import { test, expect } from '@playwright/test';
import { execSync } from 'child_process';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

// Extract port from PLAYWRIGHT_BASE_URL or use default (4173 matches playwright.config.ts)
const baseUrl = process.env.PLAYWRIGHT_BASE_URL || 'http://localhost:4173';
const urlMatch = baseUrl.match(/:(\d+)$/);
const PORT = urlMatch ? urlMatch[1] : '4173';
const ALPHA_URL = `http://ecole-alpha.classeo.local:${PORT}`;

// Test credentials
const ADMIN_EMAIL = 'e2e-classes-admin@example.com';
const ADMIN_PASSWORD = 'ClassesTest123';

// Force serial execution to ensure Empty State runs first
test.describe.configure({ mode: 'serial' });

test.describe('Classes Management (Story 2.1)', () => {
	// Create admin user and clean up classes before running tests
	test.beforeAll(async () => {
		const projectRoot = join(__dirname, '../..');
		const composeFile = join(projectRoot, 'compose.yaml');

		try {
			// Create admin user
			execSync(
				`docker compose -f "${composeFile}" exec -T php php bin/console app:dev:create-test-user --tenant=ecole-alpha --email=${ADMIN_EMAIL} --password=${ADMIN_PASSWORD} --role=ROLE_ADMIN 2>&1`,
				{ encoding: 'utf-8' }
			);
			console.log('Classes E2E test admin user created');

			// Clean up all classes for this tenant to ensure Empty State test works
			execSync(
				`docker compose -f "${composeFile}" exec -T php php bin/console dbal:run-sql "DELETE FROM school_classes WHERE tenant_id = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'" 2>&1`,
				{ encoding: 'utf-8' }
			);
			console.log('Classes cleaned up for E2E tests');
		} catch (error) {
			console.error('Setup error:', error);
		}
	});

	// Helper to login as admin
	async function loginAsAdmin(page: import('@playwright/test').Page) {
		await page.goto(`${ALPHA_URL}/login`);
		await page.locator('#email').fill(ADMIN_EMAIL);
		await page.locator('#password').fill(ADMIN_PASSWORD);
		await page.getByRole('button', { name: /se connecter/i }).click();
		await expect(page).toHaveURL(/\/dashboard/, { timeout: 10000 });
	}

	// Helper to open "Nouvelle classe" dialog with proper wait
	async function openNewClassDialog(page: import('@playwright/test').Page) {
		const button = page.getByRole('button', { name: /nouvelle classe/i });
		await button.waitFor({ state: 'visible' });

		// Wait for any pending network requests to finish before clicking
		await page.waitForLoadState('networkidle');

		// Click the button
		await button.click();

		// Wait for dialog to appear - retry click if needed (webkit timing issue)
		const dialog = page.getByRole('dialog');
		try {
			await expect(dialog).toBeVisible({ timeout: 5000 });
		} catch {
			// Retry once - webkit sometimes needs a second click
			await button.click();
			await expect(dialog).toBeVisible({ timeout: 10000 });
		}
	}

	// ============================================================================
	// EMPTY STATE - Must run FIRST before any class is created
	// ============================================================================
	test.describe('Empty State', () => {
		test('shows empty state message when no classes exist', async ({ page }) => {
			// Clean up classes right before this specific test to avoid race conditions with parallel browsers
			const projectRoot = join(__dirname, '../..');
			const composeFile = join(projectRoot, 'compose.yaml');
			try {
				execSync(
					`docker compose -f "${composeFile}" exec -T php php bin/console dbal:run-sql "DELETE FROM school_classes WHERE tenant_id = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'" 2>&1`,
					{ encoding: 'utf-8' }
				);
			} catch {
				// Ignore cleanup errors
			}

			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Wait for page to load
			await expect(page.getByRole('heading', { name: /gestion des classes/i })).toBeVisible();

			// Should show empty state
			await expect(page.locator('.empty-state')).toBeVisible();
			await expect(page.getByText(/aucune classe/i)).toBeVisible();
			await expect(page.getByRole('button', { name: /créer une classe/i })).toBeVisible();
		});
	});

	// ============================================================================
	// List Display
	// ============================================================================
	test.describe('List Display', () => {
		test('displays all created classes in the list', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create multiple classes
			const classNames = [
				`Liste-6emeA-${Date.now()}`,
				`Liste-6emeB-${Date.now()}`,
				`Liste-5emeA-${Date.now()}`,
			];

			for (const name of classNames) {
				await openNewClassDialog(page);
				await page.locator('#class-name').fill(name);
				await page.getByRole('button', { name: /créer la classe/i }).click();
				await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });
			}

			// Verify ALL classes appear in the list
			for (const name of classNames) {
				await expect(page.getByText(name)).toBeVisible();
			}

