import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:real_estate_mobile/core/constants/app_colors.dart';
import 'package:real_estate_mobile/core/network/api_client.dart';
import 'package:real_estate_mobile/core/widgets/s3_image.dart';

// ── Data models (matching web CMS types) ──

class _AboutHero {
  final String badge;
  final String headline;
  final String description;
  final String ctaButtonText;
  final String bannerImageUrl;
  final String bannerOverlayText;

  const _AboutHero({
    this.badge = 'Our Mission',
    this.headline = 'Connecting You with Trusted Agents.',
    this.description =
        'We believe finding the right home shouldn\u2019t be complicated. Our platform bridges the gap between buyers, sellers, and verified real estate agents for a smooth and transparent experience.',
    this.ctaButtonText = 'Find Your Agent',
    this.bannerImageUrl = '',
    this.bannerOverlayText = 'Building the future of property.',
  });

  factory _AboutHero.fromJson(Map<String, dynamic> json) {
    return _AboutHero(
      badge: json['badge'] as String? ?? 'Our Mission',
      headline: json['headline'] as String? ?? 'Connecting You with Trusted Agents.',
      description: json['description'] as String? ??
          'We believe finding the right home shouldn\u2019t be complicated. Our platform bridges the gap between buyers, sellers, and verified real estate agents for a smooth and transparent experience.',
      ctaButtonText: json['ctaButtonText'] as String? ?? 'Find Your Agent',
      bannerImageUrl: json['bannerImageUrl'] as String? ?? '',
      bannerOverlayText: json['bannerOverlayText'] as String? ?? 'Building the future of property.',
    );
  }
}

class _AboutStatItem {
  final String value;
  final String label;

  const _AboutStatItem({required this.value, required this.label});

  factory _AboutStatItem.fromJson(Map<String, dynamic> json) {
    return _AboutStatItem(
      value: json['value'] as String? ?? '',
      label: json['label'] as String? ?? '',
    );
  }
}

class _AboutFeatureItem {
  final String iconPath;
  final String title;
  final String description;

  const _AboutFeatureItem({
    required this.iconPath,
    required this.title,
    required this.description,
  });

  factory _AboutFeatureItem.fromJson(Map<String, dynamic> json) {
    return _AboutFeatureItem(
      iconPath: json['iconPath'] as String? ?? '',
      title: json['title'] as String? ?? '',
      description: json['description'] as String? ?? '',
    );
  }
}

class _AboutTeamMember {
  final String name;
  final String role;
  final String imageUrl;

  const _AboutTeamMember({
    required this.name,
    required this.role,
    required this.imageUrl,
  });

  factory _AboutTeamMember.fromJson(Map<String, dynamic> json) {
    return _AboutTeamMember(
      name: json['name'] as String? ?? '',
      role: json['role'] as String? ?? '',
      imageUrl: json['imageUrl'] as String? ?? '',
    );
  }
}

class _AboutCta {
  final String title;
  final String description;
  final String buttonText;

  const _AboutCta({
    this.title = 'Ready to find a agent',
    this.description =
        'Search and connect with verified real estate agents who match your needs, location, and goals.',
    this.buttonText = 'Find Agents Now',
  });

  factory _AboutCta.fromJson(Map<String, dynamic> json) {
    return _AboutCta(
      title: json['title'] as String? ?? 'Ready to find a agent',
      description: json['description'] as String? ??
          'Search and connect with verified real estate agents who match your needs, location, and goals.',
      buttonText: json['buttonText'] as String? ?? 'Find Agents Now',
    );
  }
}

