import { createContext, DomainError } from "@tailor-platform/erp-kit/app";
import { createResolver, t } from "@tailor-platform/sdk";
import { getDB } from "@/generated/kysely-tailordb";
import { coaModulesExport } from "@/modules";

// The five GL account classes coa-management supports.
const ACCOUNT_TYPES = ["ASSET", "LIABILITY", "EQUITY", "REVENUE", "EXPENSE"] as const;
type AccountType = (typeof ACCOUNT_TYPES)[number];

/**
 * createAccount — add a GL account to a company's chart of accounts.
 *
 * The bundled chart of accounts is otherwise seed-only (there is no other way to
 * add an account to a running workspace), so this resolver lets an operator add
 * missing accounts — e.g. a Cash / Bank Deposits (ASSET) account for outgoing
 * payments to credit — without a destructive re-seed. The native command
 * validates the owning company, requires a non-empty name and a well-formed
 * code, and rejects a code that already exists in the company. The account is
 * created ACTIVE.
 */
export default createResolver({
  name: "createAccount",
  operation: "mutation",
  input: {
    companyId: t.string().description("Owning company whose chart of accounts to add to"),
    code: t.string().description("GL account code, unique within the company (e.g. 1100)"),
    name: t.string().description("Account name (e.g. Cash)"),
    accountType: t.string().description(`Account class: ${ACCOUNT_TYPES.join(" | ")}`),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");

    const accountType = context.input.accountType as AccountType;
    if (!ACCOUNT_TYPES.includes(accountType)) {
      throw new DomainError(
        `Invalid accountType: ${context.input.accountType}. Expected one of ${ACCOUNT_TYPES.join(", ")}.`,
      );
    }

    return db
      .transaction()
      .execute(async (trx) => {
        const result = await coaModulesExport.commands.createAccount(
          trx,
          {
            companyId: context.input.companyId,
            code: context.input.code,
            name: context.input.name,
            accountType,
          },
          ctx,
        );

        if (!result.ok) {
          switch (result.error.code) {
            case "COA_MANAGEMENT_COMPANY_NOT_FOUND":
              throw new DomainError(`Company not found: ${context.input.companyId}`);
            case "COA_MANAGEMENT_COMPANY_INACTIVE":
              throw new DomainError(`Company is not active: ${context.input.companyId}`);
            case "COA_MANAGEMENT_DUPLICATE_ACCOUNT_CODE":
              throw new DomainError(
                `An account with code ${context.input.code} already exists in this company.`,
              );
            case "COA_MANAGEMENT_NAME_REQUIRED":
              throw new DomainError("Account name is required.");
            case "COA_MANAGEMENT_INVALID_ACCOUNT_CODE":
              throw new DomainError(`Invalid account code: ${context.input.code}.`);
            case "UNAUTHENTICATED":
              throw new DomainError("Authentication is required");
            case "INSUFFICIENT_PERMISSION":
              throw new DomainError("You do not have permission to perform this action");
            default:
              throw result.error satisfies never;
          }
        }

        return { id: result.value.account.id, code: result.value.account.code };
      })
      .catch((err: unknown) => {
        if (err instanceof DomainError) throw err;
        throw new Error("Failed to create the account", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Created account ID"),
      code: t.string().description("Account code"),
    })
    .description("Created GL account"),
});