# Apache Airflow - Workflow Orchestration
# Subpath: /airflow
# Backend: airflow-webserver:8080

location /airflow {
    # Remove /airflow prefix before forwarding
    rewrite ^/airflow(/.*)$ $1 break;
    
    # Forward to Airflow Webserver
    proxy_pass http://airflow-webserver:8080;
    
    # Preserve headers
    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 X-Forwarded-Host $host;
    
    # Important for Airflow subpath
    proxy_set_header X-Script-Name /airflow;
    
    # Session cookie handling
    proxy_cookie_path / /airflow/;
    
    # WebSocket support for real-time logs
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    
    # Timeouts (DAG runs can take time)
    proxy_connect_timeout 300s;
    proxy_send_timeout 300s;
    proxy_read_timeout 300s;
    
    # Buffer settings
    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;
}

# API endpoints
location /airflow/api {
    rewrite ^/airflow(/.*)$ $1 break;
    proxy_pass http://airflow-webserver:8080;
    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 X-Script-Name /airflow;
    proxy_cookie_path / /airflow/;
}

# Static files
location /airflow/static {
    rewrite ^/airflow(/.*)$ $1 break;
    proxy_pass http://airflow-webserver:8080;
    proxy_set_header Host $host;
    proxy_cache_valid 200 1d;
    add_header Cache-Control "public, immutable";
}

# Health check
location /airflow/health {
    rewrite ^/airflow(/.*)$ $1 break;
    proxy_pass http://airflow-webserver:8080;
    proxy_set_header Host $host;
}