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

test.beforeEach(async ({ page }) => {
	await page.goto('https://demo.playwright.dev/todomvc');
});

const TODO_ITEMS = ['buy some cheese', 'feed the cat', 'book a doctors appointment'];

test.describe('New Todo', () => {
	test('should allow me to add todo items', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		// Create 1st todo.
		await newTodo.fill(TODO_ITEMS[0]);
		await newTodo.press('Enter');

		// Make sure the list only has one todo item.
		await expect(page.getByTestId('todo-title')).toHaveText([TODO_ITEMS[0]]);

		// Create 2nd todo.
		await newTodo.fill(TODO_ITEMS[1]);
		await newTodo.press('Enter');

		// Make sure the list now has two todo items.
		await expect(page.getByTestId('todo-title')).toHaveText([TODO_ITEMS[0], TODO_ITEMS[1]]);

		await checkNumberOfTodosInLocalStorage(page, 2);
	});

	test('should clear text input field when an item is added', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		// Create one todo item.
		await newTodo.fill(TODO_ITEMS[0]);
		await newTodo.press('Enter');

		// Check that input is empty.
		await expect(newTodo).toBeEmpty();
		await checkNumberOfTodosInLocalStorage(page, 1);
	});

	test('should append new items to the bottom of the list', async ({ page }) => {
		// Create 3 items.
		await createDefaultTodos(page);

		// create a todo count locator
		const todoCount = page.getByTestId('todo-count');

		// Check test using different methods.
		await expect(page.getByText('3 items left')).toBeVisible();
		await expect(todoCount).toHaveText('3 items left');
		await expect(todoCount).toContainText('3');
		await expect(todoCount).toHaveText(/3/);

		// Check all items in one call.
		await expect(page.getByTestId('todo-title')).toHaveText(TODO_ITEMS);
		await checkNumberOfTodosInLocalStorage(page, 3);
	});
});

test.describe('Mark all as completed', () => {
	test.beforeEach(async ({ page }) => {
		await createDefaultTodos(page);
		await checkNumberOfTodosInLocalStorage(page, 3);
	});

	test.afterEach(async ({ page }) => {
		await checkNumberOfTodosInLocalStorage(page, 3);
	});

	test('should allow me to mark all items as completed', async ({ page }) => {
		// Complete all todos.
		await page.getByLabel('Mark all as complete').check();

		// Ensure all todos have 'completed' class.
		await expect(page.getByTestId('todo-item')).toHaveClass(['completed', 'completed', 'completed']);
		await checkNumberOfCompletedTodosInLocalStorage(page, 3);
	});

	test('should allow me to clear the complete state of all items', async ({ page }) => {
		const toggleAll = page.getByLabel('Mark all as complete');
		// Check and then immediately uncheck.
		await toggleAll.check();
		await toggleAll.uncheck();

		// Should be no completed classes.
		await expect(page.getByTestId('todo-item')).toHaveClass(['', '', '']);
	});

	test('complete all checkbox should update state when items are completed / cleared', async ({ page }) => {
		const toggleAll = page.getByLabel('Mark all as complete');
		await toggleAll.check();
		await expect(toggleAll).toBeChecked();
		await checkNumberOfCompletedTodosInLocalStorage(page, 3);

		// Uncheck first todo.
		const firstTodo = page.getByTestId('todo-item').nth(0);
		await firstTodo.getByRole('checkbox').uncheck();

		// Reuse toggleAll locator and make sure its not checked.
		await expect(toggleAll).not.toBeChecked();

		await firstTodo.getByRole('checkbox').check();
		await checkNumberOfCompletedTodosInLocalStorage(page, 3);

		// Assert the toggle all is checked again.
		await expect(toggleAll).toBeChecked();
	});
});

test.describe('Item', () => {
	test('should allow me to mark items as complete', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		// Create two items.
		for (const item of TODO_ITEMS.slice(0, 2)) {
			await newTodo.fill(item);
			await newTodo.press('Enter');
		}

		// Check first item.
		const firstTodo = page.getByTestId('todo-item').nth(0);
		await firstTodo.getByRole('checkbox').check();
		await expect(firstTodo).toHaveClass('completed');

		// Check second item.
		const secondTodo = page.getByTestId('todo-item').nth(1);
		await expect(secondTodo).not.toHaveClass('completed');
		await secondTodo.getByRole('checkbox').check();

