import path from "node:path";
import fs from "node:fs";

/** Minimal .env loader (no dependency). Does not override already-set variables. */
export function loadDotEnv(cwd = process.cwd()): void {
  const file = path.join(cwd, ".env");
  if (!fs.existsSync(file)) return;
  for (const line of fs.readFileSync(file, "utf8").split("\n")) {
    const m = line.match(/^\s*([A-Z0-9_]+)\s*=\s*(.*)\s*$/i);
    if (!m) continue;
    const key = m[1]!;
    let val = m[2]!;
    if ((val.startsWith('"') && val.endsWith('"')) || (val.startsWith("'") && val.endsWith("'"))) val = val.slice(1, -1);
    if (process.env[key] === undefined) process.env[key] = val;
  }
}

export interface AppConfig {
  dataDir: string;
  profilesDir: string;
  sessionsDir: string;
  platformModelDir: string;
  mediaDir: string;
  databaseUrl?: string;
  headless: boolean;
  browserChannel: string;
  llmProvider: "none" | "anthropic" | "local";
  llmModel: string;
  localLlmUrl?: string;
  localLlmKey?: string;
  localLlmModel?: string;
  dashboardPort: number;
}

export function loadConfig(): AppConfig {
  loadDotEnv();
  const dataDir = path.resolve(process.env.SRC_DATA_DIR ?? "./data");
  const cfg: AppConfig = {
    dataDir,
    profilesDir: path.join(dataDir, "browser_profiles"),
    sessionsDir: path.join(dataDir, "sessions"),
    platformModelDir: path.join(dataDir, "platform_model"),
    mediaDir: path.join(dataDir, "media"),
    databaseUrl: process.env.SRC_DATABASE_URL || undefined,
    headless: /^(1|true|yes)$/i.test(process.env.SRC_HEADLESS ?? "false"),
    browserChannel: process.env.SRC_BROWSER_CHANNEL ?? "chromium",
    llmProvider: (process.env.SRC_LLM_PROVIDER as AppConfig["llmProvider"]) ?? "none",
    llmModel: process.env.SRC_LLM_MODEL ?? "claude-opus-5",
    localLlmUrl: process.env.SRC_LOCAL_LLM_URL,
    localLlmKey: process.env.SRC_LOCAL_LLM_KEY,
    localLlmModel: process.env.SRC_LOCAL_LLM_MODEL,
    dashboardPort: Number(process.env.SRC_DASHBOARD_PORT ?? 8340),
  };
  for (const d of [cfg.profilesDir, cfg.sessionsDir, cfg.platformModelDir, cfg.mediaDir]) fs.mkdirSync(d, { recursive: true });
  return cfg;
}