import type { BrowserCapabilities, BrowserCapabilityFlag, BrowserHealth } from "@umt/contracts";
import { BROWSER_CAPABILITY_KEYS } from "@umt/contracts";
import { BrowserError } from "./errors.ts";
import type { BrowserProvider } from "./provider.ts";

const off: BrowserCapabilityFlag = { supported: false, verified: false, source: "static", note: "未配置浏览器服务" };

export function noneCapabilities(): BrowserCapabilities {
  const flags = Object.fromEntries(BROWSER_CAPABILITY_KEYS.map((k) => [k, { ...off }])) as Record<
    (typeof BROWSER_CAPABILITY_KEYS)[number],
    BrowserCapabilityFlag
  >;
  return { ...flags, upstreamVersion: null, probedAt: null };
}

const unavailable = () => Promise.reject(new BrowserError("unavailable", "未配置浏览器服务"));

/**
 * 默认实现:未配置浏览器服务。所有动作返回 unavailable,能力全部 false;
 * 业务侧据此在界面标注"浏览器不可用",不回退到其他浏览器。
 */
export function createNoneBrowserProvider(): BrowserProvider {
  return {
    kind: "none",
    async health(): Promise<BrowserHealth> {
      return { status: "disabled", kind: "none", detail: {}, checkedAt: new Date().toISOString() };
    },
    async capabilities() {
      return noneCapabilities();
    },
    openSession: unavailable,
    closeSession: unavailable,
    async listSessions() {
      return [];
    },
    navigate: unavailable,
    snapshot: unavailable,
    screenshot: unavailable,
    click: unavailable,
    type: unavailable,
    extract: unavailable,
    waitForDownload: unavailable,
    acquireControl: unavailable,
    releaseControl: unavailable,
    openTab: unavailable,
    closeTab: unavailable,
    history: unavailable,
    select: unavailable,
    scroll: unavailable,
    press: unavailable,
    setController() {
      throw new BrowserError("unavailable", "未配置浏览器服务");
    },
    restoreSession() {
      throw new BrowserError("unavailable", "未配置浏览器服务");
    },
    reconcileTabs: unavailable,
    sessionInfo: () => null,
    drain: async () => {},
  };
}