// @ts-check
// Tests: post form "More location details" — search-by-city lookup + draggable
// map pin preview for setting an entry's coordinates without live GPS.
// Covers R4-R14. The Open-Meteo geocoding endpoint is mocked via page.route()
// so this suite is hermetic (no live third-party call, no rate-limit flakiness).
const { test, expect } = require('@playwright/test');
const path = require('path');
const { fillEditor, waitForPhotoUpload, cleanupEntry, findEntry, readEntryMd, TEST_PHOTO } = require('../helpers');

const GEOCODE_URL = '**/geocoding-api.open-meteo.com/v1/search**';

const created = [];
test.afterAll(() => { created.forEach(cleanupEntry); });

// Real-API-shaped fixtures (verified live against geocoding-api.open-meteo.com).
const KYOTO_RESULTS = {
    results: [
        { name: 'Kyoto', latitude: 35.0116, longitude: 135.7681, admin1: 'Kyoto Prefecture', country: 'Japan' }
    ]
};

// Mirrors the design doc's verified live Paris query: Île-de-France (France)
// first from the API, then five US states — Texas among them, in admin1 (the
// API's `country` field is "United States" for all of the US matches, so the
// ranking must also check admin1 to disambiguate on a US state name).
const PARIS_RESULTS = {
    results: [
        { name: 'Paris', latitude: 48.85341, longitude: 2.3488, admin1: 'Île-de-France Region', country: 'France' },
        { name: 'Paris', latitude: 33.66094, longitude: -95.55551, admin1: 'Texas', country: 'United States' },
        { name: 'Paris', latitude: 36.302, longitude: -88.32671, admin1: 'Tennessee', country: 'United States' },
        { name: 'Paris', latitude: 38.2098, longitude: -84.2529, admin1: 'Kentucky', country: 'United States' },
        { name: 'Paris', latitude: 39.6112, longitude: -87.6961, admin1: 'Illinois', country: 'United States' }
    ]
};

function mockGeocode(page, body) {
    return page.route(GEOCODE_URL, (route) => route.fulfill({
        status: 200,
        contentType: 'application/json',
        body: JSON.stringify(body)
    }));
}

async function openLocationDetails(page) {
    await page.locator('.location-details__summary').click();
    await expect(page.locator('.location-details')).toHaveJSProperty('open', true);
}

// ── Panel closed by default (R1) ────────────────────────────────────────────
test('More location details is closed by default and holds the relocated lat/lng fields', async ({ page }) => {
    await page.goto('/post');
    const details = page.locator('.location-details');
    await expect(details).toBeAttached();
    await expect(details).toHaveJSProperty('open', false);
    await expect(page.locator('.location-details input[name="data[lat]"]')).toBeAttached();
    await expect(page.locator('.location-details input[name="data[lng]"]')).toBeAttached();
});

// ── R6: empty City + Country sends no request ───────────────────────────────
test('R6: clicking lookup with City and Country both empty sends no request', async ({ page }) => {
    await page.goto('/post');
    let requested = false;
    await page.route(GEOCODE_URL, (route) => { requested = true; route.abort(); });
    await openLocationDetails(page);
    await page.click('#lookup-coords');
    await expect(page.locator('#location-search-hint')).toContainText(/city or country/i);
    expect(requested).toBe(false);
});

// ── R7: a search result sets lat/lng only, never City/Country ──────────────
test('R7: clicking a search result sets lat/lng and leaves City/Country untouched', async ({ page }) => {
    await page.goto('/post');
    await mockGeocode(page, KYOTO_RESULTS);
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    const results = page.locator('.location-search-results li button');
    await expect(results).toHaveCount(1);
    await results.first().click();

    await expect(page.locator('input[name="data[lat]"]')).toHaveValue('35.011600');
    await expect(page.locator('input[name="data[lng]"]')).toHaveValue('135.768100');
    await expect(page.locator('input[name="data[location_city]"]')).toHaveValue('Kyoto');
    await expect(page.locator('input[name="data[location_country]"]')).toHaveValue('');
    // R7: the list hides again until the next lookup.
    await expect(page.locator('.location-search-results li')).toHaveCount(0);
});

// ── R4/KTD2: Paris/Texas disambiguation ranks the Texas match first ─────────
test('disambiguation: City "Paris" + Country "Texas" ranks the Texas match first', async ({ page }) => {
    await page.goto('/post');
    let requestedUrl = null;
    await page.route(GEOCODE_URL, (route) => {
        requestedUrl = route.request().url();
        route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(PARIS_RESULTS) });
    });
    await page.fill('input[name="data[location_city]"]', 'Paris');
    await page.fill('input[name="data[location_country]"]', 'Texas');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    const results = page.locator('.location-search-results li button');
    await expect(results).toHaveCount(5);
    await expect(results.first()).toContainText('Texas');

