const eventParser = require("./eventParser");
const { client: gqlClient } = require("../../graphql-client/graphql-client");
const queries = require("../../graphql-client/queries");
const { isEmpty, isFunction } = require("lodash");
const { getMatchingScenarios } = require("./scenarioMapperr");

const scenarioParser = async (req, jobIdField) => {
  // Destructure required fields from the request body
  const { event, trigger, table } = req.body;

  if (!event?.data || !trigger || !table) {
    throw new Error("Missing required request fields: event data, trigger, or table.");
  }

  // Step 1: Parse the changes from the event
  const eventData = await eventParser({
    newData: event.data.new,
    oldData: event.data.old,
    trigger,
    table,
    jobIdField
  });

  // Step 2: Query jobWatchers for this job
  const watcherData = await gqlClient.request(queries.GET_JOB_WATCHERS, {
    jobid: eventData.jobId
  });

  const jobWatchers = watcherData?.job_watchers_aggregate?.nodes?.map((watcher) => ({
    email: watcher.user_email,
    firstName: watcher?.user?.employee?.first_name,
    lastName: watcher?.user?.employee?.last_name,
    employeeId: watcher?.user?.employee?.id
  }));

  if (isEmpty(jobWatchers)) {
    return;
  }

  // Step 3: Infer bodyshop information from the job and validate
  const bodyShopId = watcherData?.job?.bodyshop?.id;
  const bodyShopName = watcherData?.job?.bodyshop?.shopname;

  if (!bodyShopId || !bodyShopName) {
    throw new Error("No bodyshop data found for this job.");
  }

  // Step 4: Get matching scenarios based on eventData and jobWatchers
  const matchingScenarios = getMatchingScenarios({
    ...eventData,
    jobWatchers,
    bodyShopId,
    bodyShopName
  });

  if (isEmpty(matchingScenarios)) {
    return;
  }

  // Prepare the final scenario data
  const finalScenarioData = {
    ...eventData,
    jobWatchers,
    bodyShopId,
    bodyShopName,
    matchingScenarios
  };

  // Step 5: Query associations (notification_settings) for each watcher
  // Filter by both useremail and shopid
  const associationsData = await gqlClient.request(queries.GET_NOTIFICATION_ASSOCIATIONS, {
    emails: jobWatchers.map((x) => x.email),
    shopid: bodyShopId
  });

  if (isEmpty(associationsData?.associations)) {
    return;
  }

  // Step 6: For each matching scenario, add a scenarioWatchers property
  // that includes only the jobWatchers with at least one notification method enabled.
  // Each watcher object is formatted as: { user, email, app, fcm }
  finalScenarioData.matchingScenarios = finalScenarioData.matchingScenarios.map((scenario) => ({
    ...scenario,
    scenarioWatchers: associationsData.associations
      .filter((assoc) => {
        // Retrieve the settings object for this scenario (it now contains app, email, and fcm)
        const settings = assoc.notification_settings && assoc.notification_settings[scenario.key];
        // Only include this association if at least one notification channel is enabled
        return settings && (settings.app || settings.email || settings.fcm);
      })
      .map((assoc) => {
        const settings = assoc.notification_settings[scenario.key];
        // Determine the email from the association—either from assoc.user or assoc.useremail
        const watcherEmail = assoc.user || assoc.useremail;
        // Find the matching watcher object from jobWatchers using the email address
        const matchingWatcher = jobWatchers.find((watcher) => watcher.email === watcherEmail);

        return {
          // This is the common identifier (email in this case)
          user: watcherEmail,
          // Notification settings for this scenario
          email: settings.email,
          app: settings.app,
          fcm: settings.fcm,
          // Additional fields from the watcher lookup
          firstName: matchingWatcher ? matchingWatcher.firstName : undefined,
          lastName: matchingWatcher ? matchingWatcher.lastName : undefined,
          employeeId: matchingWatcher ? matchingWatcher.employeeId : undefined
        };
      })
  }));

  if (isEmpty(finalScenarioData?.matchingScenarios)) {
    return;
  }

  // Step 7: Call builder functions for each matching scenario (fire-and-forget)
  // Only invoke a builder if its scenario has at least one watcher
  for (const scenario of finalScenarioData.matchingScenarios) {
    if (isEmpty(scenario.scenarioWatchers) || !isFunction(scenario.builder)) {
      continue;
    }
    scenario
      .builder({
        trigger: finalScenarioData.trigger.name,
        bodyShopId: finalScenarioData.bodyShopId,
        bodyShopName: finalScenarioData.bodyShopName,
        scenarioKey: scenario.key,
        scenarioTable: scenario.table,
        scenarioFields: scenario.fields,
        scenarioBuilder: scenario.builder,
        scenarioWatchers: scenario.scenarioWatchers,
        jobId: finalScenarioData.jobId,
        isNew: finalScenarioData.isNew,
        changedFieldNames: finalScenarioData.changedFieldNames,
        changedFields: finalScenarioData.changedFields,
        data: finalScenarioData.data
      })
      .catch((error) => console.error(`Error in builder for scenario '${scenario.key}':`, error));
  }
};

module.exports = scenarioParser;