-1, 5, REGIONS)).toBeNull();
  });
});