import { test, expect } from '@playwright/test';
import { MOCK_FS_INIT_SCRIPT } from './fixtures/mock-fs-api.js';
import * as path from 'path';

const HTML_PATH = path.resolve('browse/dist/browse.html');

test.describe('Browse', () => {
    test.beforeEach(async ({ page }) => {
        await page.addInitScript(MOCK_FS_INIT_SCRIPT);
    });

    test('loads with the empty state visible and add-directory button enabled', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        // file:// + no auto-server-root → the empty state is shown and the
        // browse table stays hidden until the user picks a directory.
        await expect(page.locator('#emptyState')).toBeVisible();
        await expect(page.locator('#browseRoot')).toBeHidden();

        const addDirBtn = page.locator('#addDirectoryBtn');
        await expect(addDirBtn).toBeVisible();
        await expect(addDirBtn).not.toBeDisabled();
    });

    test('renders rows from a mock directory after picking', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        await page.evaluate(() => {
            window.__setMockDirectory('docs', [
                { name: 'spec.pdf',    content: '%PDF-fixture',           size: 1024 },
                { name: 'readme.md',   content: '# Hello\n',              size: 8 },
                { name: 'notes.txt',   content: 'note one\nnote two\n',   size: 16 },
            ]);
        });

        await page.locator('#addDirectoryBtn').click();

        // Browse swaps from empty state to the two-pane layout. The
        // tree pane is on the left; rows are <div class="tree-row">.
        await page.waitForSelector('#browseRoot:not(.hidden)', { timeout: 10000 });
        await page.waitForFunction(
            () => document.querySelectorAll('#treeBody .tree-row').length >= 3,
            { timeout: 10000 }
        );

        const rows = await page.locator('#treeBody .tree-row').count();
        expect(rows).toBeGreaterThanOrEqual(3);

        // Right preview pane is present and starts in the empty state.
        await expect(page.locator('#previewPane')).toBeVisible();
        await expect(page.locator('#previewBody')).toContainText(/Click a file/);
    });

    test('clicking a file shows it in the preview pane', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        await page.evaluate(() => {
            window.__setMockDirectory('docs', [
                { name: 'notes.txt', content: 'hello world', size: 11 },
            ]);
        });
        await page.locator('#addDirectoryBtn').click();
        await page.waitForSelector('#treeBody .tree-row', { timeout: 10000 });

        // Click the file row.
        await page.locator('#treeBody .tree-row[data-isdir="false"]').first().click();

        // Preview title updates to the file name; pop-out button appears.
        await expect(page.locator('#previewTitle')).toHaveText(/notes\.txt/);
        await expect(page.locator('#previewPopout')).toBeVisible();
    });

    test('clicking a .md file mounts the markdown editor with a TOC', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        await page.evaluate(() => {
            window.__setMockDirectory('notes', [
                {
                    name: 'readme.md',
                    content: '# Title\n\nIntro.\n\n## Section One\n\nText.\n\n### Subsection\n\nDeeper.',
                    size: 100,
                },
            ]);
        });
        await page.locator('#addDirectoryBtn').click();
        await page.waitForSelector('#treeBody .tree-row[data-isdir="false"]', { timeout: 10000 });
        await page.locator('#treeBody .tree-row[data-isdir="false"]').first().click();

        // Markdown plugin DOM mounts: toolbar, editor host, TOC pane.
        await expect(page.locator('.md-toolbar')).toBeVisible({ timeout: 15000 });
        await expect(page.locator('.md-editor-host')).toBeVisible();
        await expect(page.locator('.md-toc-pane')).toBeVisible();

        // TOC enumerates the three headings.
        await page.waitForSelector('.toc-list li', { timeout: 10000 });
        const tocItems = await page.locator('.toc-list li a').allTextContents();
        expect(tocItems).toEqual(['Title', 'Section One', 'Subsection']);

        // Source hint reflects local FS-API mode.
        await expect(page.locator('.md-toolbar__source')).toHaveText(/local/i);
    });
});