#!/usr/bin/env bash
# ==============================================================================
# NexusPBX - Script d'Installation & Configuration Tout-en-Un (Debian / Ubuntu)
# ==============================================================================
# Utilisation rapide sur une machine vierge :
#   bash <(curl -sSL https://git.sorcier-research.com/sorcier/NexusPBX/raw/branch/main/install.sh)
# Ou après clonage :
#   cd /var/www/nexus-pbx && bash install.sh
# ==============================================================================

set -euo pipefail

# Couleurs pour l'affichage de l'installation
C_GREEN="\033[1;32m"
C_CYAN="\033[1;36m"
C_YELLOW="\033[1;33m"
C_RED="\033[1;31m"
C_RESET="\033[0m"

echo -e "${C_CYAN}"
cat << "BANNER"
  _   _                       ____  ______  __  __ 
 | \ | | _____  ___   _ ___  |  _ \| __ ) \ \/ / 
 |  \| |/ _ \ \/ / | | / __| | |_) |  _ \  \  /  
 | |\  |  __/>  <| |_| \__ \ |  __/| |_) | /  \  
 |_| \_|\___/_/\_\\__,_|___/ |_|   |____/ /_/\_\ 

       Installation & Déploiement Automatisé
BANNER
echo -e "${C_RESET}"

# 1. Vérification des droits root
if [ "$(id -u)" -ne 0 ]; then
    echo -e "${C_RED}[ERREUR] Ce script d'installation doit être exécuté en tant que root (sudo).${C_RESET}"
    exit 1
fi

export DEBIAN_FRONTEND=noninteractive

# Pré-configuration debconf pour iptables-persistent (évite tout blocage interactif)
echo "iptables-persistent iptables-persistent/autosave_v4 boolean true" | debconf-set-selections 2>/dev/null || true
echo "iptables-persistent iptables-persistent/autosave_v6 boolean true" | debconf-set-selections 2>/dev/null || true

# 2. Mise à jour des dépôts APT et installation des dépendances système
echo -e "${C_GREEN}[1/8] Mise à jour des paquets et installation des dépendances...${C_RESET}"
apt-get update -y

# Outils système essentiels
apt-get install -y --no-install-recommends \
    curl \
    wget \
    git \
    sudo \
    sqlite3 \
    cron \
    net-tools \
    openssl \
    ca-certificates \
    iptables \
    iptables-persistent \
    acl \
    ffmpeg \
    rsync \
    sox \
    sshpass

# Vérification et installation d'Asterisk
echo -e "${C_GREEN}  -> Installation du moteur Asterisk PBX...${C_RESET}"
if ! apt-cache policy asterisk 2>/dev/null | grep -q "Candidate: [0-9]"; then
    echo -e "${C_YELLOW}  -> Configuration du canal Debian pour le paquet Asterisk...${C_RESET}"
    echo "deb http://deb.debian.org/debian sid main" > /etc/apt/sources.list.d/debian-asterisk.list
    cat << 'EOF' > /etc/apt/preferences.d/asterisk
Package: asterisk* libasterisk*
Pin: release a=sid
Pin-Priority: 990

Package: *
Pin: release a=sid
Pin-Priority: 100
EOF
    apt-get update -y
fi

if ! apt-get install -y asterisk; then
    echo -e "${C_YELLOW}  -> Installation directe via le canal Sid (-t sid)...${C_RESET}"
    echo "deb http://deb.debian.org/debian sid main" > /etc/apt/sources.list.d/debian-asterisk.list
    apt-get update -y
    apt-get install -y -t sid asterisk
fi

# Sons Asterisk en français (exacts de la machine de dev)
apt-get install -y asterisk-core-sounds-fr asterisk-core-sounds-fr-wav asterisk-core-sounds-fr-gsm 2>/dev/null || true

# Nginx, PHP-FPM et extensions requises
apt-get install -y --no-install-recommends \
    nginx \
    php-fpm \
    php-sqlite3 \
    php-curl \
    php-xml \
    php-mbstring \
    php-zip \
    php-cli

# Sécurité (Fail2ban & Certbot)
apt-get install -y --no-install-recommends \
    fail2ban \
    certbot \
    python3-certbot-nginx

# Création défensive et garantie des groupes et utilisateurs système
if ! getent group asterisk >/dev/null 2>&1; then
    groupadd -r asterisk
fi
if ! getent passwd asterisk >/dev/null 2>&1; then
    useradd -r -g asterisk -d /var/lib/asterisk -s /usr/sbin/nologin asterisk
fi
if ! getent group www-data >/dev/null 2>&1; then
    groupadd -r www-data
fi
if ! getent passwd www-data >/dev/null 2>&1; then
    useradd -r -g www-data -d /var/www -s /usr/sbin/nologin www-data
fi

