Recorder-Tabber/tests/converter.test.ts

import { describe, expect, it } from "vitest";
import { fingeringCode, fingeringFor, fingeringMarks, CHART_NOTES } from "@/lib/fingering";
import { DURATION_PRESETS } from "@/lib/duration";
import {
  cloneLine,
  createNote,
  dropIndexFromPoint,
  insertNote,
  LINE_EXAMPLES,
  moveNote,
  removeNote,
  setDuration,
} from "@/lib/line";
import { parsePitch } from "@/lib/pitch";
import { extraBeatArrows } from "@/lib/score";

const BAROQUE: Record<string, string> = {
  C5: "0 1 2 3 4 5 6a 6b 7a 7b",
  "C#5": "0 1 2 3 4 5 6a 6b 7a",
  D5: "0 1 2 3 4 5 6a 6b",
  Eb5: "0 1 2 3 4 5 6a",
  E5: "0 1 2 3 4 5",
  F5: "0 1 2 3 4 6a 6b 7a 7b",
  "F#5": "0 1 2 3 5 6a 6b",
  G5: "0 1 2 3",
  Ab5: "0 1 2 4 5 6a",
  A5: "0 1 2",
  Bb5: "0 1 3 4",
  B5: "0 1",
  C6: "0 2",
  "C#6": "- 1 2",
  D6: "- 2",
  Eb6: "- 2 3 4 5 6a 6b",
  E6: "x 1 2 3 4 5",
  F6: "x 1 2 3 4 6a 6b",
  "F#6": "x 1 2 3 5",
  G6: "x 1 2 3",
  Ab6: "x 1 2 4",
  A6: "x 1 2",
  Bb6: "x 1 2 5 6a 6b",
  B6: "x 1 2 4 5",
  C7: "x 1 4 5",
  "C#7": "x 1 3 4 6a 6b bell",
  D7: "x 1 3 4 6a 6b",
};

describe("soprano chart", () => {
  it("covers every semitone from C5 through D7 and no others", () => {
    const midis = CHART_NOTES.map((note) => parsePitch(note)?.midi);
    expect(midis).toEqual(Array.from({ length: 27 }, (_, index) => 72 + index));
  });

  it("matches the Dolmetsch first-choice Baroque rows", () => {
    for (const [note, code] of Object.entries(BAROQUE)) {
      const fingering = fingeringFor(note, "baroque");
      expect(fingering, note).not.toBeNull();
      expect(fingeringCode(fingering!), note).toBe(code);
    }
  });

  it("marks fork, half-holes, pinch, and bell without guessing outside the range", () => {
    expect(fingeringMarks(fingeringFor("F5", "baroque")!)).toContain("fork");
    expect(fingeringMarks(fingeringFor("Eb5", "baroque")!)).toContain("half 6");
    expect(fingeringMarks(fingeringFor("C#5", "baroque")!)).toContain("half 7");
    expect(fingeringMarks(fingeringFor("E6", "baroque")!)).toContain("pinch");
    expect(fingeringMarks(fingeringFor("C#7", "baroque")!)).toContain("cover bell");
    expect(fingeringFor("B4", "baroque")).toBeNull();
    expect(fingeringFor("E7", "baroque")).toBeNull();
    expect(fingeringCode(fingeringFor("Db5", "baroque")!)).toBe(BAROQUE["C#5"]);
  });

  it("keeps the cited German changes beside the Baroque chart", () => {
    expect(fingeringCode(fingeringFor("F5", "german")!)).toBe("0 1 2 3 4");
    expect(fingeringCode(fingeringFor("F#5", "german")!)).toBe("0 1 2 3 5 6a 6b 7a");
    expect(fingeringCode(fingeringFor("Bb5", "german")!)).toBe("0 1 3 4 6a 6b");
    expect(fingeringCode(fingeringFor("F6", "german")!)).toBe("x 1 2 3 4");
    expect(fingeringCode(fingeringFor("G5", "german")!)).toBe(fingeringCode(fingeringFor("G5", "baroque")!));
    expect(fingeringCode(fingeringFor("E6", "german")!)).toBe(fingeringCode(fingeringFor("E6", "baroque")!));
  });
});

describe("fingering line", () => {
  const quarter = DURATION_PRESETS.find((preset) => preset.label === "quarter")!;
  const half = DURATION_PRESETS.find((preset) => preset.label === "half")!;

  it("inserts, reorders, removes, and changes duration without touching other notes", () => {
    const c = createNote("C5", quarter, "c");
    const e = createNote("E5", quarter, "e");
    const g = createNote("G5", quarter, "g");
    const inserted = insertNote(insertNote([c], 1, g), 1, e);
    expect(inserted.map((note) => note.pitch)).toEqual(["C5", "E5", "G5"]);
    expect(moveNote(inserted, "c", 3).map((note) => note.pitch)).toEqual(["E5", "G5", "C5"]);
    expect(moveNote(inserted, "g", 0).map((note) => note.pitch)).toEqual(["G5", "C5", "E5"]);
    expect(moveNote(inserted, "e", 1).map((note) => note.id)).toEqual(["c", "e", "g"]);
    const held = setDuration(inserted, "e", half);
    expect(held.find((note) => note.id === "e")).toMatchObject({ quarters: 2, label: "half" });
    expect(held.find((note) => note.id === "c")?.quarters).toBe(1);
    expect(removeNote(held, "e").map((note) => note.pitch)).toEqual(["C5", "G5"]);
  });

  it("places a drop before the note whose center is to the right of the pointer", () => {
    const line = { left: 0, right: 400, top: 0, bottom: 200 };
    expect(dropIndexFromPoint(20, 40, line, [50, 150, 250])).toBe(0);
    expect(dropIndexFromPoint(80, 40, line, [50, 150, 250])).toBe(1);
    expect(dropIndexFromPoint(300, 40, line, [50, 150, 250])).toBe(3);
    expect(dropIndexFromPoint(20, 400, line, [50])).toBe(-1);
    expect(dropIndexFromPoint(10, 10, line, [])).toBe(0);
  });

  it("offers two short editable examples and an empty start", () => {
    expect(LINE_EXAMPLES).toHaveLength(2);
    for (const example of LINE_EXAMPLES) {
      expect(example.notes.length).toBeGreaterThan(0);
      expect(example.notes.length).toBeLessThanOrEqual(8);
      for (const note of example.notes) {
        expect(fingeringFor(note.pitch, "baroque")).not.toBeNull();
      }
    }
    const copy = cloneLine([...LINE_EXAMPLES[0].notes]);
    expect(copy.map((note) => note.pitch)).toEqual(LINE_EXAMPLES[0].notes.map((note) => note.pitch));
    expect(copy[0].id).not.toBe(LINE_EXAMPLES[0].notes[0].id);
    expect(extraBeatArrows(LINE_EXAMPLES[0].notes[6].quarters, { beats: 4, beatType: 4 })).toBe(1);
    expect(extraBeatArrows(LINE_EXAMPLES[1].notes[0].quarters, { beats: 4, beatType: 4 })).toBe(0);
  });
});