# 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 definition of objects transfered between different
processes (TokenizerManager, DetokenizerManager, Controller).
"""

import uuid
from dataclasses import dataclass
from enum import Enum
from typing import Dict, List, Optional, Tuple, Union

import torch

from sglang.srt.managers.schedule_batch import BaseFinishReason
from sglang.srt.sampling.sampling_params import SamplingParams


@dataclass
class SessionParams:
    id: Optional[str] = None
    rid: Optional[str] = None
    offset: Optional[int] = None
    replace: Optional[bool] = None


@dataclass
class GenerateReqInput:
    # The input prompt. It can be a single prompt or a batch of prompts.
    text: Optional[Union[List[str], str]] = None
    # The token ids for text; one can specify either text or input_ids
    input_ids: Optional[Union[List[List[int]], List[int]]] = None
    # The embeddings for input_ids; one can specify either text or input_ids or input_embeds.
    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None
    # The image input. It can be a file name, a url, or base64 encoded string.
    # See also python/sglang/srt/utils.py:load_image.
    image_data: Optional[Union[List[str], str]] = None
    # The sampling_params. See descriptions below.
    sampling_params: Optional[Union[List[Dict], Dict]] = None
    # The request id.
    rid: Optional[Union[List[str], str]] = None
    # Whether to return logprobs.
    return_logprob: Optional[Union[List[bool], bool]] = None
    # If return logprobs, the start location in the prompt for returning logprobs.
    # By default, this value is "-1", which means it will only return logprobs for output tokens.
    logprob_start_len: Optional[Union[List[int], int]] = None
    # If return logprobs, the number of top logprobs to return at each position.
    top_logprobs_num: Optional[Union[List[int], int]] = None
    # Whether to detokenize tokens in text in the returned logprobs.
    return_text_in_logprobs: bool = False
    # Whether to stream output.
    stream: bool = False
    # The modalities of the image data [image, multi-images, video]
    modalities: Optional[List[str]] = None
    # LoRA related
    lora_path: Optional[Union[List[Optional[str]], Optional[str]]] = None

    # Session info for continual prompting
    session_params: Optional[Union[List[Dict], Dict]] = None

    def normalize_batch_and_arguments(self):
        if (
            self.text is None and self.input_ids is None and self.input_embeds is None
        ) or (
            self.text is not None
            and self.input_ids is not None
            and self.input_embeds is not None
        ):
            raise ValueError(
                "Either text, input_ids or input_embeds should be provided."
            )

        # Derive the batch size
        if self.text is not None:
            if isinstance(self.text, str):
                self.is_single = True
                self.batch_size = 1
            else:
                self.is_single = False
                self.batch_size = len(self.text)
            self.input_embeds = None
        elif self.input_ids is not None:
            if isinstance(self.input_ids[0], int):
                self.is_single = True
                self.batch_size = 1
            else:
                self.is_single = False
                self.batch_size = len(self.input_ids)
            self.input_embeds = None
        else:
            if isinstance(self.input_embeds[0][0], float):
                self.is_single = True
                self.batch_size = 1
            else:
                self.batch_size = len(self.input_embeds)

        # Handle parallel sampling
        # When parallel sampling is used, we always treat the input as a batch.
        if self.sampling_params is None:
            self.parallel_sample_num = 1
        elif isinstance(self.sampling_params, dict):
            self.parallel_sample_num = self.sampling_params.get("n", 1)
        else:  # isinstance(self.sampling_params, list):
            self.parallel_sample_num = self.sampling_params[0].get("n", 1)
            assert all(
                self.parallel_sample_num == sampling_params.get("n", 1)
                for sampling_params in self.sampling_params
            ), "The parallel_sample_num should be the same for all samples in sample params."

        if self.parallel_sample_num > 1 and self.is_single:
            self.is_single = False
            if self.text is not None:
                self.text = [self.text]
            if self.input_ids is not None:
                self.input_ids = [self.input_ids]

        # Fill in default arguments
        if self.is_single:
            if self.sampling_params is None:
                self.sampling_params = {}
            if self.rid is None:
                self.rid = uuid.uuid4().hex
            if self.return_logprob is None:
                self.return_logprob = False
            if self.logprob_start_len is None:
                self.logprob_start_len = -1
            if self.top_logprobs_num is None:
                self.top_logprobs_num = 0
        else:
            if self.parallel_sample_num == 1:
                num = self.batch_size
            else:
                # Expand parallel_sample_num
                num = self.batch_size * self.parallel_sample_num

            if self.image_data is None:
                self.image_data = [None] * num
            elif not isinstance(self.image_data, list):
                self.image_data = [self.image_data] * num
            elif isinstance(self.image_data, list):
                pass

            if self.sampling_params is None:
                self.sampling_params = [{}] * num
            elif not isinstance(self.sampling_params, list):
                self.sampling_params = [self.sampling_params] * num

            if self.rid is None:
                self.rid = [uuid.uuid4().hex for _ in range(num)]
            else:
                assert isinstance(self.rid, list), "The rid should be a list."