# 3. Déploiement / Clonage du code source NexusPBX
echo -e "${C_GREEN}[2/8] Préparation et déploiement des fichiers NexusPBX...${C_RESET}"
TARGET_DIR="/var/www/nexus-pbx"

if [ -d "$TARGET_DIR/.git" ]; then
    echo "  -> Dépôt NexusPBX déjà présent dans $TARGET_DIR, mise à jour..."
    cd "$TARGET_DIR"
    git config --global --add safe.directory "$TARGET_DIR" 2>/dev/null || true
    git pull origin main 2>/dev/null || true
elif [ -d "$PWD/public" ] && [ -d "$PWD/src" ]; then
    echo "  -> Exécution depuis le dossier source, synchronisation vers $TARGET_DIR..."
    if [ "$PWD" != "$TARGET_DIR" ]; then
        mkdir -p "$TARGET_DIR"
        cp -a . "$TARGET_DIR/"
        cd "$TARGET_DIR"
    fi
else
    echo "  -> Clonage du dépôt public officiel depuis https://git.sorcier-research.com..."
    rm -rf "$TARGET_DIR"
    git clone https://git.sorcier-research.com/sorcier/NexusPBX.git "$TARGET_DIR"
    cd "$TARGET_DIR"
fi

# 4. Configuration des utilisateurs, groupes et arborescence de stockage
echo -e "${C_GREEN}[3/8] Configuration des permissions et de l'arborescence...${C_RESET}"
usermod -aG asterisk www-data 2>/dev/null || true
usermod -aG www-data asterisk 2>/dev/null || true

# Création de l'ensemble des répertoires requis
mkdir -p "$TARGET_DIR/storage/backups"
mkdir -p "$TARGET_DIR/storage/system_backups"
mkdir -p "$TARGET_DIR/storage/sounds"
mkdir -p "$TARGET_DIR/public/avatars"
mkdir -p /etc/asterisk/keys
mkdir -p /var/lib/asterisk/sounds/custom
mkdir -p /var/spool/asterisk/voicemail/default
mkdir -p /var/log/asterisk
mkdir -p /var/log/nexus-pbx

touch /var/log/asterisk/messages /var/log/asterisk/security.log
chown asterisk:asterisk /var/log/asterisk/messages /var/log/asterisk/security.log 2>/dev/null || true
chmod 0664 /var/log/asterisk/messages /var/log/asterisk/security.log 2>/dev/null || true

touch /var/log/nexus_security.log
chown www-data:asterisk /var/log/nexus_security.log 2>/dev/null || true
chmod 0664 /var/log/nexus_security.log 2>/dev/null || true

# Droits applicatifs stricts
chown -R www-data:asterisk "$TARGET_DIR"
chmod 2775 "$TARGET_DIR/storage" \
           "$TARGET_DIR/storage/backups" \
           "$TARGET_DIR/storage/system_backups" \
           "$TARGET_DIR/storage/sounds" \
           "$TARGET_DIR/public/avatars"

mkdir -p /var/lib/asterisk/sounds/custom /var/lib/asterisk/moh /var/spool/asterisk/voicemail
chown -R asterisk:asterisk /etc/asterisk /var/lib/asterisk /var/spool/asterisk /var/log/asterisk
chmod -R 775 /etc/asterisk /var/lib/asterisk/sounds /var/lib/asterisk/moh /var/spool/asterisk
chmod 2775 /etc/asterisk /var/lib/asterisk/sounds /var/lib/asterisk/sounds/custom /var/lib/asterisk/moh /var/spool/asterisk
chmod 2750 /etc/asterisk/keys
setfacl -R -m u:www-data:rwx,g:asterisk:rwx /etc/asterisk /var/lib/asterisk/sounds /var/lib/asterisk/moh /var/spool/asterisk 2>/dev/null || true
setfacl -R -d -m u:www-data:rwx,g:asterisk:rwx /etc/asterisk /var/lib/asterisk/sounds /var/lib/asterisk/moh /var/spool/asterisk 2>/dev/null || true

# Droits sudoers pour l'interface web (www-data)
cat << 'EOF' > /etc/sudoers.d/nexus-pbx
# Privilèges spécifiques NexusPBX pour l'utilisateur Web www-data
www-data ALL=(ALL) NOPASSWD: /usr/sbin/asterisk, /usr/sbin/nginx, /usr/bin/systemctl, /usr/bin/fail2ban-client, /bin/fail2ban-client, /var/www/nexus-pbx/scripts/nexus-firewall, /usr/bin/certbot, /usr/sbin/nft, /usr/sbin/iptables, /var/www/nexus-pbx/scripts/update.sh, /usr/local/bin/nexus-update
EOF
chmod 0440 /etc/sudoers.d/nexus-pbx

