import type { JsonTaxCatalogProvider } from "@erp/core";
import { type ITransactionManager, isEntityNotFoundError } from "@erp/core/api";
import type { ProformaPublicServices } from "@erp/customer-invoices/api";
import {
  type InvoiceAmount,
  InvoicePaymentMethod,
  type InvoiceRecipient,
  InvoiceStatus,
  type ItemAmount,
  type Proforma,
} from "@erp/customer-invoices/api/domain";
import type { CustomerPublicServices } from "@erp/customers/api";
import {
  type Customer,
  CustomerStatus,
  CustomerTaxes,
  type ICustomerCreateProps,
} from "@erp/customers/api/domain";
import {
  type Name,
  type PhoneNumber,
  type TextValue,
  UniqueID,
  ValidationErrorCollection,
  type ValidationErrorDetail,
} from "@repo/rdx-ddd";
import { Maybe, Result } from "@repo/rdx-utils";
import type { Transaction } from "sequelize";

import type { CreateProformaFromFactugesRequestDTO } from "../../../common";
import type { FactugesProformaPayload, ICreateProformaFromFactugesInputMapper } from "../mappers";

import paymentsCatalog from "./payments.json";

type FakePaymentMethod = {
  id: UniqueID;
  description: string;
  factuges_id: string;
};

type CreateProformaFromFactugesUseCaseInput = {
  companyId: UniqueID;
  dto: CreateProformaFromFactugesRequestDTO;
};

type CreateProformaFromFactugesUseCaseDeps = {
  customerServices: CustomerPublicServices;
  proformaServices: ProformaPublicServices;
  dtoMapper: ICreateProformaFromFactugesInputMapper;
  taxCatalog: JsonTaxCatalogProvider;
  transactionManager: ITransactionManager;
};

type CreateProformaProps = Parameters<ProformaPublicServices["createProforma"]>["1"];

export class CreateProformaFromFactugesUseCase {
  private readonly dtoMapper: ICreateProformaFromFactugesInputMapper;
  private readonly customerServices: CustomerPublicServices;
  private readonly proformaServices: ProformaPublicServices;
  private readonly taxCatalog: JsonTaxCatalogProvider;
  private readonly transactionManager: ITransactionManager;

  constructor(deps: CreateProformaFromFactugesUseCaseDeps) {
    this.customerServices = deps.customerServices;
    this.proformaServices = deps.proformaServices;
    this.dtoMapper = deps.dtoMapper;
    this.taxCatalog = deps.taxCatalog;
    this.transactionManager = deps.transactionManager;
  }

  public async execute(params: CreateProformaFromFactugesUseCaseInput) {
    const { dto, companyId } = params;

    // 1) Mapear DTO → props
    const mappedPropsResult = this.dtoMapper.map(dto, { companyId });
    if (mappedPropsResult.isFailure) {
      return Result.fail(mappedPropsResult.error);
    }

    const { customerLookup, paymentLookup, customerDraft, proformaDraft, paymentDraft } =
      mappedPropsResult.data;

    return this.transactionManager.complete(async (transaction: Transaction) => {
      try {
        const customerResult = await this.resolveCustomer(customerLookup, customerDraft, {
          companyId,
          transaction,
        });
        if (customerResult.isFailure) {
          return Result.fail(customerResult.error);
        }

        const customer = customerResult.data;

        const paymentResult = await this.resolvePayment(paymentLookup, paymentDraft, {
          companyId,
          transaction,
        });
        if (paymentResult.isFailure) {
          return Result.fail(paymentResult.error);
        }

        const payment = paymentResult.data;

        // Crear la proforma para ese cliente
        const createPropsResult = this.buildProformaCreateProps({
          proformaDraft,
          payment,
          customerId: customer.id,
          context: {
            companyId,
            transaction,
          },
        });

        if (createPropsResult.isFailure) {
          return Result.fail(createPropsResult.error);
        }

        const newId = UniqueID.generateNewID();

        const createResult = await this.proformaServices.createProforma(
          newId,
          createPropsResult.data,
          {
            companyId,
            transaction,
          }
        );

        if (createResult.isFailure) {
          return Result.fail(createResult.error);
        }

