import { describe, expect, it } from "bun:test";

import { clampPane, keyboardPaneDelta, resizeDelta, restorePaneWidth } from "./resizable-pane";

describe("bounded pane resizing", () => {
	it("keeps a pane width within its inclusive bounds", () => {
		expect(clampPane(249, 250, 400)).toBe(250);
		expect(clampPane(304, 304, 400)).toBe(304);
		expect(clampPane(401, 250, 400)).toBe(400);
	});

	it("moves each pane edge in its screen direction", () => {
		expect(resizeDelta("left", 16)).toBe(16);
		expect(resizeDelta("right", 16)).toBe(-16);
	});

	it("restores a valid saved width and rejects invalid persisted values", () => {
		let bounds = { initial: 304, min: 304, max: 400 };

		expect(restorePaneWidth("360", bounds)).toBe(360);
		expect(restorePaneWidth("800", bounds)).toBe(400);
		expect(restorePaneWidth("bad", bounds)).toBe(304);
		expect(restorePaneWidth(null, bounds)).toBe(304);
	});

	it("maps keyboard commands to bounded pane movements", () => {
		let bounds = { min: 304, max: 400 };

		expect(keyboardPaneDelta("left", "ArrowRight", false, 320, bounds)).toBe(16);
		expect(keyboardPaneDelta("right", "ArrowRight", true, 384, bounds)).toBe(-64);
		expect(keyboardPaneDelta("left", "Home", false, 360, bounds)).toBe(-56);
		expect(keyboardPaneDelta("right", "End", false, 360, bounds)).toBe(40);
		expect(keyboardPaneDelta("left", "Tab", false, 360, bounds)).toBeUndefined();
	});
});