# MIT License
#
# Copyright (c) 2020 Dan Hendrycks
# Copyright (c) 2023 Deep Cognition and Language Research (DeCLaRe) Lab
#
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"""Adapted from https://github.com/declare-lab/instruct-eval
Helper script to compare TRTLLM and HF models on the MMLU dataset.
Example usage:
    mkdir data; wget https://people.eecs.berkeley.edu/~hendrycks/data.tar -O data/mmlu.tar
    tar -xf data/mmlu.tar -C data && mv data/data data/mmlu

    python mmlu.py --hf_model_dir <HF model path> --engine_dir <TRTLLM engine path> --test_trt_llm
    python mmlu.py --hf_model_dir <HF model path> --engine_dir <TRTLLM engine path> --test_hf
"""

import argparse
import os
import random

import numpy as np
import pandas as pd
import torch
import torch.nn as nn
from tqdm import tqdm
from transformers import (AutoConfig, AutoModel, AutoModelForCausalLM,
                          AutoModelForSeq2SeqLM, AutoTokenizer,
                          GenerationConfig)
from utils import (add_common_args, load_tokenizer, prepare_enc_dec_inputs,
                   read_is_enc_dec, read_model_name)

import tensorrt_llm
from tensorrt_llm.runtime import PYTHON_BINDINGS, ModelRunner

if PYTHON_BINDINGS:
    from tensorrt_llm.runtime import ModelRunnerCpp

os.environ["TOKENIZERS_PARALLELISM"] = "false"

DTYPE_STR_MAPPING = {
    "fp32": torch.float32,
    "fp16": torch.float16,
    "bf16": torch.bfloat16,
    "float32": torch.float32,
    "float16": torch.float16,
    "bfloat16": torch.bfloat16,
}
RAND_SEED = 1234


def get_choices():
    return ["A", "B", "C", "D"]


def get_subcategories():
    return {
        "abstract_algebra": ["math"],
        "anatomy": ["health"],
        "astronomy": ["physics"],
        "business_ethics": ["business"],
        "clinical_knowledge": ["health"],
        "college_biology": ["biology"],
        "college_chemistry": ["chemistry"],
        "college_computer_science": ["computer science"],
        "college_mathematics": ["math"],
        "college_medicine": ["health"],
        "college_physics": ["physics"],
        "computer_security": ["computer science"],
        "conceptual_physics": ["physics"],
        "econometrics": ["economics"],
        "electrical_engineering": ["engineering"],
        "elementary_mathematics": ["math"],
        "formal_logic": ["philosophy"],
        "global_facts": ["other"],
        "high_school_biology": ["biology"],
        "high_school_chemistry": ["chemistry"],
        "high_school_computer_science": ["computer science"],
        "high_school_european_history": ["history"],
        "high_school_geography": ["geography"],
        "high_school_government_and_politics": ["politics"],
        "high_school_macroeconomics": ["economics"],
        "high_school_mathematics": ["math"],
        "high_school_microeconomics": ["economics"],
        "high_school_physics": ["physics"],
        "high_school_psychology": ["psychology"],
        "high_school_statistics": ["math"],
        "high_school_us_history": ["history"],
        "high_school_world_history": ["history"],
        "human_aging": ["health"],
        "human_sexuality": ["culture"],
        "international_law": ["law"],
        "jurisprudence": ["law"],
        "logical_fallacies": ["philosophy"],
        "machine_learning": ["computer science"],
        "management": ["business"],
        "marketing": ["business"],
        "medical_genetics": ["health"],
        "miscellaneous": ["other"],
        "moral_disputes": ["philosophy"],
        "moral_scenarios": ["philosophy"],
        "nutrition": ["health"],
        "philosophy": ["philosophy"],
        "prehistory": ["history"],
        "professional_accounting": ["other"],
        "professional_law": ["law"],
        "professional_medicine": ["health"],
        "professional_psychology": ["psychology"],
        "public_relations": ["politics"],
        "security_studies": ["politics"],
        "sociology": ["culture"],
        "us_foreign_policy": ["politics"],
        "virology": ["health"],
        "world_religions": ["philosophy"],
    }


