#
# Copyright 2016 The BigDL Authors.
#
# 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 code is copied from llama2 example test, and added performance test
import torch
import time

import numpy as np
from datetime import date

import os
current_dir = os.path.dirname(os.path.realpath(__file__))
benchmark_util_path = os.path.join(current_dir, '..')
import sys
sys.path.append(benchmark_util_path)
from benchmark_util import BenchmarkWrapper
from bigdl.llm.utils.common.log4Error import invalidInputError

results = []


def run_model(repo_id, test_api, in_out_pairs, local_model_hub=None, warm_up=1, num_trials=3):
    # TODO: make a parameter
    if test_api == 'transformer_int4':
        result = run_transformer_int4(repo_id, local_model_hub, in_out_pairs, warm_up, num_trials)
    elif test_api == 'native_int4':
        run_native_int4(repo_id, local_model_hub, in_out_pairs, warm_up, num_trials)
    elif test_api == 'optimize_model':
        result = run_optimize_model(repo_id, local_model_hub, in_out_pairs, warm_up, num_trials)
    elif test_api == 'transformer_int4_gpu':
        result = run_transformer_int4_gpu(repo_id, local_model_hub, in_out_pairs, warm_up, num_trials)
    elif test_api == 'optimize_model_gpu':
        result = run_optimize_model_gpu(repo_id, local_model_hub, in_out_pairs, warm_up, num_trials)

    for in_out_pair in in_out_pairs:
        results.append([repo_id,
                        np.mean(result[in_out_pair], axis=0)[0],
                        np.mean(result[in_out_pair], axis=0)[1],
                        np.mean(result[in_out_pair], axis=0)[2],
                        in_out_pair])

def get_model_path(repo_id, local_model_hub):
    if local_model_hub:
        repo_model_name = repo_id.split("/")[1]
        return local_model_hub + os.path.sep + repo_model_name
    else:
        return repo_id


def run_native_int4(repo_id,
                    local_model_hub,
                    in_out_pairs,
                    warm_up,
                    num_trials):
    model_path = get_model_path(repo_id, local_model_hub)
    from bigdl.llm.transformers import BigdlNativeForCausalLM
    from bigdl.llm import llm_convert
    if "chatglm" in repo_id.lower():
        family = "chatglm"
    elif "llama" in repo_id.lower():
        family = "llama"
    else:
        invalidInputError(False, "Model family unknown: " + repo_id)

    bigdl_llm_path = llm_convert(model=model_path,
                                 outfile="./", outtype='int4', model_family=family)
    for in_out in in_out_pairs:
        in_out_len = in_out.split("-")
        in_len = int(in_out_len[0])
        out_len = int(in_out_len[1])
        input_str = open(f"prompt/{in_len}.txt", 'r').read()
        # As different tokenizer has different encodings,
        # slice the input_ids to ensure the prompt length is required length.
        n_ctx = in_len + out_len if in_len + out_len > 512 else 512
        for i in range(num_trials + warm_up):
            model = BigdlNativeForCausalLM.from_pretrained(bigdl_llm_path, model_family=family, n_ctx=n_ctx)
            input_ids = model.tokenize(input_str)
            input_ids = input_ids[:in_len]
            true_input = model.batch_decode(input_ids)
            st = time.perf_counter()
            output = model(true_input, max_tokens=out_len)
            end = time.perf_counter()
            print("model generate cost: " + str(end - st))
            print(output)

    os.remove(bigdl_llm_path)


def run_transformer_int4(repo_id,
                         local_model_hub,
                         in_out_pairs,
                         warm_up,
                         num_trials):
    from bigdl.llm.transformers import AutoModel, AutoModelForCausalLM
    from transformers import AutoTokenizer

    model_path = get_model_path(repo_id, local_model_hub)
    # Load model in 4 bit,
    # which convert the relevant layers in the model into INT4 format
    st = time.perf_counter()
    if repo_id in ['THUDM/chatglm-6b', 'THUDM/chatglm2-6b']:
        model = AutoModel.from_pretrained(model_path, load_in_4bit=True, trust_remote_code=True, torch_dtype='auto')
        tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
    else:
        model = AutoModelForCausalLM.from_pretrained(model_path, load_in_4bit=True)
        tokenizer = AutoTokenizer.from_pretrained(model_path)
    end = time.perf_counter()
    print(">> loading of model costs {}s".format(end - st))

