import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:provider/provider.dart';
import 'package:url_launcher/url_launcher.dart';
import '../../providers/app_settings_provider.dart';
import '../../providers/installer_mode_provider.dart';
import '../../providers/navigation_provider.dart';
import '../../services/connection_manager.dart';
import '../../services/nymea_service.dart';
import '../../theme/etm_tokens.dart';
import 'installer_pin_dialog.dart';

// ─────────────────────────────────────────────────────────────────────────────
//  MainDrawer — drawer custom qui glisse sur le contenu
//
//  Pas de Drawer Flutter standard. L'overlay est géré dans MainShell via Stack :
//  1. Couche sombre (GestureDetector → closeDrawer)
//  2. DrawerPanel animé (Transform.translate)
// ─────────────────────────────────────────────────────────────────────────────

/// Route associée à chaque `AppScreen.id` de [AppSettingsProvider].
/// Un id absent de cette table n'est jamais affiché dans le drawer.
const Map<String, String> kScreenRoutes = {
  'dashboard': '/',
  'energy':    '/energy',
  'things':    '/things',
  'favorites': '/favorites',
  'groups':    '/groups',
  'scenes':    '/scenes',
  'media':     '/media',
  'garages':   '/garages',
  'ac':        '/ac',
};

/// Couche sombre cliquable qui ferme le drawer.
class DrawerScrim extends StatelessWidget {
  const DrawerScrim({super.key});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => context.read<NavigationProvider>().closeDrawer(),
      child: Container(color: Colors.black.withValues(alpha: 0.45)),
    );
  }
}

/// Panel du drawer (largeur fixe, fond sombre ETM).
class DrawerPanel extends StatelessWidget {
  const DrawerPanel({super.key});

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: 320,
      child: Material(
        color: EtmTokens.navy,
        child: SafeArea(
          child: Column(
            children: [
              // ── En-tête ────────────────────────────────────────────────────
              _DrawerHeader(),
              // ── Menu ──────────────────────────────────────────────────────
              Expanded(
                child: _DrawerMenu(),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// ── En-tête du drawer ─────────────────────────────────────────────────────────
class _DrawerHeader extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final service   = context.watch<NymeaService>();
    final installer = context.watch<InstallerModeProvider>();
    final manager   = context.watch<ConnectionManager>();

    // Nom de l'installation active : box réelle > identité Hello > démo.
    final boxName = service.isSimulation
        ? 'Mode démo'
        : (manager.active?.name ??
            (service.serverName.isNotEmpty
                ? service.serverName
                : 'Non connecté'));

    return Container(
      padding: const EdgeInsets.fromLTRB(20, 18, 16, 18),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [EtmTokens.navy, EtmTokens.navy2],
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // ── Logo + statut connexion ──────────────────────────────────────
          Row(
            children: [
              Container(
                width: 44, height: 44,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(13),
                  gradient: const LinearGradient(
                    colors: [EtmTokens.blue, Color(0xFF1F7FB3)],
                  ),
                ),
                child: const Icon(Icons.bolt, color: Colors.white, size: 24),
              ),
              const SizedBox(width: 10),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text(
                      'ETM PowerSync',
                      style: TextStyle(
                        color: Colors.white,
                        fontWeight: FontWeight.bold,
                        fontSize: 15,
                      ),
                    ),
                    Text(
                      service.isSimulation
                          ? 'Mode simulation'
                          : (service.host),
                      style: EtmTokens.sans(size: 12, color: const Color(0xFFA9C4D3)),
                    ),
                  ],
                ),
              ),
              _ConnectionDot(
                connected: service.connected,
                simulation: service.isSimulation,
              ),
            ],
          ),

          const SizedBox(height: 12),

          // ── Nom de la box active (cliquable → Installations) ─────────────
          // L'en-tête EST l'accès au gestionnaire multi-HEMS (pas d'entrée de
          // menu dédiée) : tap → bascule d'installation.
          GestureDetector(
            onTap: () {
              context.read<NavigationProvider>().closeDrawer();
              context.go('/installations');
            },
            behavior: HitTestBehavior.opaque,
            child: Row(
              children: [
                Flexible(
                  child: Text(
                    boxName,
                    overflow: TextOverflow.ellipsis,
                    style: EtmTokens.sans(
                        size: 15, weight: FontWeight.w600, color: Colors.white),
                  ),
                ),
                const SizedBox(width: 6),
                const Icon(Icons.unfold_more_rounded,
                    size: 16, color: Color(0xFFA9C4D3)),
              ],
            ),
          ),