def get_categories():
    return {
        "STEM": [
            "physics",
            "chemistry",
            "biology",
            "computer science",
            "math",
            "engineering",
        ],
        "humanities": ["history", "philosophy", "law"],
        "social sciences": [
            "politics",
            "culture",
            "economics",
            "geography",
            "psychology",
        ],
        "other (business, health, misc.)": ["other", "business", "health"],
    }


def format_subject(subject):
    line = subject.split("_")
    s = ""
    for entry in line:
        s += " " + entry
    return s


def format_example(df, idx, include_answer=True):
    prompt = df.iloc[idx, 0]
    k = df.shape[1] - 2
    for j in range(k):
        prompt += "\n{}. {}".format(get_choices()[j], df.iloc[idx, j + 1])
    prompt += "\nAnswer:"
    if include_answer:
        prompt += " {}\n\n".format(df.iloc[idx, k + 1])
    return prompt


def gen_prompt(train_df, subject, k=-1):
    prompt = "The following are multiple choice questions (with answers) about {}.\n\n".format(
        format_subject(subject))
    if k == -1:
        k = train_df.shape[0]
    for i in range(k):
        prompt += format_example(train_df, i)
    return prompt


def evaluate(args, subject, pipeline, dev_df, test_df):
    rank = tensorrt_llm.mpi_rank()
    cors = []
    all_probs = []
    for i in range(test_df.shape[0]):
        if i >= args.max_ite:
            break
        # get prompt and make sure it fits
        k = args.ntrain
        prompt_end = format_example(test_df, i, include_answer=False)
        train_prompt = gen_prompt(dev_df, subject, k)
        prompt = train_prompt + prompt_end

        while not pipeline.check_valid_length(prompt) and k > 0:
            k -= 1
            train_prompt = gen_prompt(dev_df, subject, k)
            prompt = train_prompt + prompt_end

        label = test_df.iloc[i, test_df.shape[1] - 1]
        pred = pipeline(prompt)

        if rank == 0:
            probs = [0 for _ in get_choices()]
            cor = pred.strip().startswith(label)
            cors.append(cor)
            all_probs.append(probs)

    if rank == 0:
        acc = np.mean(cors)
        cors = np.array(cors)

        all_probs = np.array(all_probs)
        print("Average accuracy {:.3f} - {}".format(acc, subject))

        return cors, acc, all_probs
    else:
        return None, 0, None


def get_tokenizer(ckpt_path, max_seq_len):
    print(f"Initializing tokenizer from {ckpt_path}")
    tokenizer = AutoTokenizer.from_pretrained(
        ckpt_path,
        model_max_length=max_seq_len,
        padding_side="left",
        trust_remote_code=True,
    )
    tokenizer.pad_token = tokenizer.eos_token

    return tokenizer


class Pipeline:

    def __init__(self, tokenizer, model, model_name, pad_id, end_id,
                 max_attention_window_size, is_enc_dec, hf_model_dir,
                 engine_dir):
        self.tokenizer = tokenizer
        self.model = model
        self.model_name = model_name
        self.pad_id = pad_id
        self.end_id = end_id
        self.max_attention_window_size = max_attention_window_size
        self.output_len = 2
        self.is_enc_dec = is_enc_dec
        self.decoder_start_token_id = None
        self.engine_dir = engine_dir
        if self.is_enc_dec:
            self.decoder_start_token_id = AutoConfig.from_pretrained(
                hf_model_dir).decoder_start_token_id

    def __call__(self, prompt):
        rank = tensorrt_llm.mpi_rank()
        # Run the model in batch size 1 and beam size 1
        inputs = self.tokenizer.encode(prompt, return_tensors="pt").squeeze(0)
        batch_input_ids = [inputs]

