"use client";

import {
  ClipboardCheck,
  Crosshair,
  MapPinned,
  Radio,
  Route
} from "lucide-react";
import type { ReactNode } from "react";
import { cn } from "@/lib/utils";
import type {
  AgentChatMessage
} from "../types";

export function AgentOperationalBrief({
  messages,
  statusLabel,
  streaming,
  onSubmitCommand
}: {
  messages: AgentChatMessage[];
  statusLabel: string;
  streaming: boolean;
  onSubmitCommand: (prompt: string) => void;
}) {
  const brief = createOperationalBrief(messages, statusLabel, streaming);

  return (
    <div className="agent-panel-control rounded-2xl p-3">
      <div className="flex items-start gap-3">
        <div className="min-w-0">
          <div className="flex items-center gap-2">
            <span className={cn("h-2 w-2 rounded-full", brief.statusDotClassName)} />
            <p className="truncate text-sm font-semibold text-slate-950">{brief.stateLabel}</p>
          </div>
          <p className="mt-1 truncate text-xs leading-5 text-slate-500" title={brief.task}>
            {brief.task}
          </p>
        </div>
      </div>

      <dl className="mt-3 grid grid-cols-3 gap-2">
        <AgentBriefMetric icon={<Radio size={13} aria-hidden="true" />} label="证据" value={brief.evidence} />
        <AgentBriefMetric icon={<Route size={13} aria-hidden="true" />} label="计划" value={brief.plan} />
        <AgentBriefMetric icon={<ClipboardCheck size={13} aria-hidden="true" />} label="确认" value={brief.confirmation} />
      </dl>

      <div className="mt-3 grid grid-cols-2 gap-2">
        <button
          type="button"
          className="agent-panel-primary-action flex h-9 items-center justify-center gap-1.5 rounded-xl px-3 text-xs font-semibold transition disabled:cursor-not-allowed disabled:opacity-50"
          disabled={streaming}
          onClick={() => onSubmitCommand(brief.primaryCommand)}
        >
          <MapPinned size={14} aria-hidden="true" />
          预览影响
        </button>
        <button
          type="button"
          className="surface-control flex h-9 items-center justify-center gap-1.5 rounded-xl border px-3 text-xs font-semibold text-slate-700 transition-colors hover:bg-blue-50 hover:text-blue-700 disabled:cursor-not-allowed disabled:opacity-50"
          disabled={streaming}
          onClick={() => onSubmitCommand(brief.secondaryCommand)}
        >
          <Crosshair size={14} aria-hidden="true" />
          检查证据
        </button>
      </div>
    </div>
  );
}

function AgentBriefMetric({ icon, label, value }: { icon: ReactNode; label: string; value: string }) {
  return (
    <div className="surface-reading min-w-0 rounded-xl border px-2 py-2">
      <dt className="flex items-center gap-1.5 text-xs font-semibold text-slate-500">
        <span className="text-blue-600">{icon}</span>
        {label}
      </dt>
      <dd className="mt-1 truncate text-xs font-semibold text-slate-900" title={value}>
        {value}
      </dd>
    </div>
  );
}

function createOperationalBrief(messages: AgentChatMessage[], statusLabel: string, streaming: boolean) {
  const lastUserMessage = [...messages].reverse().find((message) => message.role === "user" && message.content.trim());
  const progressItems = messages.flatMap((message) => message.progress ?? []);
  const todoItems = messages.flatMap((message) => message.todos?.todos ?? []);
  const permissionItems = messages.flatMap((message) => message.permissions ?? []);
  const questionItems = messages.flatMap((message) => message.questions ?? []);
  const latestProgress = progressItems.at(-1);
  const activeTodo =
    [...todoItems].reverse().find((todo) => todo.status === "in_progress") ??
    [...todoItems].reverse().find((todo) => todo.status === "pending");
  const pendingConfirmations =
    permissionItems.filter((permission) => permission.status === "pending" || permission.status === "error").length +
    questionItems.filter((question) => question.status === "pending" || question.status === "error").length;
  const completedSteps = progressItems.filter((item) => item.status === "completed").length;
  const task = lastUserMessage?.content.trim() || "等待调度指令";
  const evidence = latestProgress?.detail || latestProgress?.title || statusLabel;
  const plan = activeTodo?.content || (completedSteps > 0 ? `${completedSteps} 项已完成` : "待生成");
  const confirmation = pendingConfirmations > 0 ? `${pendingConfirmations} 项待确认` : "无需确认";
  const stateLabel = pendingConfirmations > 0 ? "等待人工确认" : streaming ? "Agent 分析中" : "分析完成";
  const statusDotClassName = pendingConfirmations > 0 ? "bg-orange-500" : streaming ? "bg-blue-500" : "bg-emerald-500";
  const promptContext = lastUserMessage?.content.trim() || "当前排水管网运行态势";

  return {
    task,
    evidence,
    plan,
    confirmation,
    stateLabel,
    statusDotClassName,
    primaryCommand: `请基于“${promptContext}”预览空间影响范围，并列出需要确认的操作。`,
    secondaryCommand: `请检查“${promptContext}”的证据链，按数据来源、风险和不确定性汇总。`
  };
}