<?php

/**
 * Contract test: every column that the code expects to find in the
 * `users` table must exist. Catches the production failure mode
 * where a migration was added to code but never run on the database
 * (e.g. "Unknown column 'invoice_email' in 'SELECT'" — TRU-77).
 *
 * This test runs against the test database (configured in
 * phpunit.xml / Pest configuration). It does NOT run against
 * production — that's covered by the `/admin/schema-check` HTTP
 * endpoint in `adminRoute.php` which the deploy pipeline hits.
 */

app_require('classes/customer_invoice_email_schema_bootstrap.php');

use classes\customer_invoice_email_schema_bootstrap;

const REQUIRED_USERS_COLUMNS = [
    // TRU-77 (added 2026-08-16) — the column that was missing in
    // production after the migration was merged to master.
    'invoice_email',
    // Older required columns that the code references.
    'wash_certificate_email',
    'email',
    'customer_number',
    'phone_country_code',
    'phone',
    'group_id',
    'created_at',
];

/**
 * The unit test bootstrap does not create a $db global. This contract
 * test is unique in that it needs a real database to verify schema
 * state, so wire one up here using the same CONFIG_DB_* env vars the
 * rest of the CI suite exports. If the database is unavailable, the
 * tests below will fail with a clear "no_db_connection" error.
 */
schema_health_check_test_wire_db();

function schema_health_check_test_wire_db(): void
{
    if (isset($GLOBALS['db']) && is_object($GLOBALS['db'])) {
        return;
    }
    if (!class_exists('mysqli')) {
        return;
    }

    $host = (string)(getenv('CONFIG_DB_HOST') ?: 'mysql-debug');
    $user = (string)(getenv('CONFIG_DB_USER') ?: 'root');
    $password = (string)(getenv('CONFIG_DB_PASSWORD') ?: 'debug_root_password');
    $database = (string)(getenv('CONFIG_DB_DATABASE') ?: 'nnks_db_debug');
    $port = (int)(getenv('CONFIG_DB_PORT') ?: 3306);

    try {
        mysqli_report(MYSQLI_REPORT_OFF);
        $conn = new mysqli($host, $user, $password, $database, $port);
        if ($conn->connect_errno) {
            return;
        }
        $conn->set_charset('utf8mb4');
    } catch (\Throwable $e) {
        return;
    }

    $GLOBALS['db'] = new class($conn) {
        private mysqli $conn;

        public function __construct(mysqli $conn)
        {
            $this->conn = $conn;
        }

        public function query(string $sql)
        {
            return $this->conn->query($sql);
        }

        public function fetch_assoc($result)
        {
            return $result ? $result->fetch_assoc() : null;
        }

        public function close(): void
        {
            try {
                $this->conn->close();
            } catch (\Throwable) {
            }
        }
    };
}

/**
 * The unit suite starts with a freshly-dropped `nnks_db_debug` database
 * (see run_ci_suite::reset_ci_state). The schema bootstrap only owns
 * the `users` table; `invoices` and `bookings` are managed by other
 * migrations that don't run in the unit suite. Create the bare-minimum
 * schema that adminRoute::runSchemaCheck needs so the third test can
 * verify the "all columns exist" happy path.
 */
function schema_health_check_test_ensure_aux_tables(): void
{
    global $db;
    if (!isset($db) || !is_object($db) || !method_exists($db, 'query')) {
        return;
    }

    $create = function (string $table, string $createSql, array $requiredColumns) use ($db): void {
        $r = $db->query("SHOW TABLES LIKE '{$table}'");
        if (!$r || (int)$r->num_rows === 0) {
            $db->query($createSql);
            return;
        }
        foreach ($requiredColumns as $column => $definition) {
            $r = $db->query("SHOW COLUMNS FROM `{$table}` LIKE '{$column}'");
            if (!$r || (int)$r->num_rows === 0) {
                $db->query("ALTER TABLE `{$table}` ADD COLUMN `{$column}` {$definition}");
            }
        }
    };

