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

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: shell, sidebar (front matter +
        // TOC), content (info header + editor).
        await expect(page.locator('.md-shell')).toBeVisible({ timeout: 15000 });
        await expect(page.locator('.md-shell__sidebar')).toBeVisible();
        await expect(page.locator('.md-shell__infohdr')).toBeVisible();
        await expect(page.locator('.md-shell__editor')).toBeVisible();

        // Outline lists the three headings.
        await page.waitForSelector('.md-toc__list .md-toc__item', { timeout: 10000 });
        const tocItems = await page.locator('.md-toc__list .md-toc__item').allTextContents();
        expect(tocItems).toEqual(['Title', 'Section One', 'Subsection']);

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

    test('expands a .zip transmittal folder and previews a member', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        // Build a real zip in-browser (JSZip is bundled into browse.html)
        // and hand its bytes to the mock FS as a single .zip file whose
        // name parses as a transmittal folder.
        await page.evaluate(async () => {
            const zip = new window.JSZip();
            zip.file('DOC-001 (IFI) - Spec.pdf', '%PDF-1.4 fixture body');
            zip.file('sub/note.txt', 'a note inside the zip');
            const buf = await zip.generateAsync({ type: 'uint8array' });
            window.__setMockDirectory('PartyA', [
                { name: '2025-05-12_DOC-001 (IFI) - Title.zip', content: buf, size: buf.length },
            ]);
        });
        await page.locator('#addDirectoryBtn').click();
        await page.waitForSelector('#treeBody .tree-row[data-iszip="true"]', { timeout: 10000 });

        // Expand the .zip — it should list its members like a folder.
        await page.locator('#treeBody .tree-row[data-iszip="true"]').first().click();
        await page.waitForFunction(
            () => document.querySelectorAll('#treeBody .tree-row').length >= 3,
            { timeout: 10000 }
        );
        const labels = await page.locator('#treeBody .tree-name__label').allTextContents();
        expect(labels.join('|')).toContain('DOC-001 (IFI) - Spec.pdf');
        expect(labels.join('|')).toContain('sub');

        // Drill into the subdir, then preview the text member.
        await page.locator('#treeBody .tree-row[data-isdir="true"]').last().click();
        await page.waitForFunction(
            () => Array.from(document.querySelectorAll('#treeBody .tree-name__label'))
                .some(el => el.textContent === 'note.txt'),
            { timeout: 10000 }
        );
        const noteRow = page.locator('#treeBody .tree-row', { has: page.locator('.tree-name__label', { hasText: /^note\.txt$/ }) });
        await noteRow.click();
        await expect(page.locator('#previewTitle')).toHaveText(/note\.txt/);
        await expect(page.locator('#previewBody')).toContainText('a note inside the zip');
    });

    test('Download (zip) bundles the current folder offline', async ({ page }) => {
        await page.goto(`file://${HTML_PATH}`, { waitUntil: 'load' });
        await page.waitForSelector('#addDirectoryBtn', { timeout: 15000 });

        await page.evaluate(() => {
            window.__setMockDirectoryTree('mock-folder', {
                'a.txt': 'AAA',
                'sub': { 'b.txt': 'BBB', 'deep': { 'c.txt': 'CCC' } },
                '.zddc': 'acl: { permissions: { "*": r } }',   // hidden — must not be in the zip
                '_template': { 'scaffold.txt': 'x' },          // hidden dir — must not be in the zip
            });
        });
        await page.locator('#addDirectoryBtn').click();
        await page.waitForSelector('#browseRoot:not(.hidden)', { timeout: 10000 });

        // The Download (zip) button appears once a directory is loaded.
        const dlBtn = page.locator('#downloadZipBtn');
        await expect(dlBtn).toBeVisible();

        const [download] = await Promise.all([
            page.waitForEvent('download'),
            dlBtn.click(),
        ]);
        expect(download.suggestedFilename()).toBe('mock-folder.zip');

        const file = await download.path();
        const buf = await fs.readFile(file);
        // Valid zip: starts with the local-file-header magic, non-trivial.
        expect(buf.length).toBeGreaterThan(50);
        expect(buf.subarray(0, 4)).toEqual(Buffer.from([0x50, 0x4b, 0x03, 0x04]));

        // Introspect the entries with the bundled JSZip (in-page).
        const b64 = buf.toString('base64');
        const entries = await page.evaluate(async (b64) => {
            const bin = atob(b64);
            const bytes = new Uint8Array(bin.length);
            for (let i = 0; i < bin.length; i++) bytes[i] = bin.charCodeAt(i);
            const z = await window.JSZip.loadAsync(bytes);
            return Object.keys(z.files).filter((n) => !z.files[n].dir).sort();
        }, b64);
        expect(entries).toEqual([
            'mock-folder/a.txt',
            'mock-folder/sub/b.txt',
            'mock-folder/sub/deep/c.txt',
        ]);
    });
});
