import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_markdown/flutter_markdown.dart';

import '../../../../l10n/app_localizations.dart';
import '../../../../shared/theme/design_tokens.dart';
import '../../../../shared/widgets/app_loading_indicator.dart';

class LegalDocumentScreen extends StatelessWidget {
  const LegalDocumentScreen({
    super.key,
    required this.title,
    required this.assetPath,
  });

  final String title;
  final String assetPath;

  Future<String> _loadAsset() async {
    try {
      final data = await rootBundle.loadString(assetPath);
      if (data.isEmpty) {
        throw Exception('Asset file is empty: $assetPath');
      }
      return data;
    } catch (e) {
      debugPrint('Failed to load asset: $assetPath, error: $e');
      rethrow;
    }
  }

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    final l10n = AppLocalizations.of(context)!;
    return Scaffold(
      backgroundColor: colors.surfaceContainerLow,
      appBar: AppBar(
        title: Text(title),
        centerTitle: true,
        backgroundColor: colors.surfaceContainerLow,
        surfaceTintColor: colors.surfaceContainerLow,
      ),
      body: FutureBuilder<String>(
        future: _loadAsset(),
        builder: (context, snapshot) {
          if (snapshot.hasError) {
            return Center(
              child: Padding(
                padding: const EdgeInsets.all(AppSpacing.lg),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Icon(Icons.error_outline, size: 48, color: colors.error),
                    const SizedBox(height: AppSpacing.md),
                    Text(
                      l10n.legalDocumentLoadFailedTitle,
                      style: Theme.of(context).textTheme.titleMedium,
                    ),
                    const SizedBox(height: AppSpacing.sm),
                    Text(
                      '${l10n.legalDocumentLoadFailedPathPrefix}: $assetPath',
                      style: Theme.of(
                        context,
                      ).textTheme.bodySmall?.copyWith(color: colors.error),
                      textAlign: TextAlign.center,
                    ),
                    const SizedBox(height: AppSpacing.xs),
                    Text(
                      '${l10n.legalDocumentLoadFailedErrorPrefix}: ${snapshot.error}',
                      style: Theme.of(
                        context,
                      ).textTheme.bodySmall?.copyWith(color: colors.error),
                      textAlign: TextAlign.center,
                    ),
                  ],
                ),
              ),
            );
          }

          if (!snapshot.hasData) {
            return const Center(
              child: AppLoadingIndicator(variant: AppLoadingVariant.surface),
            );
          }

          return Markdown(
            data: snapshot.data!,
            padding: const EdgeInsets.all(AppSpacing.lg),
            styleSheet: MarkdownStyleSheet.fromTheme(Theme.of(context))
                .copyWith(
                  p: Theme.of(
                    context,
                  ).textTheme.bodyMedium?.copyWith(height: 1.7),
                  h1: Theme.of(context).textTheme.titleLarge,
                  h2: Theme.of(context).textTheme.titleMedium,
                  h3: Theme.of(
                    context,
                  ).textTheme.titleMedium?.copyWith(color: colors.primary),
                  blockSpacing: AppSpacing.lg,
                ),
          );
        },
      ),
    );
  }
}