# =============================================================================
# Gateway nginx configuration for Paca
# =============================================================================
#
# Single public entrypoint for the Paca stack:
#   /api/*    →  REST API service
#   /ws/*     →  Realtime service (Socket.IO)
#   /storage/* → MinIO object storage
#   /*        →  Web application (SPA)
#
# Mounted as /etc/nginx/conf.d/default.conf inside the nginx container.

# -- Rate-limit zones ---------------------------------------------------------
limit_req_zone $binary_remote_addr zone=api:10m rate=100r/s;

# -- WebSocket connection upgrade map -----------------------------------------
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

# Resolve Docker service names for variable-based proxy_pass targets.
resolver 127.0.0.11 ipv6=off valid=30s;

# -- Upstream pools -----------------------------------------------------------
upstream api_backend {
    server paca-api:8080;
    keepalive 32;
}

upstream realtime_backend {
    server paca-realtime:3001;
    keepalive 16;
}

# =============================================================================
server {
    listen 80;
    server_name _;

    server_tokens off;
    client_max_body_size 10m;

    # -- Compression ----------------------------------------------------------
    gzip on;
    gzip_proxied any;
    gzip_comp_level 5;
    gzip_min_length 256;
    gzip_types
        application/javascript
        application/json
        application/wasm
        font/woff
        font/woff2
        image/svg+xml
        text/css
        text/plain;

    # -- Security headers -----------------------------------------------------
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    add_header X-XSS-Protection "0" always;

    # =========================================================================
    # Routing
    # =========================================================================

    # -- Object storage (MinIO) -----------------------------------------------
    location /storage/ {
        set $minio_backend http://paca-minio:9000;
        rewrite ^/storage/(.*)$ /$1 break;
        proxy_pass $minio_backend;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_set_header Host minio:9000;
        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;
        client_max_body_size 0;
        proxy_request_buffering off;
        proxy_connect_timeout 10s;
        proxy_send_timeout 120s;
        proxy_read_timeout 120s;
    }

    # -- Realtime service (Socket.IO) -----------------------------------------
    location /ws/ {
        proxy_pass http://realtime_backend/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        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_connect_timeout 10s;
        proxy_send_timeout 60s;
        proxy_read_timeout 3600s;
    }

    # -- API routes -----------------------------------------------------------
    location /api/ {
        limit_req zone=api burst=50 nodelay;
        limit_req_status 429;

        proxy_pass http://api_backend/api/;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        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_connect_timeout 10s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
    }

    # -- Local plugin frontend assets -----------------------------------------
    location /plugins/ {
        alias /var/www/plugins/;
        autoindex off;
        types {
            application/javascript js;
            application/wasm wasm;
            text/css css;
            text/html html;
            image/svg+xml svg;
            font/woff woff;
            font/woff2 woff2;
        }
        add_header Cache-Control "public, max-age=900, immutable" always;
    }

    # -- MCP plugin bundles ---------------------------------------------------
    location /plugins-mcp/ {
        alias /var/www/plugins-mcp/;
        autoindex off;
        types {
            application/javascript js;
        }
        add_header Cache-Control "public, max-age=900, immutable" always;
    }

    # -- Web application (SPA) ------------------------------------------------
    location / {
        set $web_backend http://paca-web:3000;
        proxy_pass $web_backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        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_connect_timeout 10s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
    }
}