{
  // =============================================================================
  // appsettings.spider.json - Example configuration for NScrapy Spider
  // =============================================================================
  // This file configures the Spider (NScrapy.Shell / NScrapy.Project) when running
  // inside a Docker container. It is loaded from appsettings.json at runtime.
  //
  // ENVIRONMENT VARIABLE OVERRIDES
  // ------------------------------
  // All settings in this file can be overridden by environment variables at
  // container startup. This is the recommended approach for Docker Compose.
  //
  // Mapping rule: JSON key path → environment variable name
  //   Section key   → "Section__SubKey__SubSubKey" (double-underscore separator)
  //
  // Examples:
  //   AppSettings:Scheduler:SchedulerType  →  Scheduler__SchedulerType
  //   AppSettings:Scheduler:RedisHost       →  Scheduler__RedisHost
  //   AppSettings:SpiderEngine:SpiderEngineName → SpiderEngine__SpiderEngineName
  //
  // Docker Compose example:
  //   environment:
  //     - REDIS_ENABLED=true
  //     - REDIS_HOST=redis
  //     - REDIS_PORT=6379
  //     - Scheduler__SchedulerType=NScrapy.Scheduler.RedisExt.RedisScheduler
  // =============================================================================

  "AppSettings": {

    // ---- Config Provider ----
    // "ConfigProvider" values: "Zookeeper", "JsonFile" (default)
    // When using Zookeeper, also set ZookeeperEndpoint below.
    "ConfigProvider": "JsonFile",
    "ZookeeperEndpoint": "",

    // ---- Spider Engine ----
    // Leave empty to use the default NScrapyEngine.
    // Override via: SpiderEngine__SpiderEngineName
    "SpiderEngine": {
      "SpiderEngineName": "",
      "SpiderEngineAssembly": ""
    },

    // ---- Scheduler Configuration ----
    // SchedulerType options:
    //   - "NScrapy.Scheduler.InMemoryScheduler"        (local mode, no Redis)
    //   - "NScrapy.Scheduler.RedisExt.RedisScheduler"  (distributed mode, needs Redis)
    //
    // Override via: Scheduler__SchedulerType
    "Scheduler": {
      "SchedulerType": "NScrapy.Scheduler.InMemoryScheduler"
    },

    // ---- Redis Scheduler Extension ----
    // Only used when SchedulerType = RedisScheduler
    // Override via: Scheduler__RedisExt__RedisServer, Scheduler__RedisExt__RedisPort, etc.
    "Scheduler.RedisExt": {
      "RedisServer": "redis",
      "RedisPort": "6379",
      "ReceiverQueue": "NScrapy.Downloader",
      "ResponseQueue": "NScrapy.ResponseQueue"
    },

    // ---- Downloader Pool ----
    // Maximum number of concurrent downloader workers across all nodes.
    "DownloaderPoolCapbility": 4,

    // ---- Downloader Middlewares ----
    "DownloaderMiddlewares": [
      { "Middleware": "NScrapy.DownloaderShell.StatusUpdaterMiddleware" }
    ],

    // ---- HTTP Header Defaults ----
    "HttpHeader": {
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
      "Accept-Encoding": "gzip,deflate,br",
      "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
    },

    // ---- User-Agent Pool (rotated per request) ----
    "UserAgentPool": [
      { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" },
      { "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15" },
      { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0" },
      { "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" }
    ]
  }
}