# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
# Copyright 2023 The vLLM 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.
# This file is a part of the vllm-ascend project.
#
import hashlib
import json
import logging
import os
import re
import subprocess
import tempfile
from pathlib import Path

import filelock
import huggingface_hub
import pandas as pd
from modelscope import snapshot_download  # type: ignore

BENCHMARK_HOME = os.getenv("BENCHMARK_HOME", os.path.abspath("./benchmark"))
DATASET_CONF_DIR = os.path.join(BENCHMARK_HOME, "ais_bench", "benchmark", "configs", "datasets")
REQUEST_CONF_DIR = os.path.join(BENCHMARK_HOME, "ais_bench", "benchmark", "configs", "models", "vllm_api")
DATASET_DIR = os.path.join(BENCHMARK_HOME, "ais_bench", "datasets")


class AisbenchRunner:
    RESULT_MSG = {"performance": "Performance Result files locate in ", "accuracy": "write csv to "}
    DATASET_RENAME = {"aime2024": "aime", "gsm8k-lite": "gsm8k", "textvqa-lite": "textvqa"}

    def _run_aisbench_task(self):
        dataset_conf = self.dataset_conf.split("/")[-1]
        if self.task_type == "accuracy":
            aisbench_cmd = ["ais_bench", "--models", f"{self.request_conf}_custom", "--datasets", f"{dataset_conf}"]
        if self.task_type == "performance":
            aisbench_cmd = [
                "ais_bench",
                "--models",
                f"{self.request_conf}_custom",
                "--datasets",
                f"{dataset_conf}_custom",
                "--mode",
                "perf",
            ]
            if self.num_prompts:
                aisbench_cmd.extend(["--num-prompts", str(self.num_prompts)])
        print(f"running aisbench cmd: {' '.join(aisbench_cmd)}")
        self.proc: subprocess.Popen = subprocess.Popen(
            aisbench_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True
        )

    def __init__(self, model: str, port: int, aisbench_config: dict, host_ip: str = "localhost", verify=True):
        self.model = model
        self.dataset_path = aisbench_config.get("dataset_path_local")
        if not self.dataset_path:
            self.dataset_path = maybe_download_from_modelscope(aisbench_config["dataset_path"], repo_type="dataset")
        self.model_path = aisbench_config.get("model_path")
        if not self.model_path:
            self.model_path = maybe_download_from_modelscope(model)
        assert self.dataset_path is not None and self.model_path is not None, (
            f"Failed to download dataset or model: dataset={self.dataset_path}, model={self.model_path}"
        )
        self.port = port
        self.host_ip = host_ip
        self.task_type = aisbench_config["case_type"]
        self.request_conf = aisbench_config["request_conf"]
        self.dataset_conf = aisbench_config.get("dataset_conf")
        self.num_prompts = aisbench_config.get("num_prompts")
        self.max_out_len = aisbench_config["max_out_len"]
        self.batch_size = aisbench_config["batch_size"]
        self.request_rate = aisbench_config.get("request_rate", 0)
        self.trust_remote_code = aisbench_config.get("trust_remote_code", False)
        self.temperature = aisbench_config.get("temperature")
        self.top_k = aisbench_config.get("top_k")
        self.top_p = aisbench_config.get("top_p")
        self.seed = aisbench_config.get("seed")
        self.repetition_penalty = aisbench_config.get("repetition_penalty")
        self.exp_folder = None
        self.result_line = None
        self._init_dataset_conf()
        self._init_request_conf()
        self._run_aisbench_task()
        self._wait_for_task()
        if verify:
            self.baseline = aisbench_config.get("baseline", 1)
            if self.task_type == "accuracy":
                self.threshold = aisbench_config.get("threshold", 1)
                self._accuracy_verify()
            if self.task_type == "performance":
                self.threshold = aisbench_config.get("threshold", 0.97)
                self._performance_verify()