    model = BenchmarkWrapper(model)

    result = {}
    with torch.inference_mode():
        for in_out in in_out_pairs:
            in_out_len = in_out.split("-")
            in_len = int(in_out_len[0])
            out_len = int(in_out_len[1])
            input_str = open(f"prompt/{in_len}.txt", 'r').read()
            # As different tokenizer has different encodings,
            # slice the input_ids to ensure the prompt length is required length.
            input_ids = tokenizer.encode(input_str, return_tensors="pt")
            input_ids = input_ids[:, :in_len]
            true_str = tokenizer.batch_decode(input_ids)[0]
            input_ids = tokenizer.encode(true_str, return_tensors="pt")
            result[in_out] = []
            for i in range(num_trials + warm_up):
                st = time.perf_counter()
                output_ids = model.generate(input_ids, do_sample=False, max_new_tokens=out_len)
                end = time.perf_counter()
                print("model generate cost: " + str(end - st))
                output = tokenizer.batch_decode(output_ids)
                print(output[0])
                if i >= warm_up:
                    result[in_out].append([model.first_cost, model.rest_cost_mean, model.encoder_time])
    return result


def run_optimize_model(repo_id,
                       local_model_hub,
                       in_out_pairs,
                       warm_up,
                       num_trials):
    from transformers import AutoModel, AutoModelForCausalLM, AutoTokenizer
    from bigdl.llm import optimize_model

    model_path = get_model_path(repo_id, local_model_hub)
    # Load model in 4 bit,
    # which convert the relevant layers in the model into INT4 format
    st = time.perf_counter()
    if repo_id in ['THUDM/chatglm-6b', 'THUDM/chatglm2-6b']:
        model = AutoModel.from_pretrained(model_path, torch_dtype='auto', low_cpu_mem_usage=True, trust_remote_code=True)
        model = optimize_model(model)
        tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
    else:
        model = AutoModelForCausalLM.from_pretrained(model_path, torch_dtype='auto', low_cpu_mem_usage=True)
        model = optimize_model(model)
        tokenizer = AutoTokenizer.from_pretrained(model_path)
    end = time.perf_counter()
    print(">> loading of model costs {}s".format(end - st))

    model = BenchmarkWrapper(model)

    result = {}
    with torch.inference_mode():
        for in_out in in_out_pairs:
            in_out_len = in_out.split("-")
            in_len = int(in_out_len[0])
            out_len = int(in_out_len[1])
            input_str = open(f"prompt/{in_len}.txt", 'r').read()
            # As different tokenizer has different encodings,
            # slice the input_ids to ensure the prompt length is required length.
            input_ids = tokenizer.encode(input_str, return_tensors="pt")
            input_ids = input_ids[:, :in_len]
            true_str = tokenizer.batch_decode(input_ids)[0]
            input_ids = tokenizer.encode(true_str, return_tensors="pt")
            result[in_out] = []
            for i in range(num_trials + warm_up):
                st = time.perf_counter()
                output_ids = model.generate(input_ids, do_sample=False, max_new_tokens=out_len)
                end = time.perf_counter()
                print("model generate cost: " + str(end - st))
                output = tokenizer.batch_decode(output_ids)
                print(output[0])
                if i >= warm_up:
                    result[in_out].append([model.first_cost, model.rest_cost_mean, model.encoder_time])
    return result


def run_transformer_int4_gpu(repo_id,
                             local_model_hub,
                             in_out_pairs,
                             warm_up,
                             num_trials):
    from bigdl.llm.transformers import AutoModel, AutoModelForCausalLM
    from transformers import AutoTokenizer
    import intel_extension_for_pytorch as ipex
    if local_model_hub:
        repo_model_name = repo_id.split("/")[1]
        model_path = local_model_hub + "/" + repo_model_name
    else:
        model_path = repo_id
    # Load model in 4 bit,
    # which convert the relevant layers in the model into INT4 format
    st = time.perf_counter()
    if repo_id in ['THUDM/chatglm-6b', 'THUDM/chatglm2-6b']:
        model = AutoModel.from_pretrained(model_path, load_in_4bit=True, optimize_model=True, trust_remote_code=True)
        model = model.to('xpu')
        tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
    else:
        model = AutoModelForCausalLM.from_pretrained(model_path, optimize_model=True, load_in_4bit=True)
        model = model.to('xpu')
        tokenizer = AutoTokenizer.from_pretrained(model_path)
    end = time.perf_counter()
    print(">> loading of model costs {}s".format(end - st))

