import { describe, expect, it } from "vitest";

import {
  getToolcraftSegmentedStaticFitError,
  renderToolcraftSegmentedStaticFitDocumentationSentence,
  TOOLCRAFT_SEGMENTED_STATIC_FIT,
} from "./segmented-control-fit";

const SEGMENTED_STATIC_FIT_ERROR = `segmented controls must preserve cell padding: use at most ${TOOLCRAFT_SEGMENTED_STATIC_FIT.maxOptions} short options (max ${TOOLCRAFT_SEGMENTED_STATIC_FIT.maxOptionLabelLength} characters per label and ${TOOLCRAFT_SEGMENTED_STATIC_FIT.maxTotalLabelLength} total) or shorten labels first; if the compact names still exceed the budget, use a select dropdown instead.`;

describe("Toolcraft segmented static-fit policy", () => {
  it("publishes the canonical immutable limits", () => {
    expect(TOOLCRAFT_SEGMENTED_STATIC_FIT).toEqual({
      maxOptionLabelLength: 9,
      maxOptions: 4,
      maxTotalLabelLength: 24,
    });
    expect(Object.isFrozen(TOOLCRAFT_SEGMENTED_STATIC_FIT)).toBe(true);
  });

  it("renders the canonical policy-derived documentation sentence", () => {
    expect(renderToolcraftSegmentedStaticFitDocumentationSentence()).toBe(
      "Text segmented controls allow at most 4 options, no option label longer than 9 characters, and no more than 24 total option-label characters.",
    );
  });

  it("accepts labels at every static-fit boundary", () => {
    expect(
      getToolcraftSegmentedStaticFitError({
        options: [
          { label: "Ink Drops" },
          { label: "Default" },
          { label: "Solar" },
          { label: "RGB" },
        ],
        type: "segmented",
      }),
    ).toBeNull();
  });

  it.each([
    {
      name: "more than four options",
      options: ["One", "Two", "Three", "Four", "Five"],
    },
    {
      name: "a trimmed label longer than nine characters",
      options: ["  Ten letters  "],
    },
    {
      name: "a trimmed total label length longer than 24 characters",
      options: ["123456789", "123456789", "1234567"],
    },
  ])("rejects $name", ({ options }) => {
    expect(
      getToolcraftSegmentedStaticFitError({
        options: options.map((label) => ({ label })),
        type: "segmented",
      }),
    ).toBe(SEGMENTED_STATIC_FIT_ERROR);
  });

  it("does not apply segmented limits to select controls", () => {
    expect(
      getToolcraftSegmentedStaticFitError({
        options: [{ label: "A label beyond every segmented limit" }],
        type: "select",
      }),
    ).toBeNull();
  });
});