"""
Copyright 2023-2024 SGLang Team
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

"""The arguments of the server."""

import argparse
import dataclasses
import logging
import random
from typing import List, Optional, Union

logger = logging.getLogger(__name__)


class LoRAPathAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        setattr(namespace, self.dest, {})
        for lora_path in values:
            if "=" in lora_path:
                name, path = lora_path.split("=", 1)
                getattr(namespace, self.dest)[name] = path
            else:
                getattr(namespace, self.dest)[lora_path] = lora_path


@dataclasses.dataclass
class ServerArgs:
    # Model and tokenizer
    model_path: str
    tokenizer_path: Optional[str] = None
    tokenizer_mode: str = "auto"
    skip_tokenizer_init: bool = False
    load_format: str = "auto"
    dtype: str = "auto"
    kv_cache_dtype: str = "auto"
    trust_remote_code: bool = True
    context_length: Optional[int] = None
    quantization: Optional[str] = None
    served_model_name: Optional[str] = None
    chat_template: Optional[str] = None
    is_embedding: bool = False

    # Port
    host: str = "127.0.0.1"
    port: int = 30000
    additional_ports: Optional[Union[List[int], int]] = None

    # Memory and scheduling
    mem_fraction_static: Optional[float] = None
    max_running_requests: Optional[int] = None
    max_total_tokens: Optional[int] = None
    chunked_prefill_size: int = 8192
    max_prefill_tokens: int = 16384
    schedule_policy: str = "lpm"
    schedule_conservativeness: float = 1.0

    # Other runtime options
    tp_size: int = 1
    stream_interval: int = 1
    random_seed: Optional[int] = None
    constrained_json_whitespace_pattern: Optional[str] = None

    # Logging
    log_level: str = "info"
    log_level_http: Optional[str] = None
    log_requests: bool = False
    show_time_cost: bool = False

    # Other
    api_key: Optional[str] = None
    file_storage_pth: str = "SGLang_storage"

    # Data parallelism
    dp_size: int = 1
    load_balance_method: str = "round_robin"

    # Distributed args
    nccl_init_addr: Optional[str] = None
    nnodes: int = 1
    node_rank: Optional[int] = None

    # Model override args in JSON
    json_model_override_args: str = "{}"

    # Optimization/debug options
    attention_backend: Optional[str] = None
    sampling_backend: Optional[str] = None

    disable_flashinfer: bool = False
    disable_flashinfer_sampling: bool = False
    disable_radix_cache: bool = False
    disable_regex_jump_forward: bool = False
    disable_cuda_graph: bool = False
    disable_cuda_graph_padding: bool = False
    disable_disk_cache: bool = False
    disable_custom_all_reduce: bool = False
    enable_mixed_chunk: bool = False
    enable_torch_compile: bool = False
    torchao_config: str = ""
    enable_p2p_check: bool = False
    enable_mla: bool = False
    triton_attention_reduce_in_fp32: bool = False

    # LoRA
    lora_paths: Optional[List[str]] = None
    max_loras_per_batch: int = 8

    def __post_init__(self):
        # Set missing default values
        if self.tokenizer_path is None:
            self.tokenizer_path = self.model_path

        if self.served_model_name is None:
            self.served_model_name = self.model_path

        if self.chunked_prefill_size <= 0:
            # Disable chunked prefill
            self.chunked_prefill_size = None

        # Mem fraction depends on the tensor parallelism size
        if self.mem_fraction_static is None:
            if self.tp_size >= 16:
                self.mem_fraction_static = 0.79
            elif self.tp_size >= 8:
                self.mem_fraction_static = 0.83
            elif self.tp_size >= 4:
                self.mem_fraction_static = 0.85
            elif self.tp_size >= 2:
                self.mem_fraction_static = 0.87
            else:
                self.mem_fraction_static = 0.88

        if isinstance(self.additional_ports, int):
            self.additional_ports = [self.additional_ports]
        elif self.additional_ports is None:
            self.additional_ports = []

        if self.random_seed is None:
            self.random_seed = random.randint(0, 1 << 30)

        # Deprecation warnings
        if self.disable_flashinfer:
            logger.warning(
                "The option '--disable-flashinfer' will be deprecated in the next release. "
                "Please use '--attention-backend triton' instead."
            )
            self.attention_backend = "triton"
        if self.disable_flashinfer_sampling:
            logger.warning(
                "The option '--disable-flashinfer-sampling' will be deprecated in the next release. "
                "Please use '--sampling-backend pytorch' instead. "
            )
            self.sampling_backend = "pytorch"

        # Default kernel backends
        if self.enable_mla:
            logger.info("MLA optimization is tunred on. Use triton backend.")
            self.attention_backend = "triton"

        if self.attention_backend is None:
            self.attention_backend = "flashinfer"

        if self.sampling_backend is None:
            self.sampling_backend = "flashinfer"

