if (process.env.NODE_ENV !== "test")
    require("server-only");
import pg from "pg";

const { Pool } = pg;

declare global {
    // eslint-disable-next-line no-var
    var __fiddyPool: pg.Pool | undefined;
}

export default function getPool() {
    if (!process.env.DATABASE_URL)
        throw new Error("DATABASE_URL is required");
    const dbName = (() => {
        try {
            const url = new URL(process.env.DATABASE_URL!);
            const name = url.pathname.replace(/^\/+/, "");
            return name ? decodeURIComponent(name) : "";
        } catch {
            return "";
        }
    })();
    const allowedRaw = process.env.ALLOWED_DB_NAMES;
    const allowed = allowedRaw
        ? allowedRaw
            .split(",")
            .map(value => value.trim().toLowerCase())
            .filter(Boolean)
        : (process.env.NODE_ENV === "test" && dbName ? [dbName.toLowerCase()] : []);
    if (!allowed.length)
        throw new Error("ALLOWED_DB_NAMES must include at least one database name");
    if (!dbName)
        throw new Error("DATABASE_URL must include a database name");
    if (!allowed.includes(dbName.toLowerCase()))
        throw new Error(`DATABASE_URL must target an allowed database. Found "${dbName}"`);
    if (!globalThis.__fiddyPool) {
        globalThis.__fiddyPool = new Pool({
            connectionString: process.env.DATABASE_URL,
            ssl: process.env.DATABASE_SSL === "false" ? false : { rejectUnauthorized: false },
            allowExitOnIdle: process.env.NODE_ENV === "test"
        });
    }
    return globalThis.__fiddyPool;
}