/**
 * 占位符表单组件
 * 用于合同起草时填写占位符值
 */

import { useEffect, useState } from 'react';
import { messageService } from '~/components/ui/MessageModal';
import type { PlaceholderSchema } from '~/types/contract-draft';

interface PlaceholderFormProps {
  schema: PlaceholderSchema | null;
  values: Record<string, string>;
  onChange: (values: Record<string, string>) => void;
  onComplete: () => void;
  isDeleting: boolean;  // 是否正在删除
  onSingleReplace?: (key: string, value: string) => void;  // 单个替换
  onFieldFocus?: (key: string) => void;  // 字段聚焦（高亮）
}

export function PlaceholderForm({
  schema,
  values,
  onChange,
  onComplete,
  isDeleting,
  onSingleReplace,
  onFieldFocus
}: PlaceholderFormProps) {
  const [localValues, setLocalValues] = useState<Record<string, string>>(values);
  const [replacingFields, setReplacingFields] = useState<Set<string>>(new Set());
  // 【新增】记录当前高亮的字段（只存一个值），避免重复高亮导致焦点被抢
  const [currentHighlightedField, setCurrentHighlightedField] = useState<string | null>(null);

  // 同步外部 values 到本地状态
  useEffect(() => {
    setLocalValues(values);
  }, [values]);

  // 处理字段变化
  const handleFieldChange = (key: string, value: string) => {
    const newValues = { ...localValues, [key]: value };
    setLocalValues(newValues);
    onChange(newValues);
  };

  // 处理字段点击（高亮文档中的占位符）
  const handleFieldClick = async (e: React.MouseEvent<HTMLInputElement | HTMLTextAreaElement>, key: string) => {
    // 1. 检查是否已经高亮当前字段
    if (currentHighlightedField === key) {
      console.log(`[PlaceholderForm] 字段 "${key}" 已高亮，跳过高亮操作`);
      return;
    }

    // 2. 捕获当前输入框 DOM 元素
    const inputElement = e.currentTarget;

    // 3. 更新当前高亮字段（只保存一个）
    setCurrentHighlightedField(key);
    console.log(`[PlaceholderForm] 切换高亮字段到 "${key}"`);

    // 4. 调用父组件的高亮回调
    if (onFieldFocus) {
      onFieldFocus(key);
    }

    // 5. 【核心】延迟后强制夺回焦点（UNO 命令会让 iframe 抢焦点）
    // 分多次确保焦点回到输入框，防止被 iframe 再次抢走
    const refocusWithRetry = () => {
      console.log(`[PlaceholderForm] 夺回焦点到输入框 "${key}"`);
      inputElement.focus();

      // 保持光标在文字最后
      const len = inputElement.value.length;
      if ('setSelectionRange' in inputElement) {
        inputElement.setSelectionRange(len, len);
      }
    };

    // 第一次夺回焦点：150ms（高亮操作完成时）
    setTimeout(refocusWithRetry, 150);

    // 第二次确认焦点：300ms（确保没有被再次抢走）
    setTimeout(refocusWithRetry, 300);
  };

  // 处理单个字段替换
  const handleSingleReplace = async (key: string) => {
    const value = localValues[key];
    if (!value || !onSingleReplace) return;

    setReplacingFields(prev => new Set(prev).add(key));
    try {
      await onSingleReplace(key, value);
    } finally {
      setReplacingFields(prev => {
        const next = new Set(prev);
        next.delete(key);
        return next;
      });
    }
  };

  // 检查是否有未填写的必填字段
  const getMissingRequiredFields = () => {
    if (!schema) return [];
    return schema.fields
      .filter(f => f.required && !localValues[f.key])
      .map(f => f.label);
  };

  const handleCompleteClick = () => {
    const missing = getMissingRequiredFields();
    if (missing.length > 0) {
      messageService.show({
        type: 'warning',
        title: '字段校验失败',
        message: '请填写以下必填字段：',
        children: (
          <ul className="list-disc list-inside mt-2 space-y-1">
            {missing.map((field, index) => (
              <li key={index} className="text-gray-700">{field}</li>
            ))}
          </ul>
        ),
        confirmText: '确定'
      });
      return;
    }
    onComplete();
  };