# Autorisation d'écriture systemd pour PHP-FPM (Debian 12/13 ProtectSystem=full)
for fpm_svc in /lib/systemd/system/php*-fpm.service /usr/lib/systemd/system/php*-fpm.service; do
    if [ -f "$fpm_svc" ]; then
        svc_name=$(basename "$fpm_svc")
        mkdir -p "/etc/systemd/system/${svc_name}.d"
        cat << 'EOF_OVERRIDE' > "/etc/systemd/system/${svc_name}.d/override.conf"
[Service]
ReadWritePaths=/etc/asterisk /etc/fail2ban /etc/nginx /var/log /var/lib/asterisk /var/spool/asterisk
EOF_OVERRIDE
    fi
done
systemctl daemon-reload

# Configuration des limites d'upload PHP (Restauration d'archives 512 Mo & Sons volumineux)
for php_dir in /etc/php/*; do
    if [ -d "$php_dir/fpm/conf.d" ]; then
        cat << 'EOF_PHP' > "$php_dir/fpm/conf.d/99-nexus.ini"
upload_max_filesize = 512M
post_max_size = 512M
memory_limit = 512M
max_execution_time = 300
max_input_time = 300
EOF_PHP
    fi
    if [ -d "$php_dir/cli/conf.d" ]; then
        cat << 'EOF_PHP' > "$php_dir/cli/conf.d/99-nexus.ini"
upload_max_filesize = 512M
post_max_size = 512M
memory_limit = 512M
max_execution_time = 300
max_input_time = 300
EOF_PHP
    fi
done

# 5. Configuration d'Asterisk & Certificats TLS de secours
echo -e "${C_GREEN}[4/8] Configuration du moteur Asterisk PJSIP & AMI...${C_RESET}"

# AMI Manager (/etc/asterisk/manager.conf)
cat << 'EOF' > /etc/asterisk/manager.conf
[general]
enabled = yes
port = 5038
bindaddr = 127.0.0.1
displayconnects = no
timestampevents = yes

[pbxgui]
secret = AsteriskAmi2026!
deny = 0.0.0.0/0.0.0.0
permit = 127.0.0.1/255.255.255.0
permit = 127.0.0.1/32
permit = ::1/128
read = all
write = all
EOF
chown asterisk:asterisk /etc/asterisk/manager.conf
chmod 0640 /etc/asterisk/manager.conf

# Fichier de logs pour Fail2ban
cat << 'EOF' > /etc/asterisk/logger.conf
[general]
dateformat=%F %T

[logfiles]
console => notice,warning,error
messages => notice,warning,error,security
security.log => security
EOF
chown asterisk:asterisk /etc/asterisk/logger.conf 2>/dev/null || true
chmod 0664 /etc/asterisk/logger.conf 2>/dev/null || true

# Certificat TLS auto-signé initial pour PJSIP TLS (port 5061) et Nginx HTTPS (port 8443)
if [ ! -f /etc/asterisk/keys/asterisk.crt ] || [ ! -f /etc/asterisk/keys/asterisk.key ]; then
    openssl req -x509 -nodes -days 3650 -newkey rsa:2048 \
        -keyout /etc/asterisk/keys/asterisk.key \
        -out /etc/asterisk/keys/asterisk.crt \
        -subj "/C=FR/ST=IDF/L=Paris/O=NexusPBX/CN=pbx.local" 2>/dev/null
fi

if [ ! -f /etc/asterisk/keys/active_cert.crt ]; then
    cp -f /etc/asterisk/keys/asterisk.crt /etc/asterisk/keys/active_cert.crt
    cp -f /etc/asterisk/keys/asterisk.key /etc/asterisk/keys/active_key.key
fi

chown asterisk:asterisk /etc/asterisk/keys/* 2>/dev/null || true
chmod 0640 /etc/asterisk/keys/* 2>/dev/null || true

