#!/bin/bash
# ============================================================
# backup-n8n.sh — Backup do SQLite do n8n
# Executado 2x/dia (meio-dia e meia-noite) via cron
# ============================================================
set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BACKUP_DIR="$SCRIPT_DIR/../../backup/n8n"
LOG_FILE="$SCRIPT_DIR/../logs/backup-n8n.log"

mkdir -p "$BACKUP_DIR"
mkdir -p "$(dirname "$LOG_FILE")"

echo "==========================================" >> "$LOG_FILE"
echo "Backup n8n iniciado: $(date '+%Y-%m-%d %H:%M:%S')" >> "$LOG_FILE"
echo "==========================================" >> "$LOG_FILE"

# Caminho do SQLite no volume Docker
N8N_DB="/var/lib/docker/volumes/m5_n8n_data/_data/database.sqlite"

# Sanidade: arquivo existe?
if [ ! -f "$N8N_DB" ]; then
    echo "ERRO: $N8N_DB nao encontrado" >> "$LOG_FILE"
    exit 1
fi

# Backup rotacionado: n8n-YYYY-MM-DD_HHMM.db.gz (mantem ultimos 30)
TIMESTAMP=$(date +%Y-%m-%d_%H%M)
BACKUP_FILE="$BACKUP_DIR/n8n-${TIMESTAMP}.db.gz"

# SQLite .backup e' seguro mesmo com n8n rodando
sqlite3 "$N8N_DB" ".backup '$BACKUP_DIR/n8n-temp.db'" 2>> "$LOG_FILE"
gzip -c "$BACKUP_DIR/n8n-temp.db" > "$BACKUP_FILE"
rm -f "$BACKUP_DIR/n8n-temp.db"

# Limpar backups > 30 dias
DELETED=$(find "$BACKUP_DIR" -name "n8n-*.db.gz" -mtime +30 -delete -print | wc -l)
echo "Backup criado: $BACKUP_FILE ($(du -h "$BACKUP_FILE" | cut -f1))" >> "$LOG_FILE"
echo "Backups antigos removidos: $DELETED" >> "$LOG_FILE"
echo "Total de backups retidos: $(ls -1 "$BACKUP_DIR"/n8n-*.db.gz 2>/dev/null | wc -l)" >> "$LOG_FILE"
echo "Concluido: $(date '+%Y-%m-%d %H:%M:%S')" >> "$LOG_FILE"