#!/bin/bash
# nas-update-system — Vérifie les mises à jour système disponibles (apt)
# Usage : nas-update-system
# Output : JSON (mode non-interactif) ou texte coloré (mode terminal)

set -euo pipefail

if [ -t 1 ]; then INTERACTIVE=true; else INTERACTIVE=false; fi

# Couleurs (mode terminal uniquement)
if $INTERACTIVE; then
    RED='\033[0;31m'
    GREEN='\033[0;32m'
    YELLOW='\033[1;33m'
    CYAN='\033[0;36m'
    BOLD='\033[1m'
    RESET='\033[0m'
else
    RED='' GREEN='' YELLOW='' CYAN='' BOLD='' RESET=''
fi

if $INTERACTIVE; then
    echo -e "${BOLD}--- Mise à jour de la liste des paquets ---${RESET}"
fi

apt-get update -qq 2>/dev/null

# Parser apt list --upgradable
# Format : nom/suite version arch [upgradable from: ancienne_version]
packages_json=""
count=0

while IFS= read -r line; do
    # Ignorer la ligne d'avertissement "Listing..."
    [[ "$line" =~ ^Listing ]] && continue
    [[ -z "$line" ]] && continue

    # Extraire le nom (avant le /)
    name=$(echo "$line" | cut -d'/' -f1)
    # Extraire la version disponible (2ème champ)
    available=$(echo "$line" | awk '{print $2}')
    # Extraire la version actuelle (après "upgradable from:")
    current=$(echo "$line" | grep -oP 'upgradable from: \K[^\]]+' || echo "inconnue")

    if $INTERACTIVE; then
        echo -e "  ${CYAN}${name}${RESET} : ${YELLOW}${current}${RESET} → ${GREEN}${available}${RESET}"
    fi

    # Construire JSON
    entry="{\"name\":\"${name}\",\"current\":\"${current}\",\"available\":\"${available}\"}"
    if [ $count -eq 0 ]; then
        packages_json="${entry}"
    else
        packages_json="${packages_json},${entry}"
    fi
    count=$((count + 1))

done < <(apt list --upgradable 2>/dev/null)

# Vérifier si reboot requis
reboot_required=false
if [ -f /var/run/reboot-required ]; then
    reboot_required=true
fi

if $INTERACTIVE; then
    echo ""
    echo -e "${BOLD}--- Bilan ---${RESET}"
    if [ $count -eq 0 ]; then
        echo -e "${GREEN}✅ Système à jour.${RESET}"
    else
        echo -e "${YELLOW}📦 ${count} paquet(s) à mettre à jour.${RESET}"
    fi
    if $reboot_required; then
        echo -e "${RED}⚠️  Redémarrage requis.${RESET}"
    fi
else
    printf '{"count":%d,"reboot_required":%s,"packages":[%s]}\n' \
        "$count" "$reboot_required" "$packages_json"
fi