#!/bin/bash

###############################################################################
# Quick Setup for Database Backups (Alex User)
# This script sets up the backup crontab for the alex user
###############################################################################

set -euo pipefail

SCRIPT_DIR="/mnt/HC_Volume_103713257/tilbudgivern/scripts"
BACKUP_SCRIPT="$SCRIPT_DIR/backup-databases.sh"
PROJECT_DIR="/mnt/HC_Volume_103713257/tilbudgivern"
ENV_FILE="$PROJECT_DIR/backend/.env"

echo "=========================================="
echo "Database Backup Setup for Alex User"
echo "=========================================="
echo ""

# Check if running as alex
CURRENT_USER=$(whoami)
if [ "$CURRENT_USER" != "alex" ]; then
    echo "⚠️  Warning: You are running as '$CURRENT_USER', not 'alex'"
    echo "   This setup is designed for the alex user"
    echo ""
    read -p "Continue anyway? (y/n) " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 1
    fi
fi

echo "Current user: $CURRENT_USER"
echo ""

# Check if backup script exists
if [ ! -f "$BACKUP_SCRIPT" ]; then
    echo "❌ Error: Backup script not found at $BACKUP_SCRIPT"
    exit 1
fi

# Make backup script executable
echo "📝 Setting execute permissions on backup script..."
chmod +x "$BACKUP_SCRIPT"
echo "✅ Done"
echo ""

# Create directories with proper permissions
echo "📁 Creating backup directories..."
mkdir -p "$PROJECT_DIR/backups"
mkdir -p "$PROJECT_DIR/logs/backups"
chmod 755 "$PROJECT_DIR/backups"
chmod 755 "$PROJECT_DIR/logs/backups"
echo "✅ Done"
echo ""

# Check if .env exists and has backup vars
if [ ! -f "$ENV_FILE" ]; then
    echo "❌ Error: .env file not found at $ENV_FILE"
    exit 1
fi

if ! grep -q "DB_BACKUP_USER" "$ENV_FILE"; then
    echo "⚠️  Warning: DB_BACKUP_USER not found in .env"
    echo "   Please add these variables to .env:"
    echo "   DB_BACKUP_USER=tilbudgivern_service"
    echo "   DB_BACKUP_PASSWORD=REDACTED_PASSWORD"
    echo "   DB_BACKUP_HOST=127.0.0.1"
    exit 1
fi

echo "✅ Database credentials found in .env"
echo ""

# Test database connection
echo "🔌 Testing database connection..."
if source "$ENV_FILE" && mysql -u "$DB_BACKUP_USER" -p"$DB_BACKUP_PASSWORD" -h "$DB_BACKUP_HOST" -e "SHOW DATABASES;" &>/dev/null; then
    echo "✅ Database connection successful"
else
    echo "⚠️  Warning: Could not connect to database"
    echo "   Database credentials may be incorrect"
    read -p "Continue anyway? (y/n) " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 1
    fi
fi
echo ""

# Ask user for cron schedule
echo "Select backup schedule:"
echo "1) Daily at 02:00 (recommended)"
echo "2) Daily at 00:00 (midnight)"
echo "3) Daily at 03:00"
echo "4) Every 6 hours"
echo "5) Custom cron expression"
read -p "Choose (1-5): " choice

case $choice in
    1)
        CRON_EXPR="0 2 * * *"
        DESCRIPTION="Daily at 02:00"
        ;;
    2)
        CRON_EXPR="0 0 * * *"
        DESCRIPTION="Daily at 00:00"
        ;;
    3)
        CRON_EXPR="0 3 * * *"
        DESCRIPTION="Daily at 03:00"
        ;;
    4)
        CRON_EXPR="0 */6 * * *"
        DESCRIPTION="Every 6 hours"
        ;;
    5)
        read -p "Enter cron expression: " CRON_EXPR
        DESCRIPTION="Custom: $CRON_EXPR"
        ;;
    *)
        echo "❌ Invalid choice"
        exit 1
        ;;
esac

echo ""
echo "⚙️  Setting up crontab..."
echo "Schedule: $DESCRIPTION"
echo "Command: $BACKUP_SCRIPT"
echo ""

# Check if cron job already exists
if crontab -l 2>/dev/null | grep -q "backup-databases.sh"; then
    echo "⚠️  Cron job already exists. Updating..."
    # Remove old job and add new one
    (crontab -l 2>/dev/null | grep -v "backup-databases.sh"; echo "# Database backup - $DESCRIPTION"; echo "$CRON_EXPR $BACKUP_SCRIPT") | crontab -
else
    # Add new cron job
    (crontab -l 2>/dev/null || echo ""; echo "# Database backup - $DESCRIPTION"; echo "$CRON_EXPR $BACKUP_SCRIPT") | crontab -
fi

echo "✅ Crontab updated successfully"
echo ""

# Verify crontab
echo "Current crontab entries for backups:"
echo "---"
crontab -l 2>/dev/null | grep -i backup || echo "No backup entries found"
echo "---"
echo ""

# Offer to test manually
echo "Run first backup test?"
read -p "Test backup now? (y/n) " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
    echo ""
    echo "Running backup test..."
    echo "---"
    if source "$ENV_FILE" && $BACKUP_SCRIPT; then
        echo "---"
        echo "✅ Backup test successful!"
    else
        echo "---"
        echo "❌ Backup test failed. Check the error above."
        exit 1
    fi
fi

echo ""
echo "=========================================="
echo "Setup Complete!"
echo "=========================================="
echo ""
echo "Backup information:"
echo "  Backup directory: $PROJECT_DIR/backups"
echo "  Log file:         $PROJECT_DIR/logs/backups/backup.log"
echo "  Retention:        7 days (auto-rotation)"
echo "  Schedule:         $DESCRIPTION"
echo ""
echo "Useful commands:"
echo "  View backups:      ls -lh $PROJECT_DIR/backups/"
echo "  View logs:         tail -f $PROJECT_DIR/logs/backups/backup.log"
echo "  Check crontab:     crontab -l"
echo "  Manual backup:     $BACKUP_SCRIPT"
echo ""
echo "Next time you login, backups will run automatically!"