"use client";

import { ChevronDown, ChevronRight, Database, Send, Sparkles } from "lucide-react";
import { useState } from "react";
import { Nl2SqlConsole } from "@/components/admin/sections/nl2sql-console";
import {
  Badge,
  Button,
  Card,
  ErrorState,
  LoadingBlock,
  Select,
  cn,
  useToast,
} from "@/components/admin/ui";
import { errMessage } from "@/lib/admin-api";
import { nl2sqlApi, type Nl2SqlQueryResult } from "@/lib/nl2sql-api";

/** 示例问题，避免员工面对空白输入框不知道怎么问。 */
const SAMPLES = [
  "近一个月成交额排名前十的客户有哪些？",
  "统计各风险等级客户的数量",
  "查询本月新增签约客户名单",
];

/**
 * NL2SQL 功能入口。
 * 主界面只做「自然语言问数」这一件事；权限与运维面板默认折叠在下方，
 * 需要排查问题时再展开，避免员工被配置项淹没。
 */
export function Nl2SqlSection() {
  const toast = useToast();
  const [question, setQuestion] = useState("");
  const [maxRows, setMaxRows] = useState(200);
  const [loading, setLoading] = useState(false);
  const [result, setResult] = useState<Nl2SqlQueryResult | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [showConsole, setShowConsole] = useState(false);

  const run = async (text: string) => {
    const value = text.trim();
    if (!value || loading) return;
    setLoading(true);
    setError(null);
    setResult(null);
    try {
      const data = await nl2sqlApi.query({
        question: value,
        max_rows: maxRows,
      });
      setResult(data);
    } catch (err) {
      setError(errMessage(err, "问数失败，请改写问题后重试"));
    } finally {
      setLoading(false);
    }
  };

  const columns = result?.columns ?? [];
  const rows = result?.rows ?? [];

  return (
    <div className="space-y-5">
      <Card
        title="智能问数"
        description="用自然语言提问，系统自动生成 SQL 并返回结果（受当前账号的数据权限约束）"
      >
        <div className="space-y-3">
          <textarea
            value={question}
            onChange={(event) => setQuestion(event.target.value)}
            onKeyDown={(event) => {
              if (event.key === "Enter" && (event.ctrlKey || event.metaKey)) {
                event.preventDefault();
                void run(question);
              }
            }}
            rows={3}
            placeholder="例如：近一个月成交额排名前十的客户有哪些？"
            className="w-full rounded-lg border border-slate-200 px-3 py-2.5 text-sm leading-6 text-slate-700 focus:border-indigo-400 focus:outline-none"
          />

          <div className="flex flex-wrap items-center justify-between gap-3">
            <div className="flex flex-wrap gap-2">
              {SAMPLES.map((sample) => (
                <button
                  key={sample}
                  onClick={() => setQuestion(sample)}
                  className="rounded-full border border-slate-200 px-3 py-1 text-xs text-slate-500 transition-colors hover:border-indigo-300 hover:text-indigo-600"
                >
                  {sample}
                </button>
              ))}
            </div>

            <div className="flex items-center gap-2">
              <span className="text-xs text-slate-500">返回上限</span>
              <Select
                value={String(maxRows)}
                onChange={(event) => setMaxRows(Number(event.target.value))}
                className="w-24"
              >
                <option value="50">50</option>
                <option value="200">200</option>
                <option value="1000">1000</option>
              </Select>
              <Button variant="primary" loading={loading} onClick={() => void run(question)}>
                <Send className="h-4 w-4" />
                开始问数
              </Button>
            </div>
          </div>

          <p className="text-xs text-slate-400">快捷键 Ctrl / ⌘ + Enter 直接提交</p>
        </div>
      </Card>

      {loading && <LoadingBlock text="正在生成 SQL 并执行查询..." />}
      {error && <ErrorState message={error} onRetry={() => void run(question)} />}

      {result && !loading && (
        <Card
          title="查询结果"
          description={
            result.summary ??
            result.answer ??
            `共 ${result.row_count ?? rows.length} 行${result.truncated ? "（已截断）" : ""}`
          }
          actions={
            <div className="flex items-center gap-2">
              {result.elapsed_ms != null && (
                <Badge tone="info">耗时 {result.elapsed_ms} ms</Badge>
              )}
              {result.query_id && (
                <span className="font-mono text-xs text-slate-400">{result.query_id}</span>
              )}
            </div>
          }
        >
          <div className="space-y-4">
            {rows.length === 0 ? (
              <p className="py-6 text-center text-sm text-slate-400">查询未返回数据</p>
            ) : (
              <div className="overflow-x-auto rounded-lg border border-slate-200">
                <table className="w-full text-left text-sm">
                  <thead className="bg-slate-50 text-xs text-slate-500">
                    <tr>
                      {columns.map((column) => (
                        <th key={column} className="whitespace-nowrap px-3 py-2 font-medium">
                          {column}
                        </th>
                      ))}
                    </tr>
                  </thead>
                  <tbody className="divide-y divide-slate-100">
                    {rows.map((row, index) => (
                      <tr key={index} className="hover:bg-slate-50">
                        {columns.map((column) => (
                          <td
                            key={column}
                            className="whitespace-nowrap px-3 py-2 text-slate-700"
                          >
                            {formatCell(row[column])}
                          </td>
                        ))}
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            )}
          </div>
        </Card>
      )}

      <div className="rounded-xl border border-slate-200 bg-white">
        <button
          onClick={() => setShowConsole(!showConsole)}
          className="flex w-full items-center gap-2 px-5 py-3.5 text-left transition-colors hover:bg-slate-50"
        >
          {showConsole ? (
            <ChevronDown className="h-4 w-4 text-slate-400" />
          ) : (
            <ChevronRight className="h-4 w-4 text-slate-400" />
          )}
          <Database className="h-4 w-4 text-slate-400" />
          <span className="text-sm font-semibold text-slate-800">权限与运维面板</span>
          <span className="ml-auto flex items-center gap-2 text-xs text-slate-400">
            <Sparkles className="h-3.5 w-3.5" />
            只读展示 · 排查问题时展开
          </span>
        </button>

        {showConsole && (
          <div className={cn("border-t border-slate-100 p-5")}>
            <Nl2SqlConsole />
          </div>
        )}
      </div>
    </div>
  );
}

function formatCell(value: unknown): string {
  if (value === null || value === undefined) return "-";
  if (typeof value === "object") return JSON.stringify(value);
  return String(value);
}