import { z } from "zod";

const LogLevel = z.enum(["fatal", "error", "warn", "info", "debug", "trace", "silent"]);

export const ConfigSchema = z.object({
  NODE_ENV: z.enum(["development", "test", "production"]).default("development"),
  PORT: z.coerce.number().int().min(1).max(65535).default(4380),
  DATABASE_URL: z.string().regex(/^postgres(ql)?:\/\//, "必须是 postgres:// 连接串"),
  SECRET_MASTER_KEY: z.string().min(16, "SECRET_MASTER_KEY 至少 16 个字符"),
  LOG_LEVEL: LogLevel.default("info"),
  /** 仅开发模式生效的管理员 Key */
  DEV_ADMIN_KEY: z.string().min(8).optional(),
  /** worker 心跳间隔 */
  WORKER_HEARTBEAT_MS: z.coerce.number().int().min(1000).default(30_000),
});
export type Config = z.infer<typeof ConfigSchema>;

/** 从环境变量加载并校验配置;失败时抛出可读错误(不含变量值) */
export function loadConfig(env: NodeJS.ProcessEnv = process.env): Config {
  const parsed = ConfigSchema.safeParse(env);
  if (!parsed.success) {
    const lines = parsed.error.issues.map((i) => `  ${i.path.join(".")}: ${i.message}`);
    throw new Error(`配置无效:\n${lines.join("\n")}`);
  }
  return parsed.data;
}

export const isDev = (c: Pick<Config, "NODE_ENV">) => c.NODE_ENV !== "production";