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import { describe, expect, it } from "vitest";
import { type DragPhase, type DragTransition, nextDragPhase } from "./drag-controller";
const OPTS = { dragThresholdPx: 6 };
function down(over: Partial<Parameters<typeof nextDragPhase>[1] & { type: "pointer-down" }> = {}) {
return {
type: "pointer-down" as const,
id: "t1",
x: 10,
y: 10,
touch: false,
...over,
};
}
function press(touch = false): DragPhase {
return nextDragPhase({ kind: "idle" }, down({ touch }), OPTS).phase;
}
describe("nextDragPhase — mouse", () => {
it("a pointer-down enters the undecided pressing state", () => {
expect(press()).toEqual({ kind: "pressing", id: "t1", x: 10, y: 10, touch: false });
});
it("movement past the threshold starts a drag", () => {
const transition = nextDragPhase(
press(),
{ type: "pointer-move", x: 20, y: 12, targetCell: { col: 4, row: 1 } },
OPTS,
);
expect(transition.phase).toEqual({
kind: "dragging",
id: "t1",
x: 20,
y: 12,
targetCell: { col: 4, row: 1 },
touch: false,
});
expect(transition.emit).toBeUndefined();
});
it("movement within the threshold stays pressing", () => {
const transition = nextDragPhase(
press(),
{ type: "pointer-move", x: 12, y: 14, targetCell: { col: 1, row: 1 } },
OPTS,
);
expect(transition.phase).toEqual({ kind: "pressing", id: "t1", x: 10, y: 10, touch: false });
});
it("release without moving emits a tap (open the workspace)", () => {
const transition = nextDragPhase(press(), { type: "pointer-up" }, OPTS);
expect(transition.phase).toEqual({ kind: "idle" });
expect(transition.emit).toEqual({ kind: "tap", id: "t1" });
});
it("release while dragging emits a drop with the last tracked index", () => {
let transition: DragTransition = nextDragPhase(
press(),
{ type: "pointer-move", x: 30, y: 30, targetCell: { col: 3, row: 1 } },
OPTS,
);
transition = nextDragPhase(
transition.phase,
{ type: "pointer-move", x: 31, y: 31, targetCell: { col: 6, row: 1 } },
OPTS,
);
transition = nextDragPhase(transition.phase, { type: "pointer-up" }, OPTS);
expect(transition.emit).toEqual({ kind: "drop", id: "t1", targetCell: { col: 6, row: 1 } });
expect(transition.phase).toEqual({ kind: "idle" });
});
});
describe("nextDragPhase — touch", () => {
it("a long-press lifts the tile and emits lift (arm the drag + select)", () => {
const transition = nextDragPhase(press(true), { type: "long-press" }, OPTS);
expect(transition.emit).toEqual({ kind: "lift", id: "t1" });
expect(transition.phase).toEqual({
kind: "dragging",
id: "t1",
x: 10,
y: 10,
targetCell: null,
touch: true,
});
});
it("movement past the threshold BEFORE the lift cancels (vertical scrolling wins)", () => {
const transition = nextDragPhase(
press(true),
{ type: "pointer-move", x: 10, y: 80, targetCell: { col: 1, row: 1 } },
OPTS,
);
expect(transition.phase).toEqual({ kind: "idle" });
expect(transition.emit).toBeUndefined();
});
it("movement within the threshold before the lift keeps pressing", () => {
const transition = nextDragPhase(
press(true),
{ type: "pointer-move", x: 13, y: 12, targetCell: { col: 1, row: 1 } },
OPTS,
);
expect(transition.phase?.kind).toBe("pressing");
});
it("after the lift, movement drags (never cancels)", () => {
let transition = nextDragPhase(press(true), { type: "long-press" }, OPTS);
transition = nextDragPhase(
transition.phase,
{ type: "pointer-move", x: 10, y: 90, targetCell: { col: 5, row: 1 } },
OPTS,
);
expect(transition.phase).toEqual({
kind: "dragging",
id: "t1",
x: 10,
y: 90,
targetCell: { col: 5, row: 1 },
touch: true,
});
});
it("a long-press never lifts a mouse press (desktop selects via right-click)", () => {
const transition = nextDragPhase(press(false), { type: "long-press" }, OPTS);
expect(transition.emit).toBeUndefined();
expect(transition.phase?.kind).toBe("pressing");
});
it("release while lifted (no movement) drops at the lifted tile's own slot", () => {
let transition = nextDragPhase(press(true), { type: "long-press" }, OPTS);
transition = nextDragPhase(transition.phase, { type: "pointer-up" }, OPTS);
expect(transition.emit).toEqual({ kind: "drop", id: "t1", targetCell: null });
});
});
describe("nextDragPhase — cancellations", () => {
it("cancel returns to idle from any phase without emitting", () => {
for (const phase of [
{ kind: "idle" as const },
press(),
nextDragPhase(
press(),
{ type: "pointer-move", x: 40, y: 40, targetCell: { col: 2, row: 1 } },
OPTS,
).phase,
]) {
const transition = nextDragPhase(phase, { type: "cancel" }, OPTS);
expect(transition.phase).toEqual({ kind: "idle" });
expect(transition.emit).toBeUndefined();
}
});
it("events in idle are inert", () => {
expect(nextDragPhase({ kind: "idle" }, { type: "pointer-up" }, OPTS).phase).toEqual({
kind: "idle",
});
expect(
nextDragPhase(
{ kind: "idle" },
{ type: "pointer-move", x: 1, y: 1, targetCell: { col: 1, row: 1 } },
OPTS,
).phase,
).toEqual({ kind: "idle" });
expect(nextDragPhase({ kind: "idle" }, { type: "long-press" }, OPTS).phase).toEqual({
kind: "idle",
});
});
it("a second pointer-down restarts the gesture with the new tile", () => {
const dragging = nextDragPhase(
press(),
{ type: "pointer-move", x: 40, y: 40, targetCell: { col: 2, row: 1 } },
OPTS,
).phase;
const transition = nextDragPhase(dragging, down({ id: "t2" }), OPTS);
expect(transition.phase).toEqual({ kind: "pressing", id: "t2", x: 10, y: 10, touch: false });
});
});
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