#!/bin/bash
# Gitea Dump Backup Script
# Backs up Gitea using the native 'gitea dump' command and transfers to remote storage

set -euo pipefail

# Configuration
BACKUP_DIR="./gitea-backups"
REMOTE_HOST="workstation"
REMOTE_PATH="/mnt/data/git-backups"
REMOTE_USER="${REMOTE_USER:-$(whoami)}"
CONTAINER_NAME="${CONTAINER_NAME:-gitea}"
KEEP_LOCAL="${KEEP_LOCAL:-3}"
LOG_FILE="${LOG_FILE:-/var/log/gitea-backup.log}"

# Timestamps
DATE=$(date +%Y%m%d)
TIMESTAMP=$(date +%Y%m%d_%H%M%S)

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"
}

error() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] ERROR: $*" | tee -a "$LOG_FILE" >&2
    exit 1
}

# Ensure local backup directory exists
mkdir -p "$BACKUP_DIR"

log "Starting Gitea backup process..."

# Step 1: Execute gitea dump inside the container
log "Creating Gitea dump inside container..."
CONTAINER_DUMP_PATH="/data/gitea-dump-${TIMESTAMP}.zip"

docker exec -u 1000 -i "$CONTAINER_NAME" bash -c "/app/gitea/gitea dump -c /data/gitea/conf/app.ini -f ${CONTAINER_DUMP_PATH}" \
    || error "Failed to execute gitea dump command"

log "Dump created in container at: $CONTAINER_DUMP_PATH"

# Step 2: Copy the archive from container to host
LOCAL_BACKUP="${BACKUP_DIR}/gitea-dump-${TIMESTAMP}.zip"
log "Copying backup from container to host..."

docker cp "${CONTAINER_NAME}:${CONTAINER_DUMP_PATH}" "$LOCAL_BACKUP" \
    || error "Failed to copy backup from container"

log "Backup saved locally: $LOCAL_BACKUP"

# Step 3: Clean up the dump file inside the container
log "Cleaning up container dump file..."
docker exec "$CONTAINER_NAME" rm -f "$CONTAINER_DUMP_PATH" || log "Warning: Failed to clean up container dump file (non-fatal)"

# Step 4: Upload to remote workstation
log "Uploading backup to remote storage (${REMOTE_HOST}:${REMOTE_PATH})..."
if ssh "$REMOTE_USER@$REMOTE_HOST" "test -d $REMOTE_PATH"; then
    rsync -avz --progress "$LOCAL_BACKUP" "${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PATH}/" \
        || error "Failed to upload backup to remote storage"
    log "Backup uploaded successfully"
else
    error "Remote backup directory does not exist: ${REMOTE_HOST}:${REMOTE_PATH}"
fi

# Step 5: Clean up old local backups (keep only KEEP_LOCAL most recent)
log "Cleaning up old local backups (keeping last $KEEP_LOCAL)..."
cd "$BACKUP_DIR" || error "Cannot access backup directory"
ls -t gitea-dump-*.zip 2>/dev/null | tail -n +$((KEEP_LOCAL + 1)) | xargs -r rm -f
log "Local cleanup complete"

# Final status
log "Backup completed successfully!"
log "Backup file: $(ls -lh "$LOCAL_BACKUP" | awk '{print $5, $9}')"

exit 0