#!/bin/bash
# Sync ralpha-ue5 assets on droplet boot
# Called by systemd service before launching UE5

set -e

REPO_DIR="${RALPHA_UE5_DIR:-/opt/ralpha-ue5}"
CATALOGUE_PATH="$REPO_DIR/RalphaData/catalogue/catalogue.json"
HASH_FILE="/var/lib/ralpha/catalogue-hash"
LOG_FILE="/var/log/ralpha/sync.log"

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

mkdir -p "$(dirname "$LOG_FILE")"
mkdir -p "$(dirname "$HASH_FILE")"

log "Starting ralpha-ue5 sync..."

cd "$REPO_DIR"

# Store previous catalogue hash
PREV_HASH=""
if [ -f "$HASH_FILE" ]; then
    PREV_HASH=$(cat "$HASH_FILE")
fi

# Fetch and pull latest
log "Fetching from origin..."
git fetch origin

# Check if we're behind
LOCAL=$(git rev-parse HEAD)
REMOTE=$(git rev-parse origin/master 2>/dev/null || git rev-parse origin/main)

if [ "$LOCAL" != "$REMOTE" ]; then
    log "Updates available, pulling..."
    git pull --ff-only

    # Pull LFS objects for new/changed files
    log "Pulling LFS objects..."
    git lfs pull

    log "Pull complete."
else
    log "Already up to date."
fi

# Check catalogue hash
if [ -f "$CATALOGUE_PATH" ]; then
    CURRENT_HASH=$(jq -r '.catalogue_hash // empty' "$CATALOGUE_PATH" 2>/dev/null || echo "unknown")
    echo "$CURRENT_HASH" > "$HASH_FILE"

    if [ "$PREV_HASH" != "$CURRENT_HASH" ]; then
        log "Catalogue updated: $PREV_HASH -> $CURRENT_HASH"
        # Could trigger cache invalidation or notify MCP server here
    else
        log "Catalogue unchanged: $CURRENT_HASH"
    fi
else
    log "Warning: Catalogue not found at $CATALOGUE_PATH"
fi

log "Sync complete."