import { defaultGqlPermission, defaultPermission } from "@tailor-platform/erp-kit/core";
import { db, type TailorAnyDBType } from "@tailor-platform/sdk";

const builtins = (params: { itemType?: TailorAnyDBType }) => {
  const itemId = db.uuid().description("Foreign key to Item");
  return {
    itemId: params.itemType
      ? itemId.relation({
          type: "n-1",
          toward: { type: params.itemType, as: "item" },
          backward: "standardCosts",
        })
      : itemId,
    version: db.int().description("1-based generation number within the item"),
    unitCost: db.decimal().description("Standard cost per unit, stored unrounded"),
  };
};

export function createStandardCostType(params: { itemType?: TailorAnyDBType }) {
  return db
    .table("StandardCost", {
      ...builtins(params),
      createdAt: db.fields.timestamps().createdAt,
    })
    .indexes({
      fields: ["itemId", "version"],
      unique: true,
      name: "standard_cost_item_version_unique_idx",
    })
    .permission(defaultPermission)
    .gqlPermission(defaultGqlPermission);
}

export const standardCost = createStandardCostType({});