import path from "node:path";

interface AppConfig {
  openAiApiKey: string;
  openAiBaseUrl: string;
  openAiImageModel: string;
  openAiTimeoutMs: number;
  databasePath: string;
  generatedImagesPath: string;
  adminUsername: string;
  adminPassword: string;
  adminSyncOnBoot: boolean;
  defaultMonthlyQuota: number;
  sessionDays: number;
}

function parseInteger(value: unknown, fallbackValue: number): number {
  const numericValue = Number.parseInt(String(value ?? ""), 10);

  if (Number.isFinite(numericValue)) {
    return numericValue;
  }

  return fallbackValue;
}

function parseBoolean(value: unknown, fallbackValue: boolean): boolean {
  if (value === undefined || value === null || value === "") {
    return fallbackValue;
  }

  const normalizedValue = String(value).trim().toLowerCase();

  if (["1", "true", "yes", "on"].includes(normalizedValue)) {
    return true;
  }

  if (["0", "false", "no", "off"].includes(normalizedValue)) {
    return false;
  }

  return fallbackValue;
}

function resolveDatabasePath(rawPath?: string): string {
  if (!rawPath) {
    return path.join(
      /* turbopackIgnore: true */ process.cwd(),
      "data",
      "image-prompt-studio.db",
    );
  }

  if (path.isAbsolute(rawPath)) {
    return rawPath;
  }

  return path.resolve(/* turbopackIgnore: true */ process.cwd(), rawPath);
}

function resolveGeneratedImagesPath(
  databasePath: string,
  rawPath?: string,
): string {
  if (!rawPath) {
    return path.join(path.dirname(databasePath), "generated-images");
  }

  if (path.isAbsolute(rawPath)) {
    return rawPath;
  }

  return path.resolve(/* turbopackIgnore: true */ process.cwd(), rawPath);
}

const databasePath = resolveDatabasePath(process.env.DATABASE_PATH);

export const appConfig: AppConfig = {
  openAiApiKey: process.env.OPENAI_API_KEY ?? "",
  openAiBaseUrl: process.env.OPENAI_BASE_URL ?? "https://api.openai.com/v1",
  openAiImageModel: process.env.OPENAI_IMAGE_MODEL ?? "gpt-image-2",
  openAiTimeoutMs: parseInteger(process.env.OPENAI_TIMEOUT_MS, 140000),
  databasePath,
  generatedImagesPath: resolveGeneratedImagesPath(
    databasePath,
    process.env.GENERATED_IMAGES_PATH,
  ),
  adminUsername: String(process.env.ADMIN_USERNAME ?? "admin")
    .trim()
    .toLowerCase(),
  adminPassword: String(process.env.ADMIN_PASSWORD ?? "change-me-now"),
  adminSyncOnBoot: parseBoolean(process.env.ADMIN_SYNC_ON_BOOT, true),
  defaultMonthlyQuota: parseInteger(process.env.DEFAULT_MONTHLY_QUOTA, 20),
  sessionDays: parseInteger(process.env.SESSION_DAYS, 30),
};