# =============================================================================
# AWOOOI Nginx Reverse Proxy Configuration
# =============================================================================
# 域名: awoooi.wooo.work
# 用途: 新版前端 + API Gateway 反向代理
# 負責人: CIO (CIO-002)
# 日期: 2026-03-21
#
# 後端架構:
#   - 前端 (Next.js): K3s NodePort 192.168.0.120:32335
#   - API (FastAPI):  K3s NodePort 192.168.0.120:32334
#
# ⚠️ 警告: 絕對不允許出現 Legacy 系統的 Port (31234/31235)
# =============================================================================

# -----------------------------------------------------------------------------
# Upstream 定義 (K3s NodePort)
# -----------------------------------------------------------------------------
upstream awoooi_web {
    server 192.168.0.120:32335;
    keepalive 32;
}

upstream awoooi_api {
    server 192.168.0.120:32334;
    keepalive 64;
}

# -----------------------------------------------------------------------------
# HTTP → HTTPS 重導向
# -----------------------------------------------------------------------------
server {
    listen 80;
    listen [::]:80;
    server_name awoooi.wooo.work;

    # Let's Encrypt ACME Challenge
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    # 強制 HTTPS
    location / {
        return 301 https://$host$request_uri;
    }
}

# -----------------------------------------------------------------------------
# HTTPS 主配置
# -----------------------------------------------------------------------------
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name awoooi.wooo.work;

    # =========================================================================
    # SSL 配置 (Let's Encrypt)
    # =========================================================================
    ssl_certificate /etc/letsencrypt/live/awoooi.wooo.work/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/awoooi.wooo.work/privkey.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # Modern SSL 配置 (TLS 1.2+)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    # HSTS (2 年)
    add_header Strict-Transport-Security "max-age=63072000" always;

    # =========================================================================
    # 安全 Headers
    # =========================================================================
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # =========================================================================
    # 通用 Proxy 設定
    # =========================================================================
    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;
    proxy_set_header X-Forwarded-Host $host;
    proxy_set_header X-Forwarded-Port $server_port;

    # =========================================================================
    # API 路由 (/api/)
    # =========================================================================
    # 標準 REST API
    location /api/ {
        proxy_pass http://awoooi_api;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # Connection 重用
        proxy_set_header Connection "";
    }

    # -------------------------------------------------------------------------
    # SSE 端點專用配置 (Server-Sent Events)
    # -------------------------------------------------------------------------
    # /api/v1/dashboard/stream - 戰情室即時串流
    # /api/v1/agent/thinking - AI 思考過程串流
    location ~ ^/api/v1/(dashboard/stream|agent/thinking) {
        proxy_pass http://awoooi_api;

        # SSE 必要設定: 禁用緩衝
        proxy_buffering off;
        proxy_cache off;

        # SSE 長連線 (24 小時)
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;

        # 保持連線
        proxy_set_header Connection "";

        # 禁用 gzip (SSE 不需要壓縮)
        gzip off;

        # Chunked Transfer Encoding
        chunked_transfer_encoding on;
    }

    # -------------------------------------------------------------------------
    # WebSocket 端點 (預留)
    # -------------------------------------------------------------------------
    location /api/v1/ws {
        proxy_pass http://awoooi_api;

        # WebSocket 升級
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # WebSocket 長連線
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;
    }

    # =========================================================================
    # 前端路由 (/)
    # =========================================================================
    location / {
        proxy_pass http://awoooi_web;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # Connection 重用
        proxy_set_header Connection "";
    }

    # -------------------------------------------------------------------------
    # Next.js 靜態資源快取
    # -------------------------------------------------------------------------
    location /_next/static/ {
        proxy_pass http://awoooi_web;
        proxy_cache_valid 200 365d;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # =========================================================================
    # 健康檢查端點 (Nginx 層級)
    # =========================================================================
    location /nginx-health {
        access_log off;
        return 200 "OK";
        add_header Content-Type text/plain;
    }

    # =========================================================================
    # 錯誤頁面
    # =========================================================================
    error_page 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
        internal;
    }

    # =========================================================================
    # 日誌配置
    # =========================================================================
    access_log /var/log/nginx/awoooi.wooo.work.access.log;
    error_log /var/log/nginx/awoooi.wooo.work.error.log warn;
}