import { env } from 'node:process';

function req(name: string, fallback?: string): string {
    const v = env[name] ?? fallback;
    if (v === undefined) throw new Error(`missing env: ${name}`);
    return v;
}

function num(name: string, fallback: number): number {
    const raw = env[name];
    if (!raw) return fallback;
    const n = Number(raw);
    if (!Number.isFinite(n)) throw new Error(`env ${name}=${raw} is not a number`);
    return n;
}

export const config = {
    serversRoot: req('SERVERS_ROOT', '/root/zombies/t5'),
    relDest: req('REL_DEST', 'runtime/plutonium/storage/t5/raw/scripts/sp'),
    // Per-kind destination sub-paths under each server's directory. `relDest`
    // above stays as the script fallback so existing deploys keep working.
    relDestScript: env.REL_DEST_SCRIPT ?? env.REL_DEST ?? 'runtime/plutonium/storage/t5/raw/scripts/sp',
    relDestConfig: env.REL_DEST_CONFIG ?? 'configs',
    relDestPlugin: env.REL_DEST_PLUGIN ?? 'runtime/plutonium/plugins',
    // Filename the baseline+overlays compose into. Same for every scope today.
    configTargetFile: env.CONFIG_TARGET_FILE ?? 'dedicated_sp.cfg',
    // Where on-disk copies of active beta files live for operator visibility.
    // Cleared per-beta on promote/rollback.
    betaArchiveDir: req('BETA_ARCHIVE_DIR', '/root/zombies/beta-archive'),
    dbPath: req('DB_PATH', './data/cherry.db'),
    deployKeepDays: num('DEPLOY_KEEP_DAYS', 7),
    httpTimeoutMs: num('HTTP_TIMEOUT_MS', 10_000),
    komodo: {
        address: env.KOMODO_ADDRESS ?? '',
        apiKey: env.KOMODO_API_KEY ?? '',
        apiSecret: env.KOMODO_API_SECRET ?? ''
    },
    rcon: {
        // Host every RCON packet is sent to. Defaults to the Docker
        // host-gateway alias so the electric-cherry container can reach
        // Plutonium servers running on the same host without knowing each
        // container's internal IP.
        host: env.RCON_HOST ?? 'host.docker.internal',
        // Shared across the fleet — every server uses the same rcon_password.
        password: env.RCON_PASSWORD ?? '',
        timeoutMs: num('RCON_TIMEOUT_MS', 3_000)
    }
} as const;

export function komodoConfigured(): boolean {
    return !!(config.komodo.address && config.komodo.apiKey && config.komodo.apiSecret);
}

export function rconConfigured(): boolean {
    return !!config.rcon.password;
}

export type ArtifactKind = 'script' | 'config' | 'plugin' | 'baseline';

export function relDestForKind(kind: ArtifactKind): string {
    switch (kind) {
        case 'script': return config.relDestScript;
        case 'config': return config.relDestConfig;
        case 'baseline': return config.relDestConfig;
        case 'plugin': return config.relDestPlugin;
    }
}

export const destOfKind = (server: string, kind: ArtifactKind) =>
    `${config.serversRoot}/${server}/${relDestForKind(kind)}`;

// Back-compat: existing call sites written before the multi-kind refactor
// resolve to the script destination.
export const destOf = (server: string) => destOfKind(server, 'script');
export const betaArchiveOf = (betaId: number) => `${config.betaArchiveDir}/beta-${betaId}`;