/**
 * Shared utilities used by all job processors.
 * Avoids duplicating helpers that currently live inside route files.
 */
import axios from "axios";
import PDFDocument from "pdfkit";
import fsSync from "fs";
import { storage } from "../../storage";
import {
  InsertPatient,
  insertPatientSchema,
} from "../../../../../packages/db/types/patient-types";

const SELENIUM_BASE_URL =
  process.env.SELENIUM_AGENT_BASE_URL || "http://localhost:5002";

// ---------------------------------------------------------------------------
// Python service helpers
// ---------------------------------------------------------------------------

/**
 * Call a synchronous Python service endpoint and return its result.
 * The Python service runs the selenium job inline and returns the result directly.
 * Timeout is long (8 min) to accommodate slow selenium flows.
 */
export async function callPythonSync(
  endpoint: string,
  payload: any,
  timeoutMs = 8 * 60 * 1000
): Promise<any> {
  const resp = await axios.post(
    `${SELENIUM_BASE_URL}${endpoint}`,
    payload,
    { timeout: timeoutMs }
  );
  const data = resp.data;
  if (data?.status === "error") {
    const msg =
      typeof data.message === "string"
        ? data.message
        : data.message?.msg ?? "Selenium returned error status";
    throw new Error(msg);
  }
  return data;
}

// ---------------------------------------------------------------------------
// General utilities
// ---------------------------------------------------------------------------

export function sleep(ms: number) {
  return new Promise<void>((r) => setTimeout(r, ms));
}

export function splitName(fullName?: string | null) {
  if (!fullName) return { firstName: "", lastName: "" };
  const parts = fullName.trim().split(/\s+/).filter(Boolean);
  const firstName = parts.shift() ?? "";
  const lastName = parts.join(" ") ?? "";
  return { firstName, lastName };
}

export async function imageToPdfBuffer(imagePath: string): Promise<Buffer> {
  return new Promise<Buffer>((resolve, reject) => {
    try {
      const doc = new PDFDocument({ autoFirstPage: false });
      const chunks: Uint8Array[] = [];
      doc.on("data", (c: any) => chunks.push(c));
      doc.on("end", () => resolve(Buffer.concat(chunks)));
      doc.on("error", reject);

      const A4_W = 595.28;
      const A4_H = 841.89;
      doc.addPage({ size: [A4_W, A4_H] });
      doc.image(imagePath, 0, 0, { fit: [A4_W, A4_H], align: "center", valign: "center" });
      doc.end();
    } catch (e) {
      reject(e);
    }
  });
}

// ---------------------------------------------------------------------------
// Patient DB helpers
// ---------------------------------------------------------------------------

export async function createOrUpdatePatientByInsuranceId(options: {
  insuranceId: string;
  firstName?: string | null;
  lastName?: string | null;
  dob?: string | Date | null;
  userId: number;
}) {
  const { insuranceId, firstName, lastName, dob, userId } = options;
  if (!insuranceId) throw new Error("Missing insuranceId");

  const incomingFirst = (firstName || "").trim();
  const incomingLast = (lastName || "").trim();

  let patient = await storage.getPatientByInsuranceId(insuranceId);

  if (patient && patient.id) {
    const updates: any = {};
    if (incomingFirst && String(patient.firstName ?? "").trim() !== incomingFirst)
      updates.firstName = incomingFirst;
    if (incomingLast && String(patient.lastName ?? "").trim() !== incomingLast)
      updates.lastName = incomingLast;
    if (dob && !patient.dateOfBirth) {
      const parsed = new Date(dob);
      if (!isNaN(parsed.getTime())) updates.dateOfBirth = parsed;
    }
    if (Object.keys(updates).length > 0) {
      await storage.updatePatient(patient.id, updates);
      patient = await storage.getPatientByInsuranceId(insuranceId);
    }
    return patient;
  }

  const createPayload: any = {
    firstName: incomingFirst,
    lastName: incomingLast,
    dateOfBirth: dob,
    gender: "",
    phone: "",
    userId,
    insuranceId,
  };

  let patientData: InsertPatient;
  try {
    patientData = insertPatientSchema.parse(createPayload);
  } catch {
    // Remove fields that may fail validation (invalid date or alphanumeric insuranceId)
    const safePayload = { ...createPayload };
    delete safePayload.dateOfBirth;
    try {
      patientData = insertPatientSchema.parse(safePayload);
    } catch {
      // Last resort: skip schema validation and cast directly
      patientData = safePayload as InsertPatient;
    }
  }

  await storage.createPatient(patientData);
  return storage.getPatientByInsuranceId(insuranceId);
}