import { useState, useRef, useEffect } from "react";
import { Sparkles, X, Send, Bot, Lock } from "lucide-react";
import { Button } from "./ui/button";
import { cn } from "./ui/utils";
import { useRole } from "../role-context";

interface Msg {
  role: "bot" | "user";
  text: string;
}

const quickReplies = [
  "如何发起招标委托?",
  "邀请招标和公开招标有什么区别?",
  "在线评标怎么打分?",
  "供应商如何入库?",
];

const knowledge: Record<string, string> = {
  委托:
    "发起招标委托很简单:① 点击工作台或项目管理页的「发起委托」按钮;② 在「填写需求」步骤用自然语言描述需求,点击「AI 智能解析」即可自动生成《招标委托表》;③ 确认预填单后提交审批即可。需要我带您过去吗?",
  区别:
    "公开招标面向所有符合条件的供应商发布寻源公告,参与方需报名审核;邀请招标则由您从长名单中筛选短名单进行定向邀请。两者在本平台均支持全流程线上闭环。",
  评标:
    "进入「在线评标室」后:左栏选择匿名投标人,中栏查看脱敏标书,右栏按技术分/商务分/价格分录入分数并填写评分说明,系统会同步展示 AI 雷同检测与价格合理性分析,最后点击「提交评分」。",
  入库:
    "在「供应商管理」页点击「发起入库流程」,或在短名单管理中对供应商点击「发起入库」,系统将自动同步工商风险信息并进入审批。",
  合并:
    "您好,当系统中存在同类型未完成立项的委托时,系统会自动推送合并建议。您可以在立项阶段的「合并招标建议」卡片中查看并确认合并。需要我为您演示具体步骤吗?",
  上传:
    "进入「投标中心」→ 选择项目 → 在「上传投标文件」区域上传文件,系统会自动加密并上链存证。开标前任何人都无法查看,只有您本人可查看和修改,投标截止前还可撤回重传。",
};

const dataKeywords = ["报价", "投标价", "多少钱", "金额", "中标", "得分", "分数", "名单", "谁"];

export function XiaobinAssistant() {
  const { sensitive } = useRole();
  const [open, setOpen] = useState(false);
  const [input, setInput] = useState("");
  const [msgs, setMsgs] = useState<Msg[]>([
    {
      role: "bot",
      text: "您好,我是智能助手「小滨」👋 我可以为您解答系统操作与业务咨询。注意:我不参与任何业务决策哦。请问有什么可以帮您?",
    },
  ]);
  const endRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    endRef.current?.scrollIntoView({ behavior: "smooth" });
  }, [msgs, open]);

  function answer(q: string) {
    // 流程敏感期:拒答数据类问题
    if (sensitive && dataKeywords.some((k) => q.includes(k))) {
      return "当前为教学模式（流程敏感期），数据类问题暂无法回答。暂未到查看时间，请等待系统通知。我可以继续为您讲解系统操作哦~";
    }
    const key = Object.keys(knowledge).find((k) => q.includes(k));
    return key
      ? knowledge[key]
      : "这是一个很好的问题。作为操作助手,我建议您查阅对应模块的帮助说明,或描述更具体的操作场景,我会尽力为您讲解系统使用方法。(温馨提示:业务决策需由有权限的人员完成)";
  }

  function send(text: string) {
    const q = text.trim();
    if (!q) return;
    setMsgs((m) => [...m, { role: "user", text: q }]);
    setInput("");
    setTimeout(() => {
      setMsgs((m) => [...m, { role: "bot", text: answer(q) }]);
    }, 500);
  }

  return (
    <>
      {!open && (
        <button
          onClick={() => setOpen(true)}
          className="fixed bottom-6 right-6 z-50 flex items-center gap-2 rounded-full bg-gradient-to-r from-violet-500 to-blue-600 px-4 py-3 text-white shadow-lg shadow-blue-500/30 transition-transform hover:scale-105"
        >
          <Sparkles className="size-5" />
          <span className="text-sm font-medium">小滨助手</span>
        </button>
      )}

      {open && (
        <div className="fixed bottom-6 right-6 z-50 flex h-[540px] w-[380px] flex-col overflow-hidden rounded-2xl border bg-card shadow-2xl">
          <div className="flex items-center justify-between bg-gradient-to-r from-violet-500 to-blue-600 px-4 py-3 text-white">
            <div className="flex items-center gap-2.5">
              <div className="flex size-9 items-center justify-center rounded-full bg-white/20">
                <Bot className="size-5" />
              </div>
              <div className="leading-tight">
                <div className="text-sm font-semibold">智能助手 · 小滨</div>
                <div className="flex items-center gap-1 text-[11px] text-white/80">
                  <span className="size-1.5 rounded-full bg-emerald-300" /> 在线 · 操作教学 & 业务咨询
                </div>
              </div>
            </div>
            <button onClick={() => setOpen(false)} className="rounded-md p-1 hover:bg-white/15">
              <X className="size-4" />
            </button>
          </div>

          {sensitive && (
            <div className="flex items-center gap-1.5 border-b bg-amber-50 px-4 py-2 text-xs text-amber-700">
              <Lock className="size-3.5" /> 当前为教学模式，数据类问题暂无法回答
            </div>
          )}

          <div className="flex-1 space-y-3 overflow-y-auto bg-muted/30 p-4">
            {msgs.map((m, i) => (
              <div key={i} className={cn("flex", m.role === "user" ? "justify-end" : "justify-start")}>
                <div
                  className={cn(
                    "max-w-[80%] rounded-2xl px-3.5 py-2.5 text-sm leading-relaxed",
                    m.role === "user"
                      ? "rounded-br-sm bg-primary text-primary-foreground"
                      : "rounded-bl-sm border bg-card text-card-foreground",
                  )}
                >
                  {m.text}
                </div>
              </div>
            ))}
            {msgs.length <= 1 && (
              <div className="space-y-2 pt-2">
                <p className="text-xs text-muted-foreground">猜你想问:</p>
                {quickReplies.map((q) => (
                  <button
                    key={q}
                    onClick={() => send(q)}
                    className="block w-full rounded-lg border bg-card px-3 py-2 text-left text-xs text-foreground transition-colors hover:border-primary hover:text-primary"
                  >
                    {q}
                  </button>
                ))}
              </div>
            )}
            <div ref={endRef} />
          </div>

          <div className="flex items-center gap-2 border-t bg-card p-3">
            <input
              value={input}
              onChange={(e) => setInput(e.target.value)}
              onKeyDown={(e) => e.key === "Enter" && send(input)}
              placeholder="输入您的问题…"
              className="h-9 flex-1 rounded-lg border bg-input-background px-3 text-sm outline-none focus:border-primary"
            />
            <Button size="icon" onClick={() => send(input)} className="size-9 shrink-0">
              <Send className="size-4" />
            </Button>
          </div>
        </div>
      )}
    </>
  );
}