#!/usr/bin/env bash
set -euo pipefail

cd "$(dirname "$0")"

# Charger les variables d'environnement
source .env

BACKUP_DIR="./backups"
DATABASES=("sirh_prod" "inventory_prod" "lesstime_prod")
DATE=$(date +%Y-%m-%d_%H%M%S)
LOG_FILE="${BACKUP_DIR}/backup.log"
WEBHOOK_URL="${DISCORD_WEBHOOK_URL:-}"

mkdir -p "$BACKUP_DIR"

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

discord() {
    local color="$1" title="$2" msg="$3"
    [[ -z "$WEBHOOK_URL" ]] && return 0
    curl -fsS -H "Content-Type: application/json" -d "{
        \"embeds\": [{
            \"title\": \"${title}\",
            \"description\": \"${msg}\",
            \"color\": ${color}
        }]
    }" "$WEBHOOK_URL" >/dev/null 2>&1 || true
}

fail() {
    log "ERROR: $1"
    discord 16711680 "Backup PostgreSQL - ECHEC" "$1"
    exit 1
}

# Verifications
command -v docker &>/dev/null || fail "docker n'est pas installe"

# Supprimer les anciens backups (on ne garde que le dernier)
rm -f "${BACKUP_DIR}"/*.sql

log "Debut backup PostgreSQL"

DETAILS=""
ERRORS=0

for DB in "${DATABASES[@]}"; do
    log "Dumping ${DB}..."
    if docker compose exec -T postgres pg_dump -U admin "$DB" > "${BACKUP_DIR}/${DB}-${DATE}.sql" 2>/dev/null; then
        SIZE=$(du -h "${BACKUP_DIR}/${DB}-${DATE}.sql" | cut -f1)
        log "${DB} sauvegarde (${SIZE})"
        DETAILS="${DETAILS}\\n- **${DB}** : ${SIZE}"
    else
        log "ERREUR sur ${DB}"
        DETAILS="${DETAILS}\\n- **${DB}** : ERREUR"
        ((ERRORS++))
    fi
done

if [[ $ERRORS -gt 0 ]]; then
    fail "Backup termine avec ${ERRORS} erreur(s) :${DETAILS}"
fi

log "Backup termine avec succes"
discord 65280 "Backup PostgreSQL - OK" "Backup **${DATE}** termine\\n${DETAILS}"