            if self.return_logprob is None:
                self.return_logprob = [False] * num
            elif not isinstance(self.return_logprob, list):
                self.return_logprob = [self.return_logprob] * num
            else:
                assert self.parallel_sample_num == 1

            if self.logprob_start_len is None:
                self.logprob_start_len = [-1] * num
            elif not isinstance(self.logprob_start_len, list):
                self.logprob_start_len = [self.logprob_start_len] * num
            else:
                assert self.parallel_sample_num == 1

            if self.top_logprobs_num is None:
                self.top_logprobs_num = [0] * num
            elif not isinstance(self.top_logprobs_num, list):
                self.top_logprobs_num = [self.top_logprobs_num] * num
            else:
                assert self.parallel_sample_num == 1

    def regenerate_rid(self):
        self.rid = uuid.uuid4().hex
        return self.rid

    def __getitem__(self, i):
        return GenerateReqInput(
            text=self.text[i] if self.text is not None else None,
            input_ids=self.input_ids[i] if self.input_ids is not None else None,
            image_data=self.image_data[i],
            sampling_params=self.sampling_params[i],
            rid=self.rid[i],
            return_logprob=self.return_logprob[i],
            logprob_start_len=self.logprob_start_len[i],
            top_logprobs_num=self.top_logprobs_num[i],
            return_text_in_logprobs=self.return_text_in_logprobs,
            stream=self.stream,
            modalities=self.modalities[i] if self.modalities else None,
            lora_path=self.lora_path[i] if self.lora_path is not None else None,
        )


@dataclass
class TokenizedGenerateReqInput:
    # The request id
    rid: str
    # The input text
    input_text: str
    # The input token ids
    input_ids: List[int]
    # The image inputs
    image_inputs: dict
    # The sampling parameters
    sampling_params: SamplingParams
    # Whether to return the logprobs
    return_logprob: bool
    # If return logprobs, the start location in the prompt for returning logprobs.
    logprob_start_len: int
    # If return logprobs, the number of top logprobs to return at each position.
    top_logprobs_num: int
    # Whether to stream output
    stream: bool

    # LoRA related
    lora_path: Optional[str] = None  # None means just use the base model
    # The input embeds
    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None

    # Session info for continual prompting
    session_params: Optional[SessionParams] = None


@dataclass
class EmbeddingReqInput:
    # The input prompt. It can be a single prompt or a batch of prompts.
    text: Optional[Union[List[str], str]] = None
    # The token ids for text; one can either specify text or input_ids.
    input_ids: Optional[Union[List[List[int]], List[int]]] = None
    # The request id.
    rid: Optional[Union[List[str], str]] = None
    # Dummy sampling params for compatibility
    sampling_params: Union[List[Dict], Dict] = None
    # Dummy input embeds for compatibility
    input_embeds: Optional[Union[List[List[List[float]]], List[List[float]]]] = None

    def normalize_batch_and_arguments(self):
        if (self.text is None and self.input_ids is None) or (
            self.text is not None and self.input_ids is not None
        ):
            raise ValueError("Either text or input_ids should be provided.")

        # Derive the batch size
        if self.text is not None:
            if isinstance(self.text, str):
                self.is_single = True
                self.batch_size = 1
            else:
                self.is_single = False
                self.batch_size = len(self.text)
        else:
            if isinstance(self.input_ids[0], int):
                self.is_single = True
                self.batch_size = 1
            else:
                self.is_single = False
                self.batch_size = len(self.input_ids)

        # Fill in default arguments
        if self.is_single:
            if self.rid is None:
                self.rid = uuid.uuid4().hex
            if self.sampling_params is None:
                self.sampling_params = {}
            self.sampling_params["max_new_tokens"] = 0
        else:
            if self.rid is None:
                self.rid = [uuid.uuid4().hex for _ in range(self.batch_size)]
            else:
                assert isinstance(self.rid, list), "The rid should be a list."

            if self.sampling_params is None:
                self.sampling_params = [{}] * self.batch_size
            for i in range(self.batch_size):
                self.sampling_params[i]["max_new_tokens"] = 0

    def regenerate_rid(self):
        self.rid = uuid.uuid4().hex
        return self.rid

    def __getitem__(self, i):
        return EmbeddingReqInput(
            text=self.text[i] if self.text is not None else None,
            input_ids=self.input_ids[i] if self.input_ids is not None else None,
            sampling_params=self.sampling_params[i],
            rid=self.rid[i],
        )