        # For multi-choice tasks like MMLU, we don't need to adjust following parameters
        output_len = self.output_len
        top_k = 1
        top_p = 0.0

        input_lengths = [x.size(0) for x in batch_input_ids]

        with torch.no_grad():
            if isinstance(self.model, nn.Module):
                # Left padding for HF
                max_length = max(input_lengths)
                paddings = [
                    torch.ones(max_length - l, dtype=torch.int32) * self.pad_id
                    for l in input_lengths
                ]
                batch_input_ids = [
                    torch.cat([pad, x])
                    for x, pad in zip(batch_input_ids, paddings)
                ]
                batch_input_ids = torch.stack(batch_input_ids)
                batch_input_ids = batch_input_ids.cuda()
                if self.is_enc_dec:
                    batch_decoder_input_ids = torch.IntTensor(
                        [[self.decoder_start_token_id]]).to('cuda')
                    batch_decoder_input_ids = batch_decoder_input_ids.repeat(
                        (batch_input_ids.shape[0], 1))

                with torch.no_grad():
                    # Use default temperature and top_k
                    outputs = self.model.generate(
                        batch_input_ids,
                        max_new_tokens=output_len,
                        top_k=top_k,
                        decoder_input_ids=batch_decoder_input_ids
                        if self.is_enc_dec else None)
                    if not self.is_enc_dec:
                        output_ids = outputs[0, input_lengths[0]:]
                    else:
                        output_ids = outputs[0]

            elif isinstance(self.model, ModelRunnerCpp) or isinstance(
                    self.model, ModelRunner):
                if self.is_enc_dec:
                    encoder_input_ids, encoder_input_features, encoder_output_lengths, decoder_input_ids = prepare_enc_dec_inputs(
                        batch_input_ids, self.model_name, self.engine_dir, None)

                outputs = self.model.generate(
                    batch_input_ids=decoder_input_ids
                    if self.is_enc_dec else batch_input_ids,
                    encoder_input_ids=encoder_input_ids
                    if self.is_enc_dec else None,
                    encoder_input_features=encoder_input_features
                    if self.is_enc_dec else None,
                    encoder_output_lengths=encoder_output_lengths
                    if self.is_enc_dec else None,
                    max_new_tokens=output_len,
                    max_attention_window_size=self.max_attention_window_size,
                    end_id=self.end_id,
                    pad_id=self.pad_id,
                    top_k=top_k,
                    top_p=top_p,
                )
                torch.cuda.synchronize()
                if rank == 0:
                    if not self.is_enc_dec:
                        output_ids = outputs[0, 0, input_lengths[0]:]
                    else:
                        output_ids = outputs[0, 0]
        if rank == 0:
            return self.tokenizer.decode(output_ids, skip_special_tokens=True)
        else:
            return None

    def check_valid_length(self, prompt):
        if isinstance(self.model, nn.Module):
            return True
        input_len = len(self.tokenizer.encode(prompt))
        return input_len <= self.model.max_input_len and input_len + self.output_len <= self.model.max_seq_len


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--data_dir",
        type=str,
        default="data/mmlu",
        help=("Path to the data directory. If not available, "
              "download https://people.eecs.berkeley.edu/~hendrycks/data.tar"),
    )
    parser.add_argument("--ntrain", type=int, default=5)
    parser.add_argument("--max_input_length", type=int, default=2048)
    parser.add_argument("--test_trt_llm", action="store_true")
    parser.add_argument("--test_hf", action="store_true")
    parser.add_argument('--check_accuracy', action='store_true')
    parser.add_argument('--accuracy_threshold', type=float, default=30)
    parser.add_argument('--max_ite', type=int, default=10000000)
    parser = add_common_args(parser)

    args = parser.parse_args()

    return args


def main():
    args = parse_args()
    if args.tokenizer_dir is None:
        args.tokenizer_dir = args.hf_model_dir
    random.seed(RAND_SEED)
    np.random.seed(RAND_SEED)
    runtime_rank = tensorrt_llm.mpi_rank()

    os.path.dirname(os.path.abspath(__file__))
    data_fullpath = os.path.join(args.data_dir, "test")

    subjects = sorted([
        f.split("_test.csv")[0] for f in os.listdir(data_fullpath)
        if "_test.csv" in f
    ])

    all_cors = []
    subcat_cors = {
        subcat: []
        for subcat_lists in get_subcategories().values()
        for subcat in subcat_lists
    }
    cat_cors = {cat: [] for cat in get_categories()}