    def _init_dataset_conf(self):
        if self.task_type == "accuracy":
            dataset_name = os.path.basename(self.dataset_path)
            dataset_rename = self.DATASET_RENAME.get(dataset_name, "")
            dst_dir = os.path.join(DATASET_DIR, dataset_rename)
            command = ["cp", "-r", self.dataset_path, dst_dir]
            subprocess.call(command)
        if self.task_type == "performance":
            conf_path = os.path.join(DATASET_CONF_DIR, f"{self.dataset_conf}.py")
            if self.dataset_conf.startswith("textvqa"):
                self.dataset_path = os.path.join(self.dataset_path, "textvqa_val.jsonl")
            with open(conf_path, encoding="utf-8") as f:
                content = f.read()
            content = re.sub(r"path=.*", f'path="{self.dataset_path}",', content)
            conf_path_new = os.path.join(DATASET_CONF_DIR, f"{self.dataset_conf}_custom.py")
            with open(conf_path_new, "w", encoding="utf-8") as f:
                f.write(content)

    def _init_request_conf(self):
        conf_path = os.path.join(REQUEST_CONF_DIR, f"{self.request_conf}.py")
        with open(conf_path, encoding="utf-8") as f:
            content = f.read()
        content = re.sub(r"model=.*", f'model="{self.model}",', content)
        content = re.sub(r"host_port.*", f"host_port = {self.port},", content)
        content = re.sub(r"host_ip.*", f'host_ip = "{self.host_ip}",', content)
        content = re.sub(r"max_out_len.*", f"max_out_len = {self.max_out_len},", content)
        content = re.sub(r"batch_size.*", f"batch_size = {self.batch_size},", content)
        content = re.sub(r"trust_remote_code=.*", f"trust_remote_code={self.trust_remote_code},", content)
        content = content.replace("top_k", "#top_k")
        content = content.replace("seed", "#seed")
        content = content.replace("repetition_penalty", "#repetition_penalty")
        if self.task_type == "performance":
            content = re.sub(r"path=.*", f'path="{self.model_path}",', content)
            content = re.sub(r"request_rate.*", f"request_rate = {self.request_rate},", content)
            content = re.sub(r"temperature.*", "temperature = 0,\n            ignore_eos = True,", content)
            content = content.replace("top_p", "#top_p")
        if self.task_type == "accuracy":
            content = re.sub(r"temperature.*", "temperature = 0.6,\n            ignore_eos = False,", content)
        if self.temperature:
            content = re.sub(r"temperature.*", f"temperature = {self.temperature},", content)
        if self.top_p:
            content = re.sub(r"#?top_p.*", f"top_p = {self.top_p},", content)
        if self.top_k:
            content = re.sub(r"#top_k.*", f"top_k = {self.top_k},", content)
        if self.seed:
            content = re.sub(r"#seed.*", f"seed = {self.seed},", content)
        if self.repetition_penalty:
            content = re.sub(r"#repetition_penalty.*", f"repetition_penalty = {self.repetition_penalty},", content)
        conf_path_new = os.path.join(REQUEST_CONF_DIR, f"{self.request_conf}_custom.py")
        with open(conf_path_new, "w", encoding="utf-8") as f:
            f.write(content)
        print(f"The request config is\n {content}")

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        self.proc.terminate()
        try:
            self.proc.wait(8)
        except subprocess.TimeoutExpired:
            # force kill if needed
            self.proc.kill()

    def _wait_for_exp_folder(self):
        while True:
            line = self.proc.stdout.readline().strip()
            print(line)
            if "Current exp folder: " in line:
                self.exp_folder = re.search(r"Current exp folder: (.*)", line).group(1)
                return
            if "ERROR" in line:
                error_msg = f"Some errors happened to Aisbench runtime, the first error is {line}"
                raise RuntimeError(error_msg) from None

    def _wait_for_task(self):
        self._wait_for_exp_folder()
        result_msg = self.RESULT_MSG[self.task_type]
        while True:
            line = self.proc.stdout.readline().strip()
            print(line)
            if result_msg in line:
                self.result_line = line
                return
            if "ERROR" in line:
                error_msg = f"Some errors happened to Aisbench runtime, the first error is {line}"
                raise RuntimeError(error_msg) from None

