#!/bin/bash
set -e

BACKUP_SCHEDULE="${BACKUP_SCHEDULE:-0 3 * * *}"
SKILL_DIR="$(dirname "$(dirname "$0")")"

# Validate password is set
if [ -z "$BACKUP_PASSWORD" ]; then
    echo "ERROR: BACKUP_PASSWORD is required"
    echo "Set BACKUP_PASSWORD environment variable to enable backups"
    exit 1
fi

# Setup cron job for scheduled backups
setup_cron() {
    local cron_file="/etc/cron.d/vibestack-backup"
    local backup_script="$SKILL_DIR/scripts/backup.sh"

    # Build environment exports for cron
    local env_exports=""
    env_exports+="BACKUP_PASSWORD='$BACKUP_PASSWORD' "
    env_exports+="BACKUP_TARGET='${BACKUP_TARGET:-/backups}' "
    env_exports+="BACKUP_RETENTION='${BACKUP_RETENTION:-7d}' "

    [ -n "$BACKUP_S3_ACCESS_KEY" ] && env_exports+="BACKUP_S3_ACCESS_KEY='$BACKUP_S3_ACCESS_KEY' "
    [ -n "$BACKUP_S3_SECRET_KEY" ] && env_exports+="BACKUP_S3_SECRET_KEY='$BACKUP_S3_SECRET_KEY' "
    [ -n "$BACKUP_B2_ACCOUNT_ID" ] && env_exports+="BACKUP_B2_ACCOUNT_ID='$BACKUP_B2_ACCOUNT_ID' "
    [ -n "$BACKUP_B2_ACCOUNT_KEY" ] && env_exports+="BACKUP_B2_ACCOUNT_KEY='$BACKUP_B2_ACCOUNT_KEY' "

    # Create cron job
    cat > "$cron_file" << EOF
# VibeStack automated backup
SHELL=/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

$BACKUP_SCHEDULE root $env_exports $backup_script >> /var/log/vibestack-backup.log 2>&1
EOF

    chmod 644 "$cron_file"
    echo "Cron job configured: $BACKUP_SCHEDULE"
}

# Write initial status
write_status() {
    cat > /run/vibestack/backup-status.json << EOF
{
  "status": "running",
  "schedule": "$BACKUP_SCHEDULE",
  "target": "${BACKUP_TARGET:-/backups}",
  "last_backup": null,
  "last_status": null
}
EOF
}

setup_cron
write_status

echo "Starting cron daemon for scheduled backups..."
echo "Schedule: $BACKUP_SCHEDULE"
echo "Target: ${BACKUP_TARGET:-/backups}"
echo ""
echo "Manual backup: $SKILL_DIR/scripts/backup.sh"
echo "Manual restore: $SKILL_DIR/scripts/restore.sh --list"

# Start cron in foreground
exec cron -f