#!/bin/bash
#
# Hytale Server Update Script
# Runs the updater, extracts new files, and restarts the server
#

set -e

HYTALE_DIR="/opt/hytale"
LOG_FILE="/var/log/hytale-update.log"

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

cd "$HYTALE_DIR"

log "Starting update check..."

# Run the updater to check for and download updates
# The updater downloads files like "2026.01.17-abcdef.zip"
DOWNLOADER_OUTPUT=$(./hytale-downloader-linux-amd64 2>&1 | tee -a "$LOG_FILE")

# Check if the downloader itself needs an update
if echo "$DOWNLOADER_OUTPUT" | grep -q "A new version of hytale-downloader is available"; then
    log "Downloading new version of hytale-downloader..."
    curl -sL -o hytale-downloader.zip "https://downloader.hytale.com/hytale-downloader.zip"
    unzip -o hytale-downloader.zip -d "$HYTALE_DIR"
    chmod +x "$HYTALE_DIR/hytale-downloader-linux-amd64"
    rm -f hytale-downloader.zip
    log "Downloader updated successfully."
fi

# Find the newest zip file (pattern: YYYY.MM.DD-*.zip)
NEWEST_ZIP=$(ls -t [0-9][0-9][0-9][0-9].[0-9][0-9].[0-9][0-9]-*.zip 2>/dev/null | head -n1)

if [ -z "$NEWEST_ZIP" ]; then
    log "No update zip found. Nothing to do."
    exit 0
fi

# Check if this update was already applied
APPLIED_MARKER=".applied_updates"
if grep -Fxq "$NEWEST_ZIP" "$APPLIED_MARKER" 2>/dev/null; then
    log "Update $NEWEST_ZIP was already applied. Skipping."
    exit 0
fi

log "New update found: $NEWEST_ZIP"

# Stop the server
log "Stopping Hytale server..."
systemctl stop hytale.service || true

# Wait for server to fully stop
sleep 5

# Extract the update directly to /opt/hytale
log "Extracting $NEWEST_ZIP to $HYTALE_DIR..."
unzip -o "$NEWEST_ZIP" -d "$HYTALE_DIR"

# Fix file ownership (since this script runs as root)
chown -R mars3142:mars3142 "$HYTALE_DIR"

# Mark this update as applied
echo "$NEWEST_ZIP" >> "$APPLIED_MARKER"

# Start the server again
log "Starting Hytale server..."
systemctl start hytale.service

# Cleanup: keep only the 3 newest zip files
log "Cleaning up old zip files..."
ls -t [0-9][0-9][0-9][0-9].[0-9][0-9].[0-9][0-9]-*.zip 2>/dev/null | tail -n +4 | xargs -r rm -f

log "Update complete!"