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import { describe, expect, test } from "bun:test";
import {
getClipTimeAtSourceTime,
getEffectiveRateAt,
getSourceTimeAtClipTime,
getTimelineDurationForSourceSpan,
} from "@/retime";
import type { RetimeConfig } from "@/timeline";
const twoX: RetimeConfig = { rate: 2 };
const halfX: RetimeConfig = { rate: 0.5 };
describe("retime resolve", () => {
test("maps clip time to source time at 2x speed", () => {
expect(getSourceTimeAtClipTime({ clipTime: 5, retime: twoX })).toBe(10);
});
test("maps clip time to source time at 0.5x speed", () => {
expect(getSourceTimeAtClipTime({ clipTime: 4, retime: halfX })).toBe(2);
});
test("returns clip time unchanged when no retime", () => {
expect(getSourceTimeAtClipTime({ clipTime: 7 })).toBe(7);
});
test("inverts source time back to clip time at 2x speed", () => {
expect(getClipTimeAtSourceTime({ sourceTime: 10, retime: twoX })).toBe(5);
});
test("returns effective rate", () => {
expect(getEffectiveRateAt({ retime: twoX })).toBe(2);
expect(getEffectiveRateAt({})).toBe(1);
});
test("derives timeline duration for a visible source span", () => {
expect(
getTimelineDurationForSourceSpan({ sourceSpan: 10, retime: twoX }),
).toBe(5);
expect(
getTimelineDurationForSourceSpan({ sourceSpan: 10, retime: halfX }),
).toBe(20);
});
test("clamps invalid rates to 1", () => {
expect(getSourceTimeAtClipTime({ clipTime: 5, retime: { rate: 0 } })).toBe(
5,
);
expect(
getSourceTimeAtClipTime({ clipTime: 5, retime: { rate: -1 } }),
).toBe(5);
});
test("caps retime rates above 5x", () => {
expect(getSourceTimeAtClipTime({ clipTime: 5, retime: { rate: 100 } })).toBe(
25,
);
expect(
getTimelineDurationForSourceSpan({ sourceSpan: 10, retime: { rate: 100 } }),
).toBe(2);
});
});
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