import { test, expect } from '@playwright/test';
import * as path from 'path';

const HTML_PATH = path.resolve('landing/dist/index.html');
const FILE_URL = 'file://' + HTML_PATH;

// The landing page fetches its containing directory with Accept: application/json
// to get the project list. Chromium refuses fetch() on file:// URLs entirely, so
// page.route() can't help — we monkey-patch window.fetch in an init script and
// drive the response from window.__mockProjects, set per-test.

const FETCH_MOCK = `
    window.__mockProjects = [];
    const realFetch = window.fetch;
    window.fetch = async function(url, opts) {
        const accept = opts && opts.headers && opts.headers.Accept;
        if (accept && String(accept).includes('json')) {
            return new Response(JSON.stringify(window.__mockProjects), {
                status: 200,
                headers: { 'Content-Type': 'application/json' },
            });
        }
        return realFetch.apply(this, arguments);
    };
`;

const SAMPLE_PROJECTS = [
    { name: '176109', url: '/176109/', title: 'Greenfield Substation' },
    { name: '197072', url: '/197072/', title: 'Brownfield Tap' },
    { name: '210045', url: '/210045/', title: '' },
];

async function loadLandingWithProjects(page, projects) {
    await page.addInitScript({ content: FETCH_MOCK });
    await page.addInitScript(p => { window.__mockProjects = p; }, projects);
    await page.goto(FILE_URL, { waitUntil: 'domcontentloaded' });
}

test.describe('Landing page', () => {

    test('renders the welcome hero and a project table when projects come back', async ({ page }) => {
        await loadLandingWithProjects(page, SAMPLE_PROJECTS);
        await page.waitForSelector('.project-table', { timeout: 5000 });

        await expect(page.locator('.landing-hero h1')).toContainText(/Welcome/i);
        const rowCount = await page.locator('.project-table tbody tr').count();
        expect(rowCount).toBe(3);
        // Title column is shown because at least one project has a title.
        await expect(page.locator('th.project-table-title-col')).toBeVisible();
        await expect(page.locator('.project-table tbody')).toContainText('Greenfield Substation');
        await expect(page.locator('.project-table tbody')).toContainText('Brownfield Tap');
        // 210045 has no title — should render a dash placeholder, not the empty string.
        await expect(page.locator('.project-table-no-title')).toHaveCount(1);
    });

    test('column filters narrow the table; URL is updated', async ({ page }) => {
        await loadLandingWithProjects(page, SAMPLE_PROJECTS);
        await page.waitForSelector('.project-table', { timeout: 5000 });

        await page.locator('input.column-filter[data-column="pn"]').fill('176');
        await page.waitForTimeout(150);
        const rowsAfterPn = await page.locator('.project-table tbody tr').count();
        expect(rowsAfterPn).toBe(1);
        await expect(page.locator('.project-table tbody')).toContainText('176109');

        const search = await page.evaluate(() => location.search);
        expect(search).toContain('pn=176');

        await page.locator('input.column-filter[data-column="pn"]').fill('');
        await page.locator('input.column-filter[data-column="pt"]').fill('Brown');
        await page.waitForTimeout(150);
        const rowsAfterPt = await page.locator('.project-table tbody tr').count();
        expect(rowsAfterPt).toBe(1);
        await expect(page.locator('.project-table tbody')).toContainText('Brownfield Tap');
    });

    test('selecting projects enables Open Archive and writes ?projects=', async ({ page }) => {
        await loadLandingWithProjects(page, SAMPLE_PROJECTS);
        await page.waitForSelector('.project-table', { timeout: 5000 });

        await expect(page.locator('#openArchiveBtn')).toBeDisabled();

        await page.locator('.project-table-row[data-name="176109"]').click();
        await expect(page.locator('#openArchiveBtn')).toBeEnabled();
        await expect(page.locator('#selectionSummary')).toContainText('1 project selected');

        const search = await page.evaluate(() => location.search);
        expect(search).toContain('projects=176109');
    });

    test('shows a friendly empty state when the server returns no projects', async ({ page }) => {
        await loadLandingWithProjects(page, []);
        await page.waitForSelector('.project-list-empty', { timeout: 5000 });

        await expect(page.locator('.project-list-empty')).toContainText(/No projects to show/);
        await expect(page.locator('.project-list-empty')).toContainText(/access/i);
        await expect(page.locator('#openArchiveBtn')).toBeDisabled();
    });

    test('save / load named preset round-trips selection + filters', async ({ page }) => {
        await loadLandingWithProjects(page, SAMPLE_PROJECTS);
        await page.waitForSelector('.project-table', { timeout: 5000 });

        // Set up state: pick 176109 and filter title by "Green".
        await page.locator('.project-table-row[data-name="176109"]').click();
        await page.locator('input.column-filter[data-column="pt"]').fill('Green');
        await page.waitForTimeout(150);

        // Save preset (open the split-button caret menu).
        await page.locator('#openArchiveMenuBtn').click();
        await page.locator('button:has-text("Save current as preset")').click();
        await page.locator('#presetNameInput').fill('My View');
        await page.locator('button:has-text("Save")').click();

        // Clear state so we can verify preset application restores it.
        // (Manual clear: unclick the row and empty the title filter.)
        await page.locator('.project-table-row[data-name="176109"]').click();
        await page.locator('input.column-filter[data-column="pt"]').fill('');
        await page.waitForTimeout(150);
        // Sanity: nothing selected, no filter.
        const cleared = await page.evaluate(() => ({
            selectedRows: document.querySelectorAll('.project-table-row.is-selected').length,
            ptValue: document.querySelector('input.column-filter[data-column="pt"]').value,
        }));
        expect(cleared.selectedRows).toBe(0);
        expect(cleared.ptValue).toBe('');

        // Open the menu and click "Load" on the preset (apply-stay variant —
        // clicking the preset name itself would navigate to archive.html).
        await page.locator('#openArchiveMenuBtn').click();
        await page.waitForTimeout(100);
        await page.locator('.preset-menu-item:has(.preset-menu-item-name:has-text("My View")) .preset-load-btn').click();
        await page.waitForTimeout(150);

        await expect(page.locator('.project-table-row[data-name="176109"]')).toHaveClass(/is-selected/);
        const ptVal = await page.locator('input.column-filter[data-column="pt"]').inputValue();
        expect(ptVal).toBe('Green');
    });
});