<?php

declare(strict_types=1);

require __DIR__ . '/dev-db.php';

function m3_check_assert(string $label, bool $condition, array &$failures, int &$passes): void
{
    if ($condition) {
        $passes++;
        echo "PASS {$label}\n";
        return;
    }

    $failures[] = $label;
    echo "FAIL {$label}\n";
}

$pdo = dev_pdo();
dev_apply_schema($pdo);

$tenantSlug = getenv('M3_DEFAULT_TENANT_SLUG');
$tenantSlug = $tenantSlug !== false && trim($tenantSlug) !== '' ? trim($tenantSlug) : 'default';

$failures = [];
$passes = 0;

$stmt = $pdo->prepare('SELECT * FROM tenants WHERE slug = ?');
$stmt->execute([$tenantSlug]);
$tenants = $stmt->fetchAll();

m3_check_assert('default tenant exists exactly once', count($tenants) === 1, $failures, $passes);
if (count($tenants) !== 1) {
    echo "\nM3 SaaS basis check failed: tenant '{$tenantSlug}' is missing or duplicated.\n";
    exit(1);
}

$tenantId = (int)$tenants[0]['id'];

$legacyMemberCount = (int)$pdo->query('SELECT COUNT(*) FROM kl_Mitarbeiter')->fetchColumn();

$stmt = $pdo->prepare('SELECT COUNT(*) FROM tenant_settings WHERE tenant_id = ?');
$stmt->execute([$tenantId]);
m3_check_assert('tenant settings exist exactly once', (int)$stmt->fetchColumn() === 1, $failures, $passes);

$stmt = $pdo->prepare('SELECT COUNT(*) FROM participants WHERE tenant_id = ?');
$stmt->execute([$tenantId]);
m3_check_assert('participant count matches legacy members', (int)$stmt->fetchColumn() === $legacyMemberCount, $failures, $passes);

$stmt = $pdo->prepare(
    'SELECT COUNT(DISTINCT legacy_mitarbeiter_id)
     FROM participants
     WHERE tenant_id = ?
       AND legacy_mitarbeiter_id IS NOT NULL'
);
$stmt->execute([$tenantId]);
m3_check_assert('legacy member ids are mapped one-to-one', (int)$stmt->fetchColumn() === $legacyMemberCount, $failures, $passes);

$stmt = $pdo->prepare(
    'SELECT COUNT(*)
     FROM kl_Mitarbeiter m
     LEFT JOIN participants p
       ON p.tenant_id = ?
      AND p.legacy_mitarbeiter_id = m.MitarbeiterID
     WHERE p.id IS NULL'
);
$stmt->execute([$tenantId]);
m3_check_assert('no legacy member is missing a participant', (int)$stmt->fetchColumn() === 0, $failures, $passes);

$stmt = $pdo->prepare(
    'SELECT COUNT(*)
     FROM kl_Mitarbeiter m
     LEFT JOIN users u
       ON u.email_norm = LOWER(TRIM(m.Email))
     LEFT JOIN tenant_memberships tm
       ON tm.tenant_id = ?
      AND tm.user_id = u.id
     WHERE m.aktiv = 1
       AND m.admin = 1
       AND (tm.id IS NULL OR tm.role NOT IN (\'admin\', \'owner\'))'
);
$stmt->execute([$tenantId]);
m3_check_assert('active legacy admins have tenant memberships', (int)$stmt->fetchColumn() === 0, $failures, $passes);

$stmt = $pdo->prepare(
    'SELECT COUNT(*)
     FROM kl_Mitarbeiter m
     JOIN users u
       ON u.email_norm = LOWER(TRIM(m.Email))
     JOIN tenant_memberships tm
       ON tm.tenant_id = ?
      AND tm.user_id = u.id
     JOIN participants p
       ON p.tenant_id = tm.tenant_id
      AND p.legacy_mitarbeiter_id = m.MitarbeiterID
     WHERE m.aktiv = 1
       AND m.admin = 1
       AND p.user_id <> u.id'
);
$stmt->execute([$tenantId]);
m3_check_assert('admin participants link to their login users', (int)$stmt->fetchColumn() === 0, $failures, $passes);

if ($failures !== []) {
    echo "\nM3 SaaS basis check failed with " . count($failures) . " failure(s):\n";
    foreach ($failures as $failure) {
        echo "- {$failure}\n";
    }
    exit(1);
}

echo "\nM3 SaaS basis check passed with {$passes} assertions.\n";