    # different handling if encoder-decoder models
    is_enc_dec = read_is_enc_dec(
        args.engine_dir if not args.test_hf else args.hf_model_dir,
        args.test_hf)

    model_name, model_version = read_model_name(
        (args.engine_dir if not is_enc_dec else os.path.join(
            args.engine_dir, 'encoder'))
        if not args.test_hf else args.hf_model_dir, args.test_hf)

    tokenizer, pad_id, end_id = load_tokenizer(
        tokenizer_dir=args.tokenizer_dir,
        vocab_file=args.vocab_file,
        model_name=model_name,
        model_version=model_version,
    )

    if args.test_trt_llm:
        assert not args.test_hf, "Cannot test both TRT-LLM and HF"
        runner_cls = ModelRunner if not PYTHON_BINDINGS else ModelRunnerCpp
        runner_kwargs = {}
        if PYTHON_BINDINGS:
            runner_kwargs.update(max_beam_width=1)
        runner_kwargs.update(
            is_enc_dec=is_enc_dec,
            max_tokens_in_paged_kv_cache=args.max_tokens_in_paged_kv_cache,
            kv_cache_enable_block_reuse=args.kv_cache_enable_block_reuse,
            kv_cache_free_gpu_memory_fraction=args.
            kv_cache_free_gpu_memory_fraction,
            cross_kv_cache_fraction=args.cross_kv_cache_fraction
            if is_enc_dec else None,
            enable_chunked_context=args.enable_chunked_context,
            multi_block_mode=args.multi_block_mode)
        model = runner_cls.from_dir(engine_dir=args.engine_dir,
                                    rank=runtime_rank,
                                    **runner_kwargs)
    else:
        assert args.test_hf, "Must test either TRT-LLM or HF"
        if 'GLM' in model_name and model_version == 'glm':
            auto_model_cls = AutoModelForSeq2SeqLM
        elif 'GLM' in model_name and model_version == 'chatglm':
            auto_model_cls = AutoModel
        elif is_enc_dec:
            auto_model_cls = AutoModelForSeq2SeqLM
        else:
            auto_model_cls = AutoModelForCausalLM
        model = auto_model_cls.from_pretrained(
            args.hf_model_dir,
            trust_remote_code=True,
            torch_dtype=DTYPE_STR_MAPPING[args.hf_data_type],
            device_map="auto" if args.hf_device_map_auto else None,
        )
        if not args.hf_device_map_auto:
            model.cuda()
        if model_name == "qwen":
            model.generation_config = GenerationConfig.from_pretrained(
                args.hf_model_dir, trust_remote_code=True)

    pipeline = Pipeline(tokenizer, model, model_name, pad_id, end_id,
                        args.max_attention_window_size, is_enc_dec,
                        args.hf_model_dir, args.engine_dir)

    for subject in tqdm(subjects):
        dev_df = pd.read_csv(os.path.join(args.data_dir, "dev",
                                          subject + "_dev.csv"),
                             header=None)[:args.ntrain]
        test_df = pd.read_csv(os.path.join(args.data_dir, "test",
                                           subject + "_test.csv"),
                              header=None)

        cors, acc, probs = evaluate(args, subject, pipeline, dev_df, test_df)
        subcats = get_subcategories()[subject]
        for subcat in subcats:
            subcat_cors[subcat].append(cors)
            for key in get_categories().keys():
                if subcat in get_categories()[key]:
                    cat_cors[key].append(cors)
        all_cors.append(cors)

    if runtime_rank == 0:
        for subcat in subcat_cors:
            acc = np.mean(np.concatenate(subcat_cors[subcat])) * 100
            print(f"Average accuracy {acc:.2f} - {subcat}")

        for cat in cat_cors:
            acc = np.mean(np.concatenate(cat_cors[cat])) * 100
            print(f"Average accuracy {acc:.2f} - {cat}")

        weighted_acc = np.mean(np.concatenate(all_cors)) * 100
        print(f"MMLU weighted average accuracy: {weighted_acc:.2f}")

        if args.check_accuracy:
            assert weighted_acc >= args.accuracy_threshold, f"Expected accuracy >= {args.accuracy_threshold} while got {weighted_acc}"
        return weighted_acc


if __name__ == "__main__":
    main()