import { ok, err, type CommandContext } from "@tailor-platform/erp-kit/core";
import { companyLifecycle } from "../db/company.lifecycle.generated";
import type { Transaction } from "../generated/kysely-tailordb";
import {
  CompanyNotFoundError,
  InvalidStateError,
  MissingRequiredFieldsError,
  InvalidBaseCurrencyError,
} from "../lib/errors.generated";
import type { PrimitivesQueries } from "../module";

export interface ActivateCompanyInput {
  companyId: string;
}

/**
 * Function: activateCompany
 *
 * Transitions a company from DRAFT to ACTIVE status, making it available for
 * transactional modules to reference. All required fields must be configured
 * before activation.
 */
export async function run(
  db: Transaction,
  input: ActivateCompanyInput,
  ctx: CommandContext,
  primitivesQueries?: Pick<PrimitivesQueries, "getCurrency">,
) {
  const { companyId } = input;

  // 1. Find company with forUpdate
  const existing = await db
    .selectFrom("Company")
    .selectAll()
    .where("id", "=", companyId)
    .forUpdate()
    .executeTakeFirst();

  if (!existing) {
    return err(new CompanyNotFoundError(companyId));
  }

  // 2. Must be DRAFT
  const nextStatus = companyLifecycle.tryTransition(existing.status, "activate");
  if (!nextStatus) {
    return err(new InvalidStateError(companyId));
  }

  // 3. Check required fields
  if (
    !existing.legalName ||
    (typeof existing.legalName === "string" && existing.legalName.trim() === "")
  ) {
    return err(new MissingRequiredFieldsError(companyId));
  }
  if (!existing.baseCurrencyId) {
    return err(new MissingRequiredFieldsError(companyId));
  }
  if (!existing.street) {
    return err(new MissingRequiredFieldsError(companyId));
  }
  if (!existing.city) {
    return err(new MissingRequiredFieldsError(companyId));
  }
  if (!existing.postalCode) {
    return err(new MissingRequiredFieldsError(companyId));
  }
  if (!existing.country) {
    return err(new MissingRequiredFieldsError(companyId));
  }

  // 4. Validate base currency exists and is active
  if (primitivesQueries) {
    const { currency } = (
      await primitivesQueries.getCurrency(db, { id: existing.baseCurrencyId }, ctx)
    ).value;
    if (currency?.status !== "ACTIVE") {
      return err(new InvalidBaseCurrencyError(companyId));
    }
  }

  // 5. Set status ACTIVE
  const company = await db
    .updateTable("Company")
    .set({
      status: nextStatus,
    })
    .where("id", "=", companyId)
    .returningAll()
    .executeTakeFirstOrThrow();

  return ok({ company });
}