#!/bin/bash
# Dealspace Backup Script
# Runs daily via cron, keeps last 30 backups

set -e

BACKUP_DIR=/opt/dealspace/backups
DB_PATH=/opt/dealspace/data/dealspace.db
LOG_FILE=/opt/dealspace/logs/backup.log
NTFY_URL="https://ntfy.inou.com/inou-alerts"
NTFY_TOKEN="tk_k120jegay3lugeqbr9fmpuxdqmzx5"
RETENTION_DAYS=30

TIMESTAMP=$(date +%Y%m%d-%H%M%S)
BACKUP_FILE="dealspace-${TIMESTAMP}.db"
BACKUP_PATH="${BACKUP_DIR}/${BACKUP_FILE}"

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

alert() {
    curl -sf "${NTFY_URL}" \
        -H "Authorization: Bearer ${NTFY_TOKEN}" \
        -H "Title: Dealspace Backup FAILED" \
        -H "Priority: high" \
        -H "Tags: warning" \
        -d "$1" || true
}

log "Starting backup..."

# Check if database exists
if [ ! -f "$DB_PATH" ]; then
    MSG="Database not found: $DB_PATH"
    log "ERROR: $MSG"
    alert "$MSG"
    exit 1
fi

# Perform SQLite backup (hot backup, safe with WAL)
if ! sqlite3 "$DB_PATH" ".backup '$BACKUP_PATH'"; then
    MSG="SQLite backup command failed"
    log "ERROR: $MSG"
    alert "$MSG"
    exit 1
fi

# Verify backup was created
if [ ! -f "$BACKUP_PATH" ]; then
    MSG="Backup file not created: $BACKUP_PATH"
    log "ERROR: $MSG"
    alert "$MSG"
    exit 1
fi

# Compress backup
if ! gzip "$BACKUP_PATH"; then
    MSG="Failed to compress backup"
    log "ERROR: $MSG"
    alert "$MSG"
    exit 1
fi

BACKUP_SIZE=$(du -h "${BACKUP_PATH}.gz" | cut -f1)
log "Backup created: ${BACKUP_FILE}.gz ($BACKUP_SIZE)"

# Clean up old backups (keep last 30)
OLD_COUNT=$(find "$BACKUP_DIR" -name "dealspace-*.db.gz" -type f -mtime +$RETENTION_DAYS | wc -l)
if [ "$OLD_COUNT" -gt 0 ]; then
    find "$BACKUP_DIR" -name "dealspace-*.db.gz" -type f -mtime +$RETENTION_DAYS -delete
    log "Deleted $OLD_COUNT old backups (older than $RETENTION_DAYS days)"
fi

# Count remaining backups
BACKUP_COUNT=$(find "$BACKUP_DIR" -name "dealspace-*.db.gz" -type f | wc -l)
log "Backup complete. $BACKUP_COUNT backups retained."