import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:intl/intl.dart';
import 'package:share_plus/share_plus.dart';

import '../../../core/constants/design_system.dart';
import '../../../domain/entities/social_post.dart';
import '../widgets/custom_snackbar.dart';

/// Widget d'en-tête pour les posts sociaux avec design moderne.
///
/// Affiche l'avatar, le nom de l'utilisateur, le timestamp et les options.
class SocialHeaderWidget extends StatelessWidget {
  const SocialHeaderWidget({
    required this.post,
    required this.onEditPost,
    required this.onClosePost,
    required this.menuKey,
    required this.menuContext,
    this.showVerifiedBadge = false,
    super.key,
  });

  final SocialPost post;
  final VoidCallback onEditPost;
  final VoidCallback onClosePost;
  final GlobalKey menuKey;
  final BuildContext menuContext;
  final bool showVerifiedBadge;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Row(
      children: [
        // Avatar avec bordure gradient (style Instagram)
        _buildAvatar(theme),
        const SizedBox(width: DesignSystem.spacingMd),

        // Informations utilisateur
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              // Nom avec badge de vérification
              Row(
                children: [
                  Flexible(
                    child: Text(
                      post.authorFullName,
                      style: theme.textTheme.bodyMedium?.copyWith(
                        fontWeight: FontWeight.w600,
                        fontSize: 14,
                        letterSpacing: -0.2,
                      ),
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                  if (showVerifiedBadge) ...[
                    const SizedBox(width: 4),
                    Icon(
                      Icons.verified,
                      size: 16,
                      color: theme.colorScheme.primary,
                    ),
                  ],
                ],
              ),

              // Timestamp
              const SizedBox(height: 2),
              Text(
                _formatTimestamp(post.timestamp),
                style: theme.textTheme.bodySmall?.copyWith(
                  color: theme.colorScheme.onSurface.withOpacity(0.5),
                  fontSize: 12,
                  height: 1.2,
                ),
              ),
            ],
          ),
        ),

        // Menu options
        IconButton(
          key: menuKey,
          icon: const Icon(Icons.more_horiz_rounded),
          iconSize: 22,
          onPressed: () => _showOptionsMenu(menuContext),
          color: theme.colorScheme.onSurface.withOpacity(0.6),
          padding: EdgeInsets.zero,
          constraints: const BoxConstraints(minWidth: 36, minHeight: 36),
        ),
      ],
    );
  }

  /// Construit l'avatar avec bordure dégradée
  Widget _buildAvatar(ThemeData theme) {
    return Container(
      decoration: BoxDecoration(
        shape: BoxShape.circle,
        gradient: LinearGradient(
          colors: [
            theme.colorScheme.primary.withOpacity(0.3),
            theme.colorScheme.secondary.withOpacity(0.3),
          ],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        boxShadow: [
          BoxShadow(
            color: theme.colorScheme.primary.withOpacity(0.1),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      padding: const EdgeInsets.all(2),
      child: Container(
        decoration: BoxDecoration(
          shape: BoxShape.circle,
          color: theme.scaffoldBackgroundColor,
        ),
        padding: const EdgeInsets.all(2),
        child: CircleAvatar(
          radius: 18,
          backgroundColor: theme.colorScheme.surfaceVariant,
          backgroundImage: _getProfileImage(),
          child: _getProfileImage() == null
              ? Icon(
                  Icons.person_rounded,
                  size: 20,
                  color: theme.colorScheme.onSurfaceVariant,
                )
              : null,
        ),
      ),
    );
  }

  /// Récupère l'image de profil de l'utilisateur
  ImageProvider? _getProfileImage() {
    if (post.userProfileImageUrl.isEmpty) {
      return null;
    }
    if (post.userProfileImageUrl.startsWith('http://') ||
        post.userProfileImageUrl.startsWith('https://')) {
      return NetworkImage(post.userProfileImageUrl);
    }
    return AssetImage(post.userProfileImageUrl);
  }

  /// Formate le timestamp de manière relative
  String _formatTimestamp(DateTime timestamp) {
    final now = DateTime.now();
    final difference = now.difference(timestamp);

    if (difference.inSeconds < 60) {
      return 'À l\'instant';
    } else if (difference.inMinutes < 60) {
      return 'Il y a ${difference.inMinutes} min';
    } else if (difference.inHours < 24) {
      return 'Il y a ${difference.inHours}h';
    } else if (difference.inDays < 7) {
      return 'Il y a ${difference.inDays}j';
    } else if (difference.inDays < 30) {
      final weeks = (difference.inDays / 7).floor();
      return 'Il y a ${weeks}sem';
    } else {
      return DateFormat('d MMM', 'fr_FR').format(timestamp);
    }
  }

