<?php
declare(strict_types=1);

/**
 * End-to-end tests for the history server, driven over real HTTP against a
 * throwaway instance (see lib/test-server.php).
 *
 * Focus is the next_due feature plus the surfaces it touches: create/update
 * validation, the missing-vs-null PUT contract, the dashboard views, and the
 * migration that adds the column.
 */

// ── Fixtures ─────────────────────────────────────────────────────────────────

/** Monotonic started_at values — (site_key, started_at) is UNIQUE. */
function next_started_at(): int {
    static $t = 1750000000;
    return $t += 3600;
}

function unique_site(string $label): string {
    static $n = 0;
    return $label . '-' . (++$n) . '.example.com';
}

/** Create a healthcheck. Returns ['id' => string, 'response' => array]. */
function create_hc(string $siteKey, array $overrides = []): array {
    static $n = 0;
    $payload = array_merge([
        // Dotted, like the plugin's uniqid() ids — also exercises the dev-router
        // path handling that plain `php -S -t public` gets wrong.
        'id'            => 'att_hc_test_' . (++$n) . '.' . bin2hex(random_bytes(3)),
        'site_key'      => $siteKey,
        'started_at'    => next_started_at(),
        'reporting_url' => 'https://' . $siteKey,
        'technician_id' => 1,
        'wp_version'    => '6.6',
        'php_version'   => '8.2',
    ], $overrides);

    $res = api('POST', '/healthchecks', $payload);
    return ['id' => (string) $payload['id'], 'response' => $res];
}

/**
 * Read a field, distinguishing "present and null" from "absent".
 *
 * `$row['k'] ?? null` collapses those two cases, which would make every
 * "the date was cleared" assertion pass even if the field vanished entirely.
 */
function field(?array $row, string $key) {
    if ($row === null) return '<<no json>>';
    return array_key_exists($key, $row) ? $row[$key] : '<<missing: ' . $key . '>>';
}

function get_hc(string $id): array {
    return api('GET', '/healthchecks/' . rawurlencode($id));
}

/** Authenticated dashboard GET (key → cookie handshake done once). */
function dash(string $path): array {
    static $cookie = null;
    if ($cookie === null) {
        $login  = api('GET', '/dashboard?key=' . rawurlencode(TestServer::API_KEY), null, null);
        $cookie = session_cookie($login) ?? '';
    }
    return api('GET', $path, null, null, ['Cookie: ' . $cookie]);
}

/** The <tr> from a dashboard table that mentions $needle — for precise assertions. */
function row_containing(string $html, string $needle): string {
    if (preg_match_all('#<tr>.*?</tr>#s', $html, $m)) {
        foreach ($m[0] as $row) {
            if (strpos($row, htmlspecialchars($needle)) !== false) return $row;
        }
    }
    return '';
}

/**
 * The session-meta block of a session detail page.
 *
 * Assertions have to be scoped to it: the page's inline stylesheet mentions
 * every status and due-state class name, so a whole-page assert_not_contains()
 * can never fail.
 */
function session_meta(string $html): string {
    return preg_match('#<div class="session-meta">.*?</div>#s', $html, $m) ? $m[0] : '';
}

function days_from_today(int $days): string {
    return date('Y-m-d', strtotime($days . ' days'));
}

// ── Health + auth ────────────────────────────────────────────────────────────

group('server: health + auth');

test('GET / is public and reports service identity', function () {
    $r = api('GET', '/', null, null);
    assert_same(200, $r['status']);
    assert_same(true, $r['json']['ok'] ?? null);
    assert_same('att-site-healthcheck-server', $r['json']['service'] ?? null);
});

test('writes require a bearer token', function () {
    $r = api('POST', '/healthchecks', ['id' => 'nope'], null);
    assert_same(401, $r['status']);
});

test('a wrong bearer token is rejected', function () {
    $r = api('GET', '/sites', null, 'not-the-key');
    assert_same(401, $r['status']);
});

// ── next_due at creation ─────────────────────────────────────────────────────

group('server: next_due on create');

test('a healthcheck can be created with a next-due date', function () {
    $site = unique_site('create-with-date');
    $hc   = create_hc($site, ['next_due' => '2026-10-01']);
    assert_same(201, $hc['response']['status'], 'create should succeed');

    $got = get_hc($hc['id']);
    assert_same(200, $got['status']);
    assert_same('2026-10-01', field($got['json'], 'next_due'));
});

test('next_due defaults to null when omitted', function () {
    $hc  = create_hc(unique_site('create-no-date'));
    $got = get_hc($hc['id']);
    assert_same(201, $hc['response']['status']);
    assert_null(field($got['json'], 'next_due'), 'column should exist and be null');
});

test('an empty next_due string is stored as null', function () {
    $hc  = create_hc(unique_site('create-empty-date'), ['next_due' => '']);
    assert_same(201, $hc['response']['status']);
    assert_null(field(get_hc($hc['id'])['json'], 'next_due'));
});

