import shutil
import pytest
from amaranth import Elaboratable, Module, Signal
from amaranth.lib.io import Buffer
from groovylight.platforms.colorlight_5a75b_v8_2 import Colorlight_5A75B_R82Platform


def progs_exist(programs) -> bool:
    for p in programs:
        if shutil.which(p) is None:
            return False
    return True

class Blinky(Elaboratable):
    def elaborate(self, platform):
        m = Module()

        m.submodules.led = led = Buffer("o", platform.request("led", dir="-"))
        state = Signal()
        counter = Signal(24)

        with m.If(counter == 0):
            m.d.sync += [counter.eq(~0), state.eq(~state)]
        with m.Else():
            m.d.sync += counter.eq(counter - 1)

        m.d.comb += led.o.eq(state)

        return m


def test_platform():
    if not progs_exist(["yosys", "nextpnr-ecp5", "openFPGALoader"]):
        pytest.skip("missing toolchain programs")
    plat = Colorlight_5A75B_R82Platform()

    plat.build(Blinky())