worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

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

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent"';

    access_log /var/log/nginx/access.log main;

    sendfile on;
    tcp_nopush on;
    keepalive_timeout 65;
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;

    # WebDAV cache zone definition
    proxy_cache_path /meta-core/cache
        levels=1:2                    # 2-level directory structure
        keys_zone=webdav_cache:10m    # 10MB shared memory for keys
        max_size=10g                  # Max 10GB on disk
        inactive=1h                   # Remove if not accessed for 1 hour
        use_temp_path=off;            # Write directly to cache dir

    # Upstream: meta-core Go API
    upstream meta-core-api {
        server 127.0.0.1:9000;
    }

    # Upstream: rclone RC API
    upstream rclone {
        server 127.0.0.1:5572;
    }

    server {
        listen 80;
        server_name _;

        # =========================================================================
        # Dashboard (React SPA)
        # =========================================================================
        root /app/dashboard/dist;
        index index.html;

        location / {
            try_files $uri $uri/ /index.html;
        }

        # =========================================================================
        # Go API routes
        # All /api/* routes are proxied to meta-core Go server
        # =========================================================================
        location /api/ {
            proxy_pass http://meta-core-api/api/;
            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;

            # SSE support for /api/events/subscribe
            proxy_buffering off;
            proxy_cache off;
            proxy_read_timeout 86400s;

            # Snapshot import accepts multi-MB ZIP uploads.
            client_max_body_size 0;
        }

        # =========================================================================
        # Health check (direct to Go API)
        # =========================================================================
        location /health {
            proxy_pass http://meta-core-api/health;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        # =========================================================================
        # Metadata API (for services to access metadata)
        # =========================================================================
        location /meta/ {
            proxy_pass http://meta-core-api/meta/;
            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;
        }

        location /meta {
            proxy_pass http://meta-core-api/meta;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        # =========================================================================
        # File/Data API endpoints
        # =========================================================================
        location /file/ {
            proxy_pass http://meta-core-api/file/;
            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;
        }

        location /data/ {
            proxy_pass http://meta-core-api/data/;
            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;
        }

        # =========================================================================
        # Service discovery
        # =========================================================================
        location /services {
            proxy_pass http://meta-core-api/services;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        location /services/ {
            proxy_pass http://meta-core-api/services/;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        # meta-discovery v1 neighbours (supersedes /services, which stays
        # while consumers migrate).
        location /neighbors {
            proxy_pass http://meta-core-api/neighbors;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        # =========================================================================
        # Leader/role endpoints
        # =========================================================================
        location /leader {
            proxy_pass http://meta-core-api/leader;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        location /role {
            proxy_pass http://meta-core-api/role;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        location /urls {
            proxy_pass http://meta-core-api/urls;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        location /status {
            proxy_pass http://meta-core-api/status;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }

        # =========================================================================
        # rclone Web UI (proxied with basic auth)
        # =========================================================================
        location /rclone/ {
            proxy_pass http://rclone/;
            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 Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Basic auth for rclone
            auth_basic "rclone";
            auth_basic_user_file /etc/nginx/.htpasswd;
        }

        # =========================================================================
        # Metadata Editor (standalone React app)
        # Serves static files for the metadata editor
        # API routes (/api/metadata/*, /api/kv/*) are handled by the Go API
        # via the /api/ proxy above
        # =========================================================================
        location /editor/ {
            alias /app/editor/dist/;
            index index.html;
            try_files $uri $uri/ /editor/index.html;
        }

        # =========================================================================
        # WebDAV HTML browser (for iframe embedding in dashboard)
        # Returns HTML directory listings instead of JSON
        # =========================================================================

        # At the browser root, strip the "../" parent-dir row that autoindex
        # otherwise emits — clicking it inside the dashboard iframe would
        # navigate to "/" (the dashboard itself), nesting the page inside itself.
        location = /webdav-browser/ {
            alias /files/;
            autoindex on;
            charset utf-8;
            sub_filter '<a href="../">../</a>' '';
            sub_filter_once on;
        }

        location /webdav-browser/ {
            alias /files/;
            autoindex on;
            # No autoindex_format = defaults to HTML
            charset utf-8;
        }

        # =========================================================================
        # WebDAV endpoint for file access (nginx proxy_cache for GET/HEAD)
        # Supports: GET (read), PUT (write), DELETE, MKCOL (mkdir), PROPFIND
        # Files are cached by nginx for faster repeated access
        # =========================================================================
        location /webdav/ {
            # Slice module for large file chunked caching
            slice 1m;
            proxy_cache_key $uri$slice_range;
            proxy_set_header Range $slice_range;

            # Enable caching for GET/HEAD requests
            proxy_cache webdav_cache;
            proxy_cache_valid 200 206 1h;
            proxy_cache_methods GET HEAD;

            # Don't cache write operations
            set $no_cache 0;
            if ($request_method !~ ^(GET|HEAD)$) {
                set $no_cache 1;
            }
            proxy_no_cache $no_cache;
            proxy_cache_bypass $no_cache;

            # Cache status header for debugging
            add_header X-Cache-Status $upstream_cache_status always;

            # Proxy settings
            proxy_pass http://meta-core-api/webdav/;
            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;

            # Enable buffering for caching (required for proxy_cache)
            proxy_buffering on;
            proxy_request_buffering off;  # Don't buffer uploads

            # Large file support
            client_max_body_size 0;
            proxy_read_timeout 600s;
            proxy_send_timeout 600s;

            # CORS headers for cross-container access
            add_header 'Access-Control-Allow-Origin' '*' always;
            add_header 'Access-Control-Allow-Methods' 'GET, HEAD, PUT, DELETE, MKCOL, COPY, MOVE, PROPFIND, OPTIONS' always;
            add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type, Depth, Destination, Range, If-Range' always;
            add_header 'Access-Control-Expose-Headers' 'Content-Length, Content-Range, Accept-Ranges, X-Cache-Status' always;

            # Handle OPTIONS preflight
            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Methods' 'GET, HEAD, PUT, DELETE, MKCOL, COPY, MOVE, PROPFIND, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type, Depth, Destination, Range, If-Range';
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Content-Type' 'text/plain; charset=utf-8';
                add_header 'Content-Length' 0;
                return 204;
            }
        }

        location /webdav {
            proxy_pass http://meta-core-api/webdav;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
        }
    }
}