test('an impossible date is rejected and nothing is created', function () {
    $hc = create_hc(unique_site('create-bad-date'), ['next_due' => '2026-02-30']);
    assert_same(422, $hc['response']['status']);
    assert_same('invalid', $hc['response']['json']['code'] ?? null);
    assert_same(404, get_hc($hc['id'])['status'], 'rejected create must not persist');
});

test('free text and other formats are rejected', function () {
    foreach (['soon', '01/10/2026', '2026-2-3', '2026-13-01', '20261001'] as $bad) {
        $hc = create_hc(unique_site('create-bad'), ['next_due' => $bad]);
        assert_same(422, $hc['response']['status'], 'should reject: ' . $bad);
    }
});

test('a non-string next_due is rejected', function () {
    $hc = create_hc(unique_site('create-int-date'), ['next_due' => 20261001]);
    assert_same(422, $hc['response']['status']);
});

// ── next_due updates ─────────────────────────────────────────────────────────

group('server: next_due updates');

test('PUT sets a next-due date', function () {
    $hc = create_hc(unique_site('update-set'));
    $r  = api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['next_due' => '2027-01-15']);
    assert_same(200, $r['status']);
    assert_same('2027-01-15', field(get_hc($hc['id'])['json'], 'next_due'));
});

test('PUT with no next_due key leaves the date untouched', function () {
    // The missing-vs-null contract: an unrelated PUT must not wipe the schedule.
    $hc = create_hc(unique_site('update-noop'), ['next_due' => '2027-03-03']);
    $r  = api('PUT', '/healthchecks/' . rawurlencode($hc['id']), []);
    assert_same(200, $r['status']);
    assert_same('2027-03-03', field(get_hc($hc['id'])['json'], 'next_due'));
});

test('finishing a session preserves the date', function () {
    $hc  = create_hc(unique_site('update-finish'), ['next_due' => '2027-04-04']);
    $now = 1750500000;
    $r   = api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['finished_at' => $now]);
    assert_same(200, $r['status']);

    $got = get_hc($hc['id'])['json'];
    assert_same($now, (int) ($got['finished_at'] ?? 0), 'finished_at should be set');
    assert_same('2027-04-04', field($got, 'next_due'), 'finishing must not clear the date');
});

test('reopening a session preserves the date', function () {
    $hc = create_hc(unique_site('update-reopen'), ['next_due' => '2027-05-05']);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['finished_at' => 1750600000]);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['finished_at' => null]);

    $got = get_hc($hc['id'])['json'];
    assert_null(field($got, 'finished_at'), 'should be reopened');
    assert_same('2027-05-05', field($got, 'next_due'));
});

test('setting the date does not disturb finished_at', function () {
    $hc = create_hc(unique_site('update-date-only'));
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['finished_at' => 1750700000]);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['next_due' => '2027-06-06']);

    $got = get_hc($hc['id'])['json'];
    assert_same(1750700000, (int) ($got['finished_at'] ?? 0));
    assert_same('2027-06-06', field($got, 'next_due'));
});

test('an explicit null clears the date', function () {
    $hc = create_hc(unique_site('update-clear-null'), ['next_due' => '2027-07-07']);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['next_due' => null]);
    assert_null(field(get_hc($hc['id'])['json'], 'next_due'));
});

test('an empty string clears the date', function () {
    $hc = create_hc(unique_site('update-clear-empty'), ['next_due' => '2027-08-08']);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['next_due' => '']);
    assert_null(field(get_hc($hc['id'])['json'], 'next_due'));
});

test('an invalid update is rejected and leaves the existing date intact', function () {
    $hc = create_hc(unique_site('update-bad'), ['next_due' => '2027-09-09']);
    $r  = api('PUT', '/healthchecks/' . rawurlencode($hc['id']), ['next_due' => 'whenever']);
    assert_same(422, $r['status']);
    assert_same('2027-09-09', field(get_hc($hc['id'])['json'], 'next_due'), 'bad input must not clobber');
});

test('updating an unknown healthcheck is a 404', function () {
    $r = api('PUT', '/healthchecks/does-not-exist', ['next_due' => '2027-10-10']);
    assert_same(404, $r['status']);
});

// ── Listing + step regression ────────────────────────────────────────────────

group('server: listing and steps');

test('the list endpoint exposes next_due', function () {
    $site = unique_site('list-dates');
    create_hc($site, ['next_due' => '2027-11-11']);

    $r = api('GET', '/healthchecks?' . http_build_query(['site_key' => $site, 'limit' => 10]));
    assert_same(200, $r['status']);
    $rows = $r['json']['healthchecks'] ?? [];
    assert_same(1, count($rows));
    assert_same('2027-11-11', field($rows[0], 'next_due'));
});

test('step upsert and readback still work', function () {
    // Regression guard: insertHealthcheck gained a column, steps must be unaffected.
    $site = unique_site('steps');
    $hc   = create_hc($site, ['next_due' => '2027-12-12']);

    $r = api('PUT', '/healthchecks/' . rawurlencode($hc['id']) . '/steps/backup', [
        'status'        => 'done',
        'notes'         => 'Full backup taken',
        'reporting_url' => 'https://' . $site,
    ]);
    assert_same(200, $r['status']);

