import pytest
import torch
import torch.nn as nn

from colossalai._analyzer.fx.graph_module import ColoGraphModule
from colossalai._analyzer.fx.passes.shape_prop import shape_prop_pass
from colossalai._analyzer.fx.tracer.tracer import ColoTracer
from colossalai.auto_parallel.tensor_shard.node_handler import ViewHandler
from colossalai.auto_parallel.tensor_shard.node_handler.conv_handler import ConvFunctionHandler
from colossalai.auto_parallel.tensor_shard.node_handler.linear_handler import LinearFunctionHandler
from colossalai.auto_parallel.tensor_shard.sharding_strategy import OperationData, OperationDataType, StrategiesVector
from colossalai.device.device_mesh import DeviceMesh
from colossalai.initialize import launch
from colossalai.logging import disable_existing_loggers
from colossalai.testing import parameterize, rerun_if_address_is_in_use, spawn
from colossalai.testing.pytest_wrapper import run_on_environment_flag
from tests.test_auto_parallel.test_tensor_shard.test_node_handler.utils import numerical_test_for_node_strategy


class ConvViewModel(nn.Module):
    def __init__(self, tgt_shape):
        super().__init__()
        self.tgt_shape = tgt_shape

    def forward(self, input, other):
        conv_node = nn.functional.conv2d(input, other, bias=None)
        reshape_node = conv_node.view(*self.tgt_shape)
        return reshape_node


class LinearViewModel(nn.Module):
    def __init__(self, tgt_shape):
        super().__init__()
        self.tgt_shape = tgt_shape

    def forward(self, input, other):
        linear_node = nn.functional.linear(input, other, bias=None)
        reshape_node = linear_node.view(*self.tgt_shape)
        return reshape_node


def check_view_handler(rank, tgt_shape, model_cls, world_size, port):
    disable_existing_loggers()
    launch(config={}, rank=rank, world_size=world_size, host="localhost", port=port, backend="nccl")
    model = model_cls(tgt_shape).cuda()

    if model_cls.__name__ == "ConvViewModel":
        input = torch.rand(8, 8, 66, 66).to("cuda")
        other = torch.rand(16, 8, 3, 3).to("cuda")
        # index of conv node in computation graph
        node_index = 2
        # total number of conv strategies
        strategy_number = 16
    if model_cls.__name__ == "LinearViewModel":
        input = torch.rand(8, 16, 64, 32).to("cuda")
        other = torch.rand(64, 32).to("cuda")
        # index of linear node in computation graph
        node_index = 2
        # total number of linear strategies
        strategy_number = 23

    physical_mesh_id = torch.arange(0, 4)
    mesh_shape = (2, 2)
    device_mesh = DeviceMesh(physical_mesh_id, mesh_shape, init_process_group=True)

    numerical_test_for_node_strategy(
        model=model,
        device_mesh=device_mesh,
        node_index=node_index,
        strategy_number=strategy_number,
        input_args=[input, other],
        meta_arg_names=["input", "other"],
        node_type="following",
    )
    tracer = ColoTracer(bias_addition_split=True)
    if model_cls.__name__ == "ConvViewModel":
        # graph():
        #     %input_1 : torch.Tensor [#users=1] = placeholder[target=input]
        #     %other : torch.Tensor [#users=1] = placeholder[target=other]
        #     %conv2d : [#users=1] = call_function[target=torch.conv2d](args = (%input_1, %other), kwargs = {})
        #     %view : [#users=1] = call_method[target=view](args = (%conv2d, 2, -1), kwargs = {})
        #     return view
        meta_args = {"input": torch.rand(8, 8, 66, 66).to("meta"), "other": torch.rand(16, 8, 3, 3).to("meta")}
        graph = tracer.trace(model, meta_args=meta_args)

    if model_cls.__name__ == "LinearViewModel":
        # graph():
        #     %input_1 : torch.Tensor [#users=1] = placeholder[target=input]
        #     %other : torch.Tensor [#users=1] = placeholder[target=other]
        #     %linear : [#users=1] = call_function[target=torch._C._nn.linear](args = (%input_1, %other), kwargs = {bias: None})
        #     %view : [#users=1] = call_method[target=view](args = (%linear, 32, 4, 32, 32, 4), kwargs = {})
        #     return view
        meta_args = {
            "input": torch.rand(8, 16, 64, 32).to("meta"),
            "other": torch.rand(64, 32).to("meta"),
        }
        graph = tracer.trace(model, meta_args=meta_args)

    gm = ColoGraphModule(model, graph)
    shape_prop_pass(gm, *meta_args.values())

    previous_mod_node = list(graph.nodes)[2]
    view_node = list(graph.nodes)[3]
    view_strategies_vector = StrategiesVector(view_node)
    previous_strategies_vector = StrategiesVector(previous_mod_node)

