import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../../../../core/theme/design_tokens.dart';

class AuthPageScaffold extends StatelessWidget {
  const AuthPageScaffold({
    super.key,
    required this.mainContent,
    this.footer,
    this.mainContentKey,
    this.footerKey,
  });

  final Widget mainContent;
  final Widget? footer;
  final Key? mainContentKey;
  final Key? footerKey;

  @override
  Widget build(BuildContext context) {
    final keyboardInset = MediaQuery.viewInsetsOf(context).bottom;

    return Scaffold(
      backgroundColor: AppColors.background,
      body: SafeArea(
        child: LayoutBuilder(
          builder: (context, constraints) {
            final viewportHeight = math.max(
              constraints.maxHeight - keyboardInset,
              AppSpacing.none,
            );

            return SingleChildScrollView(
              keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
              padding: EdgeInsets.fromLTRB(
                AppSpacing.xxl,
                AppSpacing.none,
                AppSpacing.xxl,
                keyboardInset + AppSpacing.xxl,
              ),
              child: ConstrainedBox(
                constraints: BoxConstraints(minHeight: viewportHeight),
                child: IntrinsicHeight(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: [
                      Expanded(
                        key: mainContentKey,
                        child: Center(child: mainContent),
                      ),
                      if (footer != null)
                        Container(key: footerKey, child: footer),
                      SizedBox(height: AppSpacing.xxl),
                    ],
                  ),
                ),
              ),
            );
          },
        ),
      ),
    );
  }
}