import { ok, err, type CommandContext } from "@tailor-platform/erp-kit/core";
import { routingLifecycle } from "../db/routing.lifecycle.generated";
import type { Transaction } from "../generated/kysely-tailordb";
import {
  RoutingNotFoundError,
  RoutingNotDeactivatableError,
  ReplacementRequiredError,
} from "../lib/errors.generated";

export interface DeactivateRoutingInput {
  id: string;
}

/**
 * Function: deactivateRouting
 *
 * Removes an active routing from future production-order selection.
 * Released production orders keep their frozen operation plan.
 */
export async function run(db: Transaction, input: DeactivateRoutingInput, _ctx: CommandContext) {
  const { id } = input;

  // 1. Fetch routing
  const routing = await db
    .selectFrom("Routing")
    .selectAll()
    .where("id", "=", id)
    .forUpdate()
    .executeTakeFirst();

  if (!routing) {
    return err(new RoutingNotFoundError(id));
  }

  // 2. Verify allowed source status
  const nextStatus = routingLifecycle.tryTransition(routing.status, "deactivate");
  if (!nextStatus) {
    return err(new RoutingNotDeactivatableError(id));
  }

  // 3. Replacement policy: check if another active routing exists for same item+company
  const replacement = await db
    .selectFrom("Routing")
    .selectAll()
    .where("parentItemId", "=", routing.parentItemId)
    .where("companyId", "=", routing.companyId)
    .where("status", "=", "ACTIVE")
    .where("id", "!=", id)
    .executeTakeFirst();

  if (!replacement) {
    // Check if any production orders reference this routing in released/in-progress state
    const dependentOrder = await db
      .selectFrom("ProductionOrder")
      .selectAll()
      .where("selectedRoutingRevisionId", "=", id)
      .where("status", "in", ["RELEASED", "IN_PROGRESS"])
      .executeTakeFirst();

    if (dependentOrder) {
      return err(new ReplacementRequiredError(id));
    }
  }

  // 4. Set status to INACTIVE
  const updatedRouting = await db
    .updateTable("Routing")
    .set({
      status: nextStatus,
    })
    .where("id", "=", id)
    .returningAll()
    .executeTakeFirstOrThrow();

  return ok({ routing: updatedRouting });
}