from Main import TractorLoad
from Main.TractorLoad import TillageUnit


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

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

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

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

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