"""Install storage adapter in every serving worker, only when explicitly enabled."""
import importlib.abc
import importlib.machinery
import os
import sys

def _tp4_launcher():
    """True only inside containers started by start-tp4.sh (DSV41_LAUNCHER=tp4)."""
    return os.environ.get('DSV41_LAUNCHER', '') == 'tp4'

class EngramLoader(importlib.abc.Loader):
    def __init__(self, original):
        self.original = original

    def create_module(self, spec):
        return self.original.create_module(spec)

    def exec_module(self, module):
        self.original.exec_module(module)
        if module.__name__ == 'sglang.srt.layers.engram':
            from engram_backend import install
            install(module)
            # After engram_backend: Engram rows fetched on a side stream right after the
            # hasher. Gated on DSV41_ENGRAM_PREFETCH, inactive by default.
            from engram_prefetch import install as install_engram_prefetch
            install_engram_prefetch(module)
        elif module.__name__ == 'sglang.srt.model_loader.utils':
            if os.environ.get('DSV41_SERIAL_WEIGHT_LOAD', '0') == '1':
                # On GB10 the CPU shard pages and CUDA allocations share RAM.
                # Do not retain a queue of pending H2D copies while advancing
                # through the checkpoint; consume each tensor before the next.
                if not callable(getattr(module, 'should_async_load', None)):
                    raise RuntimeError(
                        'DSV41_SERIAL_WEIGHT_LOAD requires model_loader.utils.'
                        'should_async_load; rebuild against a compatible SGLang image'
                    )
                module.should_async_load = lambda *args, **kwargs: False
                print('DSV41: synchronous weight copies enabled (UMA safeguard)', flush=True)
        elif module.__name__ == 'sglang.srt.layers.quantization.fp8_utils':
            from mxfp8_b12x import install
            install(module)
            # TP4 only, and AFTER b12x, so shared_pad wraps its wrapper rather than the original.
            # Gated on DSV41_SHARED_PAD_K inside the module. L2 prefetch records which MXFP8
            # weights follow each RoCE collective; outermost wrapper, weight pointer only.
            if _tp4_launcher():
                from shared_pad_k import install as install_shared_pad
                install_shared_pad(module)
                if os.environ.get('DSV41_L2_PREFETCH', '0').strip() not in ('0', 'off', 'false', ''):
                    from l2_prefetch import install_fp8_utils as install_l2_prefetch_fp8
                    install_l2_prefetch_fp8(module)
        elif module.__name__ == 'sglang.srt.layers.quantization.fp8':
            from mxfp8_b12x import install_fp8
            install_fp8(module)
            if _tp4_launcher():
                from shared_pad_k import install_fp8 as install_shared_pad_fp8
                install_shared_pad_fp8(module)
        elif module.__name__ == 'sglang.srt.model_executor.model_runner':
            from prefill_empty_cache import install
            install(module)
        elif module.__name__ == 'sglang.srt.layers.attention.deepseek_v4_backend' and _tp4_launcher():
            # sglang#39187 backport: dense prefill indexer scored in bounded row chunks.
            # Gate checked BEFORE the import so a disabled flag imports nothing. v1 targets
            # the dev-dsv41 image backend (self.candidate_masks); v3 is the PR for
            # candidate_metadata backends (dsv4.1 branch >= f80c91a4b) plus the SG18 prefill
            # TP split. Each refuses the other.
            if os.environ.get('DSV41_INDEXER_CHUNKED', '0').strip() not in ('0', 'off', 'false', ''):
                import inspect as _inspect
                _src = _inspect.getsource(module.DeepseekV4AttnBackend._low_ratio_index_topk_dense)
                if 'self.candidate_masks' in _src:
                    from indexer_chunked import install as install_indexer_chunked
                else:
                    from indexer_chunked_v3 import install as install_indexer_chunked
                install_indexer_chunked(module)
        elif module.__name__ == 'sglang.srt.entrypoints.openai.encoding_dsv41':
            from encoding_compat import install_encoder
            install_encoder(module)
        elif module.__name__ == 'sglang.srt.entrypoints.openai.serving_chat':
            from encoding_compat import install_serving_chat
            install_serving_chat(module)
        elif module.__name__ == 'sglang.srt.model_loader.weight_utils' and _tp4_launcher():
