// @vitest-environment jsdom
import { describe, it, expect } from "vitest";
import { act, renderHook } from "@testing-library/react";
import { useRowSelection } from "./useRowSelection";

const ABCDE = ["a", "b", "c", "d", "e"];

function setup(shown = ABCDE, all = ABCDE, scope: unknown = 1) {
  return renderHook(
    (p: { all: string[]; shown: string[]; scope: unknown }) =>
      useRowSelection(p.all, p.shown, p.scope),
    { initialProps: { all, shown, scope } },
  );
}

describe("useRowSelection", () => {
  it("toggles one row at a time, and says the selected rows in the order shown", () => {
    const { result } = setup();
    act(() => result.current.toggle("d"));
    act(() => result.current.toggle("b"));
    expect(result.current.shownSelected).toEqual(["b", "d"]);
    act(() => result.current.toggle("d"));
    expect(result.current.shownSelected).toEqual(["b"]);
    expect(result.current.isSelected("b")).toBe(true);
    expect(result.current.isSelected("d")).toBe(false);
  });

  it("selects the range from the last row toggled, in either direction", () => {
    const { result } = setup();
    act(() => result.current.toggle("b"));
    act(() => result.current.toggle("d", true));
    expect(result.current.shownSelected).toEqual(["b", "c", "d"]);
    act(() => {
      result.current.clear();
    });
    act(() => result.current.toggle("d"));
    act(() => result.current.toggle("b", true));
    expect(result.current.shownSelected).toEqual(["b", "c", "d"]);
  });

  it("takes a range's state from the row the range ends on: it can clear rows too", () => {
    const { result } = setup();
    act(() => result.current.toggle("a"));
    act(() => result.current.toggle("e", true));
    expect(result.current.shownSelected).toEqual(ABCDE);
    // `e` is selected, so a range ending on it clears; the anchor moved to `e` with the last click.
    act(() => result.current.toggle("b", true));
    expect(result.current.shownSelected).toEqual(["a"]);
  });

  it("leaves rows outside the range alone", () => {
    const { result } = setup();
    act(() => result.current.toggle("a"));
    act(() => result.current.toggle("c"));
    act(() => result.current.toggle("e", true));
    expect(result.current.shownSelected).toEqual(["a", "c", "d", "e"]);
  });

  it("follows the order on screen, not the stored one", () => {
    const { result } = setup(["e", "c", "a", "b", "d"]);
    act(() => result.current.toggle("c"));
    act(() => result.current.toggle("b", true));
    expect(result.current.shownSelected).toEqual(["c", "a", "b"]);
  });

  it("makes a range with no row to start from a plain toggle", () => {
    const { result } = setup();
    act(() => result.current.toggle("c", true));
    expect(result.current.shownSelected).toEqual(["c"]);
  });

  it("makes a range whose first row a filter hid a plain toggle", () => {
    const { result, rerender } = setup();
    act(() => result.current.toggle("a"));
    rerender({ all: ABCDE, shown: ["c", "d", "e"], scope: 1 });
    act(() => result.current.toggle("e", true));
    expect(result.current.shownSelected).toEqual(["e"]);
  });

  it("has the header box cover the rows shown, and keep what a filter hides", () => {
    const { result, rerender } = setup();
    expect(result.current.headerState).toBe("none");
    act(() => result.current.toggle("a"));
    expect(result.current.headerState).toBe("some");
    rerender({ all: ABCDE, shown: ["c", "d"], scope: 1 });
    // The one selected row is hidden: nothing SHOWN is selected, and acting counts what is shown.
    expect(result.current.headerState).toBe("none");
    expect(result.current.shownSelected).toEqual([]);
    act(() => result.current.toggleAllShown());
    expect(result.current.headerState).toBe("all");
    expect(result.current.shownSelected).toEqual(["c", "d"]);
    act(() => result.current.toggleAllShown());
    expect(result.current.headerState).toBe("none");
    rerender({ all: ABCDE, shown: ABCDE, scope: 1 });
    expect(result.current.shownSelected).toEqual(["a"]);
  });

  it("selects every row shown from a partial selection", () => {
    const { result } = setup();
    act(() => result.current.toggle("b"));
    act(() => result.current.toggleAllShown());
    expect(result.current.shownSelected).toEqual(ABCDE);
  });

  it("has no header state to show over no rows", () => {
    const { result } = setup([], []);
    expect(result.current.headerState).toBe("none");
    act(() => result.current.toggleAllShown());
    expect(result.current.headerState).toBe("none");
  });

  it("drops a row that left the list, so it does not come back selected", () => {
    const { result, rerender } = setup();
    act(() => result.current.toggle("b"));
    act(() => result.current.toggle("c"));
    rerender({ all: ["a", "c", "d", "e"], shown: ["a", "c", "d", "e"], scope: 1 });
    expect(result.current.shownSelected).toEqual(["c"]);
    rerender({ all: ABCDE, shown: ABCDE, scope: 1 });
    expect(result.current.shownSelected).toEqual(["c"]);
  });

  it("clears on a change of scope, in the render that changes it", () => {
    const { result, rerender } = setup();
    act(() => result.current.toggle("a"));
    // The same videos in another list are not selected there.
    rerender({ all: ABCDE, shown: ABCDE, scope: 2 });
    expect(result.current.shownSelected).toEqual([]);
    act(() => result.current.toggle("c", true));
    expect(result.current.shownSelected).toEqual(["c"]);
  });

  it("counts the selected rows a filter hides", () => {
    const { result, rerender } = setup();
    act(() => result.current.toggle("a"));
    act(() => result.current.toggle("c"));
    expect(result.current.hiddenCount).toBe(0);
    rerender({ all: ABCDE, shown: ["c", "d"], scope: 1 });
    expect(result.current.hiddenCount).toBe(1);
  });

  it("ticks rows again on top of what is selected by then", () => {
    const { result } = setup();
    act(() => result.current.toggle("e"));
    act(() => result.current.select(["a", "b"]));
    expect(result.current.shownSelected).toEqual(["a", "b", "e"]);
  });

  it("says whether clearing did anything", () => {
    const { result } = setup();
    let cleared = true;
    act(() => {
      cleared = result.current.clear();
    });
    expect(cleared).toBe(false);
    act(() => result.current.toggle("a"));
    act(() => {
      cleared = result.current.clear();
    });
    expect(cleared).toBe(true);
    expect(result.current.shownSelected).toEqual([]);
  });

  it("counts a selected row a filter hides as something to clear", () => {
    const { result, rerender } = setup();
    act(() => result.current.toggle("a"));
    rerender({ all: ABCDE, shown: ["c"], scope: 1 });
    let cleared = false;
    act(() => {
      cleared = result.current.clear();
    });
    expect(cleared).toBe(true);
    rerender({ all: ABCDE, shown: ABCDE, scope: 1 });
    expect(result.current.shownSelected).toEqual([]);
  });
});