    model = BenchmarkWrapper(model)

    result = {}
    with torch.inference_mode():
        for in_out in in_out_pairs:
            in_out_len = in_out.split("-")
            in_len = int(in_out_len[0])
            out_len = int(in_out_len[1])
            input_str = open(f"prompt/{in_len}.txt", 'r').read()
            # As different tokenizer has different encodings,
            # slice the input_ids to ensure the prompt length is required length.
            input_ids = tokenizer.encode(input_str, return_tensors="pt").to('xpu')
            input_ids = input_ids[:, :in_len]
            result[in_out] = []
            for i in range(num_trials + warm_up):
                st = time.perf_counter()
                output_ids = model.generate(input_ids, do_sample=False, max_new_tokens=out_len)
                torch.xpu.synchronize()
                end = time.perf_counter()
                output_ids = output_ids.cpu()
                print("model generate cost: " + str(end - st))
                output = tokenizer.batch_decode(output_ids)
                print(output[0])
                if i >= warm_up:
                    result[in_out].append([model.first_cost, model.rest_cost_mean, model.encoder_time])
    return result


def run_optimize_model_gpu(repo_id,
                           local_model_hub,
                           in_out_pairs,
                           warm_up,
                           num_trials):
    from transformers import AutoModel, AutoModelForCausalLM, AutoTokenizer
    from bigdl.llm import optimize_model
    import intel_extension_for_pytorch as ipex
    if local_model_hub:
        repo_model_name = repo_id.split("/")[1]
        model_path = local_model_hub + "/" + repo_model_name
    else:
        model_path = repo_id
    # Load model in 4 bit,
    # which convert the relevant layers in the model into INT4 format
    st = time.perf_counter()
    if repo_id in ['THUDM/chatglm-6b', 'THUDM/chatglm2-6b']:
        model = AutoModel.from_pretrained(model_path, torch_dtype='auto', low_cpu_mem_usage=True, trust_remote_code=True)
        model = optimize_model(model)
        model = model.to('xpu')
        tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True)
    else:
        model = AutoModelForCausalLM.from_pretrained(model_path, torch_dtype='auto', low_cpu_mem_usage=True)
        model = optimize_model(model)
        model = model.to('xpu')
        tokenizer = AutoTokenizer.from_pretrained(model_path)
    end = time.perf_counter()
    print(">> loading of model costs {}s".format(end - st))

    model = BenchmarkWrapper(model)

    result = {}
    with torch.inference_mode():
        for in_out in in_out_pairs:
            in_out_len = in_out.split("-")
            in_len = int(in_out_len[0])
            out_len = int(in_out_len[1])
            input_str = open(f"prompt/{in_len}.txt", 'r').read()
            # As different tokenizer has different encodings,
            # slice the input_ids to ensure the prompt length is required length.
            input_ids = tokenizer.encode(input_str, return_tensors="pt").to('xpu')
            input_ids = input_ids[:, :in_len]
            result[in_out] = []
            for i in range(num_trials + warm_up):
                st = time.perf_counter()
                output_ids = model.generate(input_ids, do_sample=False, max_new_tokens=out_len)
                torch.xpu.synchronize()
                end = time.perf_counter()
                output_ids = output_ids.cpu()
                print("model generate cost: " + str(end - st))
                output = tokenizer.batch_decode(output_ids)
                print(output[0])
                if i >= warm_up:
                    result[in_out].append([model.first_cost, model.rest_cost_mean, model.encoder_time])
    return result


if __name__ == '__main__':
    from omegaconf import OmegaConf
    conf = OmegaConf.load(f'{current_dir}/config.yaml')
    today = date.today()
    
    import pandas as pd
    for api in conf.test_api:
        for model in conf.repo_id:
            run_model(model, api, conf['in_out_pairs'], conf['local_model_hub'], conf['warm_up'], conf['num_trials'])
        df = pd.DataFrame(results, columns=['model', '1st token avg latency (s)', '2+ avg latency (s/token)', 'encoder time (s)', 'input/output tokens'])
        df.to_csv(f'{current_dir}/{api}-results-{today}.csv')
        results = []