            # Gated on DSV41_FAST_LOAD: this rank's tensors are read eagerly by a thread
            # pool instead of page-faulted through the loader's mmap (adapter/fast_load.py).
            from fast_load import install_weight_utils
            install_weight_utils(module)
        elif module.__name__ == 'sglang.srt.models.deepseek_v4':
            if _tp4_launcher():
                from fast_load import install_deepseek_v4
                install_deepseek_v4(module)
            # Gated on DSV41_WO_A_W8: verify/draft wo_a reads its fp8 checkpoint bytes.
            if os.environ.get('DSV41_WO_A_W8', '0').strip() not in ('0', 'off', 'false', ''):
                from wo_a_w8 import install_model as install_wo_a_w8
                install_wo_a_w8(module)
            # Gated on DSV41_VERIFY_CAP: marks target-verify forwards for the dead-row expert remap.
            if os.environ.get('DSV41_VERIFY_CAP', '').strip() not in ('', '0', 'off'):
                from verify_cap import install_model as install_verify_cap_model
                install_verify_cap_model(module)
            # TP4 only. DSV41_PREFILL_SP=comm|1: prefill sequence parallel (adapter/prefill_sp.py).
            # DSV41_PREFILL_SP_DEBUG alone (fingerprints on an otherwise stock boot) also installs it.
            if _tp4_launcher() and (
                    os.environ.get('DSV41_PREFILL_SP', '0').strip() not in ('0', 'off', 'false', '')
                    or os.environ.get('DSV41_PREFILL_SP_DEBUG', '').strip()):
                from prefill_sp import install as install_prefill_sp
                install_prefill_sp(module)
            # TP4 only. DSV41_L2_PREFETCH: brackets decode/verify forwards so each RoCE collective
            # forks an L2 prefetch of the weights that follow it (adapter/l2_prefetch.py).
            if _tp4_launcher() and os.environ.get('DSV41_L2_PREFETCH', '0').strip() not in ('0', 'off', 'false', ''):
                from l2_prefetch import install_model as install_l2_prefetch_model
                install_l2_prefetch_model(module)
        elif module.__name__ == 'sglang.srt.models.deepseek_v4_dspark':
            # DSV41_VERIFY_CAP=conf:T needs the draft confidence head, which the engine only builds
            # in the ragged-verify modes.
            if os.environ.get('DSV41_VERIFY_CAP', '').strip().startswith('conf:'):
                from verify_cap import install_dspark as install_verify_cap_dspark
                install_verify_cap_dspark(module)
            if _tp4_launcher():
                from fast_load import install_dspark
                install_dspark(module)
            if os.environ.get('DSV41_WO_A_W8', '0').strip() not in ('0', 'off', 'false', ''):
                from wo_a_w8 import install_dspark as install_wo_a_w8_dspark
                install_wo_a_w8_dspark(module)
            # TP4 only. DSV41_DRAFT_MAIN_PROJ_SPLIT: the draft's replicated main_proj column-split
            # over TP (fp8 shard + all-gather; target untouched).
            if _tp4_launcher() and os.environ.get('DSV41_DRAFT_MAIN_PROJ_SPLIT', '0').strip() not in ('0', 'off', 'false', ''):
                from draft_main_proj import install as install_draft_main_proj
                install_draft_main_proj(module)
            # Gated on DSV41_DRAFT_HEAD_FP8: the draft's LM head from an fp8 copy (target untouched).
            # On the TP4 launcher, DSV41_DRAFT_HEAD_FP8_IMPL=tp4 selects the batch-sized row tiles of
            # draft_head_fp8_tp4.py. ./start.sh always installs draft_head_fp8.py.
            if os.environ.get('DSV41_DRAFT_HEAD_FP8', '0').strip() not in ('0', 'off', 'false', ''):
                if _tp4_launcher() and os.environ.get('DSV41_DRAFT_HEAD_FP8_IMPL', '').strip() == 'tp4':
                    from draft_head_fp8_tp4 import install as install_draft_head_fp8
                else:
                    from draft_head_fp8 import install as install_draft_head_fp8
                install_draft_head_fp8(module)
        elif module.__name__ == 'sglang.srt.speculative.dspark_components.dspark_draft_sampler':
            # Gated on DSV41_DRAFT_TAU (unset or 1 = off): draft proposal temperature.
            if os.environ.get('DSV41_DRAFT_TAU', '1').strip() not in ('', '1', '1.0'):
                from draft_tau import install as install_draft_tau
                install_draft_tau(module)
        elif module.__name__ == 'sglang.kernels.ops.speculative.dspark.dspark_accept':