@dataclass
class TokenizedEmbeddingReqInput:
    # The request id
    rid: str
    # The input text
    input_text: str
    # The input token ids
    input_ids: List[int]
    # Dummy sampling params for compatibility
    sampling_params: SamplingParams


@dataclass
class BatchTokenIDOut:
    # The request id
    rids: List[str]
    # The finish reason
    finished_reasons: List[BaseFinishReason]
    # For incremental decoding
    # The version id to sync decode status with in detokenizer_manager
    vids: List[int]
    decoded_texts: List[str]
    decode_ids: List[int]
    read_offsets: List[int]
    # Only used when --return-token-ids` is set
    origin_input_ids: Optional[List[int]]
    # Only used when `--skip-tokenizer-init` or `--return-token-ids` is set
    output_ids: Optional[List[int]]
    # Detokenization configs
    skip_special_tokens: List[bool]
    spaces_between_special_tokens: List[bool]
    no_stop_trim: List[bool]
    # Token counts
    prompt_tokens: List[int]
    completion_tokens: List[int]
    cached_tokens: List[int]
    # Logprobs
    input_token_logprobs_val: List[float]
    input_token_logprobs_idx: List[int]
    output_token_logprobs_val: List[float]
    output_token_logprobs_idx: List[int]
    input_top_logprobs_val: List[List]
    input_top_logprobs_idx: List[List]
    output_top_logprobs_val: List[List]
    output_top_logprobs_idx: List[List]
    normalized_prompt_logprob: List[float]


@dataclass
class BatchStrOut:
    # The request id
    rids: List[str]
    # The finish reason
    finished_reasons: List[dict]
    # The output decoded strings
    output_strs: List[str]

    # The token ids
    origin_input_ids: Optional[List[int]]
    output_ids: Optional[List[int]]

    # Token counts
    # real input and output tokens can be get from
    # origin_input_ids and output_ids by enabling --return_token_ids
    # TODO (Shuai): Rename this to clarify the meaning.
    prompt_tokens: List[int]
    completion_tokens: List[int]
    cached_tokens: List[int]

    # Logprobs
    input_token_logprobs_val: List[float]
    input_token_logprobs_idx: List[int]
    output_token_logprobs_val: List[float]
    output_token_logprobs_idx: List[int]
    input_top_logprobs_val: List[List]
    input_top_logprobs_idx: List[List]
    output_top_logprobs_val: List[List]
    output_top_logprobs_idx: List[List]
    normalized_prompt_logprob: List[float]


@dataclass
class BatchEmbeddingOut:
    # The request id
    rids: List[str]
    # The finish reason
    finished_reasons: List[BaseFinishReason]
    # The output embedding
    embeddings: List[List[float]]
    # Token counts
    prompt_tokens: List[int]


@dataclass
class FlushCacheReq:
    pass


@dataclass
class UpdateWeightFromDiskReqInput:
    # The model path with the new weights
    model_path: str
    # The format to load the weights
    load_format: Optional[str] = None


@dataclass
class UpdateWeightFromDiskReqOutput:
    success: bool
    message: str


@dataclass
class UpdateWeightsFromDistributedReqInput:
    name: str
    dtype: str
    shape: List[int]


@dataclass
class UpdateWeightsFromDistributedReqOutput:
    success: bool
    message: str


@dataclass
class UpdateWeightsFromTensorReqInput:
    serialized_named_tensors: bytes  # indeed Dict[str, torch.Tensor]


@dataclass
class UpdateWeightsFromTensorReqOutput:
    success: bool
    message: str


@dataclass
class InitWeightsUpdateGroupReqInput:
    # The master address
    master_address: str
    # The master port
    master_port: int
    # The rank offset
    rank_offset: int
    # The world size
    world_size: int
    # The group name
    group_name: str = "weight_update_group"
    # The backend
    backend: str = "nccl"


@dataclass
class InitWeightsUpdateGroupReqOutput:
    success: bool
    message: str


@dataclass
class GetWeightsByNameReqInput:
    name: str
    truncate_size: int = 100


@dataclass
class GetWeightsByNameReqOutput:
    parameter: list


@dataclass
class AbortReq:
    # The request id
    rid: str


class ProfileReq(Enum):
    START_PROFILE = 1
    STOP_PROFILE = 2


@dataclass
class OpenSessionReqInput:
    capacity_of_str_len: int
    session_id: Optional[str] = None


@dataclass
class CloseSessionReqInput:
    session_id: str


@dataclass
class OpenSessionReqOutput:
    session_id: Optional[str]
    success: bool
