# Nginx配置 - IOPaint API服务

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

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

    # 日志格式
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    'rt=$request_time uct="$upstream_connect_time" '
                    'uht="$upstream_header_time" urt="$upstream_response_time"';

    access_log /var/log/nginx/access.log main;

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    # 客户端配置
    client_max_body_size 20M;  # 允许上传最大20MB
    client_body_timeout 60s;
    client_header_timeout 60s;

    # Gzip压缩
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml text/javascript application/json application/javascript application/xml+rss;

    # 限流配置（防止API滥用）
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
    limit_req_status 429;

    # Upstream配置
    upstream api_backend {
        server api:8080;
        keepalive 32;
    }

    # HTTP服务器（重定向到HTTPS）
    server {
        listen 80;
        server_name _;

        # 健康检查端点（不需要HTTPS）
        location /api/v1/health {
            proxy_pass http://api_backend;
        }

        # 其他请求重定向到HTTPS
        location / {
            return 301 https://$host$request_uri;
        }
    }

    # HTTPS服务器
    server {
        listen 443 ssl http2;
        server_name your-domain.com;  # 替换为你的域名

        # SSL证书配置
        ssl_certificate /etc/nginx/ssl/cert.pem;
        ssl_certificate_key /etc/nginx/ssl/key.pem;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;

        # API路由
        location /api/ {
            # 限流：每秒10个请求，突发20个
            limit_req zone=api_limit burst=20 nodelay;

            # 代理设置
            proxy_pass http://api_backend;
            proxy_http_version 1.1;
            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_set_header Connection "";

            # 超时设置（图片处理可能较慢）
            proxy_connect_timeout 60s;
            proxy_send_timeout 120s;
            proxy_read_timeout 120s;

            # 缓冲区设置
            proxy_buffering off;
            proxy_request_buffering off;
        }

        # 文档路由
        location ~ ^/(docs|redoc|openapi.json) {
            proxy_pass http://api_backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # 根路径
        location / {
            proxy_pass http://api_backend;
            proxy_set_header Host $host;
        }

        # 自定义错误页面
        error_page 429 /429.html;
        location = /429.html {
            internal;
            default_type application/json;
            return 429 '{"error": "Too Many Requests", "detail": "Rate limit exceeded. Please try again later."}';
        }

        error_page 502 503 504 /50x.html;
        location = /50x.html {
            internal;
            default_type application/json;
            return 503 '{"error": "Service Unavailable", "detail": "The service is temporarily unavailable. Please try again later."}';
        }
    }
}