import 'package:flutter/material.dart';
import 'package:social_app/core/theme/design_tokens.dart';
import '../../data/models/tool_result.dart';

/// 卡片类型常量
const _calendarCardType = 'calendar_card.v1';
const _calendarListType = 'calendar_event_list.v1';
const _calendarOperationType = 'calendar_operation.v1';
const _errorCardType = 'error_card.v1';
const _aiGeneratedSource = 'ai_generated';
const _agentGeneratedSource = 'agent_generated';
const _primaryActionType = 'primary';

class UiSchemaRenderer {
  static Widget render(UiCard card) {
    return switch (card.cardType) {
      _calendarCardType => _renderCalendarCard(card),
      _calendarListType => _renderCalendarList(card),
      _calendarOperationType => _renderCalendarOperation(card),
      _errorCardType => _renderErrorCard(card),
      _ => _renderUnknownCard(card),
    };
  }

  static Widget _renderCalendarCard(UiCard card) {
    final data = CalendarCardData.fromJson(card.data);
    final color = data.color != null
        ? Color(int.parse(data.color!.replaceFirst('#', '0xFF')))
        : AppColors.blue500;
    final isAiGenerated =
        data.sourceType == _aiGeneratedSource ||
        data.sourceType == _agentGeneratedSource;

    return Container(
      decoration: BoxDecoration(
        color: AppColors.messageCardBg,
        borderRadius: BorderRadius.circular(AppRadius.lg),
        border: Border.all(color: AppColors.messageCardBorder),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            height: AppSpacing.sm,
            decoration: BoxDecoration(
              color: color,
              borderRadius: BorderRadius.only(
                topLeft: Radius.circular(AppRadius.lg),
                topRight: Radius.circular(AppRadius.lg),
              ),
            ),
          ),
          Padding(
            padding: EdgeInsets.all(AppSpacing.lg),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                if (isAiGenerated) ...[
                  _buildAiTag(),
                  SizedBox(height: AppSpacing.sm),
                ],
                Text(
                  _formatTime(data.startAt, data.endAt),
                  style: TextStyle(fontSize: 12, color: AppColors.slate500),
                ),
                SizedBox(height: AppSpacing.sm),
                Text(
                  data.title,
                  style: TextStyle(
                    fontSize: 16,
                    fontWeight: FontWeight.w600,
                    color: AppColors.slate900,
                  ),
                ),
                if (data.description != null) ...[
                  SizedBox(height: AppSpacing.xs),
                  Text(
                    data.description!,
                    style: TextStyle(fontSize: 14, color: AppColors.slate600),
                  ),
                ],
                if (data.location != null) ...[
                  SizedBox(height: AppSpacing.sm),
                  _buildLocation(data.location!),
                ],
                if (card.actions != null && card.actions!.isNotEmpty) ...[
                  SizedBox(height: AppSpacing.md),
                  _buildActions(card.actions!),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }

  static Widget _buildAiTag() {
    return Container(
      padding: EdgeInsets.symmetric(
        horizontal: AppSpacing.sm,
        vertical: AppSpacing.xs,
      ),
      decoration: BoxDecoration(
        color: AppColors.messageTagBg,
        borderRadius: BorderRadius.circular(AppRadius.sm),
      ),
      child: Text(
        'AI生成',
        style: TextStyle(fontSize: 10, color: AppColors.blue600),
      ),
    );
  }

  static Widget _buildLocation(String location) {
    return Row(
      children: [
        Icon(Icons.location_on_outlined, size: 16, color: AppColors.slate500),
        SizedBox(width: AppSpacing.xs),
        Text(
          location,
          style: TextStyle(fontSize: 12, color: AppColors.slate500),
        ),
      ],
    );
  }

  static Widget _buildActions(List<CardAction> actions) {
    return Wrap(
      spacing: AppSpacing.sm,
      children: actions.map((action) => _buildActionButton(action)).toList(),
    );
  }

  static Widget _buildActionButton(CardAction action) {
    final isPrimary = action.type == _primaryActionType;
    return GestureDetector(
      onTap: () => _handleAction(action),
      child: Container(
        padding: EdgeInsets.symmetric(
          horizontal: AppSpacing.md,
          vertical: AppSpacing.sm,
        ),
        decoration: BoxDecoration(
          color: isPrimary ? AppColors.blue500 : AppColors.messageBtnWrap,
          borderRadius: BorderRadius.circular(AppRadius.sm),
          border: Border.all(
            color: isPrimary ? AppColors.blue500 : AppColors.messageBtnBorder,
          ),
        ),
        child: Text(
          action.label,
          style: TextStyle(
            fontSize: 14,
            color: isPrimary ? AppColors.white : AppColors.slate600,
          ),
        ),
      ),
    );
  }

