import { describe, expect, it } from "vitest";
import { IoImageRuntime, ioKey } from "../../src/runtime/index.js";
import type { IoReference, PulseInstruction, WaitInstruction } from "../../src/grl/ir/index.js";

const DO1: IoReference = { domain: "do", index: 1, raw: "io.do[1]" };
const DI1: IoReference = { domain: "di", index: 1, raw: "io.di[1]" };
const DI2: IoReference = { domain: "di", index: 2, raw: "io.di[2]" };
const AI1: IoReference = { domain: "ai", index: 1, raw: "io.ai[1]" };

describe("virtual IO image, waits, pulses, edges, and scripts", () => {
  it("enforces write permissions and records IO events", () => {
    const io = new IoImageRuntime({
      permissions: [
        { writer: "program", domains: ["do"], access: "write" },
        { writer: "script", domains: ["di", "ai"], access: "write" }
      ]
    });

    expect(io.write(DO1, true, "program")).toMatchObject({ kind: "write", value: true });
    expect(io.write(DI1, true, "program")).toBeUndefined();
    expect(io.snapshot()).toMatchObject({
      image: { [ioKey(DO1)]: true },
      diagnostics: [expect.objectContaining({ code: "VC_IO_PERMISSION_DENIED" })]
    });
  });

  it("evaluates waits, timeouts, on_timeout hold-stop, and edge conditions", () => {
    const io = new IoImageRuntime({
      permissions: [{ writer: "script", domains: ["di", "ai"], access: "write" }]
    });
    const wait: WaitInstruction = {
      kind: "WAIT",
      condition: "all ( io . di [ 1 ] == true , io . di [ 2 ] == false )",
      timeout: 1,
      onTimeout: { kind: "call", value: "recover" }
    };

    expect(io.evaluateWait(wait, 0)).toMatchObject({ status: "waiting" });
    expect(io.evaluateWait(wait, 1)).toMatchObject({
      status: "hold-stop",
      onTimeout: { kind: "call", value: "recover" },
      diagnostic: { code: "VC_WAIT_TIMEOUT" }
    });

    io.write(DI1, true, "script");
    io.write(DI2, false, "script");
    expect(io.evaluateWait(wait, 0)).toMatchObject({ status: "satisfied" });
    expect(io.matchesCondition("rising ( io . di [ 1 ] )")).toBe(true);
    io.write(DI1, false, "script");
    expect(io.matchesCondition("falling ( io . di [ 1 ] )")).toBe(true);
    io.write(AI1, 5, "script");
    expect(io.matchesCondition("changed ( io . ai [ 1 ] )")).toBe(true);
  });

  it("auto-resets pulses and executes delayed IO scripts", () => {
    const io = new IoImageRuntime({
      permissions: [
        { writer: "program", domains: ["do"], access: "write" },
        { writer: "script", domains: ["di"], access: "write" }
      ]
    });
    const pulse: PulseInstruction = {
      kind: "PULSE",
      target: DO1,
      duration: 0.2,
      trace: [
        { time: 0, action: "set", target: DO1, value: true },
        { time: 0.2, action: "reset", target: DO1, value: false }
      ]
    };

    io.executePulse(pulse);
    expect(io.read(DO1)).toBe(true);
    io.advance(0.2);
    expect(io.read(DO1)).toBe(false);

    io.addScript("part-arrival", [{ delay: 0.5, target: DI1, value: true }]);
    io.advance(0.49);
    expect(io.read(DI1)).toBeUndefined();
    io.advance(0.01);
    expect(io.read(DI1)).toBe(true);
    expect(io.snapshot().events.map((event) => event.kind)).toEqual([
      "pulse_set",
      "pulse_reset",
      "script"
    ]);
  });
});