  if (!schema || !schema.fields || schema.fields.length === 0) {
    return (
      <div className="h-full flex items-center justify-center p-8">
        <div className="text-center">
          <div className="w-16 h-16 mx-auto mb-4 rounded-full bg-gray-100 flex items-center justify-center">
            <i className="ri-information-line text-3xl text-gray-400"></i>
          </div>
          <h3 className="text-lg font-semibold text-gray-700 mb-2">暂无占位符配置</h3>
          <p className="text-sm text-gray-500">该模板尚未配置占位符字段</p>
          <p className="text-xs text-gray-400 mt-2">请联系管理员配置模板占位符</p>
        </div>
      </div>
    );
  }

  return (
    <div className="h-full flex flex-col bg-white">
      {/* 表单头部 */}
      <div className="px-6 py-4 border-b border-gray-200 bg-gradient-to-r from-blue-50 to-white">
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-3">
            <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-primary to-[#004d38] flex items-center justify-center shadow-sm">
              <i className="ri-file-edit-line text-white text-base"></i>
            </div>
            <h2 className="text-lg font-bold text-gray-900">填写合同信息</h2>
          </div>

          {/* 完成按钮 */}
          <button
            onClick={handleCompleteClick}
            disabled={isDeleting}
            className={`flex items-center justify-center gap-1.5 px-6 py-2 text-sm font-medium rounded-lg transition-all duration-150 ${isDeleting
              ? 'bg-gray-200 text-gray-400 cursor-not-allowed'
              : 'bg-green-600 text-white hover:bg-green-700 hover:shadow-md active:scale-[0.98]'
              }`}
          >
            {isDeleting ? (
              <>
                <i className="ri-loader-4-line animate-spin"></i>
                <span>处理中</span>
              </>
            ) : (
              <>
                <i className="ri-check-line"></i>
                <span>完成</span>
              </>
            )}
          </button>
        </div>
      </div>

      {/* 表单内容区域 */}
      <div className="flex-1 overflow-y-auto px-6 py-4">
        <div className="space-y-4">
          {schema?.fields.map((field) => (
            <div key={field.key} className="form-field">
              <label className="block text-sm font-medium text-gray-700 mb-1.5">
                {field.label}
                {field.required && (
                  <span className="text-red-500 ml-1">*</span>
                )}
              </label>

              <div className="flex gap-2">
                {field.type === 'textarea' ? (
                  <textarea
                    value={localValues[field.key] || ''}
                    onChange={(e) => handleFieldChange(field.key, e.target.value)}
                    onClick={(e) => handleFieldClick(e, field.key)}
                    placeholder={field.placeholder || `请输入${field.label}`}
                    className="flex-1 px-3 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary/20 focus:border-primary transition-all duration-150 resize-none bg-white text-gray-900 placeholder-gray-400 text-sm"
                    rows={3}
                  />
                ) : (
                  <input
                    type={field.type}
                    value={localValues[field.key] || ''}
                    onChange={(e) => handleFieldChange(field.key, e.target.value)}
                    onClick={(e) => handleFieldClick(e, field.key)}
                    placeholder={field.placeholder || `请输入${field.label}`}
                    className="flex-1 px-3 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary/20 focus:border-primary transition-all duration-150 bg-white text-gray-900 placeholder-gray-400 text-sm"
                  />
                )}

                {/* 单独的替换按钮 */}
                <button
                  onClick={() => handleSingleReplace(field.key)}
                  disabled={!localValues[field.key] || replacingFields.has(field.key)}
                  className={`px-3 py-2 rounded-lg transition-all duration-150 flex items-center gap-1.5 text-sm font-medium whitespace-nowrap ${!localValues[field.key] || replacingFields.has(field.key)
                    ? 'bg-gray-100 text-gray-400 cursor-not-allowed'
                    : 'bg-primary text-white hover:bg-primary-hover shadow-sm hover:shadow'
                    }`}
                  title="替换此占位符"
                >
                  {replacingFields.has(field.key) ? (
                    <>
                      <i className="ri-loader-4-line animate-spin text-base"></i>
                      <span>替换中</span>
                    </>
                  ) : (
                    <>
                      <i className="ri-refresh-line text-base"></i>
                      <span>替换</span>
                    </>
                  )}
                </button>
              </div>
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}