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

// Line-level source document types for inbound shipments.
export const INBOUND_SHIPMENT_LINE_SOURCE_DOCUMENT_TYPES = ["PURCHASE_ORDER"] as const;

// Must match inventory's STOCK_TYPES; duplicated locally to avoid a cross-module value import.
export const STOCK_TYPES = ["AVAILABLE", "BLOCKED", "IN_TRANSIT"] as const;

const builtins = (params: {
  itemType?: TailorAnyDBType;
  unitType?: TailorAnyDBType;
  storageLocationType?: TailorAnyDBType;
}) => {
  const itemId = db.uuid().description("Foreign key to Item");
  const unitId = db.uuid().description("Business/input Unit for quantity");
  const primaryUnitId = db
    .uuid()
    .description("Snapshot of the item's primary Unit at shipment line creation time");
  const storageLocationId = db.uuid().description("Storage location affected by this line");
  return {
    inboundShipmentId: db
      .uuid()
      .relation({
        type: "n-1",
        toward: { type: inboundShipment, as: "inboundShipment" },
        backward: "lines",
      })
      .description("Foreign key to InboundShipment header"),
    itemId: params.itemType
      ? itemId.relation({
          type: "n-1",
          toward: { type: params.itemType, as: "item" },
          backward: "inboundShipmentLines",
        })
      : itemId,
    quantity: db.decimal().description("Business/input quantity in unitId"),
    unitId: params.unitType
      ? unitId.relation({
          type: "n-1",
          toward: { type: params.unitType, as: "unit" },
          backward: "inboundShipmentLines",
        })
      : unitId,
    primaryQuantity: db
      .decimal()
      .description("Quantity converted to the item's primary unit at line creation time"),
    primaryUnitId: params.unitType
      ? primaryUnitId.relation({
          type: "n-1",
          toward: { type: params.unitType, as: "primaryUnit" },
          backward: "primaryInboundShipmentLines",
        })
      : primaryUnitId,
    unitConversionRate: db
      .decimal()
      .description("Multiplier used to convert quantity into primaryQuantity"),
    unitCost: db
      .decimal({ optional: true })
      .description("Primary-unit cost derived from the purchase-order line price at posting"),
    storageLocationId: params.storageLocationType
      ? storageLocationId.relation({
          type: "n-1",
          toward: { type: params.storageLocationType, as: "storageLocation" },
          backward: "inboundShipmentLines",
        })
      : storageLocationId,
    stockType: db
      .enum([...STOCK_TYPES] as [string, ...string[]])
      .description("Stock type affected by this line"),
    sourceDocumentType: db
      .enum(INBOUND_SHIPMENT_LINE_SOURCE_DOCUMENT_TYPES)
      .description("Source document type. Generic reference, not a typed foreign key."),
    sourceDocumentId: db
      .uuid()
      .description("Source document ID. Generic reference, not a typed foreign key."),
    sourceLineId: db
      .uuid()
      .description("Source document line ID. Generic reference, not a typed foreign key."),
  };
};

type ReservedFields = keyof ReturnType<typeof builtins> | CommonReservedFields;

export interface CreateInboundShipmentLineTypeParams<F extends Record<string, TailorAnyDBField>> {
  fields?: NoReservedFields<F, ReservedFields>;
  itemType?: TailorAnyDBType;
  unitType?: TailorAnyDBType;
  storageLocationType?: TailorAnyDBType;
}

export function createInboundShipmentLineType<const F extends Record<string, TailorAnyDBField>>(
  params: CreateInboundShipmentLineTypeParams<F>,
) {
  return db
    .table("InboundShipmentLine", {
      ...builtins(params),
      ...((params.fields ?? {}) as F),
      ...db.fields.timestamps(),
    })
    .indexes({
      fields: ["sourceDocumentType", "sourceDocumentId", "sourceLineId"],
      unique: false,
      name: "inbound_shipment_line_source_idx",
    })
    .permission(defaultPermission)
    .gqlPermission(defaultGqlPermission);
}

export const inboundShipmentLine = createInboundShipmentLineType({});