import 'package:flutter/material.dart';
import 'package:flutter_lucide/flutter_lucide.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_spacing.dart';
import '../../core/theme/app_typography.dart';
import '../../shared/widgets/top_nav_bar.dart';

/// Recharge screen - matches Pencil tPjdN
class RechargeScreen extends StatelessWidget {
  const RechargeScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: PreferredSize(
        preferredSize: const Size.fromHeight(56),
        child: TopNavBar(
          title: 'Recharge',
          showBackButton: true,
          onBack: () => Navigator.of(context).pop(),
        ),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.only(bottom: AppSpacing.screenPaddingLarge),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _CreditsSection(currentCredits: '1,280'),
            Padding(
              padding: const EdgeInsets.symmetric(
                horizontal: AppSpacing.screenPaddingLarge,
                vertical: AppSpacing.xxl,
              ),
              child: Text(
                'Select Tier',
                style: AppTypography.bodyMedium.copyWith(
                  color: AppColors.textPrimary,
                ),
              ),
            ),
            _TierCard(
              credits: '100 Credits',
              price: '¥6',
              onBuy: () {},
            ),
            const SizedBox(height: AppSpacing.xl),
            _TierCardRecommended(
              credits: '500 Credits',
              price: '¥25 Save ¥5',
              onBuy: () {},
            ),
            const SizedBox(height: AppSpacing.xl),
            _TierCardPopular(
              credits: '1,000 Credits',
              price: '¥45 Save ¥15',
              onBuy: () {},
            ),
          ],
        ),
      ),
    );
  }
}

class _CreditsSection extends StatelessWidget {
  const _CreditsSection({required this.currentCredits});

  final String currentCredits;

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.all(AppSpacing.screenPadding),
      padding: const EdgeInsets.symmetric(
        horizontal: AppSpacing.xxl,
        vertical: AppSpacing.xl,
      ),
      decoration: BoxDecoration(
        color: AppColors.primary,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(
          color: AppColors.primary.withValues(alpha: 0.5),
        ),
        boxShadow: [
          BoxShadow(
            color: AppColors.primaryShadow.withValues(alpha: 0.25),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        children: [
          Icon(LucideIcons.sparkles, size: 28, color: AppColors.surface),
          const SizedBox(width: AppSpacing.md),
          Text(
            currentCredits,
            style: AppTypography.bodyLarge.copyWith(
              fontSize: 32,
              fontWeight: FontWeight.w700,
              color: AppColors.surface,
            ),
          ),
          const Spacer(),
          Text(
            'Current Credits',
            style: AppTypography.caption.copyWith(
              color: AppColors.surface.withValues(alpha: 0.8),
            ),
          ),
        ],
      ),
    );
  }
}

class _TierCard extends StatelessWidget {
  const _TierCard({
    required this.credits,
    required this.price,
    required this.onBuy,
  });

  final String credits;
  final String price;
  final VoidCallback onBuy;

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: AppSpacing.screenPadding),
      padding: const EdgeInsets.symmetric(
        horizontal: AppSpacing.xxl,
        vertical: AppSpacing.xl,
      ),
      decoration: BoxDecoration(
        color: AppColors.surface,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: AppColors.border),
        boxShadow: [
          BoxShadow(
            color: AppColors.shadowLight,
            blurRadius: 6,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                credits,
                style: AppTypography.bodyLarge.copyWith(
                  color: AppColors.textPrimary,
                ),
              ),
              const SizedBox(height: AppSpacing.xs),
              Text(
                price,
                style: AppTypography.bodyRegular.copyWith(
                  color: AppColors.textSecondary,
                ),
              ),
            ],
          ),
          _BuyButton(onTap: onBuy),
        ],
      ),
    );
  }
}

class _TierCardRecommended extends StatelessWidget {
  const _TierCardRecommended({
    required this.credits,
    required this.price,
    required this.onBuy,
  });

  final String credits;
  final String price;
  final VoidCallback onBuy;

