#!/bin/bash  
# Copyright (C) 2026 Cédric Abonnel
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

set -u  

# Configuration locale
WARNING=80
CRITICAL=95
MOUNTS=("/" "/var" "/home")
LOG_BIN="/opt/monitoring/bin/log-cli.php"

# --- Vérification ROOT ---
if [ "${EUID}" -ne 0 ]; then
    echo "ERREUR : Ce script doit être exécuté en tant que root." >&2
    $LOG_BIN ERROR "internal_error" "Tentative d'exécution sans privilèges root."
    exit 1
fi

for mount in "${MOUNTS[@]}"; do
    if ! mountpoint -q "$mount"; then continue; fi

    used_pct="$(df -P "$mount" 2>/dev/null | awk 'NR==2 {gsub("%","",$5); print $5}')"
    
    if [[ ! "$used_pct" =~ ^[0-9]+$ ]]; then
        $LOG_BIN ERROR "check_failed" "Erreur lecture disque $mount."
        continue
    fi

    # Logique de décision
    if [ "$used_pct" -ge "$CRITICAL" ]; then
        $LOG_BIN CRITICAL "disk_usage_critical" "Disque $mount critique. $used_pct% utilisé."
        
        $LOG_BIN WARNING "disk_usage_high" "Disque $mount élevé. $used_pct% utilisé."
    else
        $LOG_BIN INFO "disk_ok" "Disque $mount OK. $used_pct% utilisé."
    fi
done

# --- 2. Étude des Inodes ---
# df -i récupère l'utilisation des inodes
inode_pct="$(df -iP "$mount" 2>/dev/null | awk 'NR==2 {gsub("%","",$5); print $5}')"

if [[ ! "$inode_pct" =~ ^[0-9]+$ ]]; then
    $LOG_BIN ERROR "check_failed" "Erreur lecture inodes $mount."
    continue
fi

if [ "$inode_pct" -ge "$CRITICAL" ]; then
    $LOG_BIN CRITICAL "inode_usage_critical" "Inodes $mount critiques ($inode_pct% utilisé)."
elif [ "$inode_pct" -ge "$WARNING" ]; then
    $LOG_BIN WARNING "inode_usage_high" "Inodes $mount élevés ($inode_pct% utilisé)."
else
    $LOG_BIN INFO "inode_ok" "Inodes $mount OK ($inode_pct% utilisé)."
fi