#!/bin/bash
# SkyView Database Auto-Update Script
# Safe for cron execution - updates only public domain sources

set -e

# Configuration
SKYVIEW_DATA_CMD="${SKYVIEW_DATA_CMD:-skyview-data}"
LOCK_FILE="${TMPDIR:-/tmp}/skyview-data-update.lock"
LOG_FILE="${LOG_FILE:-/var/log/skyview/database-update.log}"

# Colors for output (disabled if not a tty)
if [ -t 1 ]; then
    RED='\033[0;31m'
    GREEN='\033[0;32m'
    YELLOW='\033[1;33m'
    NC='\033[0m'
else
    RED=''
    GREEN=''
    YELLOW=''
    NC=''
fi

log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') $1" | tee -a "${LOG_FILE}" 2>/dev/null || echo "$(date '+%Y-%m-%d %H:%M:%S') $1"
}

error() {
    echo -e "${RED}ERROR: $1${NC}" >&2
    log "ERROR: $1"
}

success() {
    echo -e "${GREEN}$1${NC}"
    log "$1"
}

warn() {
    echo -e "${YELLOW}WARNING: $1${NC}"
    log "WARNING: $1"
}

# Check for lock file (prevent concurrent runs)
if [ -f "$LOCK_FILE" ]; then
    if kill -0 "$(cat "$LOCK_FILE")" 2>/dev/null; then
        error "Another instance is already running (PID: $(cat "$LOCK_FILE"))"
        exit 1
    else
        warn "Removing stale lock file"
        rm -f "$LOCK_FILE"
    fi
fi

# Create lock file
echo $$ > "$LOCK_FILE"
trap 'rm -f "$LOCK_FILE"' EXIT

log "Starting SkyView database update"

# Check if skyview-data command exists
if ! command -v "$SKYVIEW_DATA_CMD" >/dev/null 2>&1; then
    error "skyview-data command not found in PATH"
    exit 1
fi

# Update database (this will auto-initialize if needed)
log "Running: $SKYVIEW_DATA_CMD update"
if "$SKYVIEW_DATA_CMD" update; then
    success "Database update completed successfully"
    
    # Show status for logging
    "$SKYVIEW_DATA_CMD" status 2>/dev/null | while IFS= read -r line; do
        log "STATUS: $line"
    done
    
    exit 0
else
    error "Database update failed"
    exit 1
fi