  @override
  Widget build(BuildContext context) {
    return Stack(
      clipBehavior: Clip.none,
      children: [
        Container(
          margin:
              const EdgeInsets.symmetric(horizontal: AppSpacing.screenPadding),
          padding: const EdgeInsets.symmetric(
            horizontal: AppSpacing.xxl,
            vertical: AppSpacing.xl,
          ),
          decoration: BoxDecoration(
            color: AppColors.surface,
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: AppColors.border),
            boxShadow: [
              BoxShadow(
                color: AppColors.shadowLight,
                blurRadius: 6,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    credits,
                    style: AppTypography.bodyLarge.copyWith(
                      color: AppColors.textPrimary,
                    ),
                  ),
                  const SizedBox(height: AppSpacing.sm),
                  Text(
                    price,
                    style: AppTypography.bodyRegular.copyWith(
                      color: AppColors.textSecondary,
                    ),
                  ),
                ],
              ),
              _BuyButton(onTap: onBuy),
            ],
          ),
        ),
        Positioned(
          top: 0,
          right: AppSpacing.screenPadding,
          child: Container(
            padding: const EdgeInsets.symmetric(
              horizontal: AppSpacing.md,
              vertical: AppSpacing.xs,
            ),
            decoration: BoxDecoration(
              color: AppColors.primaryLight,
              borderRadius: const BorderRadius.only(
                topRight: Radius.circular(16),
                bottomLeft: Radius.circular(16),
              ),
            ),
            child: Text(
              'Recommended',
              style: AppTypography.label.copyWith(
                color: AppColors.primary,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
        ),
      ],
    );
  }
}

class _TierCardPopular extends StatelessWidget {
  const _TierCardPopular({
    required this.credits,
    required this.price,
    required this.onBuy,
  });

  final String credits;
  final String price;
  final VoidCallback onBuy;

  @override
  Widget build(BuildContext context) {
    return Stack(
      clipBehavior: Clip.none,
      children: [
        Container(
          margin:
              const EdgeInsets.symmetric(horizontal: AppSpacing.screenPadding),
          padding: const EdgeInsets.symmetric(
            horizontal: AppSpacing.xxl,
            vertical: AppSpacing.xl,
          ),
          decoration: BoxDecoration(
            color: AppColors.surface,
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: AppColors.border),
            boxShadow: [
              BoxShadow(
                color: AppColors.shadowLight,
                blurRadius: 6,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    credits,
                    style: AppTypography.bodyLarge.copyWith(
                      color: AppColors.textPrimary,
                    ),
                  ),
                  const SizedBox(height: AppSpacing.sm),
                  Text(
                    price,
                    style: AppTypography.bodyRegular.copyWith(
                      color: AppColors.textSecondary,
                    ),
                  ),
                ],
              ),
              _BuyButton(onTap: onBuy),
            ],
          ),
        ),
        Positioned(
          top: 0,
          right: AppSpacing.screenPadding,
          child: Container(
            padding: const EdgeInsets.symmetric(
              horizontal: AppSpacing.md,
              vertical: AppSpacing.xs,
            ),
            decoration: BoxDecoration(
              color: AppColors.accentOrangeLight,
              borderRadius: const BorderRadius.only(
                topRight: Radius.circular(16),
                bottomLeft: Radius.circular(16),
              ),
            ),
            child: Text(
              'Most Popular',
              style: AppTypography.label.copyWith(
                color: AppColors.accentOrange,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
        ),
      ],
    );
  }
}

class _BuyButton extends StatelessWidget {
  const _BuyButton({required this.onTap});

  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.xl,
          vertical: AppSpacing.md,
        ),
        decoration: BoxDecoration(
          color: AppColors.primary,
          borderRadius: BorderRadius.circular(12),
        ),
        child: Text(
          'Buy',
          style: AppTypography.bodyRegular.copyWith(
            color: AppColors.surface,
            fontWeight: FontWeight.w600,
          ),
        ),
      ),
    );
  }
}