import {
  loadGeoJSONFromPath,
  loadLandingPoints,
  getCableLegendItems,
  toggleCables,
} from "./cables.js";
import {
  clearSatelliteData,
  getSatelliteLegendItems,
  loadSatellites,
  toggleSatellites,
} from "./satellites.js";
import {
  loadBGPAnomalies,
  toggleBGP,
} from "./bgp.js";

/**
 * Layer startup task registry.
 *
 * This module is the startup-task counterpart to the layer registry in controls.js:
 * - controls.js owns layer metadata such as startupPriority/startupMode/startupMessage
 * - this file owns the executable startup task factory for each layer id
 *
 * A startup task is registered via registerLayerStartupTask(id, taskFactory).
 * The taskFactory receives a startup context from main.js and must return an async
 * function with the signature async (layerDefinition) => void.
 *
 * Put a task here only when a layer needs dedicated startup loading work:
 * - preloading data at boot
 * - staged loading with progress/loading messages
 * - post-load UI refresh or warmup
 *
 * Do not put plain visibility toggles or persistent UI state here; those still belong
 * to the layer registry/state flow in controls.js.
 */
const startupTaskRegistry = new Map();

export function resolveStartupMessage(layer, key, fallback) {
  const message = layer?.startupMessage;
  if (message && typeof message === "object" && key in message) {
    return message[key];
  }
  if (typeof message === "string" && message.trim()) {
    return message;
  }
  return fallback;
}

export function createLayerStartupTaskMap(context) {
  return Object.fromEntries(
    Array.from(startupTaskRegistry.entries()).map(([id, taskFactory]) => [
      id,
      taskFactory(context),
    ]),
  );
}

export function registerLayerStartupTask(id, taskFactory) {
  if (typeof id !== "string" || !id.trim()) {
    throw new Error("registerLayerStartupTask 需要有效的图层 id");
  }
  if (typeof taskFactory !== "function") {
    throw new Error("registerLayerStartupTask 需要可调用的任务工厂");
  }
  startupTaskRegistry.set(id, taskFactory);
}

function registerBuiltinLayerStartupTasks() {
  startupTaskRegistry.clear();
  registerCableStartupTask();
  registerSatelliteStartupTask();
  registerBGPStartupTask();
}

function registerCableStartupTask() {
  registerLayerStartupTask("cables", (context) => async (layer) => {
    if (!context.isCablesEnabled()) return;

    context.setLoadingMessage(
      resolveStartupMessage(layer, "prepare", "正在加载登陆点..."),
    );
    await context.yieldFrame(12);
    try {
      await loadLandingPoints(context.scene, context.earth, { silent: true });
    } catch (error) {
      context.reportError("登陆点", error);
    }
    if (context.isCancelled()) return;
    await context.yieldFrame(16);

    context.setLoadingMessage(
      resolveStartupMessage(layer, "load", "正在加载海缆..."),
    );
    await context.yieldFrame(12);
    try {
      await loadGeoJSONFromPath(context.scene, context.earth, { silent: true });
      if (!context.isCancelled() && context.isCablesEnabled()) {
        toggleCables(true);
        context.updateCableToggleUi(true);
        context.setLegendItems("cables", getCableLegendItems());
        context.refreshLegend();
      }
    } catch (error) {
      context.reportError(layer?.startupLabel || layer?.label || "海缆", error);
    }
    if (context.isCancelled()) return;
    await context.yieldFrame(16);
  });
}

function registerSatelliteStartupTask() {
  registerLayerStartupTask("satellites", (context) => async (layer) => {
    if (!context.isSatellitesEnabled()) return;

    context.setLoadingMessage(
      resolveStartupMessage(layer, "load", "正在加载卫星..."),
    );
    await context.yieldFrame(12);
    try {
      clearSatelliteData();
      const loadResult = await loadSatellites({
        limit: context.getInitialSatelliteLoadLimit(),
      });
      if (!context.isCancelled() && context.isSatellitesEnabled()) {
        context.updateSatelliteToggleUi(true, loadResult.count);
        context.setLegendItems("satellites", getSatelliteLegendItems());
        context.refreshLegend();
        context.scheduleSatellitePositionWarmup(() => {
          if (!context.isCancelled() && context.isSatellitesEnabled()) {
            toggleSatellites(true);
          }
        });

        if (context.shouldHydrateFullSatelliteSet(loadResult)) {
          const hydrationToken = context.nextSatelliteHydrationToken();
          context.hydrateAllSatellitesInBackground(
            () =>
              hydrationToken === context.getSatelliteHydrationToken() &&
              !context.isCancelled() &&
              context.isSatellitesEnabled(),
          );
        }
      }
    } catch (error) {
      context.reportError(layer?.startupLabel || layer?.label || "卫星", error);
    }
    if (context.isCancelled()) return;
    await context.yieldFrame(16);
  });
}

function registerBGPStartupTask() {
  registerLayerStartupTask("bgp", (context) => async (layer) => {
    context.setLoadingMessage(
      resolveStartupMessage(layer, "load", "正在加载BGP态势..."),
    );
    await context.yieldFrame(12);
    try {
      const bgpResult = await loadBGPAnomalies(context.scene, context.earth);
      if (!context.isCancelled()) {
        toggleBGP(context.getShowBGP());
        context.updateBGPHud(bgpResult);
        context.syncBGPKnownEventIds();
      }
    } catch (error) {
      context.reportError(layer?.startupLabel || layer?.label || "BGP态势", error);
    }
    if (context.isCancelled()) return;
    await context.yieldFrame(16);
  });
}

registerBuiltinLayerStartupTasks();