export function loadConfig(env = process.env) {
    const serverName = requireEnv(env, "SERVER_NAME");
    const databases = parseList(env.DATABASES);
    const defaultDatabase = (env.DATABASE_NAME?.trim() || databases[0] || "").trim();
    if (!defaultDatabase) {
        throw new Error("DATABASE_NAME or DATABASES must be configured.");
    }
    const allowedDatabases = mergeUnique([defaultDatabase, ...databases]);
    return {
        serverName,
        defaultDatabase,
        allowedDatabases,
        user: optional(env.DB_USER),
        password: optional(env.DB_PASSWORD),
        readOnly: parseBoolean(env.READONLY, false),
        enableDdl: parseBoolean(env.ENABLE_DDL, false),
        encrypt: parseBoolean(env.DB_ENCRYPT ?? env.ENCRYPT, false),
        trustServerCertificate: parseBoolean(env.TRUST_SERVER_CERTIFICATE, false),
        connectionTimeoutMs: parsePositiveInt(env.CONNECTION_TIMEOUT, 30) * 1000,
        requestTimeoutMs: parsePositiveInt(env.QUERY_TIMEOUT_MS, 30000),
        maxRows: parsePositiveInt(env.MAX_ROWS, 1000),
        maxWriteRows: parsePositiveInt(env.MAX_WRITE_ROWS, 100)
    };
}
function requireEnv(env, name) {
    const value = env[name]?.trim();
    if (!value) {
        throw new Error(`${name} must be configured.`);
    }
    return value;
}
function optional(value) {
    const trimmed = value?.trim();
    return trimmed ? trimmed : undefined;
}
function parseList(value) {
    return (value ?? "")
        .split(",")
        .map((item) => item.trim())
        .filter(Boolean);
}
function parseBoolean(value, fallback) {
    if (value === undefined || value.trim() === "") {
        return fallback;
    }
    return ["1", "true", "yes", "y", "on"].includes(value.trim().toLowerCase());
}
function parsePositiveInt(value, fallback) {
    if (value === undefined || value.trim() === "") {
        return fallback;
    }
    const parsed = Number.parseInt(value, 10);
    if (!Number.isFinite(parsed) || parsed <= 0) {
        throw new Error(`Expected a positive integer but received '${value}'.`);
    }
    return parsed;
}
function mergeUnique(values) {
    const seen = new Set();
    const result = [];
    for (const value of values) {
        const key = value.toLowerCase();
        if (!seen.has(key)) {
            seen.add(key);
            result.push(value);
        }
    }
    return result;
}
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