import "server-only";
import { TConnectorFormbricksMapping, THubFieldType } from "@formbricks/types/connector";
import { TResponse, TResponseData, TResponseDataValue } from "@formbricks/types/responses";
import { TSurveyElement } from "@formbricks/types/surveys/elements";
import { TSurvey } from "@formbricks/types/surveys/types";
import { getTextContent } from "@formbricks/types/surveys/validation";
import { getLocalizedValue } from "@/lib/i18n/utils";
import { getElementsFromBlocks } from "@/lib/survey/utils";
import type { FeedbackRecordCreateParams } from "@/modules/hub";

const getHeadlineFromElement = (element?: TSurveyElement): string => {
  if (!element?.headline) return "Untitled";
  const raw = getLocalizedValue(element.headline, "default");
  return getTextContent(raw) || "Untitled";
};

const toIsoTimestamp = (value: unknown): string | null => {
  if (value instanceof Date) {
    return Number.isNaN(value.getTime()) ? null : value.toISOString();
  }

  if (typeof value === "string" || typeof value === "number") {
    const parsed = new Date(value);
    return Number.isNaN(parsed.getTime()) ? null : parsed.toISOString();
  }

  return null;
};

const getCollectedAt = (response: TResponse): string => {
  return toIsoTimestamp(response.createdAt) ?? toIsoTimestamp(response.updatedAt) ?? new Date().toISOString();
};

function extractResponseValue(responseData: TResponseData, elementId: string): TResponseDataValue {
  if (!responseData || typeof responseData !== "object") return undefined;
  return responseData[elementId];
}

const convertValueToHubFields = (
  value: TResponseDataValue,
  hubFieldType: THubFieldType
): Partial<
  Pick<FeedbackRecordCreateParams, "value_text" | "value_number" | "value_boolean" | "value_date">
> => {
  if (value === undefined || value === null) {
    return {};
  }

  switch (hubFieldType) {
    case "text":
      if (typeof value === "string") return { value_text: value };
      if (Array.isArray(value)) return { value_text: value.join(", ") };
      if (typeof value === "object") return { value_text: JSON.stringify(value) };
      return { value_text: String(value) };

    case "number":
    case "rating":
    case "nps":
    case "csat":
    case "ces":
      if (typeof value === "number") return { value_number: value };
      if (typeof value === "string") {
        const parsed = Number.parseFloat(value);
        if (!Number.isNaN(parsed)) return { value_number: parsed };
      }
      return {};

    case "boolean":
      if (typeof value === "boolean") return { value_boolean: value };
      if (typeof value === "string") {
        return { value_boolean: value.toLowerCase() === "true" || value === "1" };
      }
      return {};

    case "date":
      if (typeof value === "string") {
        const date = new Date(value);
        if (!Number.isNaN(date.getTime())) return { value_date: date.toISOString() };
      }
      if (value instanceof Date) return { value_date: value.toISOString() };
      return {};

    case "categorical":
      if (typeof value === "string") return { value_text: value };
      if (Array.isArray(value)) return { value_text: value.join(", ") };
      return { value_text: String(value) };

    default:
      return { value_text: typeof value === "string" ? value : String(value) };
  }
};

/**
 * Transform a Formbricks survey response into FeedbackRecord payloads.
 * Called from the pipeline handler when a response is created/finished.
 */
export function transformResponseToFeedbackRecords(
  response: TResponse,
  survey: TSurvey,
  mappings: TConnectorFormbricksMapping[],
  tenantId: string
): FeedbackRecordCreateParams[] {
  const responseData = response.data;
  if (!responseData) return [];

  const surveyMappings = mappings.filter((m) => m.surveyId === survey.id);
  const elements = getElementsFromBlocks(survey.blocks);
  const elementMap = new Map(elements.map((el) => [el.id, el]));
  const feedbackRecords: FeedbackRecordCreateParams[] = [];

  for (const mapping of surveyMappings) {
    const value = extractResponseValue(responseData, mapping.elementId);
    if (value === undefined || value === null || value === "") continue;

    const fieldLabel = mapping.customFieldLabel || getHeadlineFromElement(elementMap.get(mapping.elementId));
    const valueFields = convertValueToHubFields(value, mapping.hubFieldType);

    const feedbackRecord = {
      collected_at: getCollectedAt(response),
      source_type: "formbricks_survey",
      submission_id: response.id,
      tenant_id: tenantId,
      field_id: mapping.elementId,
      field_type: mapping.hubFieldType,
      source_id: survey.id,
      source_name: survey.name,
      field_label: fieldLabel,
      ...(response.language && response.language !== "default" ? { language: response.language } : {}),
      ...(response.contact?.userId ? { user_identifier: response.contact.userId } : {}),
      ...valueFields,
    };

    feedbackRecords.push(feedbackRecord as FeedbackRecordCreateParams);
  }

  return feedbackRecords;
}