import 'dart:convert';

import 'package:flutter/material.dart';

import 'tool_definition.dart';

/// Modal Confirm gate for destructive tools (ADR-0005 §OQ-3).
///
/// Shown by [ToolDispatcher] right before invoking a destructive handler.
/// Returns `true` only if the user explicitly tapped the confirm action;
/// outside-tap / back-press / unmounted-context all return `false`.
class ConfirmGate {
  const ConfirmGate();

  Future<bool> show(
    BuildContext context,
    ToolDefinition tool,
    Map<String, dynamic> args,
  ) async {
    if (!context.mounted) return false;
    final summary = tool.summarize?.call(args) ?? _fallbackSummary(args);

    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: true,
      builder: (ctx) {
        final theme = Theme.of(ctx);
        return AlertDialog(
          title: const Text('이 작업을 수행할까요?'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(tool.description, style: theme.textTheme.bodyMedium),
              const SizedBox(height: 12),
              Container(
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: theme.colorScheme.surfaceContainerHighest,
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Text(summary),
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(ctx).pop(false),
              child: const Text('취소'),
            ),
            FilledButton(
              autofocus: true,
              onPressed: () => Navigator.of(ctx).pop(true),
              child: const Text('수행'),
            ),
          ],
        );
      },
    );
    return result ?? false;
  }

  String _fallbackSummary(Map<String, dynamic> args) {
    try {
      return const JsonEncoder.withIndent('  ').convert(args);
    } catch (_) {
      return args.toString();
    }
  }
}