# ============================================================
# Spanglish Community - Backend API
# api.spanglishcommunity.com
# ============================================================

server {
    listen 80;
    server_name api.spanglishcommunity.com;

    # ACME
    location /.well-known/acme-challenge/ {
        root /var/www/html;
    }

    # Force HTTPS
    location / {
        return 301 https://api.spanglishcommunity.com$request_uri;
    }
}

server {
    listen 443 ssl;
    http2 on;

    server_name api.spanglishcommunity.com;

    # Upload size limit (avoid nginx 413 on media uploads)
    # Keep this >= backend MEDIA_MAX_UPLOAD_MB (default 10MB).
    client_max_body_size 20m;

    # SSL
    ssl_certificate /etc/letsencrypt/live/spanglishcommunity.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/spanglishcommunity.com/privkey.pem;

    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    # Security (API)
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;

    # Logs
    access_log /var/log/nginx/spanglish_api_access.log;
    error_log  /var/log/nginx/spanglish_api_error.log;

    # CORS Configuration (set once, used everywhere)
    set $cors_origin "";
    if ($http_origin ~* "^https://(www\.)?spanglishcommunity\.com$") {
        set $cors_origin $http_origin;
    }

    # Add CORS headers to all responses (including nginx-generated errors)
    add_header 'Access-Control-Allow-Origin' $cors_origin always;
    add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, PATCH, OPTIONS' always;
    add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
    add_header 'Access-Control-Allow-Credentials' 'true' always;
    add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;

    # Ensure 413 returns JSON + CORS (browser otherwise reports "CORS blocked")
    error_page 413 = @payload_too_large;
    location @payload_too_large {
        default_type application/json;
        return 413 '{"error":"Payload too large (413). Please upload a smaller file."}';
    }

    location / {
        limit_req zone=spanglish_api_limit burst=50 nodelay;

        # Handle preflight OPTIONS requests
        # NOTE: add_header inside if{} does NOT inherit server-level headers,
        # so we must repeat all CORS headers here.
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' $cors_origin always;
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, PATCH, OPTIONS' always;
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
            add_header 'Access-Control-Allow-Credentials' 'true' always;
            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
            add_header 'Access-Control-Max-Age' 86400 always;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }

        proxy_pass http://spanglish_backend;
        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;

        # Strip CORS headers from backend (nginx handles CORS at server level)
        proxy_hide_header 'Access-Control-Allow-Origin';
        proxy_hide_header 'Access-Control-Allow-Methods';
        proxy_hide_header 'Access-Control-Allow-Headers';
        proxy_hide_header 'Access-Control-Allow-Credentials';
        proxy_hide_header 'Access-Control-Expose-Headers';

        proxy_read_timeout 300s;
        proxy_connect_timeout 300s;
    }
}