    $create('invoices', "CREATE TABLE `invoices` (
        id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
        customer_number INT NOT NULL DEFAULT 0,
        po_number VARCHAR(64) NULL,
        closed_at DATETIME NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci", [
        'po_number' => 'VARCHAR(64) NULL',
        'closed_at' => 'DATETIME NULL',
        'customer_number' => 'INT NOT NULL DEFAULT 0',
    ]);

    $create('bookings', "CREATE TABLE `bookings` (
        id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
        customer_number INT NOT NULL DEFAULT 0,
        department INT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci", [
        'customer_number' => 'INT NOT NULL DEFAULT 0',
        'department' => 'INT NULL',
    ]);
}

beforeEach(function () {
    // Force a fresh real DB connection. Earlier unit tests in the
    // same process may have left $GLOBALS['db'] as a Mockery mock,
    // which would cause the schema bootstrap below to silently no-op
    // and leave the `users` table uncreated. The wiring helper
    // short-circuits when a $db is already set, so we unset first.
    unset($GLOBALS['db']);
    schema_health_check_test_wire_db();

    if (class_exists(customer_invoice_email_schema_bootstrap::class)) {
        // Reset the bootstrap's static `$initialized` cache. A
        // previous test (possibly against a mock $db) may have set
        // it to true, which would cause ensureSchema() to skip
        // creating the `users` table on our real connection.
        $bootstrapRef = new ReflectionClass(customer_invoice_email_schema_bootstrap::class);
        $initProp = $bootstrapRef->getProperty('initialized');
        $initProp->setAccessible(true);
        $initProp->setValue(null, false);

        // Self-heal: run the schema bootstrap so the test DB has all
        // the columns the contract requires. The bootstrap is additive
        // and idempotent — safe to run on every test.
        customer_invoice_email_schema_bootstrap::ensureSchema();
    }
    schema_health_check_test_ensure_aux_tables();
});

it('users table has every required column the code references', function () {
    global $db;
    expect($db)->toBeObject();
    expect(method_exists($db, 'query'))->toBeTrue();

    $missing = [];
    foreach (REQUIRED_USERS_COLUMNS as $column) {
        $safeColumn = str_replace("'", '', $column);
        $result = $db->query("SHOW COLUMNS FROM `users` LIKE '{$safeColumn}'");
        if (!$result || (int)$result->num_rows === 0) {
            $missing[] = $column;
        }
    }
    expect($missing)->toBe(
        [],
        "users table is missing required columns: " . implode(', ', $missing)
            . ". Did the migration run? See customer_invoice_email_schema_bootstrap."
    );
});

it('invoice_email column accepts a normal email address', function () {
    global $db;
    // Insert a throwaway user with an invoice_email, read it back.
    // If the column doesn't exist or the type is wrong, this fails.
    $email = 'test-invoice-' . uniqid() . '@example.com';
    $customerNumber = 99900000 + random_int(1, 99999);
    $db->query("INSERT INTO `users` (customer_number, display_name, email, invoice_email) VALUES ({$customerNumber}, 'Contract Test', '{$email}', 'invoice@example.com')");

    $result = $db->query("SELECT invoice_email FROM `users` WHERE customer_number = {$customerNumber}");
    expect($result)->toBeObject();
    $row = $result->fetch_assoc();
    expect($row['invoice_email'] ?? null)->toBe('invoice@example.com');

    // Cleanup
    $db->query("DELETE FROM `users` WHERE customer_number = {$customerNumber}");
});

it('admin schema-check endpoint reports ok=true when all columns exist', function () {
    $admin = new \routes\adminRoute();
    $reflection = new ReflectionClass($admin);
    $method = $reflection->getMethod('runSchemaCheck');
    $method->setAccessible(true);
    $report = $method->invoke($admin);
    expect($report['ok'])->toBeTrue(
        'schema check failed: ' . json_encode($report['missing'] ?? [])
    );
    expect($report['columns_checked'])->toBeGreaterThan(0);
});