    // R4: Country is never concatenated into the query string.
    expect(requestedUrl).toContain('name=Paris');
    expect(requestedUrl).not.toContain('Texas');
});

// ── R8: no matches shows the inline hint, fields untouched ─────────────────
test('R8: no matches shows the no-match hint and leaves fields untouched', async ({ page }) => {
    await page.goto('/post');
    await mockGeocode(page, { results: [] });
    await page.fill('input[name="data[location_city]"]', 'Nowheresville');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    await expect(page.locator('#location-search-hint')).toContainText(/no matches/i);
    await expect(page.locator('input[name="data[lat]"]')).toHaveValue('');
    await expect(page.locator('input[name="data[lng]"]')).toHaveValue('');
});

// ── R5: in-flight state shows "Searching…" and always re-enables ───────────
test('R5: the lookup button shows a disabled "Searching…" state while in flight', async ({ page }) => {
    await page.goto('/post');
    await page.route(GEOCODE_URL, async (route) => {
        await new Promise((r) => setTimeout(r, 400));
        route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(KYOTO_RESULTS) });
    });
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    const btn = page.locator('#lookup-coords');
    await expect(btn).toBeDisabled();
    await expect(btn).toHaveText('Searching…');
    await expect(btn).toBeEnabled({ timeout: 5_000 });
    await expect(btn).toContainText('Look up coordinates');
});

// ── R8: a network failure degrades silently and re-enables the button ──────
test('a network failure degrades silently, leaves fields untouched, and re-enables the button', async ({ page }) => {
    await page.goto('/post');
    await page.route(GEOCODE_URL, (route) => route.abort('failed'));
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    await expect(page.locator('#lookup-coords')).toBeEnabled();
    await expect(page.locator('input[name="data[lat]"]')).toHaveValue('');
    await expect(page.locator('input[name="data[lng]"]')).toHaveValue('');
});

// ── XSS safety: an API-sourced name containing markup renders as literal text ──
test('a result name containing markup renders as literal text, not executed', async ({ page }) => {
    await page.goto('/post');
    await mockGeocode(page, {
        results: [{ name: '<img src=x onerror="window.__xss=true">', latitude: 1, longitude: 2, country: 'Nowhere' }]
    });
    await page.fill('input[name="data[location_city]"]', 'Test');
    await openLocationDetails(page);
    await page.click('#lookup-coords');

    const btn = page.locator('.location-search-results li button').first();
    await expect(btn).toContainText('<img src=x onerror="window.__xss=true">');
    expect(await btn.evaluate((el) => el.querySelector('img'))).toBeNull();
    expect(await page.evaluate(() => window.__xss)).toBeUndefined();
});

// ── U4: map renders exactly one canvas, no pin until a coordinate is set ───
test('opening the panel renders exactly one map canvas with no initial pin', async ({ page }) => {
    await page.goto('/post');
    await openLocationDetails(page);
    await expect(page.locator('#location-map canvas.maplibregl-canvas')).toHaveCount(1, { timeout: 10_000 });
    await expect(page.locator('#location-map .maplibregl-marker')).toHaveCount(0);
});

// ── U4: reopening does not duplicate the canvas; resize keeps it non-zero ──
test('reopening the panel a second time leaves exactly one canvas with non-zero size', async ({ page }) => {
    await page.goto('/post');
    await openLocationDetails(page);
    await page.locator('.location-details__summary').click(); // close
    await expect(page.locator('.location-details')).toHaveJSProperty('open', false);
    await openLocationDetails(page); // reopen

    const canvases = page.locator('#location-map canvas.maplibregl-canvas');
    await expect(canvases).toHaveCount(1, { timeout: 10_000 });
    const box = await canvases.first().boundingBox();
    expect(box && box.width).toBeGreaterThan(0);
    expect(box && box.height).toBeGreaterThan(0);
});

// ── R11: a search pick shows a pin on the map ───────────────────────────────
test('a search-result pick renders a pin on the map', async ({ page }) => {
    await page.goto('/post');
    await mockGeocode(page, KYOTO_RESULTS);
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');
    await page.locator('.location-search-results li button').first().click();

    await expect(page.locator('#location-map .maplibregl-marker')).toHaveCount(1, { timeout: 10_000 });
});

