server {
    listen 80;
    listen [::]:80;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # Security headers
    
    # Content Security Policy (CSP) - Protection contre XSS
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https:; connect-src 'self' https://www.google-analytics.com https://www.googletagmanager.com; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; require-trusted-types-for 'script';" always;
    
    # HTTP Strict Transport Security (HSTS) - Force HTTPS
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    
    # Cross-Origin-Opener-Policy (COOP) - Isolation de l'origine
    add_header Cross-Origin-Opener-Policy "same-origin" always;
    
    # Cross-Origin-Resource-Policy (CORP)
    add_header Cross-Origin-Resource-Policy "same-origin" always;
    
    # Cross-Origin-Embedder-Policy (COEP)
    add_header Cross-Origin-Embedder-Policy "require-corp" always;
    
    # Protection contre le clickjacking
    add_header X-Frame-Options "DENY" always;
    
    # Protection contre le MIME type sniffing
    add_header X-Content-Type-Options "nosniff" always;
    
    # Protection XSS (legacy)
    add_header X-XSS-Protection "1; mode=block" always;
    
    # Referrer Policy - Contrôle des informations envoyées
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    
    # Permissions Policy - Contrôle des fonctionnalités du navigateur
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=(), magnetometer=(), gyroscope=(), accelerometer=()" always;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 256;
    gzip_types 
        text/plain 
        text/css 
        text/xml 
        text/javascript 
        application/json 
        application/javascript 
        application/xml+rss 
        application/rss+xml 
        font/truetype 
        font/opentype 
        application/vnd.ms-fontobject 
        image/svg+xml
        application/wasm;

    # Brotli compression (si supporté par nginx)
    # brotli on;
    # brotli_comp_level 6;
    # brotli_types text/plain text/css application/json application/javascript text/xml application/xml image/svg+xml;

    # Cache static assets - Images WebP
    location ~* \.(webp)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Vary "Accept-Encoding";
    }

    # Cache static assets - Images
    location ~* \.(jpg|jpeg|png|gif|ico|svg)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Vary "Accept-Encoding";
    }

    # Cache static assets - CSS/JS avec hash (versionnés)
    location ~* \.(css|js)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Vary "Accept-Encoding";
    }

    # Cache static assets - Fonts
    location ~* \.(woff|woff2|ttf|otf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Access-Control-Allow-Origin "*";
    }

    # SPA fallback - toutes les routes vers index.html
    location / {
        try_files $uri $uri/ /index.html;
        
        # HTTP/2 Server Push pour les ressources critiques (si supporté)
        # http2_push /assets/css/index.css;
        # http2_push /assets/js/index.js;
    }

    # Disable cache for index.html
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header Pragma "no-cache" always;
        add_header Expires "0" always;
        
        # Ajout de Link headers pour preconnect
        add_header Link "<https://fonts.googleapis.com>; rel=preconnect" always;
        add_header Link "<https://fonts.gstatic.com>; rel=preconnect; crossorigin" always;
    }

    # Disable cache for service worker if you add one later
    location = /service-worker.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }

    # Error pages
    error_page 404 /index.html;
    
    # Optimisation supplémentaire
    tcp_nopush on;
    tcp_nodelay on;
    sendfile on;
    keepalive_timeout 65;
}