        # Model-specific patches
        if "Alibaba-NLP/gte-Qwen2-1.5B-instruct" == self.model_path:
            logger.info(
                "Not sure why, the tokenizer will add an additional token at the end of the prompt when trust_remote_mode=True"
            )
            self.trust_remote_code = False

        if "gemma-2" in self.model_path.lower():
            logger.info("When using sliding window in gemma-2, turn on flashinfer.")
            self.attention_backend = "flashinfer"

    @staticmethod
    def add_cli_args(parser: argparse.ArgumentParser):
        parser.add_argument(
            "--model-path",
            type=str,
            help="The path of the model weights. This can be a local folder or a Hugging Face repo ID.",
            required=True,
        )
        parser.add_argument(
            "--tokenizer-path",
            type=str,
            default=ServerArgs.tokenizer_path,
            help="The path of the tokenizer.",
        )
        parser.add_argument(
            "--host", type=str, default=ServerArgs.host, help="The host of the server."
        )
        parser.add_argument(
            "--port", type=int, default=ServerArgs.port, help="The port of the server."
        )
        parser.add_argument(
            "--additional-ports",
            type=int,
            nargs="*",
            default=[],
            help="The additional ports specified for the server.",
        )
        parser.add_argument(
            "--tokenizer-mode",
            type=str,
            default=ServerArgs.tokenizer_mode,
            choices=["auto", "slow"],
            help="Tokenizer mode. 'auto' will use the fast "
            "tokenizer if available, and 'slow' will "
            "always use the slow tokenizer.",
        )
        parser.add_argument(
            "--skip-tokenizer-init",
            action="store_true",
            help="If set, skip init tokenizer and pass input_ids in generate request",
        )
        parser.add_argument(
            "--load-format",
            type=str,
            default=ServerArgs.load_format,
            choices=["auto", "pt", "safetensors", "npcache", "dummy"],
            help="The format of the model weights to load. "
            '"auto" will try to load the weights in the safetensors format '
            "and fall back to the pytorch bin format if safetensors format "
            "is not available. "
            '"pt" will load the weights in the pytorch bin format. '
            '"safetensors" will load the weights in the safetensors format. '
            '"npcache" will load the weights in pytorch format and store '
            "a numpy cache to speed up the loading. "
            '"dummy" will initialize the weights with random values, '
            "which is mainly for profiling.",
        )
        parser.add_argument(
            "--dtype",
            type=str,
            default=ServerArgs.dtype,
            choices=["auto", "half", "float16", "bfloat16", "float", "float32"],
            help="Data type for model weights and activations.\n\n"
            '* "auto" will use FP16 precision for FP32 and FP16 models, and '
            "BF16 precision for BF16 models.\n"
            '* "half" for FP16. Recommended for AWQ quantization.\n'
            '* "float16" is the same as "half".\n'
            '* "bfloat16" for a balance between precision and range.\n'
            '* "float" is shorthand for FP32 precision.\n'
            '* "float32" for FP32 precision.',
        )
        parser.add_argument(
            "--kv-cache-dtype",
            type=str,
            default=ServerArgs.kv_cache_dtype,
            choices=["auto", "fp8_e5m2"],
            help='Data type for kv cache storage. "auto" will use model data type. "fp8_e5m2" is supported for CUDA 11.8+.',
        )
        parser.add_argument(
            "--trust-remote-code",
            action="store_true",
            help="Whether or not to allow for custom models defined on the Hub in their own modeling files.",
        )
        parser.add_argument(
            "--context-length",
            type=int,
            default=ServerArgs.context_length,
            help="The model's maximum context length. Defaults to None (will use the value from the model's config.json instead).",
        )
        parser.add_argument(
            "--quantization",
            type=str,
            default=ServerArgs.quantization,
            choices=[
                "awq",
                "fp8",
                "gptq",
                "marlin",
                "gptq_marlin",
                "awq_marlin",
                "squeezellm",
                "bitsandbytes",
            ],
            help="The quantization method.",
        )
        parser.add_argument(
            "--served-model-name",
            type=str,
            default=ServerArgs.served_model_name,
