# Map for proper WebSocket upgrade handling on the proxied locations below.
# Without this, hardcoding `proxy_set_header Connection "upgrade"` puts nginx
# into tunnel-mode for every request — which silently drops response headers
# including Set-Cookie. That broke session-cookie auth on /api/v1/auth/login:
# mam-api was issuing the cookie, web-ui's proxy was eating it before it
# reached the browser. With this map, Connection is only set to "upgrade"
# when the client actually requested an Upgrade (real WebSocket); otherwise
# it's "close" and the response flows through normally.
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
    listen 80;
    server_name _;

    # Docker embedded DNS — defers upstream resolution to request time
    # This prevents nginx crashing at startup if sibling containers aren't
    # ready yet (which happens on the first `docker compose up`).
    resolver 127.0.0.11 valid=10s ipv6=off;

    # Allow unlimited client upload size
    client_max_body_size 0;

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css text/javascript application/javascript application/json;
    gzip_min_length 1000;

    # Root location - serve static files
    root /usr/share/nginx/html;

    # Fonts, icons, images: rarely change, safe to cache aggressively.
    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # CSS / JS — must revalidate so a redeploy is picked up immediately.
    # The index.html links these without a version query string, so without
    # this rule a stale stylesheet/script sits in the browser cache forever
    # (which produced the unstyled calendar that triggered this fix).
    location ~* \.(css|js)$ {
        expires -1;
        add_header Cache-Control "no-cache, must-revalidate";
    }

    # HTML files - no cache
    location ~* \.html?$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Live HLS — served from /live (bind-mounted shared volume), low cache so playlist refreshes
    location /live/ {
        alias /live/;
        types { application/vnd.apple.mpegurl m3u8; video/mp2t ts; }
        add_header Cache-Control "no-cache";
        add_header Access-Control-Allow-Origin *;
    }

    # API proxy - forward to mam-api service
    location /api/ {
        set $api_upstream http://mam-api:3000;
        client_max_body_size 0;
        proxy_pass $api_upstream;
        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;
        # Preserve Content-Type so multer receives the full multipart boundary (#74)
        proxy_set_header Content-Type $content_type;
        proxy_buffering off;
        proxy_request_buffering off;
        proxy_connect_timeout 300;
        proxy_send_timeout 300;
        proxy_read_timeout 300;
    }

    # Capture proxy - forward to capture service
    location /capture/ {
        set $capture_upstream http://capture:3001;
        proxy_pass $capture_upstream;
        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_buffering off;
        proxy_request_buffering off;
    }

    # Premiere panel downloads — served as binary attachments
    location /downloads/ {
        add_header Cache-Control "public, max-age=86400";
        add_header Content-Disposition 'attachment';
    }

    # SPA fallback - try to serve file, else route to the React shell.
    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Deny access to dotfiles
    location ~ /\. {
        deny all;
    }
}