import { Select, Spin, Input, Tooltip } from 'antd';
import { QuestionCircleOutlined } from '@ant-design/icons';
import { useState, useEffect, useCallback } from 'react';
import { listPluginData, getPluginEntityRegistry } from '../api/pluginData';

interface EntitySelectProps {
  pluginId: string;
  entity: string;
  labelField: string;
  searchFields?: string[];
  /** 跨插件引用的目标插件 manifest ID（如 "erp-crm"） */
  refPlugin?: string;
  /** 目标插件未安装时的降级显示文本 */
  fallbackLabel?: string;
  value?: string;
  onChange?: (value: string, label: string) => void;
  cascadeFrom?: string;
  cascadeFilter?: string;
  cascadeValue?: string;
  placeholder?: string;
}

export default function EntitySelect({
  pluginId,
  entity,
  labelField,
  searchFields: _searchFields,
  refPlugin,
  fallbackLabel,
  value,
  onChange,
  cascadeFrom,
  cascadeFilter,
  cascadeValue,
  placeholder,
}: EntitySelectProps) {
  const [options, setOptions] = useState<{ value: string; label: string }[]>([]);
  const [loading, setLoading] = useState(false);
  const [targetUnavailable, setTargetUnavailable] = useState(false);
  const [resolvedPluginId, setResolvedPluginId] = useState<string | null>(null);

  // 跨插件时：先解析 manifest_id → plugin UUID
  useEffect(() => {
    if (!refPlugin) {
      setResolvedPluginId(pluginId);
      return;
    }
    let cancelled = false;
    (async () => {
      try {
        const registry = await getPluginEntityRegistry();
        const match = registry.find((e) => e.manifest_id === refPlugin && e.entity_name === entity);
        if (!cancelled) {
          setResolvedPluginId(match ? match.plugin_id : null);
          if (!match) setTargetUnavailable(true);
        }
      } catch {
        if (!cancelled) {
          setTargetUnavailable(true);
          setResolvedPluginId(null);
        }
      }
    })();
    return () => { cancelled = true; };
  }, [refPlugin, pluginId, entity]);

  const effectivePluginId = resolvedPluginId || pluginId;

  const fetchData = useCallback(
    async (keyword?: string) => {
      if (!resolvedPluginId && refPlugin) return;
      setLoading(true);
      try {
        const filter: Record<string, string> | undefined =
          cascadeFrom && cascadeFilter && cascadeValue
            ? { [cascadeFilter]: cascadeValue }
            : undefined;

        const result = await listPluginData(effectivePluginId, entity, 1, 20, {
          search: keyword,
          filter,
        });

        const items = (result.data || []).map((item) => ({
          value: item.id,
          label: String(item.data?.[labelField] ?? item.id),
        }));
        setOptions(items);
        setTargetUnavailable(false);
      } catch {
        if (refPlugin) {
          setTargetUnavailable(true);
          setOptions([]);
        }
      } finally {
        setLoading(false);
      }
    },
    [effectivePluginId, entity, labelField, cascadeFrom, cascadeFilter, cascadeValue, refPlugin, resolvedPluginId],
  );

  useEffect(() => {
    if (resolvedPluginId || !refPlugin) {
      fetchData();
    }
  }, [fetchData, resolvedPluginId, refPlugin]);

  // 目标插件未安装 → 降级显示
  if (targetUnavailable) {
    return (
      <Input
        value={value || ''}
        placeholder={fallbackLabel || `外部引用 (${refPlugin})`}
        disabled
        suffix={
          <Tooltip title="目标插件未安装，此字段暂时不可用">
            <QuestionCircleOutlined style={{ color: '#999' }} />
          </Tooltip>
        }
      />
    );
  }

  return (
    <Select
      showSearch
      value={value}
      placeholder={placeholder || '请选择'}
      loading={loading}
      options={options}
      onSearch={(v) => fetchData(v)}
      onChange={(v) => {
        const opt = options.find((o) => o.value === v);
        onChange?.(v, opt?.label || '');
      }}
      filterOption={false}
      notFoundContent={loading ? <Spin size="small" /> : '无数据'}
      allowClear
    />
  );
}