          const SizedBox(height: 6),

          // ── Utilisateur + badge rôle ─────────────────────────────────────
          Row(
            children: [
              const Icon(Icons.person_outline, size: 16, color: Color(0xFFA9C4D3)),
              const SizedBox(width: 6),
              Text(
                service.username.isNotEmpty ? service.username : 'Utilisateur',
                style: EtmTokens.sans(size: 13, color: const Color(0xFFCFE6F3)),
              ),
              const SizedBox(width: 8),
              _RoleBadge(isInstaller: installer.isUnlocked),
            ],
          ),
        ],
      ),
    );
  }
}

class _ConnectionDot extends StatelessWidget {
  final bool connected;
  final bool simulation;
  const _ConnectionDot(
      {required this.connected, required this.simulation});

  @override
  Widget build(BuildContext context) {
    final Color color = simulation
        ? EtmTokens.amber
        : connected
            ? EtmTokens.green
            : EtmTokens.danger;
    return Container(
      width: 9, height: 9,
      decoration: BoxDecoration(shape: BoxShape.circle, color: color),
    );
  }
}

class _RoleBadge extends StatelessWidget {
  final bool isInstaller;
  const _RoleBadge({required this.isInstaller});

  @override
  Widget build(BuildContext context) {
    final color = isInstaller ? EtmTokens.orange : EtmTokens.blue;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.18),
        borderRadius: BorderRadius.circular(6),
        border: Border.all(color: color.withValues(alpha: 0.5)),
      ),
      child: Text(
        isInstaller ? 'INSTALLATEUR' : 'UTILISATEUR',
        style: EtmTokens.sans(size: 10, weight: FontWeight.w700, color: color, letterSpacing: 0.5),
      ),
    );
  }
}

// ── Menu du drawer ────────────────────────────────────────────────────────────
class _DrawerMenu extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final installer = context.watch<InstallerModeProvider>();
    final settings  = context.watch<AppSettingsProvider>();

    return ListView(
      padding: const EdgeInsets.symmetric(vertical: 8),
      children: [
        // ── VUE PRINCIPALE ────────────────────────────────────────────────
        // Liste pilotée par « App Settings → Écrans actifs » : ordre et
        // visibilité viennent de AppSettingsProvider. Les écrans smarthome
        // (Groupes/Scènes/Médias/Garages) sont masqués par défaut — ce HEMS
        // est un gestionnaire d'énergie.
        _SectionLabel('VUE PRINCIPALE'),
        for (final screen in settings.visibleScreens)
          if (kScreenRoutes[screen.id] != null)
            _NavItem(
              icon:  screen.icon,
              label: screen.label,
              route: kScreenRoutes[screen.id]!,
            ),

        const SizedBox(height: 4),
        _Divider(),

        // ── CONFIGURATION ─────────────────────────────────────────────────
        _SectionLabel('CONFIGURATION'),
        _NavItem(icon: Icons.auto_fix_high_rounded,  label: 'Magic / Automatisations', route: '/automations', push: true),

        // Gestionnaire d'énergie (ExpansionTile)
        _EnergyManagerExpansion(),

        // App Settings (ExpansionTile)
        _AppSettingsExpansion(),

        const SizedBox(height: 4),
        _Divider(),

        // ── MODE INSTALLATEUR ─────────────────────────────────────────────
        _InstallerSection(isUnlocked: installer.isUnlocked),

        const SizedBox(height: 4),
        _Divider(),

        // ── SUPPORT ───────────────────────────────────────────────────────
        _SectionLabel('SUPPORT'),
        _LinkItem(
          icon: Icons.menu_book_rounded,
          label: 'Documentation',
          url: 'https://docs.etm-powersync.fr/',
        ),
        _LinkItem(
          icon: Icons.telegram_rounded,
          label: 'Telegram',
          url: 'https://t.me/etm_powersync_support',
        ),
        // Discord désactivé — pas de serveur ETM-PowerSync pour l'instant.
        // Réactiver ici dès que l'invite permanente existe :
        // _LinkItem(icon: Icons.discord_rounded, label: 'Discord', url: '...'),
        _NavItem(
          icon: Icons.bug_report_rounded,
          label: 'Rapport de bug',
          route: '/bug-report',
        ),

        const SizedBox(height: 16),
      ],
    );
  }
}

// ── Éléments de menu ──────────────────────────────────────────────────────────

class _SectionLabel extends StatelessWidget {
  final String text;
  const _SectionLabel(this.text);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(20, 14, 20, 8),
      child: Text(text, style: EtmTokens.sectionLabel()),
    );
  }
}

class _Divider extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Divider(
      color: Colors.white.withValues(alpha: 0.08),
      height: 16,
      indent: 20,
      endIndent: 20,
    );
  }
}

