# SciLit 生产环境 Nginx 配置
# HTTPS 应由上游反向代理（Caddy / Nginx / LB）终止，本配置仅处理 HTTP。
# 上游代理需设置 X-Forwarded-Proto 和 X-Forwarded-For 以便后端正确处理。

# ── Docker DNS 解析（backend 容器重建后自动刷新）──────────────
# proxy_pass 必须用变量形式触发动态解析，固定字符串会在启动时缓存
resolver 127.0.0.11 ipv6=off valid=30s;

# ── Gzip ──────────────────────────────────────────────────────────
gzip on;
gzip_vary on;
gzip_proxied any;
gzip_comp_level 5;
gzip_min_length 256;
gzip_types
    text/plain
    text/css
    text/javascript
    application/javascript
    application/json
    application/xml
    image/svg+xml
    font/woff2;

# ── 文件上传大小 ──────────────────────────────────────────────────
client_max_body_size 20m;

# ── 日志格式 ──────────────────────────────────────────────────────
log_format json escape=json '{'
    '"time":"$time_iso8601",'
    '"remote":"$remote_addr",'
    '"host":"$host",'
    '"method":"$request_method",'
    '"path":"$uri",'
    '"status":$status,'
    '"size":$body_bytes_sent,'
    '"referer":"$http_referer",'
    '"ua":"$http_user_agent",'
    '"upstream":"$upstream_addr",'
    '"request_time":"$request_time"'
'}';

access_log /var/log/nginx/access.log json;
error_log /var/log/nginx/error.log warn;

server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # ── 安全响应头 ────────────────────────────────────────────────
    add_header X-Content-Type-Options nosniff;
    add_header X-Frame-Options DENY;
    add_header X-XSS-Protection "0";
    add_header Referrer-Policy strict-origin-when-cross-origin;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https:; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; object-src 'none'" always;

    # ── SPA 入口（无 hash 的路径）─────────────────────────────────
    location / {
        try_files $uri $uri/ /index.html;
        # index.html 不缓存
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # ── 含 hash 的静态资源（vite 输出格式 *.xxx.hash.js/css） ────
    location ~* \.(js|css|svg|woff2?)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
        # 不匹配 hash 的后备
        try_files $uri /index.html;
    }

    # ── 图片 / 字体 ──────────────────────────────────────────────
    location ~* \.(png|jpg|jpeg|gif|ico|webp|woff2?|ttf|eot)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # ── API 代理（用变量触发动态 DNS 解析）─────────────────────────
    set $backend_upstream http://backend:8000;
    location /api/ {
        proxy_pass $backend_upstream;
        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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 60s;
        proxy_send_timeout 60s;
    }

    # ── WS 升级（长连接，超时更长）───────────────────────────────
    location /api/v1/ws/ {
        proxy_pass $backend_upstream;
        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_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 3600s;
        proxy_send_timeout 60s;
    }

    # ── /health 不记日志 ────────────────────────────────────────
    location /health {
        proxy_pass $backend_upstream;
        access_log off;
        proxy_http_version 1.1;
    }
}