import { describe, expect, it } from "vitest";
import { createElc } from "../src/domain/elc";
import { wireMatrixKeys } from "../src/domain/elcMatrix";

describe("wireMatrixKeys", () => {
  it("assigns row-major pins and diode without mutating source", () => {
    const source = createElc({ source: "test", checksum: "" });
    const next = wireMatrixKeys(
      source,
      ["k1", "k2", "k3"],
      ["MCU.GP0", "MCU.GP1"],
      ["MCU.GP2", "MCU.GP3"],
      "a-to-b",
    );
    expect(next.keys.map((w) => w.detect === "contact" && [w.terminals.a, w.terminals.b, w.diode])).toEqual([
      ["MCU.GP0", "MCU.GP2", "a-to-b"],
      ["MCU.GP0", "MCU.GP3", "a-to-b"],
      ["MCU.GP1", "MCU.GP2", "a-to-b"],
    ]);
    expect(source.keys).toEqual([]);
  });
  it("rejects an undersized matrix", () => {
    expect(() =>
      wireMatrixKeys(createElc({ source: "test", checksum: "" }), ["a", "b"], ["R"], ["C"]),
    ).toThrow();
  });
  it("preserves extension fields when updating existing wiring", () => {
    const source = {
      ...createElc({ source: "test", checksum: "" }),
      keys: [
        {
          key: "k1",
          detect: "contact" as const,
          terminals: { a: "OLD.R", b: "OLD.C" },
          extension: "keep",
        },
      ],
    };
    const next = wireMatrixKeys(source, ["k1"], ["R"], ["C"]);
    expect(next.keys[0]).toMatchObject({ extension: "keep", terminals: { a: "R", b: "C" } });
  });
});