# Inclusions custom dans Asterisk & initialisation des fichiers cibles
touch /etc/asterisk/pjsip.conf \
      /etc/asterisk/pjsip.custom.conf \
      /etc/asterisk/extensions.conf \
      /etc/asterisk/extensions.custom.conf \
      /etc/asterisk/musiconhold.custom.conf \
      /etc/asterisk/voicemail.custom.conf \
      /etc/asterisk/rtp.conf \
      /etc/asterisk/features.conf

if ! grep -q 'pjsip.custom.conf' /etc/asterisk/pjsip.conf 2>/dev/null; then
    printf '\n#tryinclude "pjsip.custom.conf"\n' >> /etc/asterisk/pjsip.conf
fi
if ! grep -q 'extensions.custom.conf' /etc/asterisk/extensions.conf 2>/dev/null; then
    printf '\n#tryinclude "extensions.custom.conf"\n' >> /etc/asterisk/extensions.conf
fi
chown -R asterisk:asterisk /etc/asterisk
chmod 0664 /etc/asterisk/*.conf /etc/asterisk/*.custom.conf 2>/dev/null || true
chmod 2750 /etc/asterisk/keys
chmod 2775 /etc/asterisk
setfacl -R -m u:www-data:rwx,g:asterisk:rwx /etc/asterisk 2>/dev/null || true
setfacl -R -d -m u:www-data:rwx,g:asterisk:rwx /etc/asterisk 2>/dev/null || true

# Rechargement Asterisk immédiat pour appliquer AMI et Logger
asterisk -rx "core reload" 2>/dev/null || true
asterisk -rx "manager reload" 2>/dev/null || true

# 6. Initialisation de la Base de données SQLite & Configuration initiale
echo -e "${C_GREEN}[5/8] Initialisation de la base SQLite et configuration NexusPBX...${C_RESET}"

php -r '
require_once "/var/www/nexus-pbx/src/Database.php";
require_once "/var/www/nexus-pbx/src/ConfigGenerator.php";
require_once "/var/www/nexus-pbx/src/PhonebookManager.php";
require_once "/var/www/nexus-pbx/src/FirewallManager.php";

$db = App\Database::getConnection();

// Détection de l interface et du sous-réseau local primaire
$localNet = "192.168.1.0/24";
$ipOut = shell_exec("ip -o -4 route show to default 2>/dev/null | awk \"{print \\\$5}\"");
$dev = trim((string)$ipOut);
if ($dev !== "") {
    $cidrOut = shell_exec("ip -o -4 addr show dev " . escapeshellarg($dev) . " | awk \"{print \\\$4}\" | head -n 1");
    $cidr = trim((string)$cidrOut);
    if ($cidr !== "") {
        $parts = explode("/", $cidr);
        $ip = $parts[0] ?? "";
        $mask = (int)($parts[1] ?? 24);
        if ($mask >= 16 && $mask <= 24) {
            $longIp = ip2long($ip);
            $longMask = ~((1 << (32 - $mask)) - 1);
            $netIp = long2ip($longIp & $longMask);
            $localNet = "{$netIp}/{$mask}";
        }
    }
}

// Mise à jour sécurisée des paramètres initiaux
$st = $db->query("SELECT * FROM settings WHERE id = 1")->fetch(PDO::FETCH_ASSOC);
if ($st) {
    $db->prepare("UPDATE settings SET local_net = :net, local_networks_json = :nets WHERE id = 1")->execute([
        ":net"  => $localNet,
        ":nets" => json_encode([$localNet, "127.0.0.1/32"]),
    ]);
}

// Génération initiale de pjsip.conf et extensions.conf
$generator = new App\ConfigGenerator($db);
$generator->writeAllConfigs();

// Initialisation de l annuaire et synchronisation
App\PhonebookManager::initDirectory();
App\PhonebookManager::syncExtensions($db);
'

chown -R www-data:asterisk "$TARGET_DIR/storage"
chmod 0660 "$TARGET_DIR"/storage/*.sqlite* 2>/dev/null || true

# 7. Configuration de Nginx et Fail2ban
echo -e "${C_GREEN}[6/8] Configuration du serveur Web Nginx et de Fail2ban...${C_RESET}"

# Détection de la socket PHP-FPM
PHP_SOCK=$(find /run/php/ -name "php*-fpm.sock" 2>/dev/null | head -n 1)
if [ -z "$PHP_SOCK" ]; then
    PHP_SOCK="/run/php/php8.4-fpm.sock"
fi

# Préparation des répertoires Nginx et activation de nexus-pbx
mkdir -p /etc/nginx/sites-available /etc/nginx/sites-enabled
rm -f /etc/nginx/sites-enabled/default
ln -sf /etc/nginx/sites-available/nexus-pbx /etc/nginx/sites-enabled/nexus-pbx

