upstream mattermost_backend {
    server 127.0.0.1:8065;
    keepalive 32;
}

proxy_cache_path /var/cache/nginx/mattermost levels=1:2 keys_zone=mattermost_cache:10m max_size=3g inactive=120m use_temp_path=off;

server {
    listen 80;
    listen [::]:80;
    server_name mm.crista.love;

    # Redirect all HTTP to HTTPS
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name mm.crista.love;

    # SSL Configuration - Cloudflare Origin Certificate
    ssl_certificate /etc/nginx/ssl/mm-crista-love.crt;
    ssl_certificate_key /etc/nginx/ssl/mm-crista-love.key;

    # Modern SSL configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # Security Headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Logging
    access_log /var/log/nginx/mattermost-access.log;
    error_log /var/log/nginx/mattermost-error.log;

    # Disable server tokens
    server_tokens off;

    # Max upload size (for file attachments)
    client_max_body_size 100M;

    location ~ /api/v[0-9]+/(users/)?websocket$ {
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_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-Frame-Options SAMEORIGIN;
        proxy_buffers 256 16k;
        proxy_buffer_size 16k;
        client_body_timeout 60;
        send_timeout 300;
        lingering_timeout 5;
        proxy_connect_timeout 90;
        proxy_send_timeout 300;
        proxy_read_timeout 90s;
        proxy_http_version 1.1;
        proxy_pass http://mattermost_backend;
    }

    location / {
        proxy_set_header Host $http_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-Frame-Options SAMEORIGIN;
        proxy_buffers 256 16k;
        proxy_buffer_size 16k;
        proxy_read_timeout 600s;
        proxy_http_version 1.1;
        proxy_pass http://mattermost_backend;

        # Static asset caching
        location ~ ^/static/ {
            proxy_pass http://mattermost_backend;
            proxy_cache mattermost_cache;
            proxy_cache_valid 200 1d;
            proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
            proxy_cache_revalidate on;
            proxy_cache_background_update on;
            add_header X-Cache-Status $upstream_cache_status;
        }
    }

    # Health check endpoint
    location = /health {
        proxy_pass http://mattermost_backend;
        proxy_http_version 1.1;
        proxy_set_header Host $http_host;
    }
}