import { REPAIR_LINE_AMOUNT_TOMAN } from "src/constants/repair-amount-limits";
import { parseMoneyAmountToman } from "src/utils/unicode-digits";

type ExpertReplyPricingPart = {
  partId?: unknown;
  price?: unknown;
  salary?: unknown;
  totalPayment?: unknown;
};

/**
 * Validates the pricing that an expert must provide for every submitted
 * damaged-part line. This is deliberately independent of DTO validation:
 * legacy endpoints and deployments without a global ValidationPipe call the
 * service directly.
 */
export function getExpertReplyPricingValidationError(
  parts: unknown,
): string | null {
  if (!Array.isArray(parts) || parts.length === 0) {
    return "At least one damaged part with pricing is required to submit an expert reply.";
  }

  for (const [index, rawPart] of parts.entries()) {
    const part = rawPart as ExpertReplyPricingPart | null;
    const label =
      part && part.partId != null && String(part.partId).trim() !== ""
        ? `Part ${String(part.partId)}`
        : `Damaged part ${index + 1}`;

    if (!part || typeof part !== "object") {
      return `${label} must include price, salary, and totalPayment.`;
    }

    const price = parseMoneyAmountToman(part.price);
    const salary = parseMoneyAmountToman(part.salary);
    const totalPayment = parseMoneyAmountToman(part.totalPayment);

    const splitAmountIsValid = (amount: number | null) =>
      amount !== null &&
      (amount === 0 ||
        (amount >= REPAIR_LINE_AMOUNT_TOMAN.MIN &&
          amount <= REPAIR_LINE_AMOUNT_TOMAN.MAX));
    const totalIsValid =
      totalPayment !== null &&
      totalPayment >= REPAIR_LINE_AMOUNT_TOMAN.MIN &&
      totalPayment <= REPAIR_LINE_AMOUNT_TOMAN.MAX;

    if (
      !splitAmountIsValid(price) ||
      !splitAmountIsValid(salary) ||
      !totalIsValid
    ) {
      return `${label} requires valid price, salary, and totalPayment. Price and salary may be 0; totalPayment must be between ${REPAIR_LINE_AMOUNT_TOMAN.MIN.toLocaleString("en-US")} and ${REPAIR_LINE_AMOUNT_TOMAN.MAX.toLocaleString("en-US")} Toman.`;
    }
  }

  return null;
}