            # Gated on DSV41_BLOCK_VERIFY: block verification for sampled rows (lossless).
            if os.environ.get('DSV41_BLOCK_VERIFY', '0').strip() not in ('0', 'off', 'false', ''):
                from block_verify import install as install_block_verify
                install_block_verify(module)
        elif module.__name__ == 'sglang.srt.speculative.dspark_components.dspark_verify':
            # Gated on DSV41_FOLDED_FENCE: folded results cloned off the persistent verify buffers
            # (sglang#40919 race under overlap scheduling).
            if os.environ.get('DSV41_FOLDED_FENCE', '0').strip() not in ('0', 'off', 'false', ''):
                from folded_result_fence import install as install_folded_fence
                install_folded_fence(module)
            # Gated on DSV41_VERIFY_CAP: per-request verify length through the acceptance cutoff.
            if os.environ.get('DSV41_VERIFY_CAP', '').strip() not in ('', '0', 'off'):
                from verify_cap import install_verify as install_verify_cap_verify
                install_verify_cap_verify(module)
        elif module.__name__ == 'sglang.kernels.ops.moe.moe_fused_gate':
            if os.environ.get('DSV41_VERIFY_CAP', '').strip() not in ('', '0', 'off'):
                from verify_cap import install_gate as install_verify_cap_gate
                install_verify_cap_gate(module)
        elif module.__name__ == 'sglang.srt.speculative.dspark_components.dspark_draft':
            if os.environ.get('DSV41_VERIFY_CAP', '').strip() not in ('', '0', 'off'):
                from verify_cap import install_draft as install_verify_cap_draft
                install_verify_cap_draft(module)
        elif module.__name__ == 'sglang.srt.speculative.dspark_components.dspark_planner':
            if os.environ.get('DSV41_VERIFY_CAP', '').strip() not in ('', '0', 'off'):
                from verify_cap import install_planner as install_verify_cap_planner
                install_verify_cap_planner(module)
        elif module.__name__ == 'sglang.srt.model_executor.runner.flashinfer_autotune':
            # Gated on DSV41_AUTOTUNE_KEEP: keep the FlashInfer autotune cache across boots under EP
            # (sglang#40320: the stock gate deletes it on every boot).
            if os.environ.get('DSV41_AUTOTUNE_KEEP', '0').strip() not in ('0', 'off', 'false', ''):
                from autotune_keep import install as install_autotune_keep
                install_autotune_keep(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.srt.layers.linear':
            # Gated on DSV41_REPLICATED_SPLIT=<prefix suffixes>: chosen ReplicatedLinear layers
            # column-split over TP, enabled per layer only when bit-identical on every rank.
            if os.environ.get('DSV41_REPLICATED_SPLIT', '').strip():
                from replicated_split import install as install_replicated_split
                install_replicated_split(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.srt.distributed.device_communicators.pynccl':
            # Gated on DSV41_ROCE_GATHER=<max bytes per rank>: small TP all-gathers (the draft's
            # vocab-parallel logits) take the RoCEnante one-shot kernel instead of NCCL.
            if os.environ.get('DSV41_ROCE_GATHER', '0').strip() not in ('', '0'):
                from roce_gather import install as install_roce_gather
                install_roce_gather(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.srt.layers.quantization.mxfp4_flashinfer_cutlass_moe':
            # Gated on DSV41_MOE_B12X_NEXT: routed experts on b12x main (package b12x_next), which
            # also runs EP_SIZE=1 at TP4 (N=576 per rank). Gate checked BEFORE the import.
            if os.environ.get('DSV41_MOE_B12X_NEXT', '0').strip() not in ('0', 'off', 'false', ''):
                from moe_b12x_next import install_method as install_moe_b12x_next
                install_moe_b12x_next(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.srt.layers.moe.moe_runner.flashinfer_cutlass':
            if os.environ.get('DSV41_MOE_B12X_NEXT', '0').strip() not in ('0', 'off', 'false', ''):
                from moe_b12x_next import install_runner as install_moe_b12x_next_runner
                install_moe_b12x_next_runner(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.kernels.ops.layernorm.mhc':
            # Gated on DSV41_HC_FUSED: prefill-size hc mix stats in one K walk, bit-identical to
            # the stock split-K + reduce (adapter/hc_fused.py). Gate checked BEFORE the import.
            if os.environ.get('DSV41_HC_FUSED', '0').strip() not in ('0', 'off', 'false', ''):
                from hc_fused import install as install_hc_fused
                install_hc_fused(module)
        elif _tp4_launcher() and module.__name__ == 'sglang.srt.models.deepseek_v2':
            # Gated on DSV41_L2_PREFETCH: the bf16 router (tiny_gemm_bf16) is recorded too.
            if os.environ.get('DSV41_L2_PREFETCH', '0').strip() not in ('0', 'off', 'false', ''):
                from l2_prefetch import install_router as install_l2_prefetch_router
                install_l2_prefetch_router(module)
        elif _tp4_launcher() and module.__name__ in ('b12x.comm.roce.roce_oneshot', 'b12x.comm.roce_ring.roce_oneshot'):
