import { expect, type Locator, type Page, test } from "@playwright/test";

async function dragWithPointer(
	page: Page,
	source: Locator,
	target: Locator,
): Promise<void> {
	const sourceBox = await source.boundingBox();
	const targetBox = await target.boundingBox();

	if (!sourceBox || !targetBox) {
		throw new Error("Drag source or target is not visible");
	}

	const sourcePosition = {
		x: sourceBox.x + sourceBox.width / 2,
		y: sourceBox.y + sourceBox.height / 2,
	};
	const targetPosition = {
		x: targetBox.x + targetBox.width / 2,
		y: targetBox.y + targetBox.height / 2,
	};

	await page.mouse.move(sourcePosition.x, sourcePosition.y);
	await page.mouse.down();
	await page.mouse.move(sourcePosition.x + 10, sourcePosition.y, { steps: 5 });
	await page.waitForTimeout(150);
	await page.mouse.move(targetPosition.x, targetPosition.y, { steps: 20 });
	await page.waitForTimeout(150);
	await page.mouse.up();
}

function getResource(page: Page, title: string): Locator {
	return page.getByRole("button", { name: new RegExp(title) });
}

function getCategory(page: Page, title: string): Locator {
	return page.getByRole("heading", { name: title, exact: true }).locator("..");
}

test.describe("CourseDemo connected flow", () => {
	test.beforeEach(async ({ page }) => {
		await page.goto("/#/course-demo");
		await page.waitForLoadState("networkidle");
	});

	test("renders header and progress", async ({ page }) => {
		await expect(page.locator("text=学生资助政策 · 互动学习")).toBeVisible();
		await expect(page.locator("text=建立你的课程资源地图")).toBeVisible();
		await expect(page.locator('[data-guide="course-progress"]')).toBeVisible();
		await expect(page.locator("text=本节进度")).toBeVisible();
	});

	test("starts guide dialog and navigates steps", async ({ page }) => {
		await page.click("text=进入课程导入");
		await page.waitForTimeout(500);

		// First step should appear
		await expect(page.locator("text=欢迎进入学生资助政策微课")).toBeVisible();
		await expect(page.locator("text=1 / 4")).toBeVisible();

		// Click next
		await page.click("button:has-text('了解任务')");
		await page.waitForTimeout(300);
		await expect(page.locator("text=选择你的学习方式")).toBeVisible();
		await expect(page.locator("text=2 / 4")).toBeVisible();

		// Choose direct path
		await page.click("button:has-text('直接开始分类')");
		await page.waitForTimeout(300);
		await expect(page.locator("text=准备开始")).toBeVisible();
		await expect(page.locator("text=4 / 4")).toBeVisible();

		// Finish
		await page.click("button:has-text('开始挑战')");
		await page.waitForTimeout(300);

		// Dialog should close
		await expect(
			page.locator("text=欢迎进入学生资助政策微课"),
		).not.toBeVisible();
	});

	test("starts spotlight guide and highlights elements", async ({ page }) => {
		await page.click("text=查看操作引导");
		await page.waitForTimeout(500);

		// First spotlight step
		await expect(page.locator("text=先阅读资源卡片")).toBeVisible();
		await page.waitForTimeout(300);

		// Next step
		await page.click("button:has-text('下一步')");
		await page.waitForTimeout(500);
		await expect(page.locator("text=放入对应学习阶段")).toBeVisible();

		// Next step
		await page.click("button:has-text('下一步')");
		await page.waitForTimeout(500);
		await expect(page.locator("text=自动记录学习进度")).toBeVisible();

		// Finish
		await page.click("button:has-text('开始分类')");
		await page.waitForTimeout(300);
		await expect(page.locator("text=先阅读资源卡片")).not.toBeVisible();
	});

	test("drag and drop resource classification", async ({ page }) => {
		const policyResource = getResource(page, "资助政策微课");
		const policyZone = getCategory(page, "政策学习");

		await expect(policyResource).toBeVisible();
		await expect(policyZone).toBeVisible();
		await dragWithPointer(page, policyResource, policyZone);

		await expect(page.getByText("分类正确：资助政策微课")).toBeVisible();
		await expect(page.getByText("已完成 1/6")).toBeVisible();
		await expect(policyResource).not.toBeVisible();
	});

	test("wrong category shows error toast", async ({ page }) => {
		const policyResource = getResource(page, "资助政策微课");
		const wrongZone = getCategory(page, "互动实践");

		await expect(policyResource).toBeVisible();
		await expect(wrongZone).toBeVisible();
		await dragWithPointer(page, policyResource, wrongZone);

		await expect(
			page.getByText("“资助政策微课”不属于这个分类，再想一想。"),
		).toBeVisible();
		await expect(page.getByText("已完成 0/6")).toBeVisible();
		await expect(policyResource).toBeVisible();
	});

	test("completion overlay appears after all resources placed", async ({
		page,
	}) => {
		const placements = [
			["资助政策微课", "政策学习"],
			["申请流程图", "政策学习"],
			["诚信申请案例", "互动实践"],
			["材料自查清单", "互动实践"],
			["常见问题答疑", "学习支持"],
			["校园咨询渠道", "学习支持"],
		] as const;

		for (const [resourceTitle, categoryTitle] of placements) {
			await dragWithPointer(
				page,
				getResource(page, resourceTitle),
				getCategory(page, categoryTitle),
			);
		}

		await expect(page.getByText("资源地图已建立")).toBeVisible();
		await expect(page.getByText("已完成 6/6")).toBeVisible();
		await expect(page.getByText("100%")).toBeVisible();
	});

	test("persists progress with session fallback", async ({ page }) => {
		await dragWithPointer(
			page,
			getResource(page, "资助政策微课"),
			getCategory(page, "政策学习"),
		);
		await expect(page.getByText("已完成 1/6")).toBeVisible();

		await page.reload();
		await expect(page.getByText("进度已恢复")).toBeVisible();
		await expect(page.getByText("已完成 1/6")).toBeVisible();
		await expect(getResource(page, "资助政策微课")).not.toBeVisible();
	});
});