import type {
  CircuitSectionReorderAssignment,
} from "../../domain/models/circuit-section-reorder-project-command.model.js";
import type { CircuitTreeCircuitDto } from "../types.js";

export function buildCircuitSectionReorderAssignments(
  circuits: CircuitTreeCircuitDto[],
  orderedCircuitIds: string[]
): CircuitSectionReorderAssignment[] {
  if (
    circuits.length !== orderedCircuitIds.length ||
    new Set(orderedCircuitIds).size !== orderedCircuitIds.length
  ) {
    throw new Error(
      "Die Reihenfolge muss jeden Stromkreis des Bereichs genau einmal enthalten."
    );
  }

  const circuitsById = new Map(
    circuits.map((circuit) => [circuit.id, circuit])
  );
  const assignments = orderedCircuitIds.map((circuitId, index) => {
    const circuit = circuitsById.get(circuitId);
    if (!circuit) {
      throw new Error(
        "Die Reihenfolge enthält einen ungültigen Stromkreis."
      );
    }
    return {
      circuitId,
      expectedSortOrder: circuit.sortOrder,
      targetSortOrder: (index + 1) * 10,
    };
  });
  if (
    assignments.every(
      (assignment) =>
        assignment.expectedSortOrder === assignment.targetSortOrder
    )
  ) {
    return [];
  }
  return assignments;
}