import { describe, expect, test } from "vitest";
import {
  ACTIVITY_PANEL_DEFAULT_WIDTH,
  ACTIVITY_PANEL_STORAGE_KEY,
  clampActivityPanelWidth,
  getActivityPanelBounds,
  loadActivityPanelWidth,
  resizeWidthFromKey,
  saveActivityPanelWidth,
} from "./useActivityPanelResize";

describe("activity panel resize contract", () => {
  test("lets the panel reach a 50/50 split while preserving 512px centrally when narrow", () => {
    expect(getActivityPanelBounds(2000)).toEqual({ min: 288, max: 1000 }); // exactly 50%
    expect(getActivityPanelBounds(1200)).toEqual({ min: 288, max: 600 }); // 50%, central 600 ≥ 512
    expect(getActivityPanelBounds(1024)).toEqual({ min: 288, max: 512 }); // 50% == central-min
    expect(getActivityPanelBounds(800)).toEqual({ min: 288, max: 288 }); // central-min binds before 50%
  });

  test("clamps finite values and falls back for invalid values", () => {
    const bounds = { min: 288, max: 576 };
    expect(clampActivityPanelWidth(200, bounds)).toBe(288);
    expect(clampActivityPanelWidth(420, bounds)).toBe(420);
    expect(clampActivityPanelWidth(900, bounds)).toBe(576);
    expect(clampActivityPanelWidth(Number.NaN, bounds)).toBe(ACTIVITY_PANEL_DEFAULT_WIDTH);
  });

  test("maps keyboard controls to exact clamped increments", () => {
    const bounds = { min: 288, max: 576 };
    expect(resizeWidthFromKey(384, "ArrowLeft", false, bounds)).toBe(368);
    expect(resizeWidthFromKey(384, "ArrowRight", true, bounds)).toBe(432);
    expect(resizeWidthFromKey(384, "Home", false, bounds)).toBe(288);
    expect(resizeWidthFromKey(384, "End", false, bounds)).toBe(576);
    expect(resizeWidthFromKey(384, "Enter", false, bounds)).toBeNull();
  });

  test("loads, persists, and rejects corrupt browser values", () => {
    localStorage.clear();
    expect(loadActivityPanelWidth(localStorage)).toBe(ACTIVITY_PANEL_DEFAULT_WIDTH);
    localStorage.setItem(ACTIVITY_PANEL_STORAGE_KEY, "corrupt");
    expect(loadActivityPanelWidth(localStorage)).toBe(ACTIVITY_PANEL_DEFAULT_WIDTH);
    saveActivityPanelWidth(448, localStorage);
    expect(loadActivityPanelWidth(localStorage)).toBe(448);
  });
});