#!/usr/bin/env php
<?php

declare(strict_types=1);

/**
 * One-time migration: encrypted SQLite file -> MySQL database.
 *
 * Usage:
 *   php cli/migrate_sqlite_to_mysql.php
 *
 * Requires QDB_MASTER_KEY (source SQLite) and QDB_MYSQL_* variables (target).
 */

require_once __DIR__ . '/../common.php';
qdb_env_override('QDB_DRIVER', 'sqlite');
require_once __DIR__ . '/../db_init.php';

if (!is_file(QDB_PATH)) {
    fwrite(STDERR, "SQLite database file not found at " . QDB_PATH . PHP_EOL);
    exit(1);
}

[$sqlitePdo, $tmpDb, $lockFp] = qdb_open(false);

$tables = $sqlitePdo->query(
    "SELECT name FROM sqlite_master WHERE type = 'table' AND name NOT LIKE 'sqlite_%' ORDER BY name"
)->fetchAll(PDO::FETCH_COLUMN);

$tableData = [];
foreach ($tables as $table) {
    $tableData[$table] = $sqlitePdo->query("SELECT * FROM `{$table}`")->fetchAll(PDO::FETCH_ASSOC);
}
qdb_discard($tmpDb, $lockFp);

qdb_reset_driver_cache();
qdb_env_override('QDB_DRIVER', 'mysql');

[$mysqlPdo] = qdb_mysql_open();
qdb_mysql_ensure_ready($mysqlPdo);

qdb_set_foreign_keys($mysqlPdo, false);
$mysqlPdo->beginTransaction();

try {
    foreach ($tableData as $table => $rows) {
        if (!qdb_table_exists($mysqlPdo, $table)) {
            throw new RuntimeException("MySQL schema is missing source table: {$table}");
        }
        $mysqlPdo->exec("DELETE FROM `{$table}`");
        if (!$rows) {
            echo "{$table}: 0 rows\n";
            continue;
        }
        $columns = array_keys($rows[0]);
        $colList = implode(', ', array_map(fn($c) => "`{$c}`", $columns));
        $placeholders = implode(', ', array_map(fn($c) => ':' . $c, $columns));
        $insert = $mysqlPdo->prepare("INSERT INTO `{$table}` ({$colList}) VALUES ({$placeholders})");
        foreach ($rows as $row) {
            $params = [];
            foreach ($columns as $column) {
                $params[':' . $column] = $row[$column];
            }
            $insert->execute($params);
        }
        echo "{$table}: " . count($rows) . " rows\n";
    }
    $mysqlPdo->commit();
} catch (Throwable $e) {
    if ($mysqlPdo->inTransaction()) {
        $mysqlPdo->rollBack();
    }
    throw $e;
} finally {
    qdb_set_foreign_keys($mysqlPdo, true);
}

qdb_set_schema_version($mysqlPdo, QDB_VERSION);

echo "Migration complete. Set QDB_DRIVER=mysql in .env and restart PHP.\n";