			// Verify the number of class cards matches (at least the ones we created)
			const classCards = page.locator('.class-card');
			const count = await classCards.count();
			expect(count).toBeGreaterThanOrEqual(classNames.length);
		});

		test('displays class details correctly (level, capacity)', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create a class with all details
			const className = `Details-${Date.now()}`;
			await openNewClassDialog(page);
			await page.locator('#class-name').fill(className);
			await page.locator('#class-level').selectOption('CM2');
			await page.locator('#class-capacity').fill('25');
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });

			// Find the class card
			const classCard = page.locator('.class-card', { hasText: className });
			await expect(classCard).toBeVisible();

			// Verify details are displayed
			await expect(classCard.getByText('CM2')).toBeVisible();
			await expect(classCard.getByText('25 places')).toBeVisible();
			await expect(classCard.getByText('Active')).toBeVisible();
		});
	});

	// ============================================================================
	// AC1: Class Creation
	// ============================================================================
	test.describe('AC1: Class Creation', () => {
		test('can create a new class with all fields', async ({ page }) => {
			await loginAsAdmin(page);

			// Navigate to classes page
			await page.goto(`${ALPHA_URL}/admin/classes`);
			await expect(page.getByRole('heading', { name: /gestion des classes/i })).toBeVisible();

			// Click "Nouvelle classe" button
			await openNewClassDialog(page);
			await expect(page.getByRole('heading', { name: /nouvelle classe/i })).toBeVisible();

			// Fill form
			const uniqueName = `Test-E2E-${Date.now()}`;
			await page.locator('#class-name').fill(uniqueName);
			await page.locator('#class-level').selectOption('6ème');
			await page.locator('#class-capacity').fill('30');

			// Submit
			await page.getByRole('button', { name: /créer la classe/i }).click();

			// Modal should close and class should appear in list
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });
			await expect(page.getByText(uniqueName)).toBeVisible({ timeout: 10000 });
		});

		test('can create a class with only required fields (name)', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			await openNewClassDialog(page);

			// Fill only the name (required)
			const uniqueName = `Minimal-${Date.now()}`;
			await page.locator('#class-name').fill(uniqueName);

			// Submit button should be enabled
			const submitButton = page.getByRole('button', { name: /créer la classe/i });
			await expect(submitButton).toBeEnabled();

			await submitButton.click();

			// Class should be created
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });
			await expect(page.getByText(uniqueName)).toBeVisible({ timeout: 10000 });
		});

		test('submit button is disabled when name is empty', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			await openNewClassDialog(page);

			// Don't fill the name
			const submitButton = page.getByRole('button', { name: /créer la classe/i });
			await expect(submitButton).toBeDisabled();

			// Fill level and capacity but not name
			await page.locator('#class-level').selectOption('CE1');
			await page.locator('#class-capacity').fill('25');
			await expect(submitButton).toBeDisabled();

			// Fill name - button should enable
			await page.locator('#class-name').fill('Test');
			await expect(submitButton).toBeEnabled();
		});

		test('can cancel class creation', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			await openNewClassDialog(page);

			// Fill form
			await page.locator('#class-name').fill('Should-Not-Be-Created');

			// Click cancel
			await page.getByRole('button', { name: /annuler/i }).click();

			// Modal should close
			await expect(page.getByRole('dialog')).not.toBeVisible();

			// Class should not appear in list
			await expect(page.getByText('Should-Not-Be-Created')).not.toBeVisible();
		});
	});

	// ============================================================================
	// AC2: Class Modification
	// ============================================================================
	test.describe('AC2: Class Modification', () => {
		test('can modify an existing class', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// First create a class to modify
			await openNewClassDialog(page);
			const originalName = `ToModify-${Date.now()}`;
			await page.locator('#class-name').fill(originalName);
			await page.locator('#class-level').selectOption('CM1');
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });

			// Find the class card and click modify
			const classCard = page.locator('.class-card', { hasText: originalName });
			await classCard.getByRole('button', { name: /modifier/i }).click();

			// Should navigate to edit page
			await expect(page).toHaveURL(/\/admin\/classes\/[\w-]+/);
			await expect(page.getByRole('heading', { name: /modifier la classe/i })).toBeVisible();

			// Modify the name
			const newName = `Modified-${Date.now()}`;
			await page.locator('#class-name').fill(newName);
			await page.locator('#class-level').selectOption('CM2');
			await page.locator('#class-capacity').fill('28');

			// Save
			await page.getByRole('button', { name: /enregistrer/i }).click();

			// Should show success message
			await expect(page.getByText(/modifiée avec succès/i)).toBeVisible({ timeout: 10000 });

			// Go back to list and verify
			await page.goto(`${ALPHA_URL}/admin/classes`);
			await expect(page.getByText(newName)).toBeVisible();
		});

		test('can cancel modification', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create a class
			await openNewClassDialog(page);
			const originalName = `NoChange-${Date.now()}`;
			await page.locator('#class-name').fill(originalName);
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });

			// Click modify
			const classCard = page.locator('.class-card', { hasText: originalName });
			await classCard.getByRole('button', { name: /modifier/i }).click();