  /// Affiche le menu des options
  void _showOptionsMenu(BuildContext context) {
    showModalBottomSheet<void>(
      context: context,
      backgroundColor: Colors.transparent,
      builder: (context) {
        final theme = Theme.of(context);
        return Container(
          decoration: BoxDecoration(
            color: theme.scaffoldBackgroundColor,
            borderRadius: const BorderRadius.vertical(
              top: Radius.circular(DesignSystem.radiusLg),
            ),
          ),
          child: SafeArea(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                // Handle
                Container(
                  margin: const EdgeInsets.only(
                    top: DesignSystem.spacingMd,
                    bottom: DesignSystem.spacingSm,
                  ),
                  width: 40,
                  height: 4,
                  decoration: BoxDecoration(
                    color: theme.colorScheme.onSurface.withOpacity(0.2),
                    borderRadius: BorderRadius.circular(2),
                  ),
                ),

                // Options
                _buildMenuOption(
                  context,
                  theme,
                  Icons.edit_outlined,
                  'Modifier',
                  onEditPost,
                ),
                _buildMenuOption(
                  context,
                  theme,
                  Icons.link_rounded,
                  'Copier le lien',
                  () {
                    _copyPostLink(context);
                  },
                ),
                _buildMenuOption(
                  context,
                  theme,
                  Icons.share_outlined,
                  'Partager',
                  () {
                    _sharePost(context);
                  },
                ),
                Divider(
                  height: 1,
                  thickness: 1,
                  color: theme.dividerColor.withOpacity(0.5),
                ),
                _buildMenuOption(
                  context,
                  theme,
                  Icons.report_outlined,
                  'Signaler',
                  () {
                    _reportPost(context);
                  },
                  isDestructive: false,
                  textColor: theme.colorScheme.error,
                ),

                const SizedBox(height: DesignSystem.spacingSm),
              ],
            ),
          ),
        );
      },
    );
  }

  /// Construit une option du menu
  Widget _buildMenuOption(
    BuildContext context,
    ThemeData theme,
    IconData icon,
    String title,
    VoidCallback onTap, {
    bool isDestructive = false,
    Color? textColor,
  }) {
    final color = textColor ?? (isDestructive ? theme.colorScheme.error : null);

    return ListTile(
      leading: Icon(
        icon,
        color: color,
        size: 22,
      ),
      title: Text(
        title,
        style: theme.textTheme.bodyMedium?.copyWith(
          color: color,
          fontSize: 14,
        ),
      ),
      onTap: () {
        Navigator.of(context).pop();
        onTap();
      },
      contentPadding: const EdgeInsets.symmetric(
        horizontal: DesignSystem.spacingLg,
        vertical: DesignSystem.spacingXs,
      ),
    );
  }

  /// Copie le lien du post dans le presse-papiers
  void _copyPostLink(BuildContext context) {
    final postUrl = 'https://afterwork.app/post/${post.id}';
    Clipboard.setData(ClipboardData(text: postUrl));
    context.showSuccess('Lien copié dans le presse-papiers');
  }

  /// Partage le post via la fonctionnalité native de partage
  Future<void> _sharePost(BuildContext context) async {
    try {
      final postUrl = 'https://afterwork.app/post/${post.id}';
      final shareText = '${post.content}\n\n$postUrl';

      await Share.share(
        shareText,
        subject: 'Publication AfterWork',
      );
    } catch (e) {
      if (context.mounted) {
        context.showError('Erreur lors du partage');
      }
    }
  }

  /// Affiche le dialog de signalement
  void _reportPost(BuildContext context) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Signaler ce post'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              'Pourquoi signalez-vous ce post ?',
              style: TextStyle(fontWeight: FontWeight.w600),
            ),
            const SizedBox(height: DesignSystem.spacingMd),
            _buildReportOption(context, 'Contenu inapproprié'),
            _buildReportOption(context, 'Spam ou arnaque'),
            _buildReportOption(context, 'Harcèlement'),
            _buildReportOption(context, 'Fausses informations'),
            _buildReportOption(context, 'Autre'),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('Annuler'),
          ),
        ],
      ),
    );
  }

  /// Construit une option de signalement
  Widget _buildReportOption(BuildContext context, String reason) {
    return InkWell(
      onTap: () {
        Navigator.of(context).pop();
        _submitReport(context, reason);
      },
      child: Padding(
        padding: const EdgeInsets.symmetric(
          vertical: DesignSystem.spacingSm,
          horizontal: DesignSystem.spacingXs,
        ),
        child: Row(
          children: [
            Icon(
              Icons.report_outlined,
              size: 20,
              color: Theme.of(context).colorScheme.error.withOpacity(0.7),
            ),
            const SizedBox(width: DesignSystem.spacingMd),
            Text(
              reason,
              style: Theme.of(context).textTheme.bodyMedium,
            ),
          ],
        ),
      ),
    );
  }

  /// Soumet le signalement
  Future<void> _submitReport(BuildContext context, String reason) async {
    // Simuler l'envoi du signalement
    // Dans une vraie application, cela ferait un appel API
    await Future.delayed(const Duration(milliseconds: 500));

    if (context.mounted) {
      context.showSuccess('Signalement envoyé. Merci pour votre contribution.');
    }
  }
}