# AWOOOI 正式環境 Nginx 路由配置
# 負責人: CIO
# 版本: v1.0
# 日期: 2026-03-20
#
# 部署位置: 192.168.0.188 (Host 直裝)
# 檔案路徑: /etc/nginx/conf.d/awoooi-prod.conf
#
# ⚠️ 域名待確認: awoooi.wooo.work (CEO) vs app.awoooi.wooo.work (Gemini)

# 後端 API 上游 (K3s NodePort)
upstream awoooi_prod_api {
    server 192.168.0.120:32334;
    server 192.168.0.121:32334;
    keepalive 32;
}

# 前端上游 (K3s NodePort)
upstream awoooi_prod_web {
    server 192.168.0.120:32335;
    server 192.168.0.121:32335;
    keepalive 16;
}

server {
    listen 443 ssl http2;
    # ⚠️ 域名待最終確認
    server_name awoooi.wooo.work;

    # SSL 憑證
    ssl_certificate /etc/nginx/ssl/awoooi.crt;
    ssl_certificate_key /etc/nginx/ssl/awoooi.key;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;

    # 系統標識 Header
    proxy_set_header X-System "awoooi-prod";

    # 共用 Proxy Headers
    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;

    # L0 public maintenance fallback：攔截 upstream 502/503/504，
    # 避免主機或 K3s rollout 期間把 Nginx raw 5xx 直接給使用者。
    proxy_intercept_errors on;

    # ============================================
    # SSE 串流路由 (AI 思考 / Dashboard 即時更新)
    # ⚠️ 關鍵配置: 禁用緩衝 + 長連線
    # ============================================
    location ~ ^/api/v1/(agent|dashboard)/stream {
        proxy_pass http://awoooi_prod_api;
        proxy_intercept_errors on;
        error_page 502 503 504 =503 /__awoooi-maintenance.html;

        # 禁用緩衝 (AI 打字機效果零延遲)
        proxy_buffering off;
        proxy_cache off;

        # 長連線支援 (1 小時)
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
        proxy_connect_timeout 60s;

        # HTTP/1.1 長連線
        proxy_http_version 1.1;
        proxy_set_header Connection '';
        proxy_set_header X-Accel-Buffering no;

        # 分塊傳輸編碼
        chunked_transfer_encoding on;
    }

    # ============================================
    # Next.js API Routes (前端處理)
    # ⚠️ 必須在 /api/ 之前，否則會被後端攔截
    # ============================================
    location /api/sentry-tunnel {
        proxy_pass http://awoooi_prod_web;
        proxy_intercept_errors on;
        error_page 502 503 504 =503 /__awoooi-maintenance.html;

        proxy_http_version 1.1;
        proxy_set_header Connection "keep-alive";
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    # ============================================
    # 一般 API 路由 (FastAPI 後端)
    # ============================================
    location /api/ {
        proxy_pass http://awoooi_prod_api;
        proxy_intercept_errors on;
        error_page 502 503 504 =503 /__awoooi-maintenance.html;

        proxy_http_version 1.1;
        proxy_set_header Connection "keep-alive";

        proxy_read_timeout 60s;
        proxy_send_timeout 60s;
    }

    # ============================================
    # 健康檢查 (不經認證)
    # ============================================
    location /api/health {
        proxy_pass http://awoooi_prod_api/health;
        proxy_intercept_errors on;
        error_page 502 503 504 =503 /__awoooi-maintenance.html;
        proxy_read_timeout 5s;

        # 允許監控系統存取
        allow 192.168.0.0/24;
        deny all;
    }

    # ============================================
    # 前端靜態資源
    # ============================================
    location / {
        proxy_pass http://awoooi_prod_web;
        proxy_intercept_errors on;
        error_page 502 503 504 =503 /__awoooi-maintenance.html;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # 靜態資源快取
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
            proxy_pass http://awoooi_prod_web;
            proxy_intercept_errors on;
            error_page 502 503 504 =503 /__awoooi-maintenance.html;
            expires 7d;
            add_header Cache-Control "public, immutable";
        }
    }

    # ============================================
    # Public maintenance fallback
    # ============================================
    error_page 502 503 504 =503 /__awoooi-maintenance.html;
    location = /__awoooi-maintenance.html {
        internal;
        root /var/www/maintenance;
        try_files /maintenance.html =503;
        add_header Cache-Control "no-store, no-cache, must-revalidate, max-age=0" always;
        add_header Retry-After "120" always;
        add_header X-AWOOOI-Fallback "local-maintenance" always;
    }

    # ============================================
    # 日誌配置
    # ============================================
    access_log /var/log/nginx/awoooi-prod-access.log;
    error_log /var/log/nginx/awoooi-prod-error.log;
}

# HTTP 重導向至 HTTPS
server {
    listen 80;
    server_name awoooi.wooo.work;
    return 301 https://$server_name$request_uri;
}