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

import '../../domain/ai/frame_candidate.dart';
import '../../domain/models/habit.dart';
import '../../state/ai_providers.dart';

/// Shows L2/L3 suggestion cards from suggestFrame. Returns the selected
/// FrameCandidate (with level + framedText) via Navigator.pop.
class FrameSuggestionDialog extends ConsumerWidget {
  final SuggestFrameInput input;
  const FrameSuggestionDialog({super.key, required this.input});

  static Future<FrameCandidate?> show(
    BuildContext context, {
    required SuggestFrameInput input,
  }) {
    return showDialog<FrameCandidate>(
      context: context,
      builder: (_) => FrameSuggestionDialog(input: input),
    );
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final async = ref.watch(frameSuggestionsProvider(input));
    return AlertDialog(
      title: const Text('AI 제안'),
      content: SizedBox(
        width: 320,
        child: async.when(
          loading: () => const SizedBox(
            height: 120,
            child: Center(child: CircularProgressIndicator()),
          ),
          error: (e, _) => Padding(
            padding: const EdgeInsets.all(8),
            child: Text('AI 제안을 받지 못했습니다. 직접 입력해주세요.\n($e)'),
          ),
          data: (candidates) {
            if (candidates.isEmpty) {
              return Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  const Padding(
                    padding: EdgeInsets.all(8),
                    child: Text(
                      '더 구체적으로 입력해주시면 더 좋은 제안을 드릴 수 있어요.',
                    ),
                  ),
                  TextButton(
                    onPressed: () {
                      ref.invalidate(frameSuggestionsProvider(input));
                    },
                    child: const Text('다시 시도'),
                  ),
                ],
              );
            }
            return Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                for (final c in candidates)
                  _CandidateCard(
                    candidate: c,
                    onTap: () => Navigator.of(context).pop(c),
                  ),
              ],
            );
          },
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('취소'),
        ),
      ],
    );
  }
}

class _CandidateCard extends StatelessWidget {
  final FrameCandidate candidate;
  final VoidCallback onTap;
  const _CandidateCard({required this.candidate, required this.onTap});

  @override
  Widget build(BuildContext context) {
    return Card(
      child: ListTile(
        title: Text(candidate.framedText),
        subtitle: Text(
          '${candidate.level == FrameLevel.l3 ? "L3 · 정체성" : "L2 · 조건부 긍정"} '
          '· 신뢰도 ${(candidate.confidence * 100).toInt()}%',
        ),
        onTap: onTap,
      ),
    );
  }
}