import { Contract } from './entities/contract.entity';

/**
 * Resolves which seeded clearance FileUploadSetting applies to a contract during
 * the CONTRACT pre-booking phase (Path B). Mirrors clearance.util.ts but emits
 * `contract_clearance_*` codes keyed on (tradeDirection, freightType, customs).
 */

type Op = 'import' | 'export';
type Freight = 'container' | 'bulk';

/** Trade direction → clearance operation. DOMESTIC has no customs clearance. */
function operationFor(tradeDirection: string): Op | null {
  if (tradeDirection === 'IMPORT') return 'import';
  if (tradeDirection === 'EXPORT') return 'export';
  return null; // DOMESTIC / intercity — no clearance gate
}

function freightFor(freightType: string): Freight {
  return freightType === 'BULK' ? 'bulk' : 'container';
}

/**
 * The customer-input clearance setting code, or null when no gate applies.
 *
 * - Path B (customs bundled): the customer uploads the documents GL needs to do
 *   the clearance work → `contract_clearance_{op}_{freight}`.
 * - Path A (no customs): the customer clears the cargo himself and uploads his
 *   own (smaller) clearance proof set → `contract_clearance_selfclear_{op}_{freight}`,
 *   reviewed by Operations rather than GL.
 *
 * DOMESTIC/intercity has no border, so no clearance gate applies on either path.
 */
export function contractClearanceSettingCode(
  tradeDirection: string,
  freightType: string,
  includesCustoms: boolean,
): string | null {
  const op = operationFor(tradeDirection);
  if (!op) return null;
  const freight = freightFor(freightType);
  if (!includesCustoms) {
    return `contract_clearance_selfclear_${op}_${freight}`;
  }
  return `contract_clearance_${op}_${freight}`;
}

/** The GL-output (customs output) setting code, keyed on op + freight. */
export function contractClearanceOutputSettingCode(
  tradeDirection: string,
  freightType: string,
  includesCustoms: boolean,
): string | null {
  if (!includesCustoms) return null;
  const op = operationFor(tradeDirection);
  if (!op) return null;
  const freight = freightFor(freightType);
  return `contract_clearance_output_${op}_${freight}`;
}

/** Convenience: resolve both codes for a loaded contract. */
export function contractClearanceCodes(contract: Contract): {
  inputCode: string | null;
  outputCode: string | null;
  includesCustoms: boolean;
} {
  const includesCustoms = contract.customsClearingEnabled ?? false;
  return {
    inputCode: contractClearanceSettingCode(
      contract.tradeDirection,
      contract.freightType,
      includesCustoms,
    ),
    outputCode: contractClearanceOutputSettingCode(
      contract.tradeDirection,
      contract.freightType,
      includesCustoms,
    ),
    includesCustoms,
  };
}