		// Assert completed class.
		await expect(firstTodo).toHaveClass('completed');
		await expect(secondTodo).toHaveClass('completed');
	});

	test('should allow me to un-mark items as complete', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		// Create two items.
		for (const item of TODO_ITEMS.slice(0, 2)) {
			await newTodo.fill(item);
			await newTodo.press('Enter');
		}

		const firstTodo = page.getByTestId('todo-item').nth(0);
		const secondTodo = page.getByTestId('todo-item').nth(1);
		const firstTodoCheckbox = firstTodo.getByRole('checkbox');

		await firstTodoCheckbox.check();
		await expect(firstTodo).toHaveClass('completed');
		await expect(secondTodo).not.toHaveClass('completed');
		await checkNumberOfCompletedTodosInLocalStorage(page, 1);

		await firstTodoCheckbox.uncheck();
		await expect(firstTodo).not.toHaveClass('completed');
		await expect(secondTodo).not.toHaveClass('completed');
		await checkNumberOfCompletedTodosInLocalStorage(page, 0);
	});

	test('should allow me to edit an item', async ({ page }) => {
		await createDefaultTodos(page);

		const todoItems = page.getByTestId('todo-item');
		const secondTodo = todoItems.nth(1);
		await secondTodo.dblclick();
		await expect(secondTodo.getByRole('textbox', { name: 'Edit' })).toHaveValue(TODO_ITEMS[1]);
		await secondTodo.getByRole('textbox', { name: 'Edit' }).fill('buy some sausages');
		await secondTodo.getByRole('textbox', { name: 'Edit' }).press('Enter');

		// Explicitly assert the new text value.
		await expect(todoItems).toHaveText([TODO_ITEMS[0], 'buy some sausages', TODO_ITEMS[2]]);
		await checkTodosInLocalStorage(page, 'buy some sausages');
	});
});

test.describe('Editing', () => {
	test.beforeEach(async ({ page }) => {
		await createDefaultTodos(page);
		await checkNumberOfTodosInLocalStorage(page, 3);
	});

	test('should hide other controls when editing', async ({ page }) => {
		const todoItem = page.getByTestId('todo-item').nth(1);
		await todoItem.dblclick();
		await expect(todoItem.getByRole('checkbox')).not.toBeVisible();
		await expect(
			todoItem.locator('label', {
				hasText: TODO_ITEMS[1],
			})
		).not.toBeVisible();
		await checkNumberOfTodosInLocalStorage(page, 3);
	});

	test('should save edits on blur', async ({ page }) => {
		const todoItems = page.getByTestId('todo-item');
		await todoItems.nth(1).dblclick();
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).fill('buy some sausages');
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).dispatchEvent('blur');

		await expect(todoItems).toHaveText([TODO_ITEMS[0], 'buy some sausages', TODO_ITEMS[2]]);
		await checkTodosInLocalStorage(page, 'buy some sausages');
	});

	test('should trim entered text', async ({ page }) => {
		const todoItems = page.getByTestId('todo-item');
		await todoItems.nth(1).dblclick();
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).fill('    buy some sausages    ');
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).press('Enter');

		await expect(todoItems).toHaveText([TODO_ITEMS[0], 'buy some sausages', TODO_ITEMS[2]]);
		await checkTodosInLocalStorage(page, 'buy some sausages');
	});

	test('should remove the item if an empty text string was entered', async ({ page }) => {
		const todoItems = page.getByTestId('todo-item');
		await todoItems.nth(1).dblclick();
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).fill('');
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).press('Enter');

		await expect(todoItems).toHaveText([TODO_ITEMS[0], TODO_ITEMS[2]]);
	});

	test('should cancel edits on escape', async ({ page }) => {
		const todoItems = page.getByTestId('todo-item');
		await todoItems.nth(1).dblclick();
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).fill('buy some sausages');
		await todoItems.nth(1).getByRole('textbox', { name: 'Edit' }).press('Escape');
		await expect(todoItems).toHaveText(TODO_ITEMS);
	});
});

test.describe('Counter', () => {
	test('should display the current number of todo items', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		// create a todo count locator
		const todoCount = page.getByTestId('todo-count');

		await newTodo.fill(TODO_ITEMS[0]);
		await newTodo.press('Enter');

		await expect(todoCount).toContainText('1');

		await newTodo.fill(TODO_ITEMS[1]);
		await newTodo.press('Enter');
		await expect(todoCount).toContainText('2');

		await checkNumberOfTodosInLocalStorage(page, 2);
	});
});

test.describe('Clear completed button', () => {
	test.beforeEach(async ({ page }) => {
		await createDefaultTodos(page);
	});

	test('should display the correct text', async ({ page }) => {
		await page.locator('.todo-list li .toggle').first().check();
		await expect(page.getByRole('button', { name: 'Clear completed' })).toBeVisible();
	});

	test('should remove completed items when clicked', async ({ page }) => {
		const todoItems = page.getByTestId('todo-item');
		await todoItems.nth(1).getByRole('checkbox').check();
		await page.getByRole('button', { name: 'Clear completed' }).click();
		await expect(todoItems).toHaveCount(2);
		await expect(todoItems).toHaveText([TODO_ITEMS[0], TODO_ITEMS[2]]);
	});

	test('should be hidden when there are no items that are completed', async ({ page }) => {
		await page.locator('.todo-list li .toggle').first().check();
		await page.getByRole('button', { name: 'Clear completed' }).click();
		await expect(page.getByRole('button', { name: 'Clear completed' })).toBeHidden();
	});
});

test.describe('Persistence', () => {
	test('should persist its data', async ({ page }) => {
		// create a new todo locator
		const newTodo = page.getByPlaceholder('What needs to be done?');

		for (const item of TODO_ITEMS.slice(0, 2)) {
			await newTodo.fill(item);
			await newTodo.press('Enter');
		}

		const todoItems = page.getByTestId('todo-item');
		const firstTodoCheck = todoItems.nth(0).getByRole('checkbox');
		await firstTodoCheck.check();
		await expect(todoItems).toHaveText([TODO_ITEMS[0], TODO_ITEMS[1]]);
		await expect(firstTodoCheck).toBeChecked();
		await expect(todoItems).toHaveClass(['completed', '']);