/// Item de navigation : ferme le drawer et navigue via GoRouter.
/// Utilise context.go() pour les routes dans le shell (bottom nav),
/// context.push() pour les écrans poussés par-dessus le shell.
class _NavItem extends StatelessWidget {
  final IconData icon;
  final String   label;
  final String   route;
  /// Si true, utilise context.push() (écrans hors shell).
  final bool     push;

  const _NavItem({
    required this.icon,
    required this.label,
    required this.route,
    this.push = false,
  });

  @override
  Widget build(BuildContext context) {
    return _DrawerTile(
      icon: icon,
      label: label,
      onTap: () {
        context.read<NavigationProvider>().closeDrawer();
        if (push) {
          context.push(route);
        } else {
          context.go(route);
        }
      },
    );
  }
}

/// Item qui ouvre une URL dans le navigateur externe.
class _LinkItem extends StatelessWidget {
  final IconData icon;
  final String   label;
  final String   url;

  const _LinkItem({
    required this.icon,
    required this.label,
    required this.url,
  });

  @override
  Widget build(BuildContext context) {
    return _DrawerTile(
      icon: icon,
      label: label,
      trailing: Icon(Icons.open_in_new_rounded,
          size: 14, color: EtmTokens.faintOf(context)),
      onTap: () async {
        context.read<NavigationProvider>().closeDrawer();
        final uri = Uri.parse(url);
        if (!await launchUrl(uri, mode: LaunchMode.externalApplication)) {
          if (context.mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text('Impossible d\'ouvrir : $url')),
            );
          }
        }
      },
    );
  }
}

class _DrawerTile extends StatelessWidget {
  final IconData   icon;
  final String     label;
  final Widget?    trailing;
  final VoidCallback onTap;

  const _DrawerTile({
    required this.icon,
    required this.label,
    required this.onTap,
    this.trailing,
  });

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(10),
      child: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
        child: Row(
          children: [
            Icon(icon, size: 20, color: Colors.white.withValues(alpha: 0.92)),
            const SizedBox(width: 16),
            Expanded(
              child: Text(
                label,
                style: EtmTokens.sans(size: 14, color: Colors.white.withValues(alpha: 0.92)),
              ),
            ),
            if (trailing != null) trailing!,
          ],
        ),
      ),
    );
  }
}

// ── ExpansionTile : Gestionnaire d'énergie ────────────────────────────────────
class _EnergyManagerExpansion extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return _StyledExpansion(
      icon: Icons.energy_savings_leaf_rounded,
      label: 'Gestionnaire d\'énergie',
      children: [
        // 'Rôles & appareils' a migré dans la section MODE INSTALLATEUR :
        // c'est de la configuration d'installation, pas un réglage utilisateur.
        _SubItem('Scheduler & stratégie',  '/energy/scheduler'),
        _SubItem('Tarifs & providers',     '/energy/tariffs'),
        _SubItem('Timeline & décisions',   '/energy/timeline'),
      ],
    );
  }
}

// ── ExpansionTile : App Settings ──────────────────────────────────────────────
class _AppSettingsExpansion extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return _StyledExpansion(
      icon: Icons.settings_rounded,
      label: 'App Settings',
      children: [
        _SubItem('Apparence',              '/settings/app/appearance'),
        _SubItem('Écrans actifs',          '/settings/app/screens'),
        // 'Options développeur' a migré dans la section MODE INSTALLATEUR.
        _SubItem('À propos PowerSync',     '/settings/app/about'),
      ],
    );
  }
}

class _StyledExpansion extends StatelessWidget {
  final IconData      icon;
  final String        label;
  final List<Widget>  children;

  const _StyledExpansion({
    required this.icon,
    required this.label,
    required this.children,
  });

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: Theme.of(context).copyWith(
        dividerColor: Colors.transparent,
      ),
      child: ExpansionTile(
        leading: Icon(icon, size: 20, color: Colors.white.withValues(alpha: 0.92)),
        title: Text(label, style: EtmTokens.sans(size: 14, color: Colors.white.withValues(alpha: 0.92))),
        iconColor: EtmTokens.faintOf(context),
        collapsedIconColor: EtmTokens.faintOf(context),
        tilePadding: const EdgeInsets.symmetric(horizontal: 20),
        childrenPadding: EdgeInsets.zero,
        children: children,
      ),
    );
  }
}

class _SubItem extends StatelessWidget {
  final String label;
  final String route;
  const _SubItem(this.label, this.route);