    # build handler
    if model_cls.__name__ == "ConvViewModel":
        conv_handler = ConvFunctionHandler(
            node=previous_mod_node, device_mesh=device_mesh, strategies_vector=previous_strategies_vector
        )
        conv_handler.register_strategy(compute_resharding_cost=False)
        setattr(previous_mod_node, "strategies_vector", previous_strategies_vector)

    if model_cls.__name__ == "LinearViewModel":
        assert len(previous_strategies_vector) == 0
        linear_handler = LinearFunctionHandler(
            node=previous_mod_node, device_mesh=device_mesh, strategies_vector=previous_strategies_vector
        )
        linear_handler.register_strategy(compute_resharding_cost=False)
        setattr(previous_mod_node, "strategies_vector", previous_strategies_vector)

    view_handler = ViewHandler(node=view_node, device_mesh=device_mesh, strategies_vector=view_strategies_vector)

    view_handler.register_strategy(compute_resharding_cost=False)

    # check operation data mapping
    mapping = view_handler.get_operation_data_mapping()

    for name, op_data in mapping.items():
        op_data: OperationData
        # make sure they have valid values
        assert op_data.data is not None

    if model_cls.__name__ == "ConvViewModel":
        assert mapping["input"].name == "conv2d"
    else:
        assert mapping["input"].name == "linear"
    assert mapping["input"].data.is_meta
    assert mapping["input"].data.shape == torch.Size([8, 16, 64, 64])
    assert mapping["input"].type == OperationDataType.ARG
    assert mapping["input"].logical_shape == torch.Size([8, 16, 64, 64])

    assert mapping["output"].name == "view"
    assert mapping["output"].data.is_meta
    assert mapping["output"].data.shape == torch.Size(tgt_shape)
    assert mapping["output"].type == OperationDataType.OUTPUT

    # reshape handler is a following strategy handler, so the number of strategies is equal to the predecessor node.
    assert len(view_strategies_vector) == len(previous_strategies_vector)
    strategy_name_list = [strategy.name for strategy in view_strategies_vector]

    if model_cls.__name__ == "ConvViewModel":
        if tgt_shape == (32, 4, 64, 16, 4):
            assert "[S0, S1, R, R] -> FULLY REPLICATED_0" in strategy_name_list
            assert "[S1, S0, R, R] -> FULLY REPLICATED_1" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R]_2" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R]_3" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R]_4" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R]_5" in strategy_name_list
            assert "[R, S1, R, R] -> FULLY REPLICATED_6" in strategy_name_list
            assert "[R, S0, R, R] -> FULLY REPLICATED_7" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_8" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_9" in strategy_name_list
            assert "[R, S0, R, R] -> FULLY REPLICATED_10" in strategy_name_list
            assert "[R, S1, R, R] -> FULLY REPLICATED_11" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_12" in strategy_name_list
            assert "[S01, R, R, R] -> [S01, R, R, R, R]_13" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_14" in strategy_name_list
            assert "[R, S01, R, R] -> FULLY REPLICATED_15" in strategy_name_list

        if tgt_shape == (8, 4, 4, 64, 16, 4):
            assert "[S0, S1, R, R] -> [S0, S1, R, R, R, R]_0" in strategy_name_list
            assert "[S1, S0, R, R] -> [S1, S0, R, R, R, R]_1" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R, R]_2" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R, R]_3" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R, R]_4" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R, R]_5" in strategy_name_list
            assert "[R, S1, R, R] -> [R, S1, R, R, R, R]_6" in strategy_name_list
            assert "[R, S0, R, R] -> [R, S0, R, R, R, R]_7" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_8" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_9" in strategy_name_list
            assert "[R, S0, R, R] -> [R, S0, R, R, R, R]_10" in strategy_name_list
            assert "[R, S1, R, R] -> [R, S1, R, R, R, R]_11" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_12" in strategy_name_list
            assert "[S01, R, R, R] -> [S01, R, R, R, R, R]_13" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_14" in strategy_name_list
            assert "[R, S01, R, R] -> [R, S01, R, R, R, R]_15" in strategy_name_list