    def _get_result_performance(self):
        result_dir = re.search(r"Performance Result files locate in (.*)", self.result_line).group(1)[:-1]
        dataset_type = self.dataset_conf.split("/")[0]
        result_csv_file = os.path.join(result_dir, f"{dataset_type}dataset.csv")
        result_json_file = os.path.join(result_dir, f"{dataset_type}dataset.json")
        self.result_csv = pd.read_csv(result_csv_file, index_col=0)
        print("Getting performance results from file: ", result_json_file)
        with open(result_json_file, encoding="utf-8") as f:
            self.result_json = json.load(f)
        self.result = [self.result_csv, self.result_json]

    def _get_result_accuracy(self):
        acc_file = re.search(r"write csv to (.*)", self.result_line).group(1)
        df = pd.read_csv(acc_file)
        self.result = float(df.loc[0][-1])

    def _performance_verify(self):
        self._get_result_performance()
        output_throughput = self.result_json["Output Token Throughput"]["total"].replace("token/s", "")
        assert float(output_throughput) >= self.threshold * self.baseline, (
            "Performance verification failed. "
            f"The current Output Token Throughput is {output_throughput} token/s, "
            f"which is not greater than or equal to {self.threshold} * baseline {self.baseline}."
        )

    def _accuracy_verify(self):
        self._get_result_accuracy()
        acc_value = self.result
        assert self.baseline - self.threshold <= acc_value <= self.baseline + self.threshold, (
            "Accuracy verification failed. "
            f"The accuracy of {self.dataset_path} is {acc_value}, "
            f"which is not within {self.threshold} relative to baseline {self.baseline}."
        )


def run_aisbench_cases(model, port, aisbench_cases, server_args="", host_ip="localhost"):
    aisbench_results = []
    aisbench_errors = []
    for aisbench_case in aisbench_cases:
        if not aisbench_case:
            continue
        try:
            with AisbenchRunner(model=model, port=port, host_ip=host_ip, aisbench_config=aisbench_case) as aisbench:
                aisbench_results.append(aisbench.result)
        except Exception as e:
            aisbench_results.append("")
            aisbench_errors.append([aisbench_case, e])
            print(e)
    for failed_case, error_info in aisbench_errors:
        error_msg = f"The following aisbench case failed: {failed_case}, reason is {error_info}"
        if server_args:
            error_msg += f"\nserver_args are {server_args}"
        logging.error(error_msg)
    assert not aisbench_errors, "some aisbench cases failed, info were shown above."
    return aisbench_results


def get_TTFT(result):
    TTFT = result[0][0].loc["TTFT", "Average"][:-3]
    return float(TTFT)


temp_dir = tempfile.gettempdir()


def get_lock(model_name_or_path: str | Path, cache_dir: str | None = None):
    lock_dir = cache_dir or temp_dir
    model_name_or_path = str(model_name_or_path)
    os.makedirs(os.path.dirname(lock_dir), exist_ok=True)
    model_name = model_name_or_path.replace("/", "-")
    hash_name = hashlib.sha256(model_name.encode()).hexdigest()
    # add hash to avoid conflict with old users' lock files
    lock_file_name = hash_name + model_name + ".lock"
    # mode 0o666 is required for the filelock to be shared across users
    lock = filelock.FileLock(os.path.join(lock_dir, lock_file_name), mode=0o666)
    return lock


def maybe_download_from_modelscope(
    model: str,
    repo_type: str = "model",
    revision: str | None = None,
    download_dir: str | None = None,
    ignore_patterns: str | list[str] | None = None,
    allow_patterns: list[str] | str | None = None,
) -> str:
    """
    Download model/dataset from ModelScope hub.
    Returns the path to the downloaded model, or None if the model is not
    downloaded from ModelScope.
    """
    # Use file lock to prevent multiple processes from
    # downloading the same model weights at the same time.
    with get_lock(model, download_dir):
        if not os.path.exists(model):
            model_path = snapshot_download(
                model_id=model,
                repo_type=repo_type,
                cache_dir=download_dir,
                local_files_only=huggingface_hub.constants.HF_HUB_OFFLINE,
                revision=revision,
                ignore_file_pattern=ignore_patterns,
                allow_patterns=allow_patterns,
            )
        else:
            model_path = model
    return model_path