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () {
        context.read<NavigationProvider>().closeDrawer();
        context.push(route);
      },
      child: Padding(
        padding: const EdgeInsets.fromLTRB(56, 10, 16, 10),
        child: Text(label, style: EtmTokens.sans(size: 13, color: EtmTokens.faintOf(context))),
      ),
    );
  }
}

// ── Section Mode Installateur ─────────────────────────────────────────────────
class _InstallerSection extends StatelessWidget {
  final bool isUnlocked;
  const _InstallerSection({required this.isUnlocked});

  @override
  Widget build(BuildContext context) {
    if (!isUnlocked) {
      // Bouton de déverrouillage
      return Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
        child: InkWell(
          onTap: () => _promptPin(context),
          child: Container(
            margin: const EdgeInsets.fromLTRB(16, 4, 16, 4),
            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
            decoration: BoxDecoration(
              color: EtmTokens.orange.withValues(alpha: 0.12),
              borderRadius: BorderRadius.circular(12),
              border: Border.all(color: EtmTokens.orange.withValues(alpha: 0.4)),
            ),
            child: Row(
              children: [
                Icon(Icons.build_outlined, size: 18, color: EtmTokens.orange),
                const SizedBox(width: 10),
                Expanded(
                  child: Text('Mode installateur',
                      style: EtmTokens.sans(size: 14, weight: FontWeight.w600, color: EtmTokens.orange)),
                ),
                Icon(Icons.lock_outline, size: 16, color: EtmTokens.orange),
              ],
            ),
          ),
        ),
      );
    }

    // Section déverrouillée — menu installateur complet
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _SectionLabel('MODE INSTALLATEUR'),
        _NavItem(
          icon: Icons.account_tree_rounded,
          label: 'Rôles & appareils',
          route: '/energy/setup',
          push: true,
        ),
        _NavItem(
          icon: Icons.tune_rounded,
          label: 'Configuration Things',
          route: '/settings/system/things',
          push: true,
        ),
        _NavItem(
          icon: Icons.router_rounded,
          label: 'Système & réseau',
          route: '/settings/system/network',
          push: true,
        ),
        _NavItem(
          icon: Icons.cable_rounded,
          label: 'Protocoles',
          route: '/settings/system/protocols',
          push: true,
        ),
        _NavItem(
          icon: Icons.cloud_rounded,
          label: 'MQTT / Web server',
          route: '/settings/system/mqtt',
          push: true,
        ),
        _NavItem(
          icon: Icons.extension_rounded,
          label: 'Plugins',
          route: '/settings/system/plugins',
          push: true,
        ),
        _NavItem(
          icon: Icons.system_update_rounded,
          label: 'Mise à jour système',
          route: '/settings/system/update',
          push: true,
        ),
        _NavItem(
          icon: Icons.code_rounded,
          label: 'Outils développeur',
          route: '/settings/system/devtools',
          push: true,
        ),
        _NavItem(
          icon: Icons.developer_mode_rounded,
          label: 'Options développeur',
          route: '/settings/app/developer',
          push: true,
        ),
        _NavItem(
          icon: Icons.info_outline_rounded,
          label: 'À propos ETM',
          route: '/settings/system/about',
          push: true,
        ),
        InkWell(
          onTap: () => context.read<InstallerModeProvider>().lock(),
          child: Container(
            margin: const EdgeInsets.fromLTRB(16, 4, 16, 4),
            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
            decoration: BoxDecoration(
              color: EtmTokens.danger.withValues(alpha: 0.12),
              borderRadius: BorderRadius.circular(12),
              border: Border.all(color: EtmTokens.danger.withValues(alpha: 0.4)),
            ),
            child: Row(
              children: [
                Icon(Icons.lock_outline, size: 18, color: EtmTokens.danger),
                const SizedBox(width: 10),
                Text('Verrouiller mode installateur',
                    style: EtmTokens.sans(size: 14, weight: FontWeight.w600, color: EtmTokens.danger)),
              ],
            ),
          ),
        ),
      ],
    );
  }

  Future<void> _promptPin(BuildContext context) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: false,
      builder: (_) => const InstallerPinDialog(),
    );
    if (result == true && context.mounted) {
      // Le provider a déjà été mis à jour — pas besoin d'action supplémentaire
    }
  }
}