import { success, failure, appError, type Result, type AppError } from '@relink/shared';

export type ContractType = 'ACQUISITION' | 'DEMOLITION' | 'INTERIOR';

export interface CreateContractInput {
  readonly matchRequestStatus: string;
  readonly contractType: ContractType;
  readonly templateCode: string;
  readonly policyVersionId: string;
}

export interface ContractDraft {
  readonly contractType: ContractType;
  readonly status: 'DRAFT';
  readonly templateCode: string;
  readonly policyVersionId: string;
}

export function createContract(
  input: CreateContractInput,
): Result<ContractDraft, AppError> {
  // U021: 수락된 매칭만 계약 생성 가능
  if (input.matchRequestStatus !== 'ACCEPTED') {
    return failure(
      appError('MATCH_NOT_ACCEPTED', '수락된 매칭 요청만 계약을 생성할 수 있습니다.', {
        matchRequestStatus: input.matchRequestStatus,
      }),
    );
  }

  // U022: 템플릿 코드 필수
  if (!input.templateCode.trim()) {
    return failure(
      appError('VALIDATION_ERROR', '계약 템플릿 코드는 필수입니다.', { field: 'templateCode' }),
    );
  }

  // U022: 정책 버전 필수
  if (!input.policyVersionId.trim()) {
    return failure(
      appError('VALIDATION_ERROR', '정책 버전은 필수입니다.', { field: 'policyVersionId' }),
    );
  }

  return success({
    contractType: input.contractType,
    status: 'DRAFT' as const,
    templateCode: input.templateCode,
    policyVersionId: input.policyVersionId,
  });
}