// ── Defaults ──

const _defaultStats = [
  _AboutStatItem(value: '15k+', label: 'Verified Agents'),
  _AboutStatItem(value: '98%', label: 'Customer Satisfaction'),
];

const _defaultFeatures = [
  _AboutFeatureItem(
    iconPath: '',
    title: 'Verified Agents',
    description:
        'All agents on our platform are carefully verified to ensure trust, proven expertise, and consistent service, helping users connect with reliable professionals and enjoy a smooth, confident, and transparent property journey',
  ),
  _AboutFeatureItem(
    iconPath: '',
    title: 'Total Transparency',
    description:
        'We maintain complete transparency by clearly displaying agent details, reviews, and activity, allowing users to make informed decisions with confidence, clarity, and trust throughout their entire property journey.',
  ),
  _AboutFeatureItem(
    iconPath: '',
    title: 'Simple Journey',
    description:
        'Our platform simplifies every step of the property process, from discovering the right agent to closing with confidence, making the experience smooth, fast, and stress-free for users at every stage.',
  ),
];

const _defaultTeamMembers = [
  _AboutTeamMember(name: 'Andrew', role: 'Founder & CEO', imageUrl: 'asset://professional-1'),
  _AboutTeamMember(name: 'Thomas', role: 'Co-Founder', imageUrl: 'asset://professional-2'),
  _AboutTeamMember(name: 'Darren', role: 'Advisor', imageUrl: 'asset://professional-3'),
];

// ── State ──

class _AboutState {
  final bool isLoading;
  final _AboutHero hero;
  final List<_AboutStatItem> stats;
  final String featuresBadge;
  final List<_AboutFeatureItem> features;
  final String teamTitle;
  final String teamSubtitle;
  final List<_AboutTeamMember> teamMembers;
  final _AboutCta cta;
  final int activeTeamIndex;

  const _AboutState({
    this.isLoading = true,
    this.hero = const _AboutHero(),
    this.stats = _defaultStats,
    this.featuresBadge = 'Why Choose Us',
    this.features = _defaultFeatures,
    this.teamTitle = 'Meet the minds behind the platform',
    this.teamSubtitle =
        'We are a team of passionate innovators, real estate experts, and designers working together to redefine how people connect with trusted agents.',
    this.teamMembers = _defaultTeamMembers,
    this.cta = const _AboutCta(),
    this.activeTeamIndex = 0,
  });

  _AboutState copyWith({
    bool? isLoading,
    _AboutHero? hero,
    List<_AboutStatItem>? stats,
    String? featuresBadge,
    List<_AboutFeatureItem>? features,
    String? teamTitle,
    String? teamSubtitle,
    List<_AboutTeamMember>? teamMembers,
    _AboutCta? cta,
    int? activeTeamIndex,
  }) {
    return _AboutState(
      isLoading: isLoading ?? this.isLoading,
      hero: hero ?? this.hero,
      stats: stats ?? this.stats,
      featuresBadge: featuresBadge ?? this.featuresBadge,
      features: features ?? this.features,
      teamTitle: teamTitle ?? this.teamTitle,
      teamSubtitle: teamSubtitle ?? this.teamSubtitle,
      teamMembers: teamMembers ?? this.teamMembers,
      cta: cta ?? this.cta,
      activeTeamIndex: activeTeamIndex ?? this.activeTeamIndex,
    );
  }
}

// ── Provider ──

class _AboutNotifier extends StateNotifier<_AboutState> {
  _AboutNotifier() : super(const _AboutState()) {
    _load();
  }

  Future<void> _load() async {
    try {
      final response = await ApiClient.instance.dio.get('/cms/page/about');
      final data = response.data['data'] as List<dynamic>?;
      if (data != null) {
        for (final record in data) {
          final map = record as Map<String, dynamic>;
          final sectionKey = map['sectionKey'] as String?;
          final content = map['content'] as Map<String, dynamic>?;
          if (content == null) continue;

