import { CoverageTracker } from "../src/services/transcription/recovery/coverage/CoverageTracker";

describe("CoverageTracker", () => {
  it("advances hardCommittedMs from final transcript coverage", () => {
    const tracker = new CoverageTracker({
      partialStabilityMinCount: 2,
      partialStabilityMinMs: 600,
    });

    const state = tracker.onTranscriptMessage({
      is_partial: false,
      data: {
        audio_duration: 2.0,
        words: [
          { start: 0.0, end: 1.2 },
          { start: 1.2, end: 1.4 },
        ],
      },
    });

    // finalCoverageMs=min(2000,1400+500)=1900 => hardCommittedMs=1650
    expect(state.updated).toBe(true);
    expect(state.hardCommittedMs).toBe(1650);
  });

  it("advances softCommittedMs only after partial stability", () => {
    const tracker = new CoverageTracker({
      partialStabilityMinCount: 2,
      partialStabilityMinMs: 600,
    });

    const first = tracker.onTranscriptMessage(
      {
        is_partial: true,
        data: {
          text: "Patient reports mild cough",
          audio_duration: 1.5,
          words: [{ start: 0.0, end: 1.0 }],
        },
      },
      1000
    );

    const second = tracker.onTranscriptMessage(
      {
        is_partial: true,
        data: {
          text: "Patient reports mild cough",
          audio_duration: 1.5,
          words: [{ start: 0.0, end: 1.0 }],
        },
      },
      1100
    );

    expect(first.softCommittedMs).toBe(0);
    expect(first.updated).toBe(false);
    // stablePartialCoverageMs=min(1500,1000+250)=1250 => softCommittedMs=750
    expect(second.updated).toBe(true);
    expect(second.softCommittedMs).toBe(750);
  });

  it("keeps commit progression monotonic", () => {
    const tracker = new CoverageTracker({
      partialStabilityMinCount: 2,
      partialStabilityMinMs: 600,
    });

    tracker.onTranscriptMessage({
      is_partial: false,
      data: {
        audio_duration: 3,
        words: [{ start: 0, end: 2 }],
      },
    });

    const regressed = tracker.onTranscriptMessage({
      is_partial: false,
      data: {
        audio_duration: 1,
        words: [{ start: 0, end: 0.5 }],
      },
    });

    expect(regressed.updated).toBe(false);
    expect(regressed.hardCommittedMs).toBeGreaterThan(0);
  });
});