import 'package:flutter/material.dart';
import 'package:flutter_lucide/flutter_lucide.dart';
import 'package:cached_network_image/cached_network_image.dart';

import '../../core/api/api_config.dart';
import '../../core/api/services/user_api.dart';
import '../../core/auth/auth_service.dart';
import '../../core/theme/app_colors.dart';
import '../../core/user/user_state.dart';
import '../../core/theme/app_spacing.dart';
import '../../core/theme/app_typography.dart';

/// Profile screen - matches Pencil KXeow
class ProfileScreen extends StatefulWidget {
  const ProfileScreen({super.key, required this.isActive});

  final bool isActive;

  @override
  State<ProfileScreen> createState() => _ProfileScreenState();
}

class _ProfileScreenState extends State<ProfileScreen> {
  @override
  void initState() {
    super.initState();
    if (widget.isActive) _fetchAccount();
  }

  @override
  void didUpdateWidget(covariant ProfileScreen oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.isActive && !oldWidget.isActive) {
      _fetchAccount();
    }
  }

  Future<void> _fetchAccount() async {
    final uid = UserState.userId.value;
    if (uid == null || uid.isEmpty) return;
    try {
      await AuthService.loginComplete;
      final res = await UserApi.getAccount(
        sentinel: ApiConfig.appId,
        asset: uid,
      );
      if (!mounted) return;
      if (res.isSuccess && res.data != null) {
        final data = res.data as Map<String, dynamic>?;
        final credits = data?['reveal'] as int?;
        if (credits != null) UserState.setCredits(credits);
        final avatarUrl = data?['realm'] as String?;
        UserState.setAvatar(
            avatarUrl != null && avatarUrl.isNotEmpty ? avatarUrl : null);
        final name = data?['terminal'] as String?;
        UserState.setUserName(
            name != null && name.isNotEmpty ? name : null);
      }
    } catch (_) {}
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      body: SingleChildScrollView(
        padding: const EdgeInsets.fromLTRB(
          AppSpacing.screenPadding,
          AppSpacing.xxl,
          AppSpacing.screenPadding,
          AppSpacing.screenPaddingLarge,
        ),
        child: Column(
          children: [
            ValueListenableBuilder<String?>(
              valueListenable: UserState.avatar,
              builder: (_, avatarUrl, __) {
                return ValueListenableBuilder<String?>(
                  valueListenable: UserState.userName,
                  builder: (_, userName, __) {
                    return ValueListenableBuilder<String?>(
                      valueListenable: UserState.userId,
                      builder: (_, userId, __) {
                        return _ProfileHeader(
                          avatarUrl: avatarUrl,
                          userName: userName,
                          uid: userId,
                        );
                      },
                    );
                  },
                );
              },
            ),
            const SizedBox(height: AppSpacing.xl),
            _BalanceCard(
              balance: UserCreditsData.of(context)?.creditsDisplay ?? '--',
              onRecharge: () => Navigator.of(context).pushNamed('/recharge'),
            ),
            const SizedBox(height: AppSpacing.xxl),
            _MenuSection(
              items: [
                _MenuItem(
                  title: 'Credit Store',
                  icon: LucideIcons.chevron_right,
                  onTap: () => Navigator.of(context).pushNamed('/recharge'),
                ),
                _MenuItem(
                  title: 'Settings',
                  icon: LucideIcons.chevron_right,
                  onTap: () {},
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

class _ProfileHeader extends StatelessWidget {
  const _ProfileHeader({
    this.avatarUrl,
    this.userName,
    this.uid,
  });

  final String? avatarUrl;
  final String? userName;
  final String? uid;

