import assert from "node:assert/strict";
import { describe, it } from "node:test";
import {
  buildCircuitDeviceRowMoveAssignments,
} from "../src/frontend/utils/circuit-device-row-move-command.js";
import type {
  CircuitTreeCircuitDto,
  CircuitTreeDeviceRowDto,
} from "../src/frontend/types.js";

function row(
  id: string,
  sortOrder: number
): CircuitTreeDeviceRowDto {
  return {
    id,
    sortOrder,
    name: id,
    displayName: id,
    quantity: 1,
    powerPerUnit: 0.1,
    simultaneityFactor: 1,
    rowTotalPower: 0.1,
  };
}

function circuit(
  id: string,
  deviceRows: CircuitTreeDeviceRowDto[]
): CircuitTreeCircuitDto {
  return {
    id,
    circuitListId: "list-1",
    sectionId: "section-1",
    equipmentIdentifier: id,
    sortOrder: 10,
    isReserve: deviceRows.length === 0,
    circuitTotalPower: 0,
    deviceRows,
  };
}

describe("circuit device-row move command builder", () => {
  it("records exact sources and appends rows in selection order", () => {
    const targetRows = [row("target-row", 20)];
    const circuits = [
      circuit("source-1", [row("row-1", 30)]),
      circuit("source-2", [row("row-2", 10)]),
      circuit("target", targetRows),
    ];

    assert.deepEqual(
      buildCircuitDeviceRowMoveAssignments({
        circuits,
        rowIds: ["row-2", "row-1"],
        targetCircuitId: "target",
        targetDeviceRows: targetRows,
      }),
      [
        {
          rowId: "row-2",
          expectedCircuitId: "source-2",
          expectedSortOrder: 10,
          targetCircuitId: "target",
          targetSortOrder: 30,
        },
        {
          rowId: "row-1",
          expectedCircuitId: "source-1",
          expectedSortOrder: 30,
          targetCircuitId: "target",
          targetSortOrder: 40,
        },
      ]
    );
  });

  it("starts a generated target circuit at sort order ten", () => {
    assert.deepEqual(
      buildCircuitDeviceRowMoveAssignments({
        circuits: [circuit("source", [row("row-1", 40)])],
        rowIds: ["row-1"],
        targetCircuitId: "generated-target",
        targetDeviceRows: [],
      }),
      [
        {
          rowId: "row-1",
          expectedCircuitId: "source",
          expectedSortOrder: 40,
          targetCircuitId: "generated-target",
          targetSortOrder: 10,
        },
      ]
    );
  });

  it("omits unchanged assignments during a same-circuit reorder", () => {
    const rows = [row("row-1", 10), row("row-2", 20)];
    assert.deepEqual(
      buildCircuitDeviceRowMoveAssignments({
        circuits: [circuit("target", rows)],
        rowIds: ["row-1", "row-2"],
        targetCircuitId: "target",
        targetDeviceRows: rows,
      }),
      []
    );
  });

  it("rejects duplicate or missing selected rows", () => {
    const circuits = [circuit("source", [row("row-1", 10)])];
    assert.throws(
      () =>
        buildCircuitDeviceRowMoveAssignments({
          circuits,
          rowIds: ["row-1", "row-1"],
          targetCircuitId: "target",
          targetDeviceRows: [],
        }),
      /mehrfach/
    );
    assert.throws(
      () =>
        buildCircuitDeviceRowMoveAssignments({
          circuits,
          rowIds: ["missing"],
          targetCircuitId: "target",
          targetDeviceRows: [],
        }),
      /nicht gefunden/
    );
  });
});