import { useEffect, useState } from "react";
import { Settings, Save, Loader2, Wifi, WifiOff } from "lucide-react";
import {
  getPrinterConfig,
  updatePrinterConfig,
  type PrinterConfig,
} from "../../services/printApi";
import { useToast } from "../../components/ui/Toast";

export default function AdminPrintConfigPage() {
  const { toast } = useToast();

  const [config, setConfig] = useState<PrinterConfig | null>(null);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);

  // 表单字段
  const [ip, setIp] = useState("");
  const [port, setPort] = useState(9100);
  const [enabled, setEnabled] = useState(true);

  useEffect(() => {
    loadConfig();
  }, []);

  async function loadConfig() {
    setLoading(true);
    try {
      const cfg = await getPrinterConfig();
      setConfig(cfg);
      const lp = cfg.label_printer;
      setIp(lp.ip);
      setPort(lp.port);
      setEnabled(lp.enabled ?? true);
    } catch (err: any) {
      toast(err?.response?.data?.detail ?? "加载配置失败", "error");
    } finally {
      setLoading(false);
    }
  }

  async function handleSave(e: React.FormEvent) {
    e.preventDefault();
    if (!ip.trim()) {
      toast("请输入打印机 IP 地址", "error");
      return;
    }
    setSaving(true);
    try {
      const result = await updatePrinterConfig(ip.trim(), port, enabled);
      toast(result.message, "success");
    } catch (err: any) {
      toast(err?.response?.data?.detail ?? "保存失败", "error");
    } finally {
      setSaving(false);
    }
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center py-20">
        <Loader2 className="h-8 w-8 animate-spin text-blue-500" />
      </div>
    );
  }

  return (
    <div>
      <div className="mb-6">
        <h2 className="text-xl font-bold text-gray-800">打印机设置</h2>
        <p className="mt-1 text-sm text-gray-500">
          配置标签打印机（热敏打标机）的 IP 地址和端口，协议: TSPL
        </p>
      </div>

      <div className="max-w-md rounded-xl bg-white p-6 shadow-sm">
        <form onSubmit={handleSave} className="space-y-4">
          {/* IP 地址 */}
          <div>
            <label className="mb-1 block text-sm font-medium text-gray-700">
              打印机 IP 地址
            </label>
            <input
              type="text"
              value={ip}
              onChange={(e) => setIp(e.target.value)}
              placeholder="如 192.168.9.221"
              className="w-full rounded-lg border border-gray-200 px-3 py-2.5 text-sm font-mono focus:border-blue-400 focus:outline-none focus:ring-2 focus:ring-blue-100"
            />
          </div>

          {/* 端口 */}
          <div>
            <label className="mb-1 block text-sm font-medium text-gray-700">
              端口
            </label>
            <input
              type="number"
              value={port}
              onChange={(e) => setPort(Number(e.target.value))}
              min={1}
              max={65535}
              className="w-full rounded-lg border border-gray-200 px-3 py-2.5 text-sm font-mono focus:border-blue-400 focus:outline-none focus:ring-2 focus:ring-blue-100"
            />
            <p className="mt-0.5 text-xs text-gray-400">
              热敏打印机通常使用 9100 端口（Raw Socket）
            </p>
          </div>

          {/* 启用状态 */}
          <label className="flex items-center gap-3 cursor-pointer select-none">
            <input
              type="checkbox"
              checked={enabled}
              onChange={(e) => setEnabled(e.target.checked)}
              className="h-4 w-4 rounded border-gray-300 text-blue-600 focus:ring-blue-500"
            />
            <div className="flex items-center gap-1.5">
              {enabled ? (
                <Wifi className="h-4 w-4 text-green-500" />
              ) : (
                <WifiOff className="h-4 w-4 text-gray-400" />
              )}
              <span className="text-sm text-gray-700">
                {enabled ? "已启用" : "已禁用"}
              </span>
            </div>
          </label>

          {/* 保存 */}
          <button
            type="submit"
            disabled={saving}
            className="flex w-full items-center justify-center gap-2 rounded-lg bg-blue-600 py-2.5 text-sm font-medium text-white transition-colors hover:bg-blue-700 disabled:opacity-50"
          >
            {saving ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <Save className="h-4 w-4" />
            )}
            保存设置
          </button>
        </form>

        {/* 当前状态 */}
        {config?.label_printer && (
          <div className="mt-4 rounded-lg bg-gray-50 px-3 py-2.5 text-xs text-gray-500">
            <p>
              当前配置: {config.label_printer.ip}:{config.label_printer.port}
              {" · "}
              {config.label_printer.enabled ? (
                <span className="text-green-600 font-medium">已启用</span>
              ) : (
                <span className="text-gray-400">已禁用</span>
              )}
            </p>
          </div>
        )}
      </div>
    </div>
  );
}