          switch (sectionKey) {
            case 'hero':
              if (content['headline'] != null || content['description'] != null) {
                state = state.copyWith(hero: _AboutHero.fromJson(content));
              }
            case 'stats':
              final statsList = content['stats'] as List<dynamic>?;
              if (statsList != null && statsList.isNotEmpty) {
                state = state.copyWith(
                  stats: statsList
                      .map((e) => _AboutStatItem.fromJson(e as Map<String, dynamic>))
                      .toList(),
                );
              }
            case 'features':
              final badge = content['badge'] as String?;
              final featuresList = content['features'] as List<dynamic>?;
              if (badge != null) {
                state = state.copyWith(featuresBadge: badge);
              }
              if (featuresList != null && featuresList.isNotEmpty) {
                state = state.copyWith(
                  features: featuresList
                      .map((e) => _AboutFeatureItem.fromJson(e as Map<String, dynamic>))
                      .toList(),
                );
              }
            case 'team':
              final title = content['title'] as String?;
              final subtitle = content['subtitle'] as String?;
              final membersList = content['members'] as List<dynamic>?;
              if (title != null) state = state.copyWith(teamTitle: title);
              if (subtitle != null) state = state.copyWith(teamSubtitle: subtitle);
              if (membersList != null && membersList.isNotEmpty) {
                state = state.copyWith(
                  teamMembers: membersList
                      .map((e) => _AboutTeamMember.fromJson(e as Map<String, dynamic>))
                      .toList(),
                );
              }
            case 'cta':
              if (content['title'] != null || content['description'] != null) {
                state = state.copyWith(cta: _AboutCta.fromJson(content));
              }
          }
        }
      }
    } catch (_) {
      // Fall through to defaults
    }

    state = state.copyWith(isLoading: false);
  }

  void setActiveTeamIndex(int index) {
    state = state.copyWith(activeTeamIndex: index);
  }
}

final _aboutProvider =
    StateNotifierProvider.autoDispose<_AboutNotifier, _AboutState>((ref) {
  return _AboutNotifier();
});

// ── Feature icon mapping (fallback when CMS has no iconPath) ──

const _featureIconFallback = <String, IconData>{
  'Verified Agents': Icons.verified,
  'Total Transparency': Icons.lock_outline,
  'Simple Journey': Icons.check_circle_outline,
};

// ── Screen ──

class AboutScreen extends ConsumerWidget {
  const AboutScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(_aboutProvider);

    if (state.isLoading) {
      return const Center(
        child: CircularProgressIndicator(
          color: AppColors.accentOrange,
        ),
      );
    }

    return SingleChildScrollView(
      physics: const AlwaysScrollableScrollPhysics(),
      child: Column(
        children: [
          const SizedBox(height: 18),
          _buildHeroTitle(state.hero.headline),
          const SizedBox(height: 16),
          _buildHeroSubtitle(state.hero.description),
          const SizedBox(height: 24),
          _buildBannerImage(state.hero.bannerImageUrl),
          const SizedBox(height: 10),
          _buildBannerCaption(state.hero.bannerOverlayText),
          const SizedBox(height: 16),
          _buildStatsRow(state.stats),
          const SizedBox(height: 32),
          _buildSectionTitle(state.featuresBadge),
          const SizedBox(height: 12),
          _buildWhyChooseUsSubtitle(),
          const SizedBox(height: 24),
          ...state.features.map((f) => Padding(
                padding: const EdgeInsets.only(bottom: 15),
                child: _buildFeatureCard(f),
              )),
          const SizedBox(height: 25),
          _buildTeamSection(context, ref, state),
          const SizedBox(height: 40),
          _buildCtaSection(context, state.cta),
          const SizedBox(height: 30),
        ],
      ),
    );
  }

  // -- Hero Title --
  Widget _buildHeroTitle(String text) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      child: Text(
        text,
        textAlign: TextAlign.center,
        style: const TextStyle(
          fontFamily: 'Fractul',
          fontSize: 25,
          fontWeight: FontWeight.w700,
          color: AppColors.primaryDark,
        ),
      ),
    );
  }