        // Valida que los datos de entrada coincidan con el snapshot
        const proforma = createResult.data;
        const validationResult = this.validateDraftAgainstProforma(proformaDraft, proforma);
        if (validationResult.isFailure) {
          return Result.fail(validationResult.error);
        }

        const readResult = await this.proformaServices.getProformaSnapshotById(
          createResult.data.id,
          {
            companyId,
            transaction,
          }
        );

        if (readResult.isFailure) {
          return Result.fail(readResult.error);
        }

        const snapshot = readResult.data;

        const result = {
          customer_id: customer.id.toString(),
          proforma_id: snapshot.id.toString(),
        };

        return Result.ok(result);
      } catch (error: unknown) {
        return Result.fail(error as Error);
      }
    });
  }

  /**
   * Valida que las magnitudes importadas del borrador coincidan con la proforma
   * generada por el dominio.
   *
   * Motivo:
   * - Detecta divergencias entre el payload legacy y los cálculos reales del dominio.
   * - Actúa como validación de reconciliación, no como sustituto de las invariantes del agregado.
   */
  private validateDraftAgainstProforma(
    proformaDraft: FactugesProformaPayload["proformaDraft"],
    proforma: Proforma
  ): Result<void, Error> {
    const errors: ValidationErrorDetail[] = [];
    const proformaTotals = proforma.totals();

    if (proformaDraft.items.length !== proforma.items.size()) {
      errors.push({
        path: "items",
        message: "La cantidad de ítems de la proforma no coincide con los datos de entrada.",
      });
    }

    this.validateOptionalExpectedAmount({
      expected: proformaDraft.subtotalAmount,
      actual: proformaTotals.subtotalAmount,
      path: "subtotalAmount",
      message: "El subtotal de la proforma no coincide con los datos de entrada.",
      errors,
    });

    this.validateOptionalExpectedAmount({
      expected: proformaDraft.taxableAmount,
      actual: proformaTotals.taxableAmount,
      path: "taxableAmount",
      message: "La base imponible de la proforma no coincide con los datos de entrada.",
      errors,
    });

    this.validateOptionalExpectedAmount({
      expected: proformaDraft.taxesAmount,
      actual: proformaTotals.taxesAmount,
      path: "taxesAmount",
      message: "La suma de impuestos de la proforma no coincide con los datos de entrada.",
      errors,
    });

    this.validateOptionalExpectedAmount({
      expected: proformaDraft.totalAmount,
      actual: proformaTotals.totalAmount,
      path: "totalAmount",
      message: "El total de la proforma no coincide con los datos de entrada.",
      errors,
    });

    if (errors.length > 0) {
      return Result.fail(
        new ValidationErrorCollection(
          "La proforma generada no coincide con las magnitudes validadas del borrador importado.",
          errors
        )
      );
    }

    return Result.ok();
  }

  private validateOptionalExpectedAmount(params: {
    expected: Maybe<InvoiceAmount | ItemAmount>;
    actual: InvoiceAmount | ItemAmount;
    path: string;
    message: string;
    errors: ValidationErrorDetail[];
  }): void {
    const { expected, actual, path, message, errors } = params;

    if (expected.isNone()) {
      return;
    }

    const expectedAmount = expected.unwrap();

    if (!actual.equalsTo(expectedAmount)) {
      errors.push({
        path,
        message: this.buildAmountMismatchMessage({
          baseMessage: message,
          expected: expectedAmount,
          actual,
        }),
      });
    }
  }

  private buildAmountMismatchMessage(params: {
    baseMessage: string;
    expected: InvoiceAmount | ItemAmount;
    actual: InvoiceAmount | ItemAmount;
  }): string {
    const { baseMessage, expected, actual } = params;

    return `${baseMessage} FactuGES: ${expected.formattedValue}. Calculado: ${actual.formattedValue}.`;
  }

  /**
   * Valida un importe opcional esperado contra un importe real también opcional.
   *
   * Motivo:
   * - Algunos campos pueden faltar tanto en el payload importado como en
   *   la proyección o snapshot generado.
   * - Si el esperado existe pero el real no, se considera discrepancia.
   */
  private validateOptionalMaybeAmount(params: {
    expected: Maybe<InvoiceAmount | ItemAmount>;
    actual: Maybe<InvoiceAmount | ItemAmount>;
    path: string;
    message: string;
    errors: ValidationErrorDetail[];
  }): void {
    const { expected, actual, path, message, errors } = params;

    if (expected.isNone()) {
      return;
    }

    if (actual.isNone()) {
      errors.push({
        path,
        message,
      });
      return;
    }

