#!/bin/bash

# Variables d'environnement
BACKUP_DIR=${BACKUP_DIR:-"/backups"}
DIRECTORIES=${DIRECTORIES:-"/source /source2"}
RETENTION_DAYS=${RETENTION_DAYS:-14}

# Array contenant les dossiers à sauvegarder (split des espaces)
DIRECTORIES_ARRAY=($DIRECTORIES)

# Message de démarrage
echo "INFO: Starting backup script (v2.1) with the following variables"
echo "INFO: - BACKUP_DIR: $BACKUP_DIR"
echo "INFO: - DIRECTORIES: $DIRECTORIES"
echo "INFO: - RETENTION_DAYS: $RETENTION_DAYS"

# Fonction de sortie sur erreur
exit_with_error() {
    echo "ERROR: $1"
    exit 1
}

# Vérification du dossier de backup
if [ ! -d "$BACKUP_DIR" ]; then
    exit_with_error "Backup directory '$BACKUP_DIR' does not exist!"
fi

# Boucle pour chaque dossier dans l'array
for dir in "${DIRECTORIES_ARRAY[@]}"; do
    # Vérification si le dossier existe
    if [ ! -d "$dir" ]; then
        echo "WARNING: Source directory $dir does not exist. Skipping..."
        continue
    fi
    
    # Création du nom de fichier de backup avec la date
    base_name=$(basename "$dir")
    file_name="${BACKUP_DIR}/${base_name}_$(date +%Y-%m-%d_%H-%M-%S).tar.gz"
    
    echo "INFO: Backuping '$dir'..."
    
    # Création du backup zip
    output=$(tar -czf "$file_name" "$dir" 2>&1)
    
    # Affichage du message de succès ou d'erreur
    if [ $? -eq 0 ]; then
        echo "INFO: Backup of '$dir' successful: $file_name"
    else
        echo "ERROR: Failed to backup '$dir'"
        echo "ERROR: $output"
        continue
    fi
done

# Suppression des backups plus vieux que ${RETENTION_DAYS} jours
echo "INFO: Checking for backups older than ${RETENTION_DAYS} days..."
old_files=$(find "$BACKUP_DIR" -type f -name "*.tar.gz" -mtime +${RETENTION_DAYS})
if [ -n "$old_files" ]; then
    echo "INFO: Deleting the following files: $old_files"
    
    # Suppression réelle
    echo "$old_files" | xargs rm -f
else
    echo "INFO: No old backups to delete."
fi