  // -- Hero Subtitle --
  Widget _buildHeroSubtitle(String text) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      child: Text(
        text,
        textAlign: TextAlign.center,
        style: const TextStyle(
          fontFamily: 'SourceSerif4',
          fontSize: 14,
          fontWeight: FontWeight.w500,
          color: AppColors.primaryDark,
        ),
      ),
    );
  }

  // -- Banner Image (from CMS or fallback to local asset) --
  Widget _buildBannerImage(String imageUrl) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 57),
      child: ClipRRect(
        borderRadius: BorderRadius.circular(15),
        child: SizedBox(
          height: 295,
          width: double.infinity,
          child: imageUrl.isNotEmpty
              ? S3Image(
                  imageUrl: imageUrl,
                  height: 295,
                  fit: BoxFit.cover,
                  errorWidget: (context) => Image.asset(
                    'assets/images/about_cityscape.png',
                    height: 295,
                    width: double.infinity,
                    fit: BoxFit.cover,
                  ),
                )
              : Image.asset(
                  'assets/images/about_cityscape.png',
                  height: 295,
                  width: double.infinity,
                  fit: BoxFit.cover,
                ),
        ),
      ),
    );
  }

  // -- Banner Caption --
  Widget _buildBannerCaption(String text) {
    return Center(
      child: Text(
        text,
        textAlign: TextAlign.center,
        style: const TextStyle(
          fontFamily: 'Fractul',
          fontSize: 14,
          fontWeight: FontWeight.w500,
          color: AppColors.primaryDark,
        ),
      ),
    );
  }

  // -- Stats Row (dynamic) --
  Widget _buildStatsRow(List<_AboutStatItem> stats) {
    if (stats.isEmpty) return const SizedBox.shrink();
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceAround,
        children: stats.map((s) => _buildStatItem(s.value, s.label)).toList(),
      ),
    );
  }

  Widget _buildStatItem(String value, String label) {
    return Column(
      children: [
        Text(
          value,
          style: const TextStyle(
            fontFamily: 'Fractul',
            fontSize: 14,
            fontWeight: FontWeight.w500,
            color: AppColors.accentOrange,
          ),
        ),
        const SizedBox(height: 2),
        Text(
          label,
          style: const TextStyle(
            fontFamily: 'SourceSerif4',
            fontSize: 14,
            fontWeight: FontWeight.w400,
            color: AppColors.primaryDark,
          ),
        ),
      ],
    );
  }

  // -- Section Title --
  Widget _buildSectionTitle(String text) {
    return Center(
      child: Text(
        text,
        textAlign: TextAlign.center,
        style: const TextStyle(
          fontFamily: 'Fractul',
          fontSize: 25,
          fontWeight: FontWeight.w700,
          color: AppColors.primaryDark,
        ),
      ),
    );
  }

  // -- Why Choose Us Subtitle --
  Widget _buildWhyChooseUsSubtitle() {
    return const Padding(
      padding: EdgeInsets.symmetric(horizontal: 65),
      child: Text(
        'Our core principles guide every interaction, ensuring you feel confident and supported at every step.',
        textAlign: TextAlign.center,
        style: TextStyle(
          fontFamily: 'SourceSerif4',
          fontSize: 14,
          fontWeight: FontWeight.w400,
          color: AppColors.primaryDark,
        ),
      ),
    );
  }

  // -- Feature Card (dynamic with S3 icon support) --
  Widget _buildFeatureCard(_AboutFeatureItem feature) {
    final fallbackIcon = _featureIconFallback[feature.title] ?? Icons.star_outline;

