# SPDX-License-Identifier: MIT
import pytest
import torch
import itertools
from typing import Optional, List  # Add this import at the top

from op_tests.utility.scalar_type import ScalarType, scalar_types
from op_tests.utility.utils import quantize_weights
from op_tests.utility.utils import torch_moe as torch_score_moe
from aiter.ops.triton.moe_op import fused_moe
from aiter.fused_moe import fused_topk, torch_moe
from aiter import ActivationType
from aiter.test_common import checkAllclose, perftest,benchmark
from aiter import ck_moe, ck_shuffle_moe, dtypes, silu_and_mul, gelu_and_mul, moe_sum
from aiter.ops.triton.utils.moe_config_utils import get_optimal_moe_config_func
from aiter.ops.triton.fused_moe import fused_experts_impl
from aiter.ops.triton.utils.types import torch_to_triton_dtype
from aiter.fused_moe_asm_wna16 import fused_experts_asm_impl
from aiter import per_token_quant_hip, per_block_quant_wrapper
import pandas as pd
import aiter
import os
BLOCK_SIZE_M = 32
MAX_TOKENS = 65536
os.environ["AMDGCN_USE_BUFFER_OPS"] = "1"

@perftest(num_warmup=1, num_iters=2)
def torch_moe_test(
    hidden_states,
    w1,
    w2,
    topk_weight,
    topk_ids,
    # following for int8 quant
    fc1_scale=None,  # [expert, inter_dim, 1]
    fc2_scale=None,  # [expert, model_dim, 1]
    fc1_smooth_scale=None,  # [expert, 1, model_dim]
    fc2_smooth_scale=None,  # [expert, 1, inter_dim]
    expert_mask=None,
):
    return torch_moe(
        hidden_states,
        w1,
        w2,
        topk_weight,
        topk_ids,
        fc1_scale,
        fc2_scale,
        fc1_smooth_scale,
        fc2_smooth_scale,
        expert_mask,
    )

@perftest(num_warmup=5, num_iters=10,testGraph=False)
def asm_fused_experts_impl(hidden_states: torch.Tensor,
                       w1: torch.Tensor,
                       w2: torch.Tensor,
                       topk_weights: torch.Tensor,
                       topk_ids: torch.Tensor,
                       dtype,
                       inplace: bool = False,
                       activation: str = "silu",
                       use_fp8_w8a8: bool = False,
                       use_int8_w8a8: bool = False,
                       use_int8_w4a8: bool = False,
                       use_int8_w8a16: bool = False,
                       use_int4_w4a16: bool = False,
                       per_channel_quant: bool = False,
                       global_num_experts: int = -1,
                       expert_map: Optional[torch.Tensor] = None,
                       w1_scale: Optional[torch.Tensor] = None,
                       w2_scale: Optional[torch.Tensor] = None,
                       w1_zp: Optional[torch.Tensor] = None,
                       w2_zp: Optional[torch.Tensor] = None,
                       a1_scale: Optional[torch.Tensor] = None,
                       a2_scale: Optional[torch.Tensor] = None,
                       block_shape: Optional[List[int]] = None):

    return fused_experts_asm_impl(
        hidden_states,
        w1,
        w2,
        topk_weights,
        topk_ids,
        dtype,
        inplace,
        activation,
        use_fp8_w8a8,
        use_int8_w8a8,
        use_int8_w4a8,
        use_int8_w8a16,
        use_int4_w4a16,
        per_channel_quant,
        global_num_experts,
        expert_map,
        w1_scale,
        w2_scale,
        w1_zp,
        w2_zp,
        a1_scale,
        a2_scale,
        block_shape
    )

@perftest(num_warmup=5, num_iters=10,testGraph=False)
def triton_fused_experts_impl(hidden_states: torch.Tensor,
                       w1: torch.Tensor,
                       w2: torch.Tensor,
                       topk_weights: torch.Tensor,
                       topk_ids: torch.Tensor,
                       odtype,
                       inplace: bool = False,
                       activation: str = "silu",
                       use_fp8_w8a8: bool = False,
                       use_int8_w8a8: bool = False,
                       use_int8_w8a16: bool = False,
                       use_int4_w4a16: bool = False,
                       use_int4_w4a8: bool = False,
                       per_channel_quant: bool = False,
                       global_num_experts: int = -1,
                       expert_map: Optional[torch.Tensor] = None,
                       w1_scale: Optional[torch.Tensor] = None,
                       w2_scale: Optional[torch.Tensor] = None,
                       w1_zp: Optional[torch.Tensor] = None,
                       w2_zp: Optional[torch.Tensor] = None,
                       a1_scale: Optional[torch.Tensor] = None,
                       a2_scale: Optional[torch.Tensor] = None,
                       block_shape: Optional[List[int]] = None):

    return fused_experts_impl(
        hidden_states,
        w1,
        w2,
        topk_weights,
        topk_ids,
        odtype,
        inplace,
        activation,
        use_fp8_w8a8,
        use_int8_w8a8,
        use_int8_w8a16,
        use_int4_w4a16,
        use_int4_w4a8,
        per_channel_quant,
        global_num_experts,
        expert_map,
        w1_scale,
        w2_scale,
        w1_zp,
        w2_zp,
        a1_scale,
        a2_scale,
        block_shape
    )