            help="Override the model name returned by the v1/models endpoint in OpenAI API server.",
        )
        parser.add_argument(
            "--chat-template",
            type=str,
            default=ServerArgs.chat_template,
            help="The buliltin chat template name or the path of the chat template file. This is only used for OpenAI-compatible API server.",
        )
        parser.add_argument(
            "--is-embedding",
            action="store_true",
            help="Whether to use a CausalLM as an embedding model.",
        )
        parser.add_argument(
            "--mem-fraction-static",
            type=float,
            default=ServerArgs.mem_fraction_static,
            help="The fraction of the memory used for static allocation (model weights and KV cache memory pool). Use a smaller value if you see out-of-memory errors.",
        )
        parser.add_argument(
            "--max-running-requests",
            type=int,
            default=ServerArgs.max_running_requests,
            help="The maximum number of running requests.",
        )
        parser.add_argument(
            "--max-total-tokens",
            type=int,
            default=ServerArgs.max_total_tokens,
            help="The maximum number of tokens in the memory pool. If not specified, it will be automatically calculated based on the memory usage fraction. "
            "This option is typically used for development and debugging purposes.",
        )
        parser.add_argument(
            "--chunked-prefill-size",
            type=int,
            default=ServerArgs.chunked_prefill_size,
            help="The maximum number of tokens in a chunk for the chunked prefill. Setting this to -1 means disabling chunked prefill",
        )
        parser.add_argument(
            "--max-prefill-tokens",
            type=int,
            default=ServerArgs.max_prefill_tokens,
            help="The maximum number of tokens in a prefill batch. The real bound will be the maximum of this value and the model's maximum context length.",
        )
        parser.add_argument(
            "--schedule-policy",
            type=str,
            default=ServerArgs.schedule_policy,
            choices=["lpm", "random", "fcfs", "dfs-weight"],
            help="The scheduling policy of the requests.",
        )
        parser.add_argument(
            "--schedule-conservativeness",
            type=float,
            default=ServerArgs.schedule_conservativeness,
            help="How conservative the schedule policy is. A larger value means more conservative scheduling. Use a larger value if you see requests being retracted frequently.",
        )
        parser.add_argument(
            "--tensor-parallel-size",
            "--tp-size",
            type=int,
            default=ServerArgs.tp_size,
            help="The tensor parallelism size.",
        )
        parser.add_argument(
            "--stream-interval",
            type=int,
            default=ServerArgs.stream_interval,
            help="The interval (or buffer size) for streaming in terms of the token length. A smaller value makes streaming smoother, while a larger value makes the throughput higher",
        )
        parser.add_argument(
            "--random-seed",
            type=int,
            default=ServerArgs.random_seed,
            help="The random seed.",
        )
        parser.add_argument(
            "--constrained-json-whitespace-pattern",
            type=str,
            default=ServerArgs.constrained_json_whitespace_pattern,
            help=r"Regex pattern for syntactic whitespaces allowed in JSON constrained output. For example, to allow the model generate consecutive whitespaces, set the pattern to [\n\t ]*",
        )
        parser.add_argument(
            "--log-level",
            type=str,
            default=ServerArgs.log_level,
            help="The logging level of all loggers.",
        )
        parser.add_argument(
            "--log-level-http",
            type=str,
            default=ServerArgs.log_level_http,
            help="The logging level of HTTP server. If not set, reuse --log-level by default.",
        )
        parser.add_argument(
            "--log-requests",
            action="store_true",
            help="Log the inputs and outputs of all requests.",
        )
        parser.add_argument(
            "--show-time-cost",
            action="store_true",
            help="Show time cost of custom marks.",
        )
        parser.add_argument(
            "--api-key",
            type=str,
            default=ServerArgs.api_key,
            help="Set API key of the server. It is also used in the OpenAI API compatible server.",
        )
        parser.add_argument(
            "--file-storage-pth",
            type=str,
            default=ServerArgs.file_storage_pth,
            help="The path of the file storage in backend.",
        )

