/**
 * 代理错误分层条：proxy | target | auth（产品/设计 P0 不砍）
 * 线框：中文 LayerTag 芯片「代理 / 目标 / 鉴权」；unknown 中性灰
 */
import { openExternal } from "../openExternal";
import { useWorkspace } from "../workspaceStore";
import { cx } from "./common";

export type ProxyErrorLayer = "proxy" | "target" | "auth" | "unknown";

export type ClassifiedError = {
  layer: ProxyErrorLayer;
  title: string;
  detail: string;
  actions: { label: string; onClick: () => void; primary?: boolean }[];
};

const LAYER_LABEL: Record<ProxyErrorLayer, string> = {
  proxy: "代理",
  target: "目标",
  auth: "鉴权",
  unknown: "未知",
};

export function classifyRequestError(message: string): ClassifiedError {
  const m = message.toLowerCase();

  if (
    m.includes("proxy") ||
    m.includes("econnrefused") ||
    m.includes("8787") ||
    m.includes("failed to fetch") ||
    m.includes("networkerror") ||
    m.includes("gin-proxy") ||
    m.includes("load failed")
  ) {
    return {
      layer: "proxy",
      title: "代理层失败",
      detail: message,
      actions: [
        {
          label: "检查本地代理",
          primary: true,
          onClick: () => void openExternal("http://127.0.0.1:8787/health"),
        },
        {
          label: "切换桌面直连",
          primary: true,
          onClick: () => {
            useWorkspace.getState().patchSettings({ transportMode: "tauri-native" });
          },
        },
        {
          label: "查看通道说明",
          onClick: () => useWorkspace.getState().setDialog({ type: "settings" }),
        },
      ],
    };
  }

  if (
    m.includes("401") ||
    m.includes("403") ||
    m.includes("unauthorized") ||
    m.includes("forbidden") ||
    m.includes("token") ||
    m.includes("鉴权") ||
    (m.includes("auth") && !m.includes("author"))
  ) {
    return {
      layer: "auth",
      title: "鉴权层失败",
      detail: message,
      actions: [
        {
          label: "检查 Token / Auth",
          primary: true,
          onClick: () => {
            useWorkspace.getState().setDialog({ type: "environments" });
          },
        },
      ],
    };
  }

  if (
    m.includes("timeout") ||
    m.includes("enotfound") ||
    m.includes("404") ||
    m.includes("502") ||
    m.includes("503") ||
    m.includes("ssl") ||
    m.includes("certificate") ||
    m.includes("target") ||
    m.includes("dns")
  ) {
    return {
      layer: "target",
      title: "目标服务失败",
      detail: message,
      actions: [
        {
          label: "检查 BaseURL / VPN",
          primary: true,
          onClick: () => useWorkspace.getState().setDialog({ type: "environments" }),
        },
      ],
    };
  }

  return {
    layer: "unknown",
    title: "请求失败（请按层排查）",
    detail: message,
    actions: [
      {
        label: "查代理 :8787",
        primary: true,
        onClick: () => void openExternal("http://127.0.0.1:8787/health"),
      },
      {
        label: "切换桌面直连",
        primary: true,
        onClick: () => useWorkspace.getState().patchSettings({ transportMode: "tauri-native" }),
      },
      {
        label: "查环境 / BaseURL",
        onClick: () => useWorkspace.getState().setDialog({ type: "environments" }),
      },
    ],
  };
}

const BANNER_STYLE: Record<ProxyErrorLayer, string> = {
  proxy: "border-amber-500/40 bg-amber-500/10 text-amber-50",
  target: "border-sky-500/40 bg-sky-500/10 text-sky-50",
  auth: "border-rose-500/40 bg-rose-500/10 text-rose-50",
  unknown: "border-zinc-500/40 bg-zinc-500/10 text-zinc-100",
};

const TAG_STYLE: Record<ProxyErrorLayer, string> = {
  proxy: "bg-amber-500/25 text-amber-100 ring-amber-400/40",
  target: "bg-sky-500/25 text-sky-100 ring-sky-400/40",
  auth: "bg-rose-500/25 text-rose-100 ring-rose-400/40",
  unknown: "bg-zinc-500/30 text-zinc-200 ring-zinc-400/40",
};

function LayerTag({ layer }: { layer: ProxyErrorLayer }) {
  return (
    <span
      className={cx(
        "inline-flex items-center rounded-full px-2 py-0.5 text-[11px] font-semibold tracking-wide ring-1 ring-inset",
        TAG_STYLE[layer],
      )}
    >
      {LAYER_LABEL[layer]}
    </span>
  );
}

export function ProxyErrorBanner({ message, onDismiss }: { message: string; onDismiss?: () => void }) {
  const info = classifyRequestError(message);
  return (
    <div className={cx("mb-3 rounded-lg border px-3 py-2.5 text-[13px]", BANNER_STYLE[info.layer])}>
      <div className="mb-1.5 flex items-start justify-between gap-2">
        <div className="flex min-w-0 flex-wrap items-center gap-2">
          <LayerTag layer={info.layer} />
          <span className="font-semibold">{info.title}</span>
        </div>
        {onDismiss && (
          <button type="button" className="ops-btn ops-btn-ghost px-1 py-0 text-xs opacity-70" onClick={onDismiss}>
            ✕
          </button>
        )}
      </div>
      <div className="whitespace-pre-wrap opacity-90">{info.detail}</div>
      <div className="mt-2.5 flex flex-wrap items-center gap-2">
        {info.actions.map((a) =>
          a.primary ? (
            <button key={a.label} type="button" className="ops-btn ops-btn-secondary text-xs" onClick={a.onClick}>
              {a.label}
            </button>
          ) : (
            <button
              key={a.label}
              type="button"
              className="text-[12px] underline-offset-2 opacity-80 hover:underline hover:opacity-100"
              onClick={a.onClick}
            >
              {a.label}
            </button>
          ),
        )}
      </div>
    </div>
  );
}