import { describe, expect, it } from "vitest";
import { trainerWalkBuffer } from "../src/game/scripts/interpreter";
import { readMovement } from "../src/game/scripts/movement";

describe("TrainerWalkToPlayer", () => {
  const decode = (buffer: number[]) => readMovement({ byte: (index) => buffer[index] }, 0);
  it("only pauses when the player is adjacent", () => {
    expect(trainerWalkBuffer({ x: 5, y: 5 }, { x: 5, y: 6 }, 1)).toEqual([0x3e, 0x47]);
    expect(decode([0x3e, 0x47])).toEqual([{ kind: "sleep", ticks: 1 }]);
  });
  it("walks all but the last tile toward the player at normal speed", () => {
    // step DOWN is movement_step | DOWN.
    expect(trainerWalkBuffer({ x: 1, y: 7 }, { x: 1, y: 10 }, 3)).toEqual([0x3e, 0x0c, 0x0c, 0x47]);
    expect(trainerWalkBuffer({ x: 9, y: 4 }, { x: 4, y: 4 }, 5)).toEqual([0x3e, 0x0e, 0x0e, 0x0e, 0x0e, 0x47]);
    expect(trainerWalkBuffer({ x: 2, y: 4 }, { x: 4, y: 4 }, 2)).toEqual([0x3e, 0x0f, 0x47]);
    expect(decode([0x3e, 0x0d, 0x47])).toEqual([
      { kind: "sleep", ticks: 1 },
      { kind: "step", direction: "up", ticks: 8, animate: true },
    ]);
  });
  it("follows ComputePathToWalkToPlayer off a straight line: the shorter axis first", () => {
    expect(trainerWalkBuffer({ x: 0, y: 0 }, { x: 3, y: 1 }, 4)).toEqual([0x3e, 0x0c, 0x0f, 0x0f, 0x47]);
  });
});