# Application de la configuration Nginx complète (Ports 80, 8080, 8443)
php -r '
require_once "/var/www/nexus-pbx/src/Database.php";
require_once "/var/www/nexus-pbx/src/FirewallManager.php";
$db = App\Database::getConnection();
$st = $db->query("SELECT admin_https_port, certbot_strict_port80 FROM settings WHERE id = 1")->fetch(PDO::FETCH_ASSOC);
App\FirewallManager::applyNginxConfig((int)($st["admin_https_port"] ?? 8443), (int)($st["certbot_strict_port80"] ?? 0));
'

# Filtre Fail2ban pour l'interface Nexus-Web
cat << 'EOF' > /etc/fail2ban/filter.d/nexus-web.conf
[Definition]
failregex = ^.*\[NEXUS-WEB-AUTH-FAIL\]:\s*<HOST>.*$
ignoreregex =
EOF
chmod 0644 /etc/fail2ban/filter.d/nexus-web.conf

# Génération automatique et centralisée de /etc/fail2ban/jail.local (Source unique FirewallManager)
php -r '
require_once "/var/www/nexus-pbx/src/Database.php";
require_once "/var/www/nexus-pbx/src/FirewallManager.php";
$st = App\FirewallManager::getSettings();
App\FirewallManager::generateJailLocal(
    $st["fail2ban_whitelist_ips"],
    (int)$st["fail2ban_sip_maxretry"],
    (int)$st["fail2ban_sip_findtime"],
    (int)$st["fail2ban_sip_bantime"],
    (int)$st["fail2ban_web_maxretry"],
    (int)$st["fail2ban_web_bantime"],
    (int)$st["admin_https_port"]
);
'

chown root:asterisk /etc/fail2ban/jail.local
chmod 0664 /etc/fail2ban/jail.local
setfacl -m u:www-data:rw /etc/fail2ban/jail.local 2>/dev/null || true

chown root:asterisk /etc/nginx/sites-available/nexus-pbx
chmod 0664 /etc/nginx/sites-available/nexus-pbx
setfacl -m u:www-data:rw /etc/nginx/sites-available/nexus-pbx 2>/dev/null || true

# 8. Crontab & Bannière d'accueil Console (Style FreePBX)
echo -e "${C_GREEN}[7/8] Mise en place des tâches programmées et de la bannière console...${C_RESET}"

# Cron sauvegarde automatique toutes les 10 minutes
cat << 'EOF' > /etc/cron.d/nexus-backup
# Sauvegardes programmées automatiques NexusPBX
*/10 * * * * www-data /usr/bin/php /var/www/nexus-pbx/scripts/nexus_autobackup.php >> /var/log/nexus_backup.log 2>&1
EOF
chmod 0644 /etc/cron.d/nexus-backup
touch /var/log/nexus_backup.log && chown www-data:asterisk /var/log/nexus_backup.log && chmod 664 /var/log/nexus_backup.log

# CLI symlinks
chmod +x "$TARGET_DIR/scripts/nexus-firewall" "$TARGET_DIR/scripts/nexus-banner.sh" "$TARGET_DIR/scripts/update.sh"
ln -sf "$TARGET_DIR/scripts/nexus-firewall" /usr/local/bin/nexus-firewall
ln -sf "$TARGET_DIR/scripts/nexus-banner.sh" /usr/local/bin/nexus-banner
ln -sf "$TARGET_DIR/scripts/update.sh" /usr/local/bin/nexus-update

# Bannière interactive lors de chaque connexion terminal (SSH / Console)
cat << 'EOF' > /etc/profile.d/nexus-motd.sh
#!/bin/sh
if [ -x /usr/local/bin/nexus-banner ]; then
    /usr/local/bin/nexus-banner
fi
EOF
chmod +x /etc/profile.d/nexus-motd.sh

# 9. Activation et redémarrage de tous les services
echo -e "${C_GREEN}[8/8] Démarrage et activation des services système...${C_RESET}"
systemctl daemon-reload

# Redémarrage PHP-FPM (rechargement de l'appartenance au groupe asterisk)
systemctl restart php*-fpm 2>/dev/null || true
PHP_SVC=$(systemctl list-unit-files --type=service 2>/dev/null | grep -E "php.*-fpm" | awk '{print $1}' | head -n 1 || echo "php8.4-fpm")
systemctl restart "$PHP_SVC" 2>/dev/null || true
systemctl enable "$PHP_SVC" 2>/dev/null || true

# Redémarrage Asterisk, Nginx, Fail2ban, Cron
systemctl restart asterisk && systemctl enable asterisk
systemctl restart fail2ban && systemctl enable fail2ban
nginx -t && systemctl restart nginx && systemctl enable nginx
systemctl restart cron && systemctl enable cron

# Exécution immédiate de la bannière console
clear || true
/usr/local/bin/nexus-banner --force || true