# Шаблон обрабатывается envsubst при старте контейнера nginx (переменные: API_UPSTREAM).
# HTTPS терминирует внешний прокси: Caddy из compose.tls.yaml или ваш собственный — см. docs/install-guide.md.

# За внешним прокси (Caddy, Traefik, ...) сохраняем исходную схему и IP клиента.
map $http_x_forwarded_proto $pipu_scheme {
    default $http_x_forwarded_proto;
    ''      $scheme;
}

upstream pipu_api {
    server ${API_UPSTREAM};
    keepalive 16;
}

server {
    listen 80;
    server_name _;

    # Доверяем X-Forwarded-For только от частных сетей (docker, LAN), где стоит прокси.
    set_real_ip_from 10.0.0.0/8;
    set_real_ip_from 172.16.0.0/12;
    set_real_ip_from 192.168.0.0/16;
    real_ip_header X-Forwarded-For;
    real_ip_recursive on;

    root /usr/share/nginx/html;
    # Two images (album cover + artist portrait), each up to 8 MiB before base64.
    client_max_body_size 32m;

    include /etc/nginx/snippets/security-headers.conf;

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;

    location /api/ {
        proxy_pass http://pipu_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 $pipu_scheme;
        # api берёт IP клиента только из X-Real-IP; остальные заголовки клиент может подделать
        proxy_set_header True-Client-IP "";
    }

    location = /healthz { proxy_pass http://pipu_api; }
    location = /readyz  { proxy_pass http://pipu_api; }

    # Аудио и обложки отдаёт nginx по заголовку X-Accel-Redirect от api (docs/playback.md).
    location /_internal/library/ { internal; alias /library/;          sendfile on; aio threads; }
    location /_internal/library-host/ { internal; alias /library-host/; sendfile on; aio threads; }
    location /_internal/cache/   { internal; alias /cache/transcode/;  sendfile on; }
    location /_internal/covers/  { internal; alias /cache/covers/;     expires 30d; }
    location /_internal/uploads/ { internal; alias /uploads/;          sendfile on; }

    location /assets/ {
        expires 1y;
        include /etc/nginx/snippets/security-headers.conf;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    location / {
        include /etc/nginx/snippets/security-headers.conf;
        add_header Cache-Control "no-cache";
        try_files $uri $uri/ /index.html;
    }
}