import path from "node:path";
import fs from "node:fs";
import { fileURLToPath } from "node:url";

const here = path.dirname(fileURLToPath(import.meta.url));
const rootDir = path.resolve(here, "..", "..");

export interface AppConfig {
  port: number;
  host: string;
  dataDir: string;
  mediaDir: string;
  originalsDir: string;
  derivedDir: string;
  dbPath: string;
  sessionSecret: string | null;
  runcomfyApiKey: string | null;
  runcomfyBaseUrl: string;
  runcomfyModelId: string;
  groqApiKey: string | null;
  groqModel: string;
  groqTunerModel: string;
  groqBaseUrl: string;
  baseApiToken: string | null;
  baseApiUrl: string;
  env: "development" | "test" | "production";
  maxUploadBytes: number;
}

export function loadConfig(overrides: Partial<AppConfig> = {}): AppConfig {
  const envFile = path.join(rootDir, ".env");
  const testing = overrides.env === "test" || process.env.VILMAL_ENV === "test" || process.env.NODE_ENV === "test";
  if (!testing && fs.existsSync(envFile)) process.loadEnvFile(envFile);
  const env = (process.env.VILMAL_ENV ?? process.env.NODE_ENV ?? "development") as AppConfig["env"];
  const dataDir = path.resolve(rootDir, process.env.VILMAL_DATA_DIR ?? "./data");
  const mediaDir = path.join(dataDir, "media");
  return {
    port: Number(process.env.VILMAL_PORT ?? 8788),
    host: process.env.VILMAL_HOST ?? "127.0.0.1",
    dataDir,
    mediaDir,
    originalsDir: path.join(mediaDir, "originals"),
    derivedDir: path.join(mediaDir, "derived"),
    dbPath: path.join(dataDir, "vilmal.db"),
    sessionSecret: testing ? null : process.env.VILMAL_SESSION_SECRET ?? null,
    runcomfyApiKey: testing ? null : process.env.RUNCOMFY_API_KEY ?? null,
    runcomfyBaseUrl: process.env.RUNCOMFY_BASE_URL || "https://model-api.runcomfy.net",
    runcomfyModelId: process.env.RUNCOMFY_MODEL_ID || "google/nano-banana/pro/edit",
    groqApiKey: testing ? null : process.env.GROQ_API_KEY ?? null,
    groqModel: process.env.VILMAL_GROQ_MODEL || "meta-llama/llama-4-scout-17b-16e-instruct",
    groqTunerModel: process.env.VILMAL_GROQ_TUNER_MODEL || "openai/gpt-oss-120b",
    groqBaseUrl: process.env.VILMAL_GROQ_BASE_URL || "https://api.groq.com/openai/v1",
    baseApiToken: testing ? null : process.env.BASELINKER_API_TOKEN ?? null,
    baseApiUrl: process.env.VILMAL_BASE_API_URL || "https://api.baselinker.com/connector.php",
    env,
    maxUploadBytes: 25 * 1024 * 1024,
    ...overrides,
  };
}

export { rootDir };