// 文件名: src/web/web_server.cc
#include "web_server.h"

#include <fstream>
#include <sstream>

#include "config/config_manager.h"
#include "spdlog/spdlog.h"

WebServer::WebServer(SystemMonitor::SystemMonitor &monitor,
                     DeviceManager &deviceManager, LiveDataCache &liveDataCache,
                     AlarmService &alarm_service, uint16_t port)
    : crow::Crow<crow::CORSHandler>(), m_monitor(monitor),
      m_device_manager(deviceManager), m_live_data_cache(liveDataCache),
      m_alarm_service(alarm_service), m_port(port) {
  auto &cors = this->get_middleware<crow::CORSHandler>();
  cors.global()
      .origin("*")
      .headers("Content-Type", "Authorization")
      .methods("GET"_method, "POST"_method, "OPTIONS"_method);

  this->loglevel(crow::LogLevel::Warning);
  setup_routes();
}

WebServer::~WebServer() { stop(); }

void WebServer::start() {
  if (m_thread.joinable()) {
    spdlog::warn("Web server is already running.");
    return;
  }
  m_thread = std::thread([this]() {
    spdlog::info("Starting Web server on port {}", m_port);
    this->bindaddr("0.0.0.0").port(m_port).run();
    spdlog::info("Web server has stopped.");
  });
}

void WebServer::stop() {
  crow::Crow<crow::CORSHandler>::stop();
  if (m_thread.joinable()) {
    m_thread.join();
  }
}

void WebServer::setup_routes() {
  CROW_ROUTE((*this), "/api/system/id").methods("GET"_method)([this] {
    auto deviceID = ConfigManager::getInstance().getDeviceID();
    crow::json::wvalue response;
    response["deviceID"] = deviceID;
    return response;
  });

  CROW_ROUTE((*this), "/api/system/status").methods("GET"_method)([this] {
    auto cpu_util = m_monitor.getCpuUtilization();
    auto mem_info = m_monitor.getMemoryInfo();

    crow::json::wvalue response;
    response["cpu_usage_percentage"] = cpu_util.totalUsagePercentage;
    response["memory_total_kb"] = mem_info.total_kb;
    response["memory_free_kb"] = mem_info.available_kb;
    response["memory_usage_percentage"] =
        (mem_info.total_kb > 0)
            ? (1.0 -
               static_cast<double>(mem_info.available_kb) / mem_info.total_kb) *
                  100.0
            : 0.0;

    return response;
  });

  CROW_ROUTE((*this), "/api/devices").methods("GET"_method)([this] {
    auto devices_info = m_device_manager.get_all_device_info();

    std::vector<crow::json::wvalue> devices_json;
    for (const auto &info : devices_info) {
      crow::json::wvalue device_obj;

      device_obj["id"] = info.id;
      device_obj["type"] = info.type;
      device_obj["is_running"] = info.is_running;

      crow::json::wvalue details_obj;
      for (const auto &pair : info.connection_details) {
        details_obj[pair.first] = pair.second;
      }
      device_obj["connection_details"] = std::move(details_obj);

      devices_json.push_back(std::move(device_obj));
    }
    auto res = crow::response(crow::json::wvalue(devices_json));
    res.set_header("Content-Type", "application/json");
    return res;
  });

  CROW_ROUTE((*this), "/api/data/latest").methods("GET"_method)([this] {
    auto latest_data_map = m_live_data_cache.get_all_data();

    crow::json::wvalue response;
    for (const auto &pair : latest_data_map) {
      response[pair.first] = crow::json::load(pair.second);
    }
    // 1. 将 JSON 对象转换为 crow::response
    auto res = crow::response(response);
    // 2. 明确设置 Content-Type 头部
    res.set_header("Content-Type", "application/json");
    // 3. 返回 response 对象
    return res;
  });

  CROW_ROUTE((*this), "/api/alarms/active").methods("GET"_method)([this] {
    try {
      auto json_string = m_alarm_service.getActiveAlarmsJson().dump();

      auto res = crow::response(200, json_string);
      res.set_header("Content-Type", "application/json");
      return res;

    } catch (const std::exception &e) {
      spdlog::error("Error processing /api/alarms/active: {}", e.what());
      crow::json::wvalue error_resp;
      error_resp["error"] = "Failed to retrieve active alarms.";

      auto res = crow::response(500, error_resp.dump());
      res.set_header("Content-Type", "application/json");
      return res;
    }
  });

  CROW_ROUTE((*this), "/api/alarms/history")
      .methods("GET"_method)([this](const crow::request &req) {
        int limit = 100;
        if (req.url_params.get("limit")) {
          try {
            limit = std::stoi(req.url_params.get("limit"));
          } catch (const std::exception &) { /* ignore invalid */
          }
        }
        if (limit <= 0)
          limit = 100;

        try {
          auto json_string = m_alarm_service.getAlarmHistoryJson(limit).dump();

          auto res = crow::response(200, json_string);
          res.set_header("Content-Type", "application/json");
          return res;

        } catch (const std::exception &e) {
          spdlog::error("Error processing /api/alarms/history: {}", e.what());
          crow::json::wvalue error_resp;
          error_resp["error"] = "Failed to retrieve alarm history.";

          auto res = crow::response(500, error_resp.dump());
          res.set_header("Content-Type", "application/json");
          return res;
        }
      });