    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 57),
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 24),
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(15),
          border: Border.all(
            color: AppColors.primaryDark.withValues(alpha: 0.1),
            width: 0.1,
          ),
        ),
        child: Column(
          children: [
            if (feature.iconPath.isNotEmpty)
              SizedBox(
                width: 36,
                height: 36,
                child: S3Image(
                  imageUrl: feature.iconPath,
                  width: 36,
                  height: 36,
                  fit: BoxFit.contain,
                  errorWidget: (_) => Icon(
                    fallbackIcon,
                    size: 36,
                    color: AppColors.accentOrange,
                  ),
                ),
              )
            else
              Icon(
                fallbackIcon,
                size: 36,
                color: AppColors.accentOrange,
              ),
            const SizedBox(height: 10),
            Text(
              feature.title,
              textAlign: TextAlign.center,
              style: const TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w700,
                color: AppColors.primaryDark,
              ),
            ),
            const SizedBox(height: 8),
            Text(
              feature.description,
              textAlign: TextAlign.center,
              style: const TextStyle(
                fontFamily: 'SourceSerif4',
                fontSize: 14,
                fontWeight: FontWeight.w400,
                color: AppColors.primaryDark,
                height: 1.5,
              ),
            ),
          ],
        ),
      ),
    );
  }

  // -- Team Section (dynamic with carousel) --
  Widget _buildTeamSection(
    BuildContext context,
    WidgetRef ref,
    _AboutState state,
  ) {
    final members = state.teamMembers;
    if (members.isEmpty) return const SizedBox.shrink();

    final activeIndex = state.activeTeamIndex.clamp(0, members.length - 1);
    final screenWidth = MediaQuery.of(context).size.width;
    final cardWidth = screenWidth - (69 * 2);

    return Column(
      children: [
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 57),
          child: Text(
            state.teamTitle,
            textAlign: TextAlign.center,
            style: const TextStyle(
              fontFamily: 'Fractul',
              fontSize: 25,
              fontWeight: FontWeight.w700,
              color: AppColors.primaryDark,
            ),
          ),
        ),
        const SizedBox(height: 16),
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 57),
          child: Text(
            state.teamSubtitle,
            textAlign: TextAlign.center,
            style: const TextStyle(
              fontFamily: 'SourceSerif4',
              fontSize: 14,
              fontWeight: FontWeight.w400,
              color: AppColors.primaryDark,
            ),
          ),
        ),
        const SizedBox(height: 40),
        // Team carousel
        SizedBox(
          height: 330,
          child: PageView.builder(
            itemCount: members.length,
            controller: PageController(
              viewportFraction: cardWidth / screenWidth,
            ),
            onPageChanged: (index) {
              ref.read(_aboutProvider.notifier).setActiveTeamIndex(index);
            },
            itemBuilder: (context, index) {
              final member = members[index];
              return Padding(
                padding: const EdgeInsets.symmetric(horizontal: 4),
                child: Container(
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(15),
                    border: Border.all(
                      color: AppColors.primaryDark.withValues(alpha: 0.1),
                      width: 0.1,
                    ),
                  ),
                  child: Column(
                    children: [
                      const SizedBox(height: 19),
                      Padding(
                        padding: const EdgeInsets.symmetric(horizontal: 16),
                        child: ClipRRect(
                          borderRadius: BorderRadius.circular(15),
                          child: SizedBox(
                            height: 211,
                            width: double.infinity,
                            child: _buildTeamMemberImage(member.imageUrl),
                          ),
                        ),
                      ),
                      const SizedBox(height: 16),
                      Text(
                        member.name,
                        textAlign: TextAlign.center,
                        style: const TextStyle(
                          fontFamily: 'Fractul',
                          fontSize: 14,
                          fontWeight: FontWeight.w700,
                          color: Colors.black,
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        member.role,
                        textAlign: TextAlign.center,
                        style: const TextStyle(
                          fontFamily: 'Fractul',
                          fontSize: 14,
                          fontWeight: FontWeight.w300,
                          color: Colors.black,
                        ),
                      ),
                    ],
                  ),
                ),
              );
            },
          ),
        ),
        const SizedBox(height: 16),
        // Page indicator
        if (members.length > 1)
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 58),
            child: LayoutBuilder(
              builder: (context, constraints) {
                final totalWidth = constraints.maxWidth;
                final segmentWidth = totalWidth / members.length;
                return Stack(
                  children: [
                    Container(
                      height: 5,
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(15),
                        border: Border.all(
                          color: AppColors.primaryDark.withValues(alpha: 0.1),
                          width: 0.1,
                        ),
                      ),
                    ),
                    AnimatedPositioned(
                      duration: const Duration(milliseconds: 200),
                      left: segmentWidth * activeIndex,
                      child: Container(
                        height: 5,
                        width: segmentWidth,
                        decoration: BoxDecoration(
                          color: AppColors.primaryDark,
                          borderRadius: BorderRadius.circular(15),
                        ),
                      ),
                    ),
                  ],
                );
              },
            ),
          ),
      ],
    );
  }

