import { ok, err, type CommandContext } from "@tailor-platform/erp-kit/core";
import { stockAdjustmentLifecycle } from "../db/stockAdjustment.lifecycle.generated";
import type { Transaction } from "../generated/kysely-tailordb";
import {
  StockAdjustmentNotFoundError,
  InvalidStatusError,
  ItemNotFoundError,
} from "../lib/errors.generated";
import type { ItemManagementQueries } from "../module";

export interface SubmitStockAdjustmentInput {
  id: string;
}

/**
 * Function: submitStockAdjustment
 *
 * Transitions a stock adjustment from DRAFT to SUBMITTED status.
 * No inventory changes occur at this stage; posting happens on confirm.
 */
export async function run(
  db: Transaction,
  input: SubmitStockAdjustmentInput,
  ctx: CommandContext,
  itemManagementQueries: Pick<ItemManagementQueries, "getItem">,
) {
  const adjustment = await db
    .selectFrom("StockAdjustment")
    .selectAll()
    .where("id", "=", input.id)
    .forUpdate()
    .executeTakeFirst();

  if (!adjustment) {
    return err(new StockAdjustmentNotFoundError(input.id));
  }

  const nextStatus = stockAdjustmentLifecycle.tryTransition(adjustment.status, "submit");
  if (!nextStatus) {
    return err(new InvalidStatusError(input.id));
  }

  const lines = await db
    .selectFrom("StockAdjustmentLine")
    .selectAll()
    .where("stockAdjustmentId", "=", input.id)
    .execute();

  for (const line of lines) {
    const { item } = (await itemManagementQueries.getItem(db, { id: line.itemId }, ctx)).value;
    if (!item) {
      return err(new ItemNotFoundError(line.itemId));
    }
  }

  const stockAdjustment = await db
    .updateTable("StockAdjustment")
    .set({ status: nextStatus })
    .where("id", "=", input.id)
    .returningAll()
    .executeTakeFirstOrThrow();

  return ok({ stockAdjustment });
}