#!/bin/bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
INFRA_DIR="$(dirname "$SCRIPT_DIR")"
BACKUP_DIR="${INFRA_DIR}/backups"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_PATH="${BACKUP_DIR}/${TIMESTAMP}"

mkdir -p "${BACKUP_PATH}"

echo "=== EifelDC Backup ==="
echo "Backup directory: ${BACKUP_PATH}"
echo ""

if command -v docker &>/dev/null && docker compose -f "${INFRA_DIR}/docker-compose.yml" ps &>/dev/null 2>&1; then
    echo "[Docker Mode]"

    echo "[1/4] Backing up PostgreSQL..."
    docker compose -f "${INFRA_DIR}/docker-compose.yml" exec -T postgres \
        pg_dump -U synapse synapse > "${BACKUP_PATH}/synapse_db.sql"

    echo "[2/4] Backing up Synapse media..."
    docker cp eifeldc-synapse:/data/media_store "${BACKUP_PATH}/media_store" 2>/dev/null || true

    echo "[3/4] Backing up Synapse config..."
    docker cp eifeldc-synapse:/data/homeserver.yaml "${BACKUP_PATH}/homeserver.yaml" 2>/dev/null || true
    docker cp eifeldc-synapse:/data/signing.key "${BACKUP_PATH}/signing.key" 2>/dev/null || true

    echo "[4/4] Backing up environment config..."
    cp "${INFRA_DIR}/.env" "${BACKUP_PATH}/.env" 2>/dev/null || true
else
    echo "[Native Mode]"

    echo "[1/3] Backing up PostgreSQL..."
    sudo -u postgres pg_dump synapse > "${BACKUP_PATH}/synapse_db.sql" 2>/dev/null || echo "Warning: Could not dump database"

    echo "[2/3] Backing up Synapse data..."
    SYNAPSE_DIR="${SYNAPSE_DIR:-/opt/eifeldc/synapse-data}"
    cp -r "${SYNAPSE_DIR}/homeserver.yaml" "${BACKUP_PATH}/" 2>/dev/null || true
    cp -r "${SYNAPSE_DIR}/signing.key" "${BACKUP_PATH}/" 2>/dev/null || true
    cp -r "${SYNAPSE_DIR}/media_store" "${BACKUP_PATH}/" 2>/dev/null || true

    echo "[3/3] Backing up environment config..."
    cp "${INFRA_DIR}/.env" "${BACKUP_PATH}/.env" 2>/dev/null || true
fi

COMPRESSED="${BACKUP_DIR}/eifeldc_backup_${TIMESTAMP}.tar.gz"
tar -czf "${COMPRESSED}" -C "${BACKUP_DIR}" "${TIMESTAMP}"
rm -rf "${BACKUP_PATH}"

echo ""
echo "Backup saved: ${COMPRESSED}"
echo ""

KEEP_COUNT=7
ls -t "${BACKUP_DIR}"/eifeldc_backup_*.tar.gz 2>/dev/null | tail -n +$((KEEP_COUNT + 1)) | xargs -r rm --
echo "Old backups cleaned (keeping latest ${KEEP_COUNT})"
echo "Done!"