worker_processes auto;

events {
    worker_connections 1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    # 对齐 application.yml 的 spring.servlet.multipart.max-request-size（25M）
    client_max_body_size 25M;

    sendfile on;
    keepalive_timeout 65;
    gzip on;
    # text/javascript 与 application/javascript 均列，兼容不同版本 mime.types 对 .js 的映射
    gzip_types text/css text/javascript application/javascript application/json image/svg+xml;

    upstream crm_app {
        server crm-app:8080;
    }

    # 缩略图代理缓存区（10MB 内存索引，100MB 磁盘，1天不访问则淘汰）
    proxy_cache_path /var/cache/nginx/thumbnails
        levels=1:2
        keys_zone=thumb_cache:10m
        max_size=100m
        inactive=1d
        use_temp_path=off;

    server {
        listen 80;
        server_name _;

        # ========== 静态文档页（浏览器缓存 1 天） ==========
        location /crm-api/docs/ {
            alias /usr/share/nginx/docs/;
            index crm-api-docs-documentation.html;
            expires 1d;
            add_header Cache-Control "public, max-age=86400";
        }
        location = /crm-api/docs {
            return 301 /crm-api/docs/;
        }
        location /docs/ {
            alias /usr/share/nginx/docs/;
            index crm-api-docs-documentation.html;
            expires 1d;
            add_header Cache-Control "public, max-age=86400";
        }
        location = /docs {
            return 301 /docs/;
        }

        # ========== 缩略图（nginx 代理缓存） ==========
        # 后端对 READY 缩略图返回 Cache-Control: max-age=86400 → nginx 缓存
        # 后端对占位图返回 Cache-Control: no-cache → nginx 不缓存（尊重后端）
        # 带 /crm-api 前缀
        location /crm-api/api/file/thumbnail {
            proxy_pass http://crm_app/api/file/thumbnail;
            proxy_cache thumb_cache;
            proxy_cache_key "$scheme$request_method$host$request_uri";
            proxy_cache_valid 200 1d;
            proxy_cache_valid 404 1m;
            proxy_cache_use_stale error timeout updating;
            add_header X-Cache-Status $upstream_cache_status;
            proxy_set_header Host $host;
        }
        # 不带前缀
        location /api/file/thumbnail {
            proxy_pass http://crm_app;
            proxy_cache thumb_cache;
            proxy_cache_key "$scheme$request_method$host$request_uri";
            proxy_cache_valid 200 1d;
            proxy_cache_valid 404 1m;
            proxy_cache_use_stale error timeout updating;
            add_header X-Cache-Status $upstream_cache_status;
            proxy_set_header Host $host;
        }

        # ========== 带 /crm-api 前缀的 API（去掉前缀转发） ==========
        location /crm-api/ {
            proxy_pass http://crm_app/;
            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         300s;
            proxy_send_timeout         300s;
            proxy_request_buffering    off;
        }

        # ========== 不带前缀的 API 直接转发 ==========
        # 前端部署后 location / 让给静态资源，API 透传职责由本块承接（原样传递，不重写 URI）
        location /api/ {
            proxy_pass http://crm_app;
            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         300s;
            proxy_send_timeout         300s;
            proxy_request_buffering    off;
        }

        # ========== 前端静态资源（SPA） ==========
        # 宿主机 nginx/html 挂载到 /usr/share/nginx/html（见 docker-compose.yml）
        # 前端更新：替换宿主机 nginx/html 目录内容即可，无需重启容器
        location / {
            root /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }

        # index.html 不缓存：发版后浏览器立刻拿到新版（引用新 hash 的 js/css）
        location = /index.html {
            root /usr/share/nginx/html;
            add_header Cache-Control "no-cache";
        }

        # 带 hash 的构建产物长缓存
        location /assets/ {
            root /usr/share/nginx/html;
            expires 30d;
            add_header Cache-Control "public, immutable";
        }
    }
}