            # Gated on DSV41_L2_PREFETCH: RoCEnante all-reduce/all-gather fork the prefetch branch.
            # Outside sglang; the finder sees its first import whichever package imports it first,
            # and install_model re-checks sys.modules in case it was imported before the finder.
            if os.environ.get('DSV41_L2_PREFETCH', '0').strip() not in ('0', 'off', 'false', ''):
                from l2_prefetch import install_roce as install_l2_prefetch_roce
                install_l2_prefetch_roce(module)
        elif module.__name__ == 'sglang.srt.managers.schedule_batch':
            from loop_abort import install as install_loop_abort
            install_loop_abort(module)
        else:
            # V4.1 ratio-1/2 indexers always call the FP4 DeepGEMM kernel.
            # SM120 needs its split-128 planner even when the legacy FP8
            # indexer uses the torch path. The upstream guard misses this case.
            cls = module.PagedIndexerMetadata
            original = cls.__post_init__
            def post_init(self):
                sm12 = bool(getattr(module, '_IS_SM120', False) or
                            getattr(module, '_IS_SM121', False))
                if sm12 and self.compress_ratio in (1, 2):
                    self.force_deep_gemm_metadata = True
                original(self)
            cls.__post_init__ = post_init

class EngramFinder(importlib.abc.MetaPathFinder):
    def find_spec(self, fullname, path=None, target=None):
        if (fullname == 'sglang.srt.model_loader.utils' and
                os.environ.get('DSV41_SERIAL_WEIGHT_LOAD', '0') != '1'):
            return None
        # The second tuple is the TP4 production line. start-tp4.sh is what puts
        # DSV41_LAUNCHER=tp4 in the container; ./start.sh never intercepts these.
        if fullname not in ('sglang.srt.layers.engram',
                            'sglang.srt.model_loader.utils',
                            'sglang.srt.layers.quantization.fp8_utils',
                            'sglang.srt.layers.quantization.fp8',
                            'sglang.srt.model_executor.model_runner',
                            'sglang.srt.entrypoints.openai.encoding_dsv41',
                            'sglang.srt.entrypoints.openai.serving_chat',
                            'sglang.srt.models.deepseek_v4',
                            'sglang.srt.models.deepseek_v4_dspark',
                            'sglang.srt.speculative.dspark_components.dspark_verify',
                            'sglang.srt.speculative.dspark_components.dspark_draft_sampler',
                            'sglang.kernels.ops.speculative.dspark.dspark_accept',
                            'sglang.srt.managers.schedule_batch',
                            'sglang.kernels.ops.moe.moe_fused_gate',
                            'sglang.srt.speculative.dspark_components.dspark_draft',
                            'sglang.srt.speculative.dspark_components.dspark_planner',
                            'sglang.srt.model_executor.runner.flashinfer_autotune',
                            'sglang.srt.layers.attention.dsv4.metadata'):
            if not _tp4_launcher() or fullname not in (
                            'sglang.srt.layers.attention.deepseek_v4_backend',
                            'sglang.srt.model_loader.weight_utils',
                            'sglang.srt.distributed.device_communicators.pynccl',
                            'sglang.srt.layers.linear',
                            'sglang.srt.layers.quantization.mxfp4_flashinfer_cutlass_moe',
                            'sglang.srt.layers.moe.moe_runner.flashinfer_cutlass',
                            'sglang.kernels.ops.layernorm.mhc',
                            'sglang.srt.models.deepseek_v2',
                            'b12x.comm.roce.roce_oneshot',
                            'b12x.comm.roce_ring.roce_oneshot'):
                return None
        spec = importlib.machinery.PathFinder.find_spec(fullname, path)
        if spec is not None:
            spec.loader = EngramLoader(spec.loader)
        return spec

if os.environ.get('DSV41_SOURCE'):
    sys.meta_path.insert(0, EngramFinder())
    try:
        import tp3_pad
        tp3_pad.install()
    except Exception as exc:
        print(f'DSV41 TP pad not installed: {exc}', flush=True)