    if (!actual.unwrap().equals(expected.unwrap())) {
      errors.push({
        path,
        message,
      });
    }
  }

  private buildProformaCreateProps(deps: {
    proformaDraft: FactugesProformaPayload["proformaDraft"];
    customerId: UniqueID;
    payment: FakePaymentMethod;
    context: {
      companyId: UniqueID;
      transaction: Transaction;
    };
  }): Result<CreateProformaProps, Error> {
    const { proformaDraft, payment, customerId, context } = deps;
    const { companyId } = context;

    const defaultStatus = InvoiceStatus.approved();
    const recipient = Maybe.none<InvoiceRecipient>();
    const paymentMethod = Maybe.some(
      InvoicePaymentMethod.create({ paymentDescription: payment.description }, payment.id).data
    );

    return Result.ok({
      ...proformaDraft,
      companyId,
      customerId,
      status: defaultStatus,
      paymentMethod,
      recipient,
    });
  }

  /**
   * Resuelve un cliente existente o lo crea si todavía no existe.
   *
   * Motivo:
   * - Centraliza la política "find or create" del caso de uso.
   * - Evita duplicar lógica de control y branching en `execute`.
   * - Separa los datos de búsqueda de los datos necesarios para alta.
   *
   * @param customerLookup - Datos mínimos para localizar un cliente existente.
   * @param customerDraft - Datos necesarios para crear el cliente si no existe.
   * @param context - Contexto transaccional y de compañía.
   * @returns `Result` con el cliente resuelto o el error producido.
   */
  private async resolveCustomer(
    customerLookup: FactugesProformaPayload["customerLookup"],
    customerDraft: FactugesProformaPayload["customerDraft"],
    context: {
      companyId: UniqueID;
      transaction: Transaction;
    }
  ): Promise<Result<Customer, Error>> {
    const { companyId, transaction } = context;

    const existingCustomerResult = await this.customerServices.findCustomerByTIN(
      customerLookup.tin,
      { companyId, transaction }
    );

    if (existingCustomerResult.isSuccess) {
      return Result.ok(existingCustomerResult.data);
    }

    if (!isEntityNotFoundError(existingCustomerResult.error)) {
      return Result.fail(existingCustomerResult.error);
    }

    const createPropsResult = this.buildCustomerCreateProps(customerDraft, context);
    if (createPropsResult.isFailure) {
      return Result.fail(createPropsResult.error);
    }

    return this.customerServices.createCustomer(UniqueID.generateNewID(), createPropsResult.data, {
      companyId,
      transaction,
    });
  }

  private async resolvePayment(
    paymentLookup: FactugesProformaPayload["paymentLookup"],
    paymentDraft: FactugesProformaPayload["paymentDraft"],
    context: {
      companyId: UniqueID;
      transaction: Transaction;
    }
  ): Promise<Result<FakePaymentMethod, Error>> {
    const { companyId, transaction } = context;

    const existingPaymentResult = paymentsCatalog.find(
      (payment) =>
        payment.factuges_id === paymentLookup.factuges_id &&
        payment.company_id === companyId.toString()
    );

    if (existingPaymentResult) {
      return Result.ok({
        id: UniqueID.create(existingPaymentResult.id).data,
        description: existingPaymentResult.description,
        factuges_id: existingPaymentResult.factuges_id,
      });
    }

    return Result.fail(new Error("Forma de pago no existe!!!"));
  }

  private buildCustomerCreateProps(
    customerDraft: FactugesProformaPayload["customerDraft"],
    context: {
      companyId: UniqueID;
      transaction: Transaction;
    }
  ): Result<ICustomerCreateProps, Error> {
    const { companyId } = context;

    const status = CustomerStatus.createActive();

    const defaultTaxes = CustomerTaxes.fromKey("iva_21;#;#", this.taxCatalog);

    if (defaultTaxes.isFailure) {
      return Result.fail(defaultTaxes.error);
    }

    const tin = Maybe.some(customerDraft.tin);
    const tradeName = Maybe.none<Name>();
    const reference = Maybe.none<Name>();
    const fax = Maybe.none<PhoneNumber>();
    const legalRecord = Maybe.none<TextValue>();

    return Result.ok({
      ...customerDraft,
      companyId,
      status,
      tin,
      tradeName,
      reference,
      fax,
      legalRecord,
      defaultTaxes: defaultTaxes.data,
    });
  }
}