		// Ensure there is 1 completed item.
		await checkNumberOfCompletedTodosInLocalStorage(page, 1);

		// Now reload.
		await page.reload();
		await expect(todoItems).toHaveText([TODO_ITEMS[0], TODO_ITEMS[1]]);
		await expect(firstTodoCheck).toBeChecked();
		await expect(todoItems).toHaveClass(['completed', '']);
	});
});

test.describe('Routing', () => {
	test.beforeEach(async ({ page }) => {
		await createDefaultTodos(page);
		// make sure the app had a chance to save updated todos in storage
		// before navigating to a new view, otherwise the items can get lost :(
		// in some frameworks like Durandal
		await checkTodosInLocalStorage(page, TODO_ITEMS[0]);
	});

	test('should allow me to display active items', async ({ page }) => {
		const todoItem = page.getByTestId('todo-item');
		await page.getByTestId('todo-item').nth(1).getByRole('checkbox').check();

		await checkNumberOfCompletedTodosInLocalStorage(page, 1);
		await page.getByRole('link', { name: 'Active' }).click();
		await expect(todoItem).toHaveCount(2);
		await expect(todoItem).toHaveText([TODO_ITEMS[0], TODO_ITEMS[2]]);
	});

	test('should respect the back button', async ({ page }) => {
		const todoItem = page.getByTestId('todo-item');
		await page.getByTestId('todo-item').nth(1).getByRole('checkbox').check();

		await checkNumberOfCompletedTodosInLocalStorage(page, 1);

		await test.step('Showing all items', async () => {
			await page.getByRole('link', { name: 'All' }).click();
			await expect(todoItem).toHaveCount(3);
		});

		await test.step('Showing active items', async () => {
			await page.getByRole('link', { name: 'Active' }).click();
		});

		await test.step('Showing completed items', async () => {
			await page.getByRole('link', { name: 'Completed' }).click();
		});

		await expect(todoItem).toHaveCount(1);
		await page.goBack();
		await expect(todoItem).toHaveCount(2);
		await page.goBack();
		await expect(todoItem).toHaveCount(3);
	});

	test('should allow me to display completed items', async ({ page }) => {
		await page.getByTestId('todo-item').nth(1).getByRole('checkbox').check();
		await checkNumberOfCompletedTodosInLocalStorage(page, 1);
		await page.getByRole('link', { name: 'Completed' }).click();
		await expect(page.getByTestId('todo-item')).toHaveCount(1);
	});

	test('should allow me to display all items', async ({ page }) => {
		await page.getByTestId('todo-item').nth(1).getByRole('checkbox').check();
		await checkNumberOfCompletedTodosInLocalStorage(page, 1);
		await page.getByRole('link', { name: 'Active' }).click();
		await page.getByRole('link', { name: 'Completed' }).click();
		await page.getByRole('link', { name: 'All' }).click();
		await expect(page.getByTestId('todo-item')).toHaveCount(3);
	});

	test('should highlight the currently applied filter', async ({ page }) => {
		await expect(page.getByRole('link', { name: 'All' })).toHaveClass('selected');

		//create locators for active and completed links
		const activeLink = page.getByRole('link', { name: 'Active' });
		const completedLink = page.getByRole('link', { name: 'Completed' });
		await activeLink.click();

		// Page change - active items.
		await expect(activeLink).toHaveClass('selected');
		await completedLink.click();

		// Page change - completed items.
		await expect(completedLink).toHaveClass('selected');
	});
});

async function createDefaultTodos(page) {
	// create a new todo locator
	const newTodo = page.getByPlaceholder('What needs to be done?');

	for (const item of TODO_ITEMS) {
		await newTodo.fill(item);
		await newTodo.press('Enter');
	}
}

async function checkNumberOfTodosInLocalStorage(page: Page, expected: number) {
	return await page.waitForFunction(e => {
		return JSON.parse(localStorage['react-todos']).length === e;
	}, expected);
}

async function checkNumberOfCompletedTodosInLocalStorage(page: Page, expected: number) {
	return await page.waitForFunction(e => {
		return JSON.parse(localStorage['react-todos']).filter((todo: any) => todo.completed).length === e;
	}, expected);
}

async function checkTodosInLocalStorage(page: Page, title: string) {
	return await page.waitForFunction(t => {
		return JSON.parse(localStorage['react-todos'])
			.map((todo: any) => todo.title)
			.includes(t);
	}, title);
}