#!/bin/bash
# IPMI Controller - Backup and Restore

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DATA_DIR="${DATA_DIR:-$SCRIPT_DIR/data}"
BACKUP_DIR="${BACKUP_DIR:-$SCRIPT_DIR/backups}"

show_help() {
    echo "IPMI Controller - Backup/Restore Tool"
    echo ""
    echo "Usage:"
    echo "  $0 backup              - Create backup"
    echo "  $0 restore [filename]  - Restore from backup"
    echo "  $0 list                - List available backups"
    echo "  $0 auto                - Auto-backup (cron-friendly)"
    echo ""
}

create_backup() {
    mkdir -p "$BACKUP_DIR"
    TIMESTAMP=$(date +%Y%m%d_%H%M%S)
    BACKUP_FILE="$BACKUP_DIR/ipmi-controller-backup-$TIMESTAMP.tar.gz"
    
    echo "📦 Creating backup..."
    tar -czf "$BACKUP_FILE" -C "$SCRIPT_DIR" data/ 2>/dev/null
    
    if [ $? -eq 0 ]; then
        echo "✅ Backup created: $BACKUP_FILE"
        echo ""
        ls -lh "$BACKUP_FILE"
    else
        echo "❌ Backup failed"
        exit 1
    fi
}

restore_backup() {
    if [ -z "$1" ]; then
        echo "❌ Please specify backup file"
        list_backups
        exit 1
    fi
    
    BACKUP_FILE="$BACKUP_DIR/$1"
    if [ ! -f "$BACKUP_FILE" ]; then
        BACKUP_FILE="$1"
    fi
    
    if [ ! -f "$BACKUP_FILE" ]; then
        echo "❌ Backup file not found: $1"
        exit 1
    fi
    
    echo "⚠️  This will overwrite current settings!"
    read -p "Are you sure? (yes/no): " confirm
    
    if [ "$confirm" != "yes" ]; then
        echo "Aborted"
        exit 0
    fi
    
    # Create safety backup first
    echo "📦 Creating safety backup..."
    mkdir -p "$BACKUP_DIR"
    TIMESTAMP=$(date +%Y%m%d_%H%M%S)
    tar -czf "$BACKUP_DIR/safety-backup-before-restore-$TIMESTAMP.tar.gz" -C "$SCRIPT_DIR" data/ 2>/dev/null
    
    # Stop service if running
    if systemctl is-active --quiet ipmi-controller 2>/dev/null; then
        echo "🛑 Stopping service..."
        sudo systemctl stop ipmi-controller
        WAS_RUNNING=true
    else
        WAS_RUNNING=false
    fi
    
    # Restore
    echo "📥 Restoring from backup..."
    tar -xzf "$BACKUP_FILE" -C "$SCRIPT_DIR"
    
    if [ $? -eq 0 ]; then
        echo "✅ Restore complete"
        
        # Restart service if it was running
        if [ "$WAS_RUNNING" = true ]; then
            echo "🚀 Starting service..."
            sudo systemctl start ipmi-controller
        fi
    else
        echo "❌ Restore failed"
        exit 1
    fi
}

list_backups() {
    echo "📂 Available backups:"
    echo ""
    
    if [ -d "$BACKUP_DIR" ] && [ "$(ls -A "$BACKUP_DIR")" ]; then
        ls -lh "$BACKUP_DIR"/*.tar.gz 2>/dev/null | awk '{print "  " $9 " (" $5 ")"}'
    else
        echo "  No backups found"
    fi
}

auto_backup() {
    # This is cron-friendly - keeps only last 30 days
    mkdir -p "$BACKUP_DIR"
    
    # Create backup
    TIMESTAMP=$(date +%Y%m%d_%H%M%S)
    BACKUP_FILE="$BACKUP_DIR/auto-backup-$TIMESTAMP.tar.gz"
    tar -czf "$BACKUP_FILE" -C "$SCRIPT_DIR" data/ 2>/dev/null
    
    # Clean old backups (keep last 30 days)
    find "$BACKUP_DIR" -name "auto-backup-*.tar.gz" -mtime +30 -delete 2>/dev/null
    
    echo "Auto-backup complete: $BACKUP_FILE"
}

case "${1:-}" in
    backup)
        create_backup
        ;;
    restore)
        restore_backup "$2"
        ;;
    list)
        list_backups
        ;;
    auto)
        auto_backup
        ;;
    help|--help|-h)
        show_help
        ;;
    *)
        show_help
        exit 1
        ;;
esac