import { ok, err, type CommandContext } from "@tailor-platform/erp-kit/core";
import { workCenterLifecycle } from "../db/workCenter.lifecycle.generated";
import type { Transaction } from "../generated/kysely-tailordb";
import {
  WorkCenterNotFoundError,
  WorkCenterNotDeactivatableError,
  WorkCenterInUseError,
} from "../lib/errors.generated";

export interface DeactivateWorkCenterInput {
  id: string;
}

/**
 * Function: deactivateWorkCenter
 *
 * Removes a work center from future routing and release selection.
 * Preserves historical work-order and cost records while blocking
 * new execution use.
 */
export async function run(db: Transaction, input: DeactivateWorkCenterInput, _ctx: CommandContext) {
  const { id } = input;

  // 1. Fetch work center with lock
  const workCenter = await db
    .selectFrom("WorkCenter")
    .selectAll()
    .where("id", "=", id)
    .forUpdate()
    .executeTakeFirst();

  if (!workCenter) {
    return err(new WorkCenterNotFoundError(id));
  }

  // 2. Validate status is deactivatable
  const nextStatus = workCenterLifecycle.tryTransition(workCenter.status, "deactivate");
  if (!nextStatus) {
    return err(new WorkCenterNotDeactivatableError(workCenter.code));
  }

  // 3. Check for blocking dependencies — active routings that reference this work center
  const activeRoutingDependency = await db
    .selectFrom("RoutingOperation")
    .innerJoin("Routing", "Routing.id", "RoutingOperation.routingId")
    .select("RoutingOperation.id")
    .where("RoutingOperation.workCenterId", "=", id)
    .where("Routing.status", "=", "ACTIVE")
    .executeTakeFirst();

  if (activeRoutingDependency) {
    return err(new WorkCenterInUseError(workCenter.code));
  }

  // 4. Check for open work orders that still reference this work center
  const openWorkOrder = await db
    .selectFrom("WorkOrder")
    .select("WorkOrder.id")
    .where("WorkOrder.workCenterId", "=", id)
    .where("WorkOrder.status", "in", ["PENDING", "IN_PROGRESS", "PAUSED"])
    .executeTakeFirst();

  if (openWorkOrder) {
    return err(new WorkCenterInUseError(workCenter.code));
  }

  // 5. Set status to INACTIVE
  const updatedWorkCenter = await db
    .updateTable("WorkCenter")
    .set({
      status: nextStatus,
    })
    .where("id", "=", id)
    .returningAll()
    .executeTakeFirstOrThrow();

  return ok({ workCenter: updatedWorkCenter });
}