upstream backend_app {
    server 127.0.0.1:13200;
    keepalive 32;
}

upstream frontend_web {
    server 127.0.0.1:13300;
    keepalive 16;
}

upstream tusd_backend {
    server 127.0.0.1:13400;
    keepalive 16;
}

# Access log format including request id
log_format reqid '$time_iso8601 [$req_id] $remote_addr "$request" $status $body_bytes_sent $request_time "$http_referer" "$http_user_agent"';

# Correlate/propagate request id; if client sent X-Request-Id use it, otherwise generate
map $http_x_request_id $req_id {
    default $http_x_request_id;
    ""      $request_id;
}

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

# CORS: reflect Origin if present (fixes credentials-mode restriction)
# If no Origin header -> do not send A-C-A-Origin
map $http_origin $cors_origin {
    ""                          "";
    ~^https?://[^/]+$           $http_origin;
}

server {
    listen 80;
    server_name my-public-node-8.projscale.dev;
    # Emit request id even on redirects
    add_header X-Request-Id $req_id always;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name my-public-node-8.projscale.dev;
    # Access log with request id
    access_log /var/log/nginx/access.log reqid;

    # SSL configuration (valid certs)
    ssl_certificate     /etc/letsencrypt/live/my-public-node-8.projscale.dev/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/my-public-node-8.projscale.dev/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets off;
    # add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

    # Общие параметры для стабильности и больших файлов
    client_max_body_size 10G;
    client_body_timeout 300s;
    client_header_timeout 300s;
    keepalive_timeout 65s;

    # Сжатие текстовых ответов
    gzip on;
    gzip_comp_level 5;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;

    # Безопасные заголовки (минимальный набор) и корреляция
    add_header X-Content-Type-Options nosniff always;
    add_header X-Frame-Options SAMEORIGIN always;
    add_header Referrer-Policy strict-origin-when-cross-origin always;
    add_header X-Request-Id $req_id always;

    # CORS: apply globally; specific locations may add extra Expose/Allow lists
    add_header Access-Control-Allow-Origin $cors_origin always;
    add_header Access-Control-Allow-Credentials "true" always;
    add_header Access-Control-Allow-Methods "GET, POST, PUT, PATCH, DELETE, OPTIONS, HEAD" always;
    add_header Access-Control-Allow-Headers "Origin, Cache-Control, Content-Type, Accept, Authorization, Referer, User-Agent, Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site, Tus-Resumable, tus-resumable, Upload-Length, upload-length, Upload-Offset, upload-offset, Upload-Metadata, upload-metadata, Upload-Defer-Length, upload-defer-length, Upload-Concat, upload-concat, x-file-name, x-last-chunk, x-chunk-start, x-upload-id, x-request-id" always;
    add_header Vary "Origin" always;

    # Статика фронтенда (SPA)
    location / {
        proxy_pass http://frontend_web;
        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_set_header X-Request-Id $req_id;
        proxy_read_timeout 60s;
    }

    # Агрессивное кеширование хешированных ассетов (Vite кладет их в /assets)
    location ^~ /assets/ {
        proxy_pass http://frontend_web;
        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_set_header X-Request-Id $req_id;
        proxy_read_timeout 60s;
        proxy_hide_header Cache-Control;
        add_header Cache-Control "public, max-age=31536000, immutable" always;
    }

    location = /tus {
        return 308 /tus/;
    }

    location /tus/ {
        # Proxy uploads to tusd with resumable-friendly settings
        proxy_pass http://tusd_backend/;
        proxy_http_version 1.1;
        proxy_request_buffering off;
        proxy_buffering off;
        proxy_max_temp_file_size 0;
        proxy_redirect off;
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
        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_set_header X-Forwarded-Host $host;
        proxy_set_header X-Request-Id $req_id;

        # CORS for tus
        add_header Access-Control-Allow-Origin $cors_origin always;
        add_header Access-Control-Allow-Credentials "true" always;
        add_header Access-Control-Allow-Methods "GET, POST, PATCH, HEAD, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Origin, Cache-Control, Content-Type, Accept, Authorization, Referer, User-Agent, Tus-Resumable, Upload-Length, Upload-Offset, Upload-Metadata, Upload-Defer-Length, Upload-Concat" always;
        add_header Access-Control-Expose-Headers "Location, Upload-Offset, Tus-Version, Tus-Resumable, Tus-Max-Size, Tus-Extension" always;
        add_header Vary "Origin" always;

        if ($request_method = OPTIONS) { return 204; }
    }

    location = /files {
        return 308 /files/;
    }

    location /files/ {
        # Direct file access through tusd (GET/HEAD support, resumable resume)
        proxy_pass http://tusd_backend;
        proxy_http_version 1.1;
        proxy_request_buffering off;
        proxy_buffering off;
        proxy_max_temp_file_size 0;
        proxy_redirect off;
        proxy_read_timeout 600s;
        proxy_send_timeout 600s;
        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_set_header X-Forwarded-Host $host;
        proxy_set_header X-Request-Id $req_id;

        # CORS for file GET/HEAD
        add_header Access-Control-Allow-Origin $cors_origin always;
        add_header Access-Control-Allow-Credentials "true" always;
        add_header Access-Control-Allow-Methods "GET, HEAD, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Origin, Cache-Control, Content-Type, Accept, Authorization, Referer, User-Agent" always;
        add_header Access-Control-Expose-Headers "Location, Upload-Offset, Tus-Version, Tus-Resumable, Tus-Max-Size, Tus-Extension" always;
        add_header Vary "Origin" always;

        if ($request_method = OPTIONS) { return 204; }
    }

    # API
    location /api/ {
        proxy_pass http://backend_app;
        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-Request-Id $req_id;

        # Для chunked uploads и стриминга – не буферизуем запрос/ответ
        proxy_http_version 1.1;
        proxy_request_buffering off;
        proxy_buffering off;
        proxy_max_temp_file_size 0;
        proxy_set_header Connection "";

        # Таймауты для больших файлов
        proxy_connect_timeout 300s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;

        # CORS for API
        add_header Access-Control-Allow-Origin $cors_origin always;
        add_header Access-Control-Allow-Credentials "true" always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, PATCH, DELETE, OPTIONS, HEAD" always;
        add_header Access-Control-Allow-Headers "Origin, Cache-Control, Content-Type, Accept, Authorization, Referer, User-Agent, Sec-Fetch-Dest, Sec-Fetch-Mode, Sec-Fetch-Site" always;
        add_header Vary "Origin" always;

        # Вебсокеты (на будущее)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;

        if ($request_method = OPTIONS) { return 204; }
    }

    # Health to backend
    location = /health {
        proxy_pass http://backend_app/api/system.version;
        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-Request-Id $req_id;
    }
}