  static Widget _renderCalendarList(UiCard card) {
    final rawItems = card.data['items'];
    final items = rawItems is List ? rawItems : const [];
    final paginationRaw = card.data['pagination'];
    final pagination = paginationRaw is Map<String, dynamic>
        ? paginationRaw
        : const <String, dynamic>{};
    final page = pagination['page'];
    final total = pagination['total'];

    return Container(
      padding: EdgeInsets.all(AppSpacing.lg),
      decoration: BoxDecoration(
        color: AppColors.messageCardBg,
        borderRadius: BorderRadius.circular(AppRadius.lg),
        border: Border.all(color: AppColors.messageCardBorder),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '日程列表',
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.w600,
              color: AppColors.slate900,
            ),
          ),
          if (page != null || total != null) ...[
            SizedBox(height: AppSpacing.xs),
            Text(
              '第${page ?? '-'}页 · 共${total ?? '-'}条',
              style: TextStyle(fontSize: 12, color: AppColors.slate500),
            ),
          ],
          SizedBox(height: AppSpacing.sm),
          if (items.isEmpty)
            Text(
              '暂无日程',
              style: TextStyle(fontSize: 14, color: AppColors.slate500),
            ),
          for (final item in items)
            if (item is Map<String, dynamic>)
              Padding(
                padding: EdgeInsets.only(bottom: AppSpacing.xs),
                child: Text(
                  item['title']?.toString() ?? '未命名日程',
                  style: TextStyle(fontSize: 14, color: AppColors.slate700),
                ),
              ),
        ],
      ),
    );
  }

  static Widget _renderCalendarOperation(UiCard card) {
    final ok = card.data['ok'] == true;
    final operation = card.data['operation']?.toString() ?? 'operation';
    final message = card.data['message']?.toString() ?? (ok ? '操作成功' : '操作失败');

    return Container(
      padding: EdgeInsets.all(AppSpacing.lg),
      decoration: BoxDecoration(
        color: ok ? AppColors.messageCardBg : AppColors.warningBackground,
        borderRadius: BorderRadius.circular(AppRadius.lg),
        border: Border.all(
          color: ok ? AppColors.messageCardBorder : AppColors.red400,
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '日程$operation结果',
            style: TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.w600,
              color: ok ? AppColors.slate900 : AppColors.red600,
            ),
          ),
          SizedBox(height: AppSpacing.xs),
          Text(
            message,
            style: TextStyle(
              fontSize: 13,
              color: ok ? AppColors.slate600 : AppColors.red600,
            ),
          ),
          if (card.actions != null && card.actions!.isNotEmpty) ...[
            SizedBox(height: AppSpacing.md),
            _buildActions(card.actions!),
          ],
        ],
      ),
    );
  }

  static Widget _renderErrorCard(UiCard card) {
    final message = card.data['message'] as String? ?? '发生错误';

    return Container(
      padding: EdgeInsets.all(AppSpacing.lg),
      decoration: BoxDecoration(
        color: AppColors.warningBackground,
        borderRadius: BorderRadius.circular(AppRadius.lg),
        border: Border.all(color: AppColors.red400),
      ),
      child: Row(
        children: [
          Icon(Icons.error_outline, size: 20, color: AppColors.red600),
          SizedBox(width: AppSpacing.sm),
          Expanded(
            child: Text(
              message,
              style: TextStyle(fontSize: 14, color: AppColors.red600),
            ),
          ),
        ],
      ),
    );
  }

  static Widget _renderUnknownCard(UiCard card) {
    return Container(
      padding: EdgeInsets.all(AppSpacing.lg),
      decoration: BoxDecoration(
        color: AppColors.messageCardBg,
        borderRadius: BorderRadius.circular(AppRadius.lg),
        border: Border.all(color: AppColors.border),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            '未知卡片类型: ${card.cardType}',
            style: TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.w500,
              color: AppColors.slate600,
            ),
          ),
          SizedBox(height: AppSpacing.sm),
          Text(
            card.data.toString(),
            style: TextStyle(fontSize: 12, color: AppColors.slate500),
          ),
        ],
      ),
    );
  }

  static String _formatTime(String startAt, String? endAt) {
    try {
      final start = DateTime.parse(startAt);
      final buffer = StringBuffer();

      buffer.write('${start.month}月${start.day}日 ');
      buffer.write(
        '${start.hour.toString().padLeft(2, '0')}:${start.minute.toString().padLeft(2, '0')}',
      );

      if (endAt != null) {
        final end = DateTime.parse(endAt);
        buffer.write(
          ' - ${end.hour.toString().padLeft(2, '0')}:${end.minute.toString().padLeft(2, '0')}',
        );
      }

      return buffer.toString();
    } catch (e) {
      return startAt;
    }
  }

  static void _handleAction(CardAction action) {
    // TODO: 实现 action 处理
  }
}