#!/bin/bash
# =============================================================================
# maintenance.sh - Maintenance automatique du photomaton
# =============================================================================
# Usage: bash maintenance.sh
# Appele quotidiennement par photobooth-maintenance.timer
# =============================================================================

set -uo pipefail

LOG_TAG="photomaton-maintenance"
PHOTOBOOTH_DATA="${HOME}/photobooth-data"
PHOTOS_DIR="${PHOTOBOOTH_DATA}/media"
LOG_DIR="${PHOTOBOOTH_DATA}/log"

# Nombre de jours de retention des photos (0 = garder indefiniment)
PHOTO_RETENTION_DAYS=${PHOTO_RETENTION_DAYS:-0}
# Nombre de jours de retention des logs
LOG_RETENTION_DAYS=7
# Taille max du dossier photos en Mo (0 = pas de limite)
MAX_PHOTOS_SIZE_MB=${MAX_PHOTOS_SIZE_MB:-0}

log_info()  { logger -t "$LOG_TAG" "[INFO] $1";  echo "[INFO] $1"; }
log_warn()  { logger -t "$LOG_TAG" "[WARN] $1";  echo "[WARN] $1"; }

echo "=== Maintenance Photomaton - $(date) ==="

# -------------------------------------------------------------------
# 1. NETTOYAGE DES LOGS
# -------------------------------------------------------------------
log_info "Nettoyage des logs..."

# Logs photobooth-app
if [ -d "$LOG_DIR" ]; then
    deleted=$(find "$LOG_DIR" -name "*.log" -mtime +${LOG_RETENTION_DAYS} -delete -print 2>/dev/null | wc -l)
    log_info "  $deleted ancien(s) log(s) photobooth supprime(s)"
fi

# Logs systeme comprimes
find /var/log -name "*.gz" -mtime +3 -delete 2>/dev/null || true
find /var/log -name "*.[0-9]" -mtime +3 -delete 2>/dev/null || true

# Journald - garder seulement 50 Mo
journalctl --vacuum-size=50M 2>/dev/null || true

log_info "Logs nettoyes"

# -------------------------------------------------------------------
# 2. NETTOYAGE DES PHOTOS (si retention configuree)
# -------------------------------------------------------------------
if [ "$PHOTO_RETENTION_DAYS" -gt 0 ] && [ -d "$PHOTOS_DIR" ]; then
    log_info "Nettoyage des photos de plus de ${PHOTO_RETENTION_DAYS} jours..."
    deleted=$(find "$PHOTOS_DIR" -type f \( -name "*.jpg" -o -name "*.png" -o -name "*.gif" \) \
        -mtime +${PHOTO_RETENTION_DAYS} -delete -print 2>/dev/null | wc -l)
    log_info "  $deleted photo(s) supprimee(s)"
fi

# Limite de taille
if [ "$MAX_PHOTOS_SIZE_MB" -gt 0 ] && [ -d "$PHOTOS_DIR" ]; then
    current_size=$(du -sm "$PHOTOS_DIR" 2>/dev/null | awk '{print $1}')
    if [ "${current_size:-0}" -gt "$MAX_PHOTOS_SIZE_MB" ]; then
        log_warn "Dossier photos: ${current_size}Mo > limite ${MAX_PHOTOS_SIZE_MB}Mo"
        log_warn "Suppression des photos les plus anciennes..."
        # Supprimer les plus vieux fichiers jusqu'a etre sous la limite
        while [ "$(du -sm "$PHOTOS_DIR" | awk '{print $1}')" -gt "$MAX_PHOTOS_SIZE_MB" ]; do
            oldest=$(find "$PHOTOS_DIR" -type f \( -name "*.jpg" -o -name "*.png" \) -printf '%T+ %p\n' 2>/dev/null | sort | head -1 | awk '{print $2}')
            if [ -n "$oldest" ]; then
                rm -f "$oldest"
            else
                break
            fi
        done
    fi
fi

# -------------------------------------------------------------------
# 3. NETTOYAGE CUPS
# -------------------------------------------------------------------
log_info "Nettoyage des jobs d'impression..."

# Supprimer les jobs termines/en erreur
cancel -a 2>/dev/null || true

# Reactiver les imprimantes si necessaire
for printer in $(lpstat -p 2>/dev/null | grep "disabled" | awk '{print $2}'); do
    cupsenable "$printer" 2>/dev/null || true
    log_info "  Imprimante reactivee: $printer"
done

log_info "Jobs d'impression nettoyes"

# -------------------------------------------------------------------
# 4. NETTOYAGE CACHE SYSTEME
# -------------------------------------------------------------------
log_info "Nettoyage du cache systeme..."

# Cache apt
apt-get clean 2>/dev/null || true
apt-get autoclean 2>/dev/null || true

# Cache thumbnails
rm -rf ~/.cache/thumbnails/* 2>/dev/null || true

# Fichiers temporaires
find /tmp -type f -mtime +1 -delete 2>/dev/null || true

log_info "Cache systeme nettoye"

# -------------------------------------------------------------------
# 5. VERIFICATION DE L'INTEGRITE
# -------------------------------------------------------------------
log_info "Verification de l'integrite du systeme..."

# Verifier le filesystem (sans corriger, juste signaler)
disk_errors=$(dmesg | grep -c "EXT4-fs error" 2>/dev/null || echo "0")
if [ "$disk_errors" -gt 0 ]; then
    log_warn "  $disk_errors erreur(s) filesystem detectee(s) dans dmesg!"
fi

# Espace disque
disk_usage=$(df / | awk 'NR==2 {print $5}' | tr -d '%')
log_info "  Espace disque utilise: ${disk_usage}%"

# Uptime
uptime_info=$(uptime -p)
log_info "  Uptime: $uptime_info"

# -------------------------------------------------------------------
# 6. RAPPORT
# -------------------------------------------------------------------
echo ""
echo "=== Rapport de maintenance ==="
echo "  Date: $(date)"
echo "  Espace disque: ${disk_usage}%"
if [ -d "$PHOTOS_DIR" ]; then
    photo_count=$(find "$PHOTOS_DIR" -type f \( -name "*.jpg" -o -name "*.png" -o -name "*.gif" \) 2>/dev/null | wc -l)
    photo_size=$(du -sh "$PHOTOS_DIR" 2>/dev/null | awk '{print $1}')
    echo "  Photos: ${photo_count} fichiers (${photo_size})"
fi
echo "  Uptime: $uptime_info"
echo ""

log_info "Maintenance terminee"