import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../providers/add_bill_provider.dart';
import '../../../providers/ocr_provider.dart';
import '../../../utils/date_util.dart';
import '../add_page.dart';

/// 单条 OCR 识别结果卡片：可折叠详情 + 「选择此条」填充手动表单
class OcrResultCard extends ConsumerWidget {
  final int index;
  final bool expanded;
  final VoidCallback onToggle;

  const OcrResultCard({
    super.key,
    required this.index,
    required this.expanded,
    required this.onToggle,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(ocrProvider);
    if (index >= state.results.length) return const SizedBox.shrink();
    final result = state.results[index];
    final isExpense = result.isExpense;

    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(14),
        border: Border.all(color: const Color(0xFFE0C9A6)),
      ),
      child: Column(
        children: [
          // 头部：序号 + 金额 + 置信度 + 展开
          InkWell(
            onTap: onToggle,
            borderRadius: BorderRadius.circular(14),
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
              child: Row(
                children: [
                  Text(
                    '#${index + 1}',
                    style: const TextStyle(fontSize: 13, fontWeight: FontWeight.bold, color: Color(0xFF8D6E63)),
                  ),
                  const SizedBox(width: 12),
                  Expanded(
                    child: Text(
                      '¥${result.absAmount.toStringAsFixed(2)}',
                      style: TextStyle(
                        fontSize: 17,
                        fontWeight: FontWeight.bold,
                        color: isExpense ? const Color(0xFFEF5350) : const Color(0xFF66BB6A),
                      ),
                    ),
                  ),
                  if (result.confidence != null)
                    Padding(
                      padding: const EdgeInsets.only(right: 8),
                      child: Text(
                        '置信度 ${(result.confidence! * 100).toStringAsFixed(1)}%',
                        style: const TextStyle(fontSize: 12, color: Color(0xFFBCAAA4)),
                      ),
                    ),
                  AnimatedRotation(
                    turns: expanded ? 0.5 : 0,
                    duration: const Duration(milliseconds: 200),
                    child: const Icon(Icons.expand_more, color: Color(0xFF8D6E63)),
                  ),
                ],
              ),
            ),
          ),
          // 详情
          AnimatedCrossFade(
            duration: const Duration(milliseconds: 200),
            crossFadeState: expanded ? CrossFadeState.showSecond : CrossFadeState.showFirst,
            firstChild: const SizedBox(width: double.infinity),
            secondChild: Padding(
              padding: const EdgeInsets.fromLTRB(14, 0, 14, 12),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const Divider(height: 1, color: Color(0xFFF0E6D8)),
                  const SizedBox(height: 8),
                  _detailRow('类型', isExpense ? '支出' : '收入'),
                  if (result.merchant != null && result.merchant!.isNotEmpty)
                    _detailRow('商户', result.merchant!),
                  if (result.date != null && result.date!.isNotEmpty)
                    _detailRow('日期', parseBillDate(result.date)),
                  const SizedBox(height: 10),
                  SizedBox(
                    width: double.infinity,
                    height: 38,
                    child: OutlinedButton(
                      style: OutlinedButton.styleFrom(
                        foregroundColor: const Color(0xFFC8956E),
                        side: const BorderSide(color: Color(0xFFC8956E)),
                        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(19)),
                      ),
                      onPressed: () {
                        ref.read(addBillFormProvider.notifier).fillFromOcr(result);
                        // 切回手动记账 Tab 并清空 OCR 状态
                        ref.read(addTabProvider.notifier).set(0);
                        ref.read(ocrProvider.notifier).clearImage();
                      },
                      child: const Text('选择此条', style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600)),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _detailRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 42,
            child: Text(label, style: const TextStyle(fontSize: 13, color: Color(0xFF8D6E63))),
          ),
          Expanded(
            child: Text(value, style: const TextStyle(fontSize: 13, color: Color(0xFF5D4037))),
          ),
        ],
      ),
    );
  }
}