# Nginx configuration for performance appraisal system
# This file will be mounted into nginx container

events {
    worker_connections 1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    # Logging
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log main;
    error_log   /var/log/nginx/error.log warn;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;

    # Real IP configuration for proxy (ESA HTTPS proxy)
    real_ip_header X-Forwarded-For;
    set_real_ip_from 0.0.0.0/0;  # Trust all proxies (adjust if you know ESA proxy IPs)

    # Server block for domain
    server {
        listen 80;
        server_name performance-appraisal.excn.top;

        # Redirect to HTTPS if request came via HTTP (not from ESA proxy)
        if ($http_x_forwarded_proto = "http") {
            return 301 https://$server_name$request_uri;
        }

        # Frontend React development server (via Docker network)
        location / {
            proxy_pass http://frontend:3000;
            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 $http_x_forwarded_proto;

            # WebSocket support for hot reload (development)
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

        # Backend API reverse proxy
        location /api/ {
            proxy_pass http://backend:3001/;
            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 $http_x_forwarded_proto;

            # Increase timeout for long-running AI requests
            proxy_read_timeout 120s;
            proxy_connect_timeout 15s;
            proxy_send_timeout 15s;
        }

        # Static assets (if any)
        location /assets/ {
            proxy_pass http://frontend:3000/assets/;
            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 $http_x_forwarded_proto;

            # Cache static assets
            expires 30d;
            add_header Cache-Control "public, immutable";
        }

        # Health check endpoint
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }
    }

    # Optional: Redirect www to non-www
    server {
        listen 80;
        server_name www.performance-appraisal.excn.top;
        return 301 https://performance-appraisal.excn.top$request_uri;
    }
}