# Copyright 2024 Max Planck Institute for Software Systems, and
# National University of Singapore
#
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from simbricks.orchestration.system import base
from simbricks.orchestration.utils import base as utils_base


class PCIeHostInterface(base.Interface):
    # Note AK: Component here is on purpose. Other simulators than host
    # simulators can also have PCIeHost interfaces (e.g. a PCIe switch)
    def __init__(self, c: base.Component) -> None:
        super().__init__(c)


class PCIeDeviceInterface(base.Interface):
    def __init__(self, c: base.Component) -> None:
        super().__init__(c)

    def connect(self, c: base.Channel) -> None:
        # Note AK: a bit ugly, but I think we can't get around a rt check here
        utils_base.has_expected_type(c, PCIeChannel)
        super().connect(c)


class PCIeChannel(base.Channel):
    def __init__(self, host: PCIeHostInterface, dev: PCIeDeviceInterface) -> None:
        super().__init__(host, dev)

    def host_if(self) -> PCIeHostInterface:
        return self.a

    def dev_if(self) -> PCIeDeviceInterface:
        return self.b


# Note AK: Can we make this abstract?
class PCIeSimpleDevice(base.Component):
    def __init__(self, s: base.System):
        super().__init__(s)
        self._pci_if: PCIeDeviceInterface = PCIeDeviceInterface(self)

    def interfaces(self) -> list[base.Interface]:
        return [self._pci_if]

    def add_if(self, interface: PCIeDeviceInterface) -> None:
        raise Exception("PCIeSimpleDevice already has PCI device interface")

    def toJSON(self) -> dict:
        json_obj = super().toJSON()
        json_obj["pci_if"] = self._pci_if.id()
        return json_obj
    
    @staticmethod
    def fromJSON(json_obj):
        # TODO
        pass