			// Modify but cancel
			await page.locator('#class-name').fill('Should-Not-Change');
			await page.getByRole('button', { name: /annuler/i }).click();

			// Should go back to list
			await expect(page).toHaveURL(/\/admin\/classes$/);

			// Original name should still be there
			await expect(page.getByText(originalName)).toBeVisible();
			await expect(page.getByText('Should-Not-Change')).not.toBeVisible();
		});
	});

	// ============================================================================
	// AC3: Deletion blocked if students assigned
	// ============================================================================
	test.describe('AC3: Deletion blocked if students assigned', () => {
		// SKIP REASON: The Students module is not yet implemented.
		// HasStudentsInClassHandler currently returns 0 (stub), so all classes
		// appear empty and can be deleted. This test will be enabled once the
		// Students module allows assigning students to classes.
		//
		// When enabled, this test should:
		// 1. Create a class
		// 2. Assign at least one student to it
		// 3. Attempt to delete the class
		// 4. Verify the error message "Vous devez d'abord réaffecter les élèves"
		// 5. Verify the class still exists
		test.skip('shows warning when trying to delete class with students', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);
			// Implementation pending Students module
		});
	});

	// ============================================================================
	// AC4: Empty class deletion (soft delete)
	// ============================================================================
	test.describe('AC4: Empty class deletion (soft delete)', () => {
		test('can delete an empty class', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create a class to delete
			await openNewClassDialog(page);
			const className = `ToDelete-${Date.now()}`;
			await page.locator('#class-name').fill(className);
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });
			await expect(page.getByText(className)).toBeVisible();

			// Find and click delete button
			const classCard = page.locator('.class-card', { hasText: className });
			await classCard.getByRole('button', { name: /supprimer/i }).click();

			// Confirmation modal should appear
			const deleteModal = page.getByRole('alertdialog');
			await expect(deleteModal).toBeVisible({ timeout: 10000 });
			await expect(deleteModal.getByText(className)).toBeVisible();

			// Confirm deletion
			await deleteModal.getByRole('button', { name: /supprimer/i }).click();

			// Modal should close and class should no longer appear in list
			await expect(deleteModal).not.toBeVisible({ timeout: 10000 });
			await expect(page.getByText(className)).not.toBeVisible({ timeout: 10000 });
		});

		test('can cancel deletion', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create a class
			await openNewClassDialog(page);
			const className = `NoDelete-${Date.now()}`;
			await page.locator('#class-name').fill(className);
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });

			// Find and click delete
			const classCard = page.locator('.class-card', { hasText: className });
			await classCard.getByRole('button', { name: /supprimer/i }).click();

			// Confirmation modal should appear
			const deleteModal = page.getByRole('alertdialog');
			await expect(deleteModal).toBeVisible({ timeout: 10000 });

			// Cancel deletion
			await deleteModal.getByRole('button', { name: /annuler/i }).click();

			// Modal should close and class should still be there
			await expect(deleteModal).not.toBeVisible({ timeout: 10000 });
			await expect(page.getByText(className)).toBeVisible();
		});
	});

	// ============================================================================
	// Navigation
	// ============================================================================
	test.describe('Navigation', () => {
		test('can access classes page directly', async ({ page }) => {
			await loginAsAdmin(page);

			// Navigate directly to classes page
			await page.goto(`${ALPHA_URL}/admin/classes`);

			await expect(page).toHaveURL(/\/admin\/classes/);
			await expect(page.getByRole('heading', { name: /gestion des classes/i })).toBeVisible();
		});

		test('breadcrumb navigation works on edit page', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			// Create a class
			await openNewClassDialog(page);
			const className = `Breadcrumb-${Date.now()}`;
			await page.locator('#class-name').fill(className);
			await page.getByRole('button', { name: /créer la classe/i }).click();
			await expect(page.getByRole('dialog')).not.toBeVisible({ timeout: 10000 });

			// Go to edit page
			const classCard = page.locator('.class-card', { hasText: className });
			await classCard.getByRole('button', { name: /modifier/i }).click();

			// Click breadcrumb to go back
			await page.getByRole('link', { name: 'Classes' }).click();

			await expect(page).toHaveURL(/\/admin\/classes$/);
		});
	});

	// ============================================================================
	// Validation
	// ============================================================================
	test.describe('Validation', () => {
		test('shows validation for class name length', async ({ page }) => {
			await loginAsAdmin(page);
			await page.goto(`${ALPHA_URL}/admin/classes`);

			await openNewClassDialog(page);

			// Try a name that's too short (1 char)
			await page.locator('#class-name').fill('A');

			// The HTML5 minlength validation should prevent submission
			// or show an error
			const nameInput = page.locator('#class-name');
			const isInvalid = await nameInput.evaluate(
				(el: HTMLInputElement) => !el.validity.valid
			);
			expect(isInvalid).toBe(true);
		});
	});
});