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

    # --- OWASP Security Headers ---

    # Prevent MIME type sniffing
    add_header X-Content-Type-Options "nosniff" always;

    # Clickjacking protection
    add_header X-Frame-Options "DENY" always;

    # XSS protection (legacy browsers)
    add_header X-XSS-Protection "1; mode=block" always;

    # Referrer policy
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Permissions policy - restrict browser features
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), payment=(), usb=(), magnetometer=(), gyroscope=(), accelerometer=()" always;

    # Content Security Policy - strict, no inline scripts
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.gstatic.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data:; connect-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self' mailto:;" always;

    # HSTS - force HTTPS (handled by Traefik, but reinforced here)
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

    # Prevent content from being cached when it contains sensitive data
    add_header X-Permitted-Cross-Domain-Policies "none" always;

    # --- Performance ---

    # 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/javascript
        application/javascript
        application/json
        application/xml
        image/svg+xml
        application/xhtml+xml;

    # Static assets caching
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header X-Content-Type-Options "nosniff" always;
        access_log off;
    }

    # HTML - no cache (allow revalidation)
    location ~* \.html$ {
        add_header Cache-Control "no-cache, must-revalidate";
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-Frame-Options "DENY" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.gstatic.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data:; connect-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self' mailto:;" always;
        add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
        add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), payment=(), usb=(), magnetometer=(), gyroscope=(), accelerometer=()" always;
    }

    # SPA-style routing - serve index.html for all routes
    location / {
        try_files $uri $uri/ $uri.html /index.html;
    }

    # Block dotfiles (security)
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Block access to sensitive files
    location ~* \.(env|git|gitignore|dockerignore|md|yml|yaml|toml|lock|log)$ {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Custom error pages
    error_page 404 /404.html;
    error_page 500 502 503 504 /index.html;

    # Disable server tokens
    server_tokens off;
}