<?php
declare(strict_types=1);

if (PHP_SAPI !== 'cli') {
    http_response_code(404);
    exit;
}

require_once __DIR__ . '/../config/bootstrap.php';

function apply_existing_database_upgrades(PDO $pdo): void
{
    $pdo->exec("CREATE TABLE IF NOT EXISTS jobcard_status_history (id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY, jobcard_id BIGINT UNSIGNED NOT NULL, from_status VARCHAR(60) NOT NULL, to_status VARCHAR(60) NOT NULL, changed_by BIGINT UNSIGNED NULL, changed_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY (jobcard_id) REFERENCES jobcards(id) ON DELETE CASCADE, FOREIGN KEY (changed_by) REFERENCES users(id) ON DELETE SET NULL, INDEX status_history_jobcard_idx (jobcard_id, changed_at)) ENGINE=InnoDB");
    $pdo->exec("CREATE TABLE IF NOT EXISTS jobcard_sequences (sequence_year SMALLINT UNSIGNED PRIMARY KEY, next_sequence INT UNSIGNED NOT NULL) ENGINE=InnoDB");
    $index = $pdo->query("SHOW INDEX FROM sla_agreements WHERE Key_name = 'sla_client_unique'")->fetch();
    if (!$index) {
        $duplicates = (int)$pdo->query('SELECT COUNT(*) FROM (SELECT client_id FROM sla_agreements GROUP BY client_id HAVING COUNT(*) > 1) duplicate_clients')->fetchColumn();
        if ($duplicates > 0) throw new RuntimeException('Multiple SLA agreements exist for one or more clients; resolve duplicates before rerunning the installer.');
        $pdo->exec('ALTER TABLE sla_agreements ADD UNIQUE KEY sla_client_unique (client_id)');
    }
}

try {
    $schemaPath = __DIR__ . '/../database/schema.sql';
    if (!is_readable($schemaPath)) throw new RuntimeException('database/schema.sql is missing or unreadable');
    $schema = file_get_contents($schemaPath);
    if ($schema === false || trim($schema) === '') throw new RuntimeException('database/schema.sql could not be read');
    db()->exec($schema);
    apply_existing_database_upgrades(db());
    ensure_initial_administrator();
    fwrite(STDOUT, "Database schema installed and initial Administrator verified.\n");
} catch (Throwable $exception) {
    fwrite(STDERR, "Installation failed: {$exception->getMessage()}\n");
    exit(1);
}