import { z } from 'zod';

const ConfigSchema = z.object({
  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
  PORT: z.coerce.number().int().positive().default(3000),
  HOST: z.string().default('0.0.0.0'),
  DATABASE_URL: z.string().url(),
  LLAMA_SWAP_URL: z.string().url(),
  PROJECT_ROOT_WHITELIST: z.string().default('/opt'),
  BOOTSTRAP_ROOT: z.string().default('/opt/projects'),
  DEFAULT_MODEL: z.string().default('qwen3.6-35b-a3b-mxfp4'),
  LOG_LEVEL: z.string().default('info'),
  // v1.11.8: SearXNG JSON endpoint for web_search / web_fetch tools.
  // Defaults to the internal Tailscale Fathom URL (bypasses Authelia).
  // The public search.indifferentketchup.com URL would 302 to auth and
  // is unusable from the server context — keep the internal one.
  SEARXNG_URL: z.string().url().default('http://100.114.205.53:8888'),
  GITEA_BASE_URL: z.string().url().default('https://git.indifferentketchup.com'),
  GITEA_USER: z.string().default('indifferentketchup'),
  GITEA_TOKEN: z.string().optional(),
  GITEA_SSH_HOST: z.string().default('100.114.205.53:2222'),
  // v1.15.0-mcp-multi: path to the MCP config JSON file. Default /data/mcp.json
  // (bind-mounted alongside AGENTS.md). File missing = no MCP (opt-in).
  MCP_CONFIG_PATH: z.string().optional(),
  // v2.0.5: cheaper model for titles, summaries, labeling. Falls back to
  // session model (auto_name) or DEFAULT_MODEL when unset.
  FAST_MODEL: z.string().optional(),
});

export type Config = z.infer<typeof ConfigSchema>;

let cached: Config | null = null;

export function loadConfig(): Config {
  if (cached) return cached;
  const parsed = ConfigSchema.safeParse(process.env);
  if (!parsed.success) {
    console.error('Invalid environment configuration:');
    console.error(parsed.error.flatten().fieldErrors);
    process.exit(1);
  }
  cached = parsed.data;
  return cached;
}