@benchmark()
def test_fmoe_w8a8_fused_shared_experts(
    dtype,
    token,
    model_dim,
    inter_dim,
    local_E,
    shared_E,
    local_topk,
    has_zp,
    quant="No",
):

    input = torch.randn((token, model_dim), dtype=dtype, device="cuda") / 10

    # 1. original weight in fp16/fp32
    w1_local = torch.randn((local_E, inter_dim * 2, model_dim), dtype=dtype, device="cuda") / 2
    w2_local = torch.randn((local_E, model_dim, inter_dim), dtype=dtype, device="cuda") / 2
    w1_shared = torch.randn((shared_E, inter_dim * 2, model_dim), dtype=dtype, device="cuda") / 2
    w2_shared = torch.randn((shared_E, model_dim, inter_dim), dtype=dtype, device="cuda") / 2

    w1_local_ref = w1_local.clone()
    w2_local_ref = w2_local.clone()
    w1_shared_ref = w1_shared.clone()
    w2_shared_ref = w2_shared.clone()

    w1_total_ref = torch.cat([w1_local, w1_shared], dim=0)  # (local_E + shared_E, inter_dim * 2, model_dim)
    w2_total_ref = torch.cat([w2_local, w2_shared], dim=0)  # (local_E + shared_E, model_dim, inter_dim)

    # 2. quantize weight to int8
    max_vals = torch.abs(w1_local.to(torch.float32)).max(dim=-1, keepdim=True)[0]
    max_vals = max_vals.clamp(min=1e-5)
    w1_local_scales = max_vals / 127.0
    w1_local_qweight = (w1_local / max_vals * 127.0).round().clamp(min=-128, max=127).to(torch.int8)

    max_vals = torch.abs(w2_local.to(torch.float32)).max(dim=-1, keepdim=True)[0]
    max_vals = max_vals.clamp(min=1e-5)
    w2_local_scales = max_vals / 127.0
    w2_local_qweight = (w2_local / max_vals * 127.0).round().clamp(min=-128, max=127).to(torch.int8)

    max_vals = torch.abs(w1_shared.to(torch.float32)).max(dim=-1, keepdim=True)[0]
    max_vals = max_vals.clamp(min=1e-5)
    w1_shared_scales = max_vals / 127.0
    w1_shared_qweight = (w1_shared / max_vals * 127.0).round().clamp(min=-128, max=127).to(torch.int8)

    max_vals = torch.abs(w2_shared.to(torch.float32)).max(dim=-1, keepdim=True)[0]
    max_vals = max_vals.clamp(min=1e-5)
    w2_shared_scales = max_vals / 127.0
    w2_shared_qweight = (w2_shared / max_vals * 127.0).round().clamp(min=-128, max=127).to(torch.int8)

    w1_total_qweight = torch.cat([w1_local_qweight, w1_shared_qweight], dim=0)
    w2_total_qweight = torch.cat([w2_local_qweight, w2_shared_qweight], dim=0)
    w1_total_scales = torch.cat([w1_local_scales, w1_shared_scales], dim=0)
    w2_total_scales = torch.cat([w2_local_scales, w2_shared_scales], dim=0)


    # 3. generate score for local experts
    local_score = torch.randn((token, local_E), device="cuda", dtype=dtype)
    # Add small unique offset to each expert to ensure unique scores
    local_score += torch.arange(local_E, device="cuda", dtype=dtype).unsqueeze(0) * 1e-5

    # 目前 biased_grouped_topk 接口暂不支持softmax方案,而是为local_score执行sigmoid，故is_softmax=False
    local_topk_weights, local_topk_ids = fused_topk(input, local_score, local_topk, True, is_softmax=False)

    # 4. local expert golden output
    torch_local_out, torch_local_avg = torch_moe_test(
        input, w1_local_ref, w2_local_ref, local_topk_weights, local_topk_ids
    )

    # 5. sharded expert golden output. 若多个shared expert结果直接相加，等价于多个shared expert的topk weight相同，即fused_topk_weights[:, local_topk:] = 1.0
    SHARED_EXPERT_WEIGHT = 1.0
    torch_shared_out = torch.zeros((token, model_dim), dtype=dtype, device=input.device)
    for e in range(shared_E):
        gate_up_e = input @ w1_shared_ref[e].transpose(0, 1)  # (token, inter_dim * 2)
        silu_out_e = torch.empty((token, inter_dim), dtype=dtype, device=input.device)
        silu_and_mul(silu_out_e, gate_up_e)
        out_e = silu_out_e @ w2_shared_ref[e].transpose(0, 1)  # (token, model_dim)
        torch_shared_out += (out_e * SHARED_EXPERT_WEIGHT)

