import {configuration, constant, injectable, logger} from "@tsed/di";
import {$off, $on, $once} from "@tsed/hooks";

import {CONFIG_SOURCES} from "../constants/constants.js";
import type {ConfigurationExtends} from "../interfaces/ConfigSource.js";
import {getConfigSources} from "../utils/getConfigSources.js";
import {validate} from "../utils/validate.js";

export async function afterResolveConfiguration() {
  const sources = getConfigSources(constant<ConfigurationExtends>("extends", []));

  for (const source of sources.values()) {
    const {instance, watch, refreshOn, name, validationSchema} = source;
    const seed = Math.floor(Math.random() * 10000);
    const ref = name + "-" + seed;

    if (instance?.$onInit) {
      await instance.$onInit();
    }

    const getAll = instance.getAll;

    const refresh = async () => {
      let data = await getAll.apply(instance);

      if (validationSchema) {
        const {validate} = await import("../utils/validate.js");
        data = validate(name!, data, validationSchema);
      }

      configuration().set(data);
      configuration().set(`configs.${name}`, data);
    };

    instance.getAll = refresh as any;

    await refresh();

    // manage watcher
    if (watch && instance?.watch) {
      const closer = await instance.watch(refresh);

      closer && $once("$onDestroy", ref, closer);
    }

    // manager refresh on request
    if (refreshOn === "request") {
      $on("$onRequest", ref, refresh);
    }

    // manager refresh on response
    if (refreshOn === "response") {
      const onResponse = () => {
        refresh().catch((error) => {
          logger().error({
            event: "CONFIG_SOURCE_REFRESH_ERROR",
            hook: "$onResponse",
            error_name: error.name,
            error_message: error.message,
            error_stack: error.stack
          });
        });
      };

      $on("$onResponse", ref, onResponse);
    }

    $once("$onDestroy", ref, () => {
      if (instance?.$onDestroy) {
        // clean all event related to the same ref
        $off(ref);

        return instance.$onDestroy();
      }
    });
  }

  const configs = Object.fromEntries(
    [...sources.entries()].map(([key, source]) => {
      return [key, source.instance];
    })
  );

  injectable(CONFIG_SOURCES).value(configs);
}

$on("$afterResolveConfiguration", afterResolveConfiguration);