  // -- Team member image (handles asset://, S3 keys, and URLs) --
  Widget _buildTeamMemberImage(String imageUrl) {
    const placeholder = _TeamMemberPlaceholder();

    if (imageUrl.isEmpty) return placeholder;

    // Local asset images (defaults)
    if (imageUrl.startsWith('asset://')) {
      final name = imageUrl.replaceFirst('asset://', '');
      return Image.asset(
        'assets/images/$name.jpg',
        height: 211,
        width: double.infinity,
        fit: BoxFit.cover,
        errorBuilder: (context, error, stackTrace) => placeholder,
      );
    }

    // S3 key or URL from CMS
    return S3Image(
      imageUrl: imageUrl,
      height: 211,
      fit: BoxFit.cover,
      placeholder: (_) => placeholder,
      errorWidget: (_) => placeholder,
    );
  }

  // -- CTA Section (dynamic) --
  Widget _buildCtaSection(BuildContext context, _AboutCta cta) {
    return Column(
      children: [
        Text(
          cta.title,
          textAlign: TextAlign.center,
          style: const TextStyle(
            fontFamily: 'Fractul',
            fontSize: 25,
            fontWeight: FontWeight.w700,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 16),
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 83),
          child: Text(
            cta.description,
            textAlign: TextAlign.center,
            style: const TextStyle(
              fontFamily: 'SourceSerif4',
              fontSize: 14,
              fontWeight: FontWeight.w700,
              color: AppColors.primaryDark,
            ),
          ),
        ),
        const SizedBox(height: 24),
        // Illustration
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 34),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(56),
            child: Image.asset(
              'assets/images/about_find_agent.jpg',
              height: 241,
              width: double.infinity,
              fit: BoxFit.cover,
            ),
          ),
        ),
        const SizedBox(height: 24),
        // Find Agents Now button
        GestureDetector(
          onTap: () => context.push('/agents/search'),
          child: Container(
            height: 50,
            width: 210,
            decoration: BoxDecoration(
              color: AppColors.accentOrange,
              borderRadius: BorderRadius.circular(25),
            ),
            alignment: Alignment.center,
            child: Text(
              cta.buttonText,
              style: const TextStyle(
                fontFamily: 'Fractul',
                fontSize: 16,
                fontWeight: FontWeight.w700,
                color: AppColors.primaryDark,
              ),
            ),
          ),
        ),
        const SizedBox(height: 12),
        // Get Help button
        GestureDetector(
          onTap: () => context.push('/contact'),
          child: Container(
            height: 50,
            width: 210,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(25),
              border: Border.all(
                color: AppColors.primaryDark,
                width: 1,
              ),
            ),
            alignment: Alignment.center,
            child: const Text(
              'Get Help',
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 16,
                fontWeight: FontWeight.w700,
                color: AppColors.primaryDark,
              ),
            ),
          ),
        ),
      ],
    );
  }

}

class _TeamMemberPlaceholder extends StatelessWidget {
  const _TeamMemberPlaceholder();

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xFFC4D9D4),
      child: const Center(
        child: Icon(Icons.person, size: 60, color: AppColors.primaryDark),
      ),
    );
  }
}