/** Format raw DB / API errors into a brief in-app dialog payload. */

export type NotifyKind = "error" | "warning" | "info" | "success";

export type NotifyPayload = {
  id: string;
  kind: NotifyKind;
  title: string;
  message: string;
  detail?: string;
  tips?: string[];
  /** auto-dismiss ms for toast mode; modal stays until closed */
  mode: "modal" | "toast";
  durationMs?: number;
};

type Parsed = {
  kind: NotifyKind;
  title: string;
  message: string;
  detail?: string;
  tips?: string[];
};

export function formatDbError(raw: unknown): Parsed {
  const text = raw instanceof Error ? raw.message : String(raw ?? "未知错误");
  const lower = text.toLowerCase();

  // MySQL / MariaDB Access denied
  if (/error\s*1045|access denied for user/i.test(text)) {
    const noPassword = /using password:\s*NO/i.test(text);
    return {
      kind: "error",
      title: "认证失败",
      message: noPassword ? "未填密码，服务器拒绝空密码登录。" : "用户名或密码错误，或主机无权访问。",
      detail: text,
    };
  }

  if (/error\s*2003|can't connect|connection refused|econnrefused/i.test(text) || lower.includes("connect")) {
    if (/refused|2003|econnrefused|timed out|timeout|unreachable/i.test(text)) {
      return {
        kind: "error",
        title: "无法连接",
        message: "主机不可达，或端口未开 / 服务未启动。",
        detail: text,
      };
    }
  }

  if (/error\s*1049|unknown database/i.test(text)) {
    return {
      kind: "error",
      title: "库不存在",
      message: "数据库名不正确；可留空连接后再选。",
      detail: text,
    };
  }

  if (/驱动开发中/.test(text)) {
    return {
      kind: "warning",
      title: "驱动开发中",
      message: text,
    };
  }

  if (/开发中/.test(text)) {
    return {
      kind: "info",
      title: "即将推出",
      message: text.replace(/：开发中$/, "功能开发中。"),
    };
  }

  return {
    kind: "error",
    title: "操作失败",
    message: text.length > 120 ? "发生错误，详见详情。" : text,
    detail: text.length > 120 ? text : undefined,
  };
}

export function notifyId() {
  return crypto.randomUUID();
}