// ── R11: dragging the marker updates lat/lng (rounded to 6dp) ──────────────
test('dragging the pin updates lat/lng to the drop location', async ({ page }) => {
    await page.goto('/post');
    await mockGeocode(page, KYOTO_RESULTS);
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');
    await page.locator('.location-search-results li button').first().click();

    const marker = page.locator('#location-map .maplibregl-marker');
    await expect(marker).toHaveCount(1, { timeout: 10_000 });
    const before = await page.locator('input[name="data[lat]"]').inputValue();

    // setPin()'s map.panTo() animates the marker into view — wait for it to
    // settle so the bounding box grabbed below matches where the marker will
    // actually be when the mouse events land.
    await page.waitForTimeout(800);
    const box = await marker.boundingBox();
    if (!box) throw new Error('marker has no bounding box');
    const startX = box.x + box.width / 2;
    const startY = box.y + box.height / 2;
    await page.mouse.move(startX, startY);
    await page.mouse.down();
    await page.mouse.move(startX + 40, startY + 30, { steps: 5 });
    await page.mouse.up();

    await expect(async () => {
        const after = await page.locator('input[name="data[lat]"]').inputValue();
        expect(after).not.toBe(before);
        expect(after).toMatch(/^-?\d+\.\d{6}$/);
    }).toPass({ timeout: 5_000 });
});

// ── R11/R13: typing an invalid value flags the field without crashing ──────
test('typing an invalid lat value shows the mismatch flag and clears once fixed', async ({ page }) => {
    await page.goto('/post');
    await openLocationDetails(page);

    const latEl = page.locator('input[name="data[lat]"]');
    const lngEl = page.locator('input[name="data[lng]"]');
    await latEl.fill('not-a-number');
    await lngEl.fill('135.7681');
    await lngEl.blur();

    await expect(latEl).toHaveClass(/location-field--mismatch/);
    await expect(latEl).toHaveAttribute('aria-invalid', 'true');
    await expect(page.locator('#location-map .maplibregl-marker')).toHaveCount(0);

    await latEl.fill('35.0116');
    await latEl.blur();
    await expect(latEl).not.toHaveClass(/location-field--mismatch/);
    await expect(page.locator('#location-map .maplibregl-marker')).toHaveCount(1);
});

// ── U4: rapid close/reopen while the maplibre-gl chunk is still in flight must
// not build two Map instances against the same container (code-review fix) ──
test('rapid close/reopen before the maplibre-gl chunk resolves still leaves exactly one canvas', async ({ page }) => {
    await page.route('**/*maplibre-gl*.js', async (route) => {
        await new Promise((resolve) => setTimeout(resolve, 500));
        await route.continue();
    });
    await page.goto('/post');

    // Open, then immediately close and reopen — both toggles land while the
    // delayed chunk request above is still pending.
    await page.locator('.location-details__summary').click();
    await page.locator('.location-details__summary').click();
    await page.locator('.location-details__summary').click();
    await expect(page.locator('.location-details')).toHaveJSProperty('open', true);

    await expect(page.locator('#location-map canvas.maplibregl-canvas')).toHaveCount(1, { timeout: 10_000 });
});

// ── U5: blanking both fields after a mismatch was flagged clears the flag ──
test('blanking both lat/lng fields after a mismatch clears the flag', async ({ page }) => {
    await page.goto('/post');
    await openLocationDetails(page);

    const latEl = page.locator('input[name="data[lat]"]');
    const lngEl = page.locator('input[name="data[lng]"]');
    await latEl.fill('not-a-number');
    await lngEl.blur();
    await expect(latEl).toHaveClass(/location-field--mismatch/);

    await latEl.fill('');
    await lngEl.fill('');
    await lngEl.blur();
    await expect(latEl).not.toHaveClass(/location-field--mismatch/);
    await expect(lngEl).not.toHaveClass(/location-field--mismatch/);
});

// ── U5: a flagged, unresolved lat/lng must block submit (code-review fix) ──
test('submitting with an unresolved lat/lng mismatch is blocked', async ({ page }) => {
    const tag = `loc-mismatch-${Date.now()}`;
    await page.goto('/post');
    await page.fill('input[name="data[title]"]', `UI Test ${tag}`);
    await fillEditor(page, 'Location-override mismatch-blocks-submit guard. Safe to delete.');
    await page.locator('input.filepond--browser').setInputFiles(TEST_PHOTO);
    await waitForPhotoUpload(page);

    await openLocationDetails(page);
    const latEl = page.locator('input[name="data[lat]"]');
    const lngEl = page.locator('input[name="data[lng]"]');
    await latEl.fill('999');
    await lngEl.fill('999');
    await lngEl.blur();
    await expect(latEl).toHaveClass(/location-field--mismatch/);

    // Register for cleanup BEFORE the click: if the gate ever regresses, the
    // entry lands on disk and the afterAll hook must still see the tag.
    created.push(tag);
    await page.locator('.btn-post').evaluate((el) => el.click());