  CROW_ROUTE((*this), "/api/alarms/reload").methods("POST"_method)([this]() {
    spdlog::info("Web API: Received request to reload alarm rules...");

    bool success = m_alarm_service.reload_rules();

    if (success) {
      crow::json::wvalue response_json;
      response_json["status"] = "success";
      response_json["message"] = "Alarm rules reloaded successfully.";

      auto res = crow::response(200, response_json.dump());
      res.set_header("Content-Type", "application/json");
      return res;

    } else {
      crow::json::wvalue error_json;
      error_json["status"] = "error";
      error_json["message"] =
          "Failed to reload alarm rules. Check service logs for details.";
      auto res = crow::response(500, error_json.dump());
      res.set_header("Content-Type", "application/json");
      return res;
    }
  });

  CROW_ROUTE((*this), "/api/alarms/clear")
      .methods("POST"_method)([this](const crow::request &req) {
        crow::json::rvalue j_body;
        try {
          j_body = crow::json::load(req.body);
        } catch (const std::exception &e) {
          spdlog::warn("Failed to parse request body for /api/alarms/clear: {}",
                       e.what());
          auto res = crow::response(400, "{\"error\":\"Invalid JSON body.\"}");
          res.set_header("Content-Type", "application/json");
          return res;
        }

        if (!j_body.has("rule_id") || !j_body.has("device_id")) {
          auto res = crow::response(
              400, "{\"error\":\"Missing 'rule_id' or 'device_id'.\"}");
          res.set_header("Content-Type", "application/json");
          return res;
        }

        std::string rule_id = j_body["rule_id"].s();
        std::string device_id = j_body["device_id"].s();

        bool success = m_alarm_service.manually_clear_alarm(rule_id, device_id);

        if (success) {
          auto res = crow::response(
              200, "{\"status\":\"success\", \"message\":\"Alarm cleared.\"}");
          res.set_header("Content-Type", "application/json");
          return res;
        } else {
          auto res = crow::response(
              404, "{\"status\":\"error\", \"message\":\"Alarm not "
                   "found or not active.\"}");
          res.set_header("Content-Type", "application/json");
          return res;
        }
      });

  CROW_ROUTE((*this), "/api/alarms/config").methods("GET"_method)([this]() {
    std::string rules_json_string = m_alarm_service.get_rules_as_json_string();
    auto res = crow::response(200, rules_json_string);
    res.set_header("Content-Type", "application/json");
    return res;
  });

  CROW_ROUTE((*this), "/api/alarms/config")
      .methods("POST"_method)([this](const crow::request &req) {
        const std::string &new_rules_content = req.body;

        bool success =
            m_alarm_service.save_rules_from_json_string(new_rules_content);

        if (success) {
          crow::json::wvalue response_json;
          response_json["status"] = "success";
          response_json["message"] =
              "Rules saved successfully. A reload is required to apply.";

          auto res = crow::response(200, response_json.dump());
          res.set_header("Content-Type", "application/json");
          return res;

        } else {
          crow::json::wvalue error_json;
          error_json["status"] = "error";
          error_json["message"] =
              "Failed to save rules. Invalid JSON format or server error.";

          auto res = crow::response(400, error_json.dump());
          res.set_header("Content-Type", "application/json");
          return res;
        }
      });

  // --- [!! 新增路由: 设备配置管理 !!] ---

  /**
   * @brief GET /api/devices/config
   * 获取设备配置 (devices.json) 的原始 JSON 字符串
   */
  CROW_ROUTE((*this), "/api/devices/config").methods("GET"_method)([this]() {
    std::string rules_json_string =
        m_device_manager.get_config_as_json_string();
    auto res = crow::response(200, rules_json_string);
    res.set_header("Content-Type", "application/json");
    return res;
  });

  /**
   * @brief POST /api/devices/config
   * 保存设备配置 (devices.json) 的原始 JSON 字符串
   */
  CROW_ROUTE((*this), "/api/devices/config")
      .methods("POST"_method)([this](const crow::request &req) {
        const std::string &new_rules_content = req.body;

        // save_config_from_json_string 内部包含 JSON 格式和 Schema 校验
        bool success =
            m_device_manager.save_config_from_json_string(new_rules_content);

        if (success) {
          crow::json::wvalue response_json;
          response_json["status"] = "success";
          response_json["message"] = "Device config saved successfully. A "
                                     "reload is required to apply.";

          auto res = crow::response(200, response_json.dump());
          res.set_header("Content-Type", "application/json");
          return res;

        } else {
          crow::json::wvalue error_json;
          error_json["status"] = "error";
          error_json["message"] = "Failed to save rules. Invalid JSON format "
                                  "or schema. Check service logs.";

          auto res = crow::response(400, error_json.dump());
          res.set_header("Content-Type", "application/json");
          return res;
        }
      });

  /**
   * @brief POST /api/devices/reload
   * 通知后端从磁盘重载 devices.json 并应用
   */
  CROW_ROUTE((*this), "/api/devices/reload").methods("POST"_method)([this]() {
    spdlog::info("Web API: Received request to reload device rules...");

    bool success = m_device_manager.reload_config_from_file();

    if (success) {
      crow::json::wvalue response_json;
      response_json["status"] = "success";
      response_json["message"] = "Device rules reload posted successfully.";

      auto res = crow::response(200, response_json.dump());
      res.set_header("Content-Type", "application/json");
      return res;

    } else {
      crow::json::wvalue error_json;
      error_json["status"] = "error";
      error_json["message"] =
          "Failed to post device rules reload. Check service logs.";
      auto res = crow::response(500, error_json.dump());
      res.set_header("Content-Type", "application/json");
      return res;
    }
  });
}