#!/bin/bash
# Daily PostgreSQL backup to R2 (14-day retention)
# Schedule: cron daily. Requires: pg_dump, aws CLI or rclone for R2.
set -e

BACKUP_DIR="${BACKUP_DIR:-/tmp/linearvoid-backups}"
RETENTION_DAYS="${RETENTION_DAYS:-14}"
R2_BUCKET="${R2_BUCKET:-linearvoid-backups}"
DB_URL="${DATABASE_URL:-postgres://linearvoid:linearvoid@db:5432/linearvoid?sslmode=disable}"

TIMESTAMP=$(date +%Y%m%d)
BACKUP_FILE="$BACKUP_DIR/daily/db_${TIMESTAMP}.dump"

mkdir -p "$(dirname "$BACKUP_FILE")"

echo "[$(date -Iseconds)] Starting daily backup..."

# Extract connection details from DATABASE_URL
DB_HOST=$(echo "$DB_URL" | sed -n 's/.*@\([^:]*\).*/\1/p')
DB_PORT=$(echo "$DB_URL" | sed -n 's/.*:\([0-9]*\)\/.*/\1/p')
DB_USER=$(echo "$DB_URL" | sed -n 's/.*:\/\/\([^:]*\).*/\1/p')
DB_NAME=$(echo "$DB_URL" | sed -n 's/.*\/\([^?]*\).*/\1/p')
DB_PASS=$(echo "$DB_URL" | sed -n 's/.*:\/\/[^:]*:\([^@]*\).*/\1/p')

export PGPASSWORD="${DB_PASS}"

# Dump
pg_dump -h "${DB_HOST:-db}" -p "${DB_PORT:-5432}" -U "${DB_USER:-linearvoid}" \
        -Fc -f "$BACKUP_FILE" "${DB_NAME:-linearvoid}"

echo "  Backup: $BACKUP_FILE ($(du -h "$BACKUP_FILE" | cut -f1))"

# Upload to R2
if [ -n "$R2_ENDPOINT" ] && [ -n "$R2_ACCESS_KEY_ID" ]; then
    aws s3 cp "$BACKUP_FILE" "s3://${R2_BUCKET}/daily/db_${TIMESTAMP}.dump" \
        --endpoint-url "$R2_ENDPOINT" --no-verify-ssl 2>/dev/null && \
        echo "  Uploaded to R2: daily/db_${TIMESTAMP}.dump" || \
        echo "  WARNING: R2 upload failed"
fi

# Cleanup old backups
find "$BACKUP_DIR/daily" -name "db_*.dump" -mtime "+${RETENTION_DAYS}" -delete 2>/dev/null || true
echo "  Cleaned up backups older than ${RETENTION_DAYS} days"

echo "[$(date -Iseconds)] Daily backup complete."