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];

/**
 * updateAccount — edit a GL account's code, name, or class.
 *
 * A partial patch: only the provided fields change. The native command
 * re-validates a changed code (well-formed and unique within the company) and a
 * non-empty name. Account status is NOT edited here — it is managed by
 * deactivateAccount / reactivateAccount. `id` is the Account id.
 */
export default createResolver({
  name: "updateAccount",
  operation: "mutation",
  input: {
    id: t.string().description("Account ID"),
    code: t
      .string({ optional: true })
      .description("New GL account code, unique within the company (e.g. 1200)"),
    name: t.string({ optional: true }).description("New account name"),
    accountType: t
      .string({ optional: true })
      .description(`New account class: ${ACCOUNT_TYPES.join(" | ")}`),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");

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

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

        if (!result.ok) {
          switch (result.error.code) {
            case "COA_MANAGEMENT_ACCOUNT_NOT_FOUND":
              throw new DomainError(`Account not found: ${context.input.id}`);
            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 "COA_MANAGEMENT_DUPLICATE_ACCOUNT_CODE":
              throw new DomainError(
                `An account with code ${context.input.code} already exists in this company.`,
              );
            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 update the account", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Updated account ID"),
      code: t.string().description("Account code"),
    })
    .description("Updated GL account"),
});