    $got   = get_hc($hc['id'])['json'];
    $steps = $got['steps'] ?? [];
    assert_same(1, count($steps));
    assert_same('backup', $steps[0]['step_id'] ?? null);
    assert_same('done', $steps[0]['status'] ?? null);
    assert_same('2027-12-12', field($got, 'next_due'), 'a step write must not disturb the date');
});

// ── Dashboard ────────────────────────────────────────────────────────────────

group('server: dashboard');

test('the dashboard requires the key', function () {
    $r = api('GET', '/dashboard', null, null);
    assert_contains('API key', $r['body'], 'should render the login form');
    assert_not_contains('All sites <span', $r['body'], 'must not render the site list');
});

test('the site list shows the scheduled date', function () {
    $site = unique_site('dash-scheduled');
    $due  = days_from_today(90);
    create_hc($site, ['next_due' => $due]);

    $row = row_containing(dash('/dashboard')['body'], $site);
    assert_contains($due, $row, 'the date should appear on this site row');
    assert_contains('due-ok', $row, 'a distant date is not urgent');
    assert_not_contains('overdue', $row);
});

test('a past date is flagged overdue', function () {
    $site = unique_site('dash-overdue');
    create_hc($site, ['next_due' => days_from_today(-10)]);

    $row = row_containing(dash('/dashboard')['body'], $site);
    assert_contains('due-overdue', $row);
    assert_contains('overdue', $row);
});

test('a date within a fortnight is flagged as soon', function () {
    $site = unique_site('dash-soon');
    create_hc($site, ['next_due' => days_from_today(5)]);

    $row = row_containing(dash('/dashboard')['body'], $site);
    assert_contains('due-soon', $row);
    assert_not_contains('overdue', $row);
});

test('a site with nothing scheduled shows a dash', function () {
    $site = unique_site('dash-none');
    create_hc($site);

    $row = row_containing(dash('/dashboard')['body'], $site);
    assert_contains('—', $row);
    assert_not_contains('due-ok', $row);
    assert_not_contains('due-overdue', $row);
});

test('the newest session wins — a stale date is not carried forward', function () {
    // The visit that was scheduled has since happened; the site should read as
    // "nothing scheduled", not as permanently overdue.
    $site = unique_site('dash-superseded');
    create_hc($site, ['next_due' => days_from_today(-30)]);   // older session
    create_hc($site);                                          // newer, no date

    $row = row_containing(dash('/dashboard')['body'], $site);
    assert_not_contains('overdue', $row, 'the completed visit must not still show as due');
    assert_not_contains(days_from_today(-30), $row);
    assert_contains('—', $row);
});

test('the per-site session table shows each session\'s date', function () {
    $site = unique_site('dash-site-detail');
    $due  = days_from_today(45);
    create_hc($site, ['next_due' => $due]);

    $body = dash('/dashboard?site=' . rawurlencode($site))['body'];
    assert_contains('<th>Next due</th>', $body);
    assert_contains($due, $body);
});

test('the session detail view shows the date', function () {
    $site = unique_site('dash-session-detail');
    $due  = days_from_today(60);
    $hc   = create_hc($site, ['next_due' => $due]);
    api('PUT', '/healthchecks/' . rawurlencode($hc['id']) . '/steps/backup', [
        'status'        => 'done',
        'notes'         => 'ok',
        'reporting_url' => 'https://' . $site,
    ]);

    $meta = session_meta(dash('/dashboard?site=' . rawurlencode($site) . '&hc=' . rawurlencode($hc['id']))['body']);
    assert_contains('Next due:', $meta);
    assert_contains($due, $meta);
    assert_contains('due-ok', $meta, 'a date two months out is not urgent');
});

test('a session with no date shows a dash in the detail view', function () {
    $site = unique_site('dash-session-nodate');
    $hc   = create_hc($site);
    $meta = session_meta(dash('/dashboard?site=' . rawurlencode($site) . '&hc=' . rawurlencode($hc['id']))['body']);
    assert_contains('Next due:', $meta);
    assert_contains('—', $meta);
    assert_not_contains('due-overdue', $meta);
    assert_not_contains('due-ok', $meta);
});

// ── Migrations ───────────────────────────────────────────────────────────────

group('server: migrations');

test('both migrations are recorded exactly once', function () {
    $pdo = new PDO('sqlite:' . $GLOBALS['att_hc_db_path'], null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
    $applied = $pdo->query('SELECT filename FROM migrations ORDER BY filename')->fetchAll(PDO::FETCH_COLUMN);
    assert_same(['0001_initial.sql', '0002_next_due.sql'], $applied);
});

test('the next_due column exists on healthchecks', function () {
    $pdo = new PDO('sqlite:' . $GLOBALS['att_hc_db_path'], null, null, [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]);
    $cols = array_column($pdo->query('PRAGMA table_info(healthchecks)')->fetchAll(PDO::FETCH_ASSOC), 'name');
    assert_true(in_array('next_due', $cols, true), 'columns: ' . implode(', ', $cols));
});