import { hostAllowed, type PageMetrics } from "@umt/adapters";
import type {
  BrowserControlLease,
  BrowserController,
  BrowserCoordinateSpace,
  BrowserEgressProxy,
  BrowserEvidenceRef,
  BrowserSession,
  BrowserTab,
  NavigationBudget,
} from "@umt/contracts";
import type { BrowserControlLeaseRow, BrowserSessionRow, BrowserTabRow } from "@umt/db";

// C1-E 浏览器服务层:BrowserProvider(camofox)之上的会话/标签/控制权持久化(数据库为准)、
// 站点域名白名单 + 站点限流、凭证注入、接管状态机、下载产物暂存核验。
// 适配器只是内存镜像:服务重启后按数据库恢复,旧元素引用一律失效。

export const iso = (d: Date | string | null | undefined) => (d ? new Date(d).toISOString() : null);
export type Json = Record<string, unknown>;
export const obj = (v: unknown): Json => (v && typeof v === "object" && !Array.isArray(v) ? (v as Json) : {});

export const REASON_TEXT: Record<string, string> = {
  cf_challenge: "站点要求人机验证（Cloudflare），需要你过一次",
  captcha: "登录页需要验证码",
  challenge: "页面需要人工验证",
  two_factor: "需要二次验证或本人设备确认",
  challenge_unsolved: "页面验证没能自动通过",
  login_required: "登录已失效：接管后在画面里登录一次，交还后全站生效",
  lease_expired: "人工接管超时未交还",
  agent_request: "智能体请求人工处理",
  human_released_waiting: "人工交还时选择继续等待",
};

/** 重连回到的地址:会话记录的地址是 http(s)、在站点域名内、没有被脱敏过才用;否则 null(调用方退回站点首页) */
export function restoreUrl(url: string | null, budget: NavigationBudget): string | null {
  const u = url ? safeUrl(url) : null;
  if (!u || !/^https?:$/.test(u.protocol) || !hostAllowed(u.hostname, budget.domainAllowlist)) return null;
  if (url!.includes("[REDACTED")) return null;
  return url;
}

export function safeUrl(s: string): URL | null {
  try {
    return new URL(s);
  } catch {
    return null;
  }
}

export function holderName(holder: string): string {
  return holder.includes(":") ? holder.slice(holder.indexOf(":") + 1) : holder;
}

export function toSession(r: BrowserSessionRow): BrowserSession {
  return {
    id: r.id,
    providerId: r.provider_id,
    siteId: r.site_id,
    accountId: r.account_id,
    profileKey: r.profile_key,
    controller: r.controller as BrowserController,
    currentUrl: r.current_url,
    lastActivityAt: iso(r.last_activity_at)!,
    upstreamRef: obj(r.upstream_ref),
    recoveryState: obj(r.recovery_state),
    closedAt: iso(r.closed_at),
    closeReason: r.close_reason,
    createdAt: iso(r.created_at)!,
    updatedAt: iso(r.updated_at)!,
  };
}

export function toTab(r: BrowserTabRow): BrowserTab {
  return {
    id: r.id,
    sessionId: r.session_id,
    upstreamTabId: r.upstream_tab_id,
    url: r.url,
    title: r.title,
    status: r.status as BrowserTab["status"],
    lastSnapshotAt: iso(r.last_snapshot_at),
    closedAt: iso(r.closed_at),
    createdAt: iso(r.created_at)!,
    updatedAt: iso(r.updated_at)!,
  };
}

export function toLease(r: BrowserControlLeaseRow): BrowserControlLease {
  return {
    id: r.id,
    sessionId: r.session_id,
    holderKind: r.holder_kind as BrowserControlLease["holderKind"],
    holder: r.holder,
    reason: r.reason,
    status: r.status as BrowserControlLease["status"],
    acquiredAt: iso(r.acquired_at)!,
    expiresAt: iso(r.expires_at)!,
    releasedAt: iso(r.released_at),
    releaseReason: r.release_reason,
    createdAt: iso(r.created_at)!,
    updatedAt: iso(r.updated_at)!,
  };
}

/** 视觉子流程可以接手的等待原因(验证码 / 页面挑战 / 上次没处理成功) */
export const SOLVABLE = ["captcha", "challenge", "challenge_unsolved", "cf_challenge"];

/** capture / visionAct 的结果(能力输出的公共部分) */
export interface VisionShot {
  evidence: BrowserEvidenceRef | null;
  url: string | null;
  controller: BrowserController;
  sensitive: boolean;
  imageForModel: boolean;
  note: string | null;
  textSnapshot: string | null;
  coordinates: BrowserCoordinateSpace | null;
  waitingReason: string | null;
  modelImage: { mimeType: "image/png" | "image/jpeg"; data: string; width: number; height: number } | null;
}

/** 模型坐标系:缩放后的截图 ↔ 页面视口;取不到页面度量时按原始截图尺寸、DPR 1 推定 */
export function coordinateSpace(
  src: { width: number; height: number },
  img: { width: number; height: number },
  m: PageMetrics | null,
): BrowserCoordinateSpace {
  return {
    imageWidth: img.width,
    imageHeight: img.height,
    sourceWidth: src.width,
    sourceHeight: src.height,
    viewportWidth: m?.viewportWidth ?? src.width,
    viewportHeight: m?.viewportHeight ?? src.height,
    devicePixelRatio: m?.devicePixelRatio ?? 1,
    assumed: !m,
  };
}

/** 截图像素(交给模型的缩放图)→ 页面 CSS 像素:按像素中心换算,四舍五入 */
export function screenToPage(sp: BrowserCoordinateSpace, x: number, y: number): { pageX: number; pageY: number } {
  return {
    pageX: Math.round(((x + 0.5) * sp.viewportWidth) / sp.imageWidth - 0.5),
    pageY: Math.round(((y + 0.5) * sp.viewportHeight) / sp.imageHeight - 0.5),
  };
}

/** 截图像素尺寸:PNG IHDR / JPEG SOF */
export function imageSize(data: Uint8Array): { width: number | null; height: number | null } {
  if (data.length > 24 && data[0] === 0x89 && data[1] === 0x50) {
    const v = new DataView(data.buffer, data.byteOffset, data.byteLength);
    return { width: v.getUint32(16), height: v.getUint32(20) };
  }
  if (data[0] === 0xff && data[1] === 0xd8) {
    let i = 2;
    while (i + 9 < data.length) {
      if (data[i] !== 0xff) break;
      const marker = data[i + 1]!;
      const len = (data[i + 2]! << 8) | data[i + 3]!;
      if (marker >= 0xc0 && marker <= 0xc3)
        return { width: (data[i + 7]! << 8) | data[i + 8]!, height: (data[i + 5]! << 8) | data[i + 6]! };
      i += 2 + len;
    }
  }
  return { width: null, height: null };
}

/** 代理地址 → 浏览器上下文代理(账号口令拆出来;Playwright 不认 URL 里的口令) */
export function egressProxy(url: string): BrowserEgressProxy | null {
  try {
    const u = new URL(url);
    if (!["http:", "https:", "socks4:", "socks5:"].includes(u.protocol) || !u.hostname) return null;
    return {
      server: `${u.protocol}//${u.host}`,
      ...(u.username ? { username: decodeURIComponent(u.username) } : {}),
      ...(u.password ? { password: decodeURIComponent(u.password) } : {}),
    };
  } catch {
    return null;
  }
}