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 220,
      alignment: Alignment.center,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Container(
            width: 80,
            height: 80,
            decoration: BoxDecoration(
              color: AppColors.border,
              borderRadius: BorderRadius.circular(40),
              border: Border.all(
                color: AppColors.primaryLight,
                width: 2,
              ),
            ),
            clipBehavior: Clip.antiAlias,
            child: avatarUrl != null && avatarUrl!.isNotEmpty
                ? CachedNetworkImage(
                    imageUrl: avatarUrl!,
                    fit: BoxFit.cover,
                    placeholder: (_, __) => Icon(
                      LucideIcons.user,
                      size: 40,
                      color: AppColors.textSecondary,
                    ),
                    errorWidget: (_, __, ___) => Icon(
                      LucideIcons.user,
                      size: 40,
                      color: AppColors.textSecondary,
                    ),
                  )
                : Icon(
                    LucideIcons.user,
                    size: 40,
                    color: AppColors.textSecondary,
                  ),
          ),
          const SizedBox(height: AppSpacing.lg),
          Text(
            userName ?? 'Guest',
            style: AppTypography.bodyLarge.copyWith(
              color: AppColors.textPrimary,
            ),
          ),
          const SizedBox(height: AppSpacing.lg),
          Container(
            padding: const EdgeInsets.symmetric(
              horizontal: AppSpacing.lg,
              vertical: AppSpacing.sm,
            ),
            decoration: BoxDecoration(
              color: AppColors.surfaceAlt,
              borderRadius: BorderRadius.circular(16),
              border: Border.all(color: AppColors.border),
            ),
            child: Text(
              uid != null && uid!.isNotEmpty ? 'UID $uid' : 'UID --',
              style: AppTypography.caption.copyWith(
                color: AppColors.textSecondary,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _BalanceCard extends StatelessWidget {
  const _BalanceCard({
    required this.balance,
    required this.onRecharge,
  });

  final String balance;
  final VoidCallback onRecharge;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(
        horizontal: AppSpacing.xxl,
        vertical: AppSpacing.xl,
      ),
      decoration: BoxDecoration(
        color: AppColors.surface,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: AppColors.shadowLight,
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                'AVAILABLE BALANCE',
                style: AppTypography.label.copyWith(
                  color: AppColors.textSecondary,
                ),
              ),
              const SizedBox(height: AppSpacing.sm),
              Text(
                balance,
                style: AppTypography.bodyLarge.copyWith(
                  fontSize: 24,
                  fontWeight: FontWeight.w700,
                  color: AppColors.primary,
                ),
              ),
            ],
          ),
          GestureDetector(
            onTap: onRecharge,
            child: Container(
              padding: const EdgeInsets.symmetric(
                horizontal: 14,
                vertical: AppSpacing.md,
              ),
              decoration: BoxDecoration(
                color: AppColors.primary,
                borderRadius: BorderRadius.circular(12),
              ),
              child: Text(
                'Recharge',
                style: AppTypography.bodyRegular.copyWith(
                  color: AppColors.surface,
                  fontWeight: FontWeight.w600,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _MenuSection extends StatelessWidget {
  const _MenuSection({required this.items});

  final List<_MenuItem> items;

  @override
  Widget build(BuildContext context) {
    return Column(
      children: items
          .map(
            (item) => Padding(
              padding: const EdgeInsets.only(bottom: AppSpacing.md),
              child: _MenuItem(
                title: item.title,
                icon: item.icon,
                onTap: item.onTap,
              ),
            ),
          )
          .toList(),
    );
  }
}

class _MenuItem extends StatelessWidget {
  const _MenuItem({
    required this.title,
    required this.icon,
    required this.onTap,
  });

  final String title;
  final IconData icon;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.xl,
          vertical: 14,
        ),
        decoration: BoxDecoration(
          color: AppColors.surface,
          borderRadius: BorderRadius.circular(12),
          boxShadow: [
            BoxShadow(
              color: AppColors.shadowLight,
              blurRadius: 6,
              offset: const Offset(0, 2),
            ),
          ],
        ),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(
              title,
              style: AppTypography.bodyRegular.copyWith(
                color: AppColors.textPrimary,
              ),
            ),
            Icon(icon, size: 20, color: AppColors.textMuted),
          ],
        ),
      ),
    );
  }
}