    if model_cls.__name__ == "LinearViewModel":
        if tgt_shape == (32, 4, 64, 16, 4):
            for strategy in strategy_name_list:
                print(strategy)
            # print(strategy_name_list)
            assert "[S0, R, R, S1] -> [S0, R, R, S1, R]_11" in strategy_name_list
            assert "[R, S0, R, S1] -> FULLY REPLICATED_12" in strategy_name_list
            assert "[R, R, S0, S1] -> [R, R, S0, S1, R]_13" in strategy_name_list
            assert "[S1, R, R, S0] -> [S1, R, R, S0, R]_14" in strategy_name_list
            assert "[R, S1, R, S0] -> FULLY REPLICATED_15" in strategy_name_list
            assert "[R, R, S1, S0] -> [R, R, S1, S0, R]_16" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R]_17" in strategy_name_list
            assert "[R, S0, R, R] -> FULLY REPLICATED_18" in strategy_name_list
            assert "[R, R, S0, R] -> [R, R, S0, R, R]_19" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R]_20" in strategy_name_list
            assert "[R, S1, R, R] -> FULLY REPLICATED_21" in strategy_name_list
            assert "[R, R, S1, R] -> [R, R, S1, R, R]_22" in strategy_name_list
            assert "[R, R, R, S1] -> [R, R, R, S1, R]_10" in strategy_name_list
            assert "[R, R, R, S0] -> [R, R, R, S0, R]_9" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_8" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_7" in strategy_name_list
            assert "[R, R, R, S0] -> [R, R, R, S0, R]_6" in strategy_name_list
            assert "[R, R, R, S1] -> [R, R, R, S1, R]_5" in strategy_name_list
            assert "[S01, R, R, R] -> [S01, R, R, R, R]_0" in strategy_name_list
            assert "[R, S01, R, R] -> FULLY REPLICATED_1" in strategy_name_list
            assert "[R, R, S01, R] -> [R, R, S01, R, R]_2" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R]_3" in strategy_name_list
            assert "[R, R, R, S01] -> [R, R, R, S01, R]_4" in strategy_name_list

        if tgt_shape == (8, 4, 4, 64, 16, 4):
            assert "[S0, R, R, S1] -> [S0, R, R, R, S1, R]_11" in strategy_name_list
            assert "[R, S0, R, S1] -> [R, S0, R, R, S1, R]_12" in strategy_name_list
            assert "[R, R, S0, S1] -> [R, R, R, S0, S1, R]_13" in strategy_name_list
            assert "[S1, R, R, S0] -> [S1, R, R, R, S0, R]_14" in strategy_name_list
            assert "[R, S1, R, S0] -> [R, S1, R, R, S0, R]_15" in strategy_name_list
            assert "[R, R, S1, S0] -> [R, R, R, S1, S0, R]_16" in strategy_name_list
            assert "[S0, R, R, R] -> [S0, R, R, R, R, R]_17" in strategy_name_list
            assert "[R, S0, R, R] -> [R, S0, R, R, R, R]_18" in strategy_name_list
            assert "[R, R, S0, R] -> [R, R, R, S0, R, R]_19" in strategy_name_list
            assert "[S1, R, R, R] -> [S1, R, R, R, R, R]_20" in strategy_name_list
            assert "[R, S1, R, R] -> [R, S1, R, R, R, R]_21" in strategy_name_list
            assert "[R, R, S1, R] -> [R, R, R, S1, R, R]_22" in strategy_name_list
            assert "[R, R, R, S1] -> [R, R, R, R, S1, R]_10" in strategy_name_list
            assert "[R, R, R, S0] -> [R, R, R, R, S0, R]_9" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_8" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_7" in strategy_name_list
            assert "[R, R, R, S0] -> [R, R, R, R, S0, R]_6" in strategy_name_list
            assert "[R, R, R, S1] -> [R, R, R, R, S1, R]_5" in strategy_name_list
            assert "[S01, R, R, R] -> [S01, R, R, R, R, R]_0" in strategy_name_list
            assert "[R, S01, R, R] -> [R, S01, R, R, R, R]_1" in strategy_name_list
            assert "[R, R, S01, R] -> [R, R, R, S01, R, R]_2" in strategy_name_list
            assert "[R, R, R, R] -> [R, R, R, R, R, R]_3" in strategy_name_list
            assert "[R, R, R, S01] -> [R, R, R, R, S01, R]_4" in strategy_name_list


@run_on_environment_flag(name="AUTO_PARALLEL")
@pytest.mark.dist
@rerun_if_address_is_in_use()
@parameterize("tgt_shape", [(32, 4, 64, 16, 4), (8, 4, 4, 64, 16, 4)])
@parameterize("model_cls", [ConvViewModel, LinearViewModel])
def test_view_handler(tgt_shape, model_cls):
    spawn(check_view_handler, 4, tgt_shape=tgt_shape, model_cls=model_cls)


if __name__ == "__main__":
    test_view_handler()
