from TractorLoad import TillageUnit


def changeFieldState(field, tractor):
    if tractor.header and tractor.hitch == "Crop Trailer" and field.state == "toCut":
        return "toPlow"

    elif isinstance(tractor.hitch, TillageUnit) and tractor.hitch.load == "Nothing" and field.state == "toPlow":
        return "toWater"

    elif isinstance(tractor.hitch, TillageUnit) and tractor.hitch.load == "Water" and field.state == "toWater":
        return "toSeed"

    elif isinstance(tractor.hitch, TillageUnit) and tractor.hitch.load == "Seeds" and field.state == "toSeed":
        return "toFertilize"

    elif isinstance(tractor.hitch, TillageUnit) and tractor.hitch.load == "Fertilizer" and field.state == "toFertilize":
        return "toCut"


def autoToolsChange(tractor, tillageUnit, toolCounter):
    if tractor.horizontal_index == 0 and tractor.vertical_index == 0:
        toolCounter = (toolCounter + 1) % 5
        tractor, tillageUnit = chooseToolset(tractor, tillageUnit, toolCounter)
        tractor.fill_tank()
    return tractor, tillageUnit, toolCounter

def chooseToolset(tractor, tillageUnit, set):
    if set == 0:
        tractor.hitch = tillageUnit
        tractor.hitch.load = "Nothing"
    if set == 1:
        tractor.hitch = tillageUnit
        tractor.hitch.load = "Water"
    if set == 2:
        tractor.hitch = tillageUnit
        tractor.hitch.load = "Seeds"
    if set == 3:
        tractor.hitch = tillageUnit
        tractor.hitch.load = "Fertilizer"
    if set == 4:
        tractor.header = True
        tractor.hitch = "Crop Trailer"

    return tractor, tillageUnit