    // `.notices` toHaveCount(0) and toHaveURL(/\/post/) both pass instantly and
    // both also hold for a SUCCESSFUL submit (the form posts to /post and only
    // renders its notice after the round trip), so neither can distinguish a
    // working gate from a regressed one. Prove the negative on disk instead,
    // after giving a regressed submit time to actually write.
    await page.waitForTimeout(2000);
    expect(findEntry(tag), 'a flagged coordinate must never reach the server').toBeFalsy();
    // And prove the block was the gate's doing: still flagged, value untouched.
    await expect(latEl).toHaveClass(/location-field--mismatch/);
    await expect(latEl).toHaveValue('999');
});

// ── U4: lazy-load boundary — an ordinary GPS-only submit never fetches maplibre-gl ──
// The URL pattern deliberately covers BOTH halves of the lazy boundary: the JS
// chunk (js/post/maplibre-gl-*.js) and the stylesheet
// (css-compiled/maplibre-gl.css, <link>ed by location-map.js at panel-open —
// see its ensureMaplibreCss). Neither may be requested when the panel stays shut.
test('an ordinary submit without opening the panel never fetches the maplibre-gl chunk', async ({ page }) => {
    const chunkRequests = [];
    page.on('request', (req) => {
        if (/maplibre-gl/.test(req.url())) chunkRequests.push(req.url());
    });

    const tag = `loc-nomap-${Date.now()}`;
    await page.goto('/post');
    await page.fill('input[name="data[title]"]', `UI Test ${tag}`);
    await fillEditor(page, 'Location-override lazy-load guard. Safe to delete.');
    await page.locator('input.filepond--browser').setInputFiles(TEST_PHOTO);
    await waitForPhotoUpload(page);
    await page.locator('.btn-post').evaluate((el) => el.click());
    await expect(page.locator('.notices')).toContainText('Entry posted successfully!', { timeout: 15_000 });
    created.push(tag);

    expect(chunkRequests, 'neither the maplibre-gl chunk nor its stylesheet may be fetched when the panel is never opened').toHaveLength(0);
});

// ── The other half of that boundary: opening the panel DOES apply the vendor CSS ──
// Without this, the guard above could keep passing while the stylesheet silently
// stopped loading at all (a broken href, a missed build step), leaving the map
// unstyled with nothing to catch it. Asserts the <link> exists AND parsed —
// link.sheet is null until the browser has actually applied it.
test('opening the panel lazily links maplibre\'s stylesheet and applies it', async ({ page }) => {
    await page.goto('/post');

    const hrefBefore = await page.evaluate(() => Array.from(document.styleSheets)
        .map((s) => s.href || '').filter((h) => /maplibre-gl\.css/.test(h)));
    expect(hrefBefore, 'the vendor stylesheet must not be present before the panel opens').toHaveLength(0);

    await openLocationDetails(page);
    await expect(page.locator('#location-map canvas.maplibregl-canvas')).toHaveCount(1, { timeout: 10_000 });

    await expect.poll(
        () => page.evaluate(() => {
            const link = Array.from(document.querySelectorAll('link[rel="stylesheet"]'))
                .find((l) => /maplibre-gl\.css/.test(l.href));
            return link ? link.sheet !== null : false;
        }),
        { message: 'maplibre\'s stylesheet must be linked and applied once the panel opens', timeout: 10_000 }
    ).toBe(true);
});

// ── Full submit: a search-picked location round-trips into the frontmatter ──
test('a full submit with a search-picked location saves the expected lat/lng', async ({ page }) => {
    const tag = `loc-submit-${Date.now()}`;
    await page.goto('/post');
    await mockGeocode(page, KYOTO_RESULTS);
    await page.fill('input[name="data[title]"]', `UI Test ${tag}`);
    await fillEditor(page, 'Location-override submit test. Safe to delete.');
    await page.fill('input[name="data[location_city]"]', 'Kyoto');
    await openLocationDetails(page);
    await page.click('#lookup-coords');
    await page.locator('.location-search-results li button').first().click();

    await page.locator('input.filepond--browser').setInputFiles(TEST_PHOTO);
    await waitForPhotoUpload(page);
    await page.locator('.btn-post').evaluate((el) => el.click());
    await expect(page.locator('.notices')).toContainText('Entry posted successfully!', { timeout: 15_000 });
    created.push(tag);

    const entryDir = findEntry(tag);
    expect(entryDir, 'Entry folder should exist on disk').toBeTruthy();
    const md = readEntryMd(entryDir);
    expect(md).toContain('35.0116');
    expect(md).toContain('135.7681');
});