import { z } from "zod";

const configSchema = z.object({
  NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
  PORT: z.coerce.number().default(3000),
  HOST: z.string().default("0.0.0.0"),
  DATABASE_URL: z.string(),
  REDIS_URL: z.string().default("redis://localhost:6379"),
  SESSION_SECRET: z.string().min(32),
  ADMIN_EMAIL: z.string().email().optional(),
  ADMIN_PASSWORD: z.string().min(8).optional(),
  TMDB_API_KEY: z.string().optional(),
  PUBLIC_URL: z.string().url().default("http://localhost:3000"),
  /** Base URL shown on TV for /link (often admin UI). Falls back to PUBLIC_URL. */
  CLIENT_LINK_BASE_URL: z.string().url().optional(),
  PLAYBACK_IDLE_TIMEOUT_SECONDS: z.coerce.number().default(1200),
  PLAYBACK_ABSOLUTE_LIFETIME_SECONDS: z.coerce.number().default(43200),
  NODE_HEARTBEAT_INTERVAL_SECONDS: z.coerce.number().default(30),
  NODE_OFFLINE_THRESHOLD_SECONDS: z.coerce.number().default(90),
  HIDE_UNAVAILABLE_TITLES: z.coerce.boolean().default(true),
});

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

export function loadConfig(): Config {
  const result = configSchema.safeParse(process.env);
  if (!result.success) {
    console.error("Invalid configuration:", result.error.flatten().fieldErrors);
    process.exit(1);
  }
  return result.data;
}