# GOD CRM Production Nginx Configuration
# ADR-064 Phase 3, Task 11
#
# Install: ln -sf /root/workspace/business-crm/deploy/nginx/godcrm.conf /etc/nginx/sites-enabled/godcrm.conf
# Test:    nginx -t
# Reload:  systemctl reload nginx

# Rate limiting zones (in http context)
limit_req_zone $binary_remote_addr zone=api:10m rate=100r/m;
limit_req_zone $binary_remote_addr zone=auth:10m rate=10r/m;

# HTTPS server
server {
    listen 443 ssl http2;
    server_name crm.hltrn.cc;

    # TLS
    ssl_certificate /etc/letsencrypt/live/crm.hltrn.cc/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/crm.hltrn.cc/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Security headers (supplement Helmet)
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' wss: https:;" always;

    # Logging
    access_log /var/log/nginx/crm.hltrn.cc.access.log;
    error_log /var/log/nginx/crm.hltrn.cc.error.log;

    # Rate limiting for auth endpoints (stricter: 10 req/min)
    location /api/v3/auth/ {
        limit_req zone=auth burst=5 nodelay;
        proxy_pass http://127.0.0.1:5000;
        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;
    }

    # Health check (no rate limit — used by monitoring)
    location /api/health {
        proxy_pass http://127.0.0.1:5000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # FIX #45201: Google OAuth SPA route - exact match for frontend callback page
    location = /auth/google/complete {
        try_files $uri /index.html;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Google OAuth - proxy all /auth/google/* to backend (callback, connect, etc.)
    location ^~ /auth/google/ {
        proxy_pass http://127.0.0.1:5000;
        proxy_http_version 1.1;
        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;
    }

    # API proxy with rate limiting (100 req/min)
    location /api/ {
        limit_req zone=api burst=200 nodelay;
        proxy_pass http://127.0.0.1:5000;
        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_read_timeout 1800s;   # 30 min — match Claude CLI timeout (BUG-504 hotfix)
        proxy_send_timeout 1800s;   # 30 min — match Claude CLI timeout (BUG-504 hotfix)
        proxy_connect_timeout 30s;  # Connection establishment only
        client_max_body_size 50m;
    }

    # WebSocket support for chat
    location /ws/ {
        proxy_pass http://127.0.0.1:5000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_read_timeout 86400;
    }

    # Uploaded files — served by nginx directly
    location /uploads/ {
        alias /var/lib/business-crm-data/uploads/;
        expires 7d;
        add_header Cache-Control "public";

        # Security: block script execution
        location ~* \.(php|pl|py|sh|cgi)$ {
            deny all;
        }
    }

    # Static assets with long cache (fingerprinted by Vite)
    location /assets/ {
        root /var/www/business-crm/dist;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # Static frontend — SPA fallback
    location / {
        root /var/www/business-crm/dist;
        try_files $uri $uri/ /index.html;
        expires 1d;
        add_header Cache-Control "public, no-transform";
    }
}

# HTTP redirect to HTTPS
server {
    listen 80;
    server_name crm.hltrn.cc;
    return 301 https://$server_name$request_uri;
}