#!/bin/bash

echo "🔍 Etsy Finance Tracker - Deployment Validation"
echo "=================================================="

# Check if Docker is available
echo "📦 Checking Docker availability..."
if command -v docker &> /dev/null; then
    echo "✅ Docker is available"
    docker --version
else
    echo "❌ Docker is not available or not in PATH"
    echo "💡 You may need to use Docker Desktop or another container interface"
fi

# Check if Docker Compose is available
echo ""
echo "🐙 Checking Docker Compose availability..."
if command -v docker-compose &> /dev/null; then
    echo "✅ docker-compose is available"
    docker-compose --version
elif docker compose version &> /dev/null 2>&1; then
    echo "✅ docker compose (newer version) is available"
    docker compose version
else
    echo "❌ Docker Compose is not available"
    echo "💡 You may need to use container interface deployment"
fi

# Check if required files exist
echo ""
echo "📁 Checking required files..."
files=(
    "Dockerfile"
    "docker-compose.deploy-local.yml"
    "docker-compose.deploy.yml"
    "docker-compose.simple.yml"
    "nginx.deploy.conf"
    "package.json"
    "client/package.json"
    "server/package.json"
)

for file in "${files[@]}"; do
    if [ -f "$file" ]; then
        echo "✅ $file exists"
    else
        echo "❌ $file is missing"
    fi
done

# Check for data directory
echo ""
echo "💾 Checking data persistence setup..."
if [ -d "data" ]; then
    echo "✅ data directory exists"
    echo "📂 Contents:"
    ls -la data/
else
    echo "⚠️  data directory doesn't exist, creating..."
    mkdir -p data/{mongo,uploads,logs,csv,pdf}
    echo "✅ data directory structure created"
fi

# Check port availability
echo ""
echo "🔌 Checking port availability..."
ports=(8080 8081)
for port in "${ports[@]}"; do
    if lsof -i :$port &> /dev/null; then
        echo "⚠️  Port $port is in use"
        echo "   Process using port $port:"
        lsof -i :$port
    else
        echo "✅ Port $port is available"
    fi
done

# Check disk space
echo ""
echo "💽 Checking disk space..."
available_space=$(df -h . | awk 'NR==2 {print $4}')
echo "Available space: $available_space"
if [[ $(df . | awk 'NR==2 {print $4}') -gt 2097152 ]]; then  # 2GB in KB
    echo "✅ Sufficient disk space available"
else
    echo "⚠️  Low disk space - may cause build failures"
fi

echo ""
echo "🎯 Deployment Recommendations:"
echo "================================"

# Docker available
if command -v docker &> /dev/null || command -v docker-compose &> /dev/null; then
    echo "🚀 You can use command-line deployment:"
    if command -v docker-compose &> /dev/null; then
        echo "   docker-compose -f docker-compose.deploy-local.yml up --build"
    else
        echo "   docker compose -f docker-compose.deploy-local.yml up --build"
    fi
else
    echo "🖥️  Use container interface deployment:"
    echo "   1. Open Docker Desktop, Portainer, or similar tool"
    echo "   2. Import docker-compose.deploy-local.yml"
    echo "   3. Deploy the stack"
fi

echo ""
echo "📚 For detailed instructions, see:"
echo "   - DEPLOYMENT_GUIDE.md (comprehensive guide)"
echo "   - CONTAINER_INTERFACE_DEPLOYMENT.md (GUI deployment)"

echo ""
echo "🌐 After successful deployment:"
echo "   - Frontend: http://localhost:8081"
echo "   - API: http://localhost:8081/api"
echo "   - Health Check: http://localhost:8081/api/health"

echo ""
echo "✅ Validation complete!"