    # 6. local + shared output
    torch_total_out = torch_local_out + torch_shared_out

    # 7. get fused topk ids and weights
    # 7.1 local method
    total_topk = local_topk + shared_E
    fused_topk_ids = torch.empty(token, total_topk, dtype=dtypes.i32, device=input.device)
    fused_topk_ids[:, :local_topk] = local_topk_ids
    # 在local_topk后面补上shared expert的id
    fused_topk_ids[:, local_topk:] = torch.arange(local_E, local_E + shared_E, device=input.device).unsqueeze(0).expand(token, -1)
    
    fused_topk_weights = torch.empty(token, total_topk, dtype=dtypes.fp32, device=input.device)
    fused_topk_weights[:, :local_topk] = local_topk_weights
    fused_topk_weights[:, local_topk:] = SHARED_EXPERT_WEIGHT

    # 7.2 fused shared expert topk method
    fused_topk_ids_0 = torch.empty(token, total_topk, dtype=dtypes.i32, device=input.device)
    fused_topk_weights_0 = torch.empty(token, total_topk, dtype=dtypes.fp32, device=input.device)
    aiter.biased_grouped_topk(
        gating_output = local_score,
        correction_bias = torch.zeros(local_E, device=input.device),  # bias for all experts, zeros
        topk_weights = fused_topk_weights_0,
        topk_ids = fused_topk_ids_0,
        num_expert_group = 1,
        topk_group = 1,
        num_fused_shared_experts = shared_E,
        need_renorm = True,
        routed_scaling_factor = 1.0,
    )

    # print(f"topk_ids:\n{fused_topk_ids}\nfused_topk_ids_0:\n{fused_topk_ids_0}")
    msg = f"[Fused shared expert topk ids] {token=}, {local_E=}, {local_topk=}, {shared_E=}"
    checkAllclose(fused_topk_ids, fused_topk_ids_0, rtol=0.01, atol=0.01, msg=msg)

    # print(f"fused_topk_weights:\n{fused_topk_weights}\nfused_topk_weights_0:\n{fused_topk_weights_0}")
    msg = f"[Fused shared expert topk weights] {token=}, {local_E=}, {local_topk=}, {shared_E=}"
    checkAllclose(fused_topk_weights, fused_topk_weights_0, rtol=0.01, atol=0.01, msg=msg)


    # 8. torch fused shared expert output
    torch_fused_out, torch_fused_avg = torch_moe_test(
        input, w1_total_ref, w2_total_ref, fused_topk_weights, fused_topk_ids
    )

    # 9. 验证fused experts算法正确性
    msg = f"[Fused shared expert logit] {token=}, {model_dim=}, {inter_dim=}, {local_E=}, {shared_E=}, {local_topk=}, dtype: {dtype}, torch_fused_avg: {torch_fused_avg:<8.2f} us"
    checkAllclose(torch_total_out, torch_fused_out, rtol=0.01, atol=10, msg=msg)


    # 10. triton fused shared expert output
    input_q, input_scale = per_token_quant_hip(input,quant_dtype=torch.int8)
    triton_output, avg_triton = triton_fused_experts_impl(
        input_q,
        w1_total_qweight,
        w2_total_qweight,
        fused_topk_weights_0,
        fused_topk_ids_0,
        dtype,
        inplace=False,
        activation="silu",
        use_fp8_w8a8=False,
        use_int8_w8a8=True,
        use_int8_w8a16=False,
        use_int4_w4a16=False,
        use_int4_w4a8=False,
        per_channel_quant=True,
        global_num_experts=local_E + shared_E,
        expert_map=None,
        w1_scale=w1_total_scales,
        w2_scale=w2_total_scales,
        w1_zp=None,
        w2_zp=None,
        a1_scale=input_scale,
        a2_scale=None,
        block_shape=None)
    msg = f"[TRITON_fused_test] {token=}, {model_dim=}, {inter_dim=}, {local_E=}, {shared_E=}, {local_topk=}, dtype: {dtype}, triton_avg: {avg_triton:>8.2f} us, torch_fused_avg: {torch_fused_avg:>8.2f} us"
    checkAllclose(torch_total_out, triton_output, rtol=0.01, atol=50, msg=msg)


    return {
        "local_avg_torch": torch_local_avg,
        "avg_triton": avg_triton,
    }



df = []

for dtype in [dtypes.fp16]:
    for m in [1, 16]:
        for dim in [7168]:
            for hdim in [256]:
                for sh_e in [1, 2]:
                    ret = test_fmoe_w8a8_fused_shared_experts(dtype, m, dim, hdim, 128, sh_e, 8, False, quant="int8")
                    df.append(ret)

df = pd.DataFrame(df)
# df.to_csv("test_moe_w8a8_fused_shared_experts.csv")
aiter.logger.info(f"summary:\n{df}")

