#!/bin/bash

# Script to generate all nginx configurations for the project
# This ensures consistent configuration across all deployments

set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
OUTPUT_DIR="$SCRIPT_DIR/generated_configs"

echo "🔧 Generating nginx configurations..."
echo "Output directory: $OUTPUT_DIR"
echo ""

# Create output directory
mkdir -p "$OUTPUT_DIR"

# Function to generate nginx configuration for a service
generate_nginx_config() {
    local domain=$1
    local upstream_port=$2
    local service_name=$3
    local output_file="$OUTPUT_DIR/$domain.conf"

    echo "📝 Generating config for $domain (port $upstream_port)..."

    cat > "$output_file" << EOF
# Nginx configuration for $domain
# Generated by generate-nginx-configs.sh on $(date)
# Service: $service_name

server {
    listen 80;
    server_name $domain;
    return 301 https://\$server_name\$request_uri;
}

server {
    listen 443 ssl http2;
    server_name $domain;

    # SSL configuration
    ssl_certificate /etc/letsencrypt/live/mnemo-cards.online/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/mnemo-cards.online/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

EOF

    # Add service-specific settings
    case $service_name in
        vscode)
            cat >> "$output_file" << EOF
    # VSCode Server specific settings
    client_max_body_size 100M;

    # Static files - no rate limiting
    location ~ ^/(static|out|node_modules)/ {
        proxy_pass http://127.0.0.1:$upstream_port;
        proxy_set_header Host \$host;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto \$scheme;

        proxy_cache_valid 200 1h;
        add_header Cache-Control "public, max-age=3600";

        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Static file extensions - no rate limiting
    location ~ \.(js|css|woff|woff2|ttf|eot|png|jpg|jpeg|gif|svg|ico|webp|map|json)$ {
        proxy_pass http://127.0.0.1:$upstream_port;
        proxy_set_header Host \$host;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto \$scheme;

        proxy_cache_valid 200 1h;
        add_header Cache-Control "public, max-age=3600";

        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Main proxy location
    location / {
        proxy_pass http://127.0.0.1:$upstream_port;
        proxy_set_header Host \$host;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto \$scheme;

        proxy_http_version 1.1;
        proxy_set_header Upgrade \$http_upgrade;
        proxy_set_header Connection "upgrade";

        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        proxy_buffering off;
        proxy_request_buffering off;
    }
EOF
            ;;
        forgejo)
            cat >> "$output_file" << EOF
    # Forgejo (Git) specific settings
    client_max_body_size 100M;

    # Main proxy location
    location / {
        proxy_pass http://127.0.0.1:$upstream_port;
        proxy_set_header Host \$host;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto \$scheme;

        proxy_http_version 1.1;
        proxy_set_header Upgrade \$http_upgrade;
        proxy_set_header Connection "upgrade";

        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        proxy_buffering off;
        proxy_request_buffering off;
    }
EOF
            ;;
        webapp)
            cat >> "$output_file" << EOF
    # Web app specific settings
    client_max_body_size 1000M;

    root /var/www/mnemo_cards;
    index index.html;

    location / {
        try_files \$uri \$uri/ /index.html;
    }

    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # ACME challenge for certificate renewal
    location /.well-known/acme-challenge/ {
        root /var/www/html;
        try_files \$uri =404;
    }
EOF
            ;;
    esac

    # Close server block
    cat >> "$output_file" << EOF

    # Security - deny access to hidden files
    location ~ /\. {
        deny all;
    }
}
EOF

    echo "✅ Generated $output_file"
}

# Generate configurations for all services

# Main web application
generate_nginx_config "mnemo-cards.online" "" "webapp"

# VSCode Server
generate_nginx_config "vscode.mnemo-cards.online" "8443" "vscode"

# Forgejo (Git server)
generate_nginx_config "code.mnemo-cards.online" "3000" "forgejo"

echo ""
echo "📊 Validating generated configurations..."

# Test each configuration
for config in "$OUTPUT_DIR"/*.conf; do
    echo "Testing $(basename "$config")..."
    /usr/sbin/nginx -t -c /etc/nginx/nginx.conf -g "include $config;" 2>/dev/null && echo "✅ Valid" || echo "❌ Invalid"
done

echo ""
echo "✅ All configurations generated successfully!"
echo ""
echo "📁 Generated files in: $OUTPUT_DIR"
echo ""
echo "🚀 Use deploy-nginx-configs.sh to deploy these configurations to the server"