#!/bin/bash
# Script: monitor-ssl-certificates.sh
# Locatie: /opt/scripts/monitor-ssl-certificates.sh (pe pvemini)
# Scop: Verifica certificatele SSL extern si alerteaza/forteaza reinstalare
# Rulare: Cron zilnic sau la cerere

set -e

# Configurare
DAYS_WARNING=14
DAYS_CRITICAL=7
LOG_FILE="/var/log/ssl-monitor.log"
EMAIL_TO="root"  # Proxmox trimite la adresa configurata

# Domenii de verificat
DOMAINS=(
    "roa.romfast.ro"
    "dokploy.romfast.ro"
    "gitea.romfast.ro"
    "roa2web.romfast.ro"
)

# Site IDs pentru fiecare domeniu (in aceeasi ordine)
SITE_IDS=(1 2 3 4)

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOG_FILE"
}

check_certificate() {
    local domain=$1
    local expiry_date expiry_epoch now_epoch days_left

    # Obtine data expirare
    expiry_date=$(echo | openssl s_client -servername "$domain" -connect "$domain:443" 2>/dev/null | \
                  openssl x509 -noout -enddate 2>/dev/null | cut -d= -f2)

    if [[ -z "$expiry_date" ]]; then
        echo "-1"
        return
    fi

    # Calculeaza zilele ramase
    expiry_epoch=$(date -d "$expiry_date" +%s 2>/dev/null)
    now_epoch=$(date +%s)
    days_left=$(( (expiry_epoch - now_epoch) / 86400 ))

    echo "$days_left"
}

force_renew_certificate() {
    local site_id=$1
    local domain=$2

    log "Fortez reinstalare certificat pentru $domain (Site ID: $site_id)..."

    # Executa pe VM 201 prin Proxmox guest agent
    result=$(qm guest exec 201 -- powershell -Command \
        "cd C:\\Tools\\win-acme; .\\wacs.exe --target iis --siteid $site_id --installation iis --force" 2>&1)

    if echo "$result" | grep -q '"exitcode" : 0'; then
        log "SUCCES: Certificat reinstalat pentru $domain"
        return 0
    else
        log "EROARE: Reinstalare esuata pentru $domain"
        log "$result"
        return 1
    fi
}

restart_iis() {
    log "Restart IIS..."
    qm guest exec 201 -- cmd /c "iisreset" >/dev/null 2>&1
    log "IIS restartat"
}

send_alert() {
    local subject=$1
    local body=$2

    # Foloseste sistemul de notificari Proxmox
    if command -v pvesh &>/dev/null; then
        echo "$body" | mail -s "$subject" "$EMAIL_TO" 2>/dev/null || true
    fi

    log "ALERT: $subject"
}

# Main
log "========== Verificare certificate SSL =========="

warnings=()
criticals=()
renewed=0

for i in "${!DOMAINS[@]}"; do
    domain="${DOMAINS[$i]}"
    site_id="${SITE_IDS[$i]}"

    days_left=$(check_certificate "$domain")

    if [[ "$days_left" == "-1" ]]; then
        log "EROARE: Nu pot verifica $domain"
        criticals+=("$domain: Nu pot obtine certificatul")
        continue
    fi

    log "$domain: $days_left zile ramase"

    if [[ $days_left -lt 0 ]]; then
        criticals+=("$domain: EXPIRAT!")
        # Forteaza reinstalare
        if force_renew_certificate "$site_id" "$domain"; then
            ((renewed++))
        fi
    elif [[ $days_left -lt $DAYS_CRITICAL ]]; then
        criticals+=("$domain: expira in $days_left zile")
        # Forteaza reinstalare
        if force_renew_certificate "$site_id" "$domain"; then
            ((renewed++))
        fi
    elif [[ $days_left -lt $DAYS_WARNING ]]; then
        warnings+=("$domain: expira in $days_left zile")
        # Forteaza reinstalare preventiv
        if force_renew_certificate "$site_id" "$domain"; then
            ((renewed++))
        fi
    fi
done

# Restart IIS daca am reinoit
if [[ $renewed -gt 0 ]]; then
    restart_iis
fi

# Trimite alerte
if [[ ${#criticals[@]} -gt 0 ]]; then
    body="Certificate SSL CRITICE:\n\n"
    for msg in "${criticals[@]}"; do
        body+="- $msg\n"
    done
    body+="\nActiuni intreprinse: $renewed certificate reinstalate"
    send_alert "[CRITICAL] Certificate SSL expirate/aproape de expirare" "$body"
fi

if [[ ${#warnings[@]} -gt 0 && ${#criticals[@]} -eq 0 ]]; then
    body="Certificate SSL WARNING:\n\n"
    for msg in "${warnings[@]}"; do
        body+="- $msg\n"
    done
    body+="\nActiuni intreprinse: $renewed certificate reinstalate"
    send_alert "[WARNING] Certificate SSL aproape de expirare" "$body"
fi

log "========== Sumar: $renewed reinstalate, ${#warnings[@]} warnings, ${#criticals[@]} critice =========="

exit 0