        # Data parallelism
        parser.add_argument(
            "--data-parallel-size",
            "--dp-size",
            type=int,
            default=ServerArgs.dp_size,
            help="The data parallelism size.",
        )
        parser.add_argument(
            "--load-balance-method",
            type=str,
            default=ServerArgs.load_balance_method,
            help="The load balancing strategy for data parallelism.",
            choices=[
                "round_robin",
                "shortest_queue",
            ],
        )

        # Multi-node distributed serving args
        parser.add_argument(
            "--nccl-init-addr",
            type=str,
            help="The nccl init address of multi-node server.",
        )
        parser.add_argument(
            "--nnodes", type=int, default=ServerArgs.nnodes, help="The number of nodes."
        )
        parser.add_argument("--node-rank", type=int, help="The node rank.")

        # Model override args
        parser.add_argument(
            "--json-model-override-args",
            type=str,
            help="A dictionary in JSON string format used to override default model configurations.",
            default=ServerArgs.json_model_override_args,
        )

        # Optimization/debug options
        parser.add_argument(
            "--attention-backend",
            type=str,
            choices=["flashinfer", "triton"],
            default=ServerArgs.attention_backend,
            help="Choose the kernels for attention layers.",
        )
        parser.add_argument(
            "--sampling-backend",
            type=str,
            choices=["flashinfer", "pytorch"],
            default=ServerArgs.sampling_backend,
            help="Choose the kernels for sampling layers.",
        )
        parser.add_argument(
            "--disable-flashinfer",
            action="store_true",
            help="Disable flashinfer attention kernels. This option will be deprecated in the next release. Please use '--attention-backend triton' instead.",
        )
        parser.add_argument(
            "--disable-flashinfer-sampling",
            action="store_true",
            help="Disable flashinfer sampling kernels. This option will be deprecated in the next release. Please use '--sampling-backend pytorch' instead.",
        )
        parser.add_argument(
            "--disable-radix-cache",
            action="store_true",
            help="Disable RadixAttention for prefix caching.",
        )
        parser.add_argument(
            "--disable-regex-jump-forward",
            action="store_true",
            help="Disable regex jump-forward.",
        )
        parser.add_argument(
            "--disable-cuda-graph",
            action="store_true",
            help="Disable cuda graph.",
        )
        parser.add_argument(
            "--disable-cuda-graph-padding",
            action="store_true",
            help="Disable cuda graph when padding is needed. Still uses cuda graph when padding is not needed.",
        )
        parser.add_argument(
            "--disable-disk-cache",
            action="store_true",
            help="Disable disk cache to avoid possible crashes related to file system or high concurrency.",
        )
        parser.add_argument(
            "--disable-custom-all-reduce",
            action="store_true",
            default=False,
            help="Disable the custom all-reduce kernel and fall back to NCCL.",
        )
        parser.add_argument(
            "--enable-mixed-chunk",
            action="store_true",
            help="Enabling mixing prefill and decode in a batch when using chunked prefill.",
        )
        parser.add_argument(
            "--enable-torch-compile",
            action="store_true",
            help="Optimize the model with torch.compile. Experimental feature.",
        )
        parser.add_argument(
            "--torchao-config",
            type=str,
            default=ServerArgs.torchao_config,
            help="Optimize the model with torchao. Experimental feature. Current choices are: int8dq, int8wo, int4wo-<group_size>, fp8wo",
        )
        parser.add_argument(
            "--enable-p2p-check",
            action="store_true",
            help="Enable P2P check for GPU access, otherwise the p2p access is allowed by default.",
        )
        parser.add_argument(
            "--enable-mla",
            action="store_true",
            help="Enable Multi-head Latent Attention (MLA) for DeepSeek-V2.",
        )
        parser.add_argument(
            "--triton-attention-reduce-in-fp32",
            action="store_true",
            help="Cast the intermidiate attention results to fp32 to avoid possible crashes related to fp16."
            "This only affects Triton attention kernels.",
        )
        parser.add_argument(
            "--efficient-weight-load",
            action="store_true",
            help="Turn on memory efficient weight loading with quantization (quantize per layer during loading).",
        )

        # LoRA options
        parser.add_argument(
            "--lora-paths",
            type=str,
            nargs="*",
            default=None,
            action=LoRAPathAction,
            help="The list of LoRA adapters. You can provide a list of either path in str or renamed path in the format {name}={path}",
        )
        parser.add_argument(
            "--max-loras-per-batch",
            type=int,
            default=8,
            help="Maximum number of adapters for a running batch, include base-only request",
        )

    @classmethod
    def from_cli_args(cls, args: argparse.Namespace):
        args.tp_size = args.tensor_parallel_size
        args.dp_size = args.data_parallel_size
        attrs = [attr.name for attr in dataclasses.fields(cls)]
        return cls(**{attr: getattr(args, attr) for attr in attrs})

    def url(self):
        return f"http://{self.host}:{self.port}"

    def check_server_args(self):
        assert (
            self.tp_size % self.nnodes == 0
        ), "tp_size must be divisible by number of nodes"
        assert not (
            self.dp_size > 1 and self.node_rank is not None
        ), "multi-node data parallel is not supported"
        assert (
            self.max_loras_per_batch > 0
            # FIXME
            and (self.lora_paths is None or self.disable_cuda_graph)
            and (self.lora_paths is None or self.disable_radix_cache)
        ), "compatibility of lora and cuda graph and radix attention is in progress"


def prepare_server_args(argv: List[str]) -> ServerArgs:
    """
    Prepare the server arguments from the command line arguments.

    Args:
        args: The command line arguments. Typically, it should be `sys.argv[1:]`
            to ensure compatibility with `parse_args` when no arguments are passed.

    Returns:
        The server arguments.
    """
    parser = argparse.ArgumentParser()
    ServerArgs.add_cli_args(parser)
    raw_args = parser.parse_args(argv)
    server_args = ServerArgs.from_cli_args(raw_args)
    return server_args


@dataclasses.dataclass
class PortArgs:
    tokenizer_port: int
    controller_port: int
    detokenizer_port: int
    nccl_ports: List[int]
