# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# 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.

from __future__ import print_function
import os
os.environ['FLAGS_enable_pir_api'] = '0'
from utils.static_ps.reader_helper_hdfs import get_infer_reader
from utils.static_ps.program_helper import get_model, get_strategy, set_dump_config
from utils.static_ps.metric_helper import set_zero, get_global_auc
from utils.static_ps.common_ps import YamlHelper, is_distributed_env
import argparse
import time
import sys
import paddle.distributed.fleet as fleet
import paddle.distributed.fleet.base.role_maker as role_maker
import paddle
from paddle.base.executor import FetchHandler
import queue
import threading

import warnings
import logging
import ast
import numpy as np
import struct
from utils.utils_single import auc
from utils.oss_client import HangZhouOSSClient
import utils.compress as compress

__dir__ = os.path.dirname(os.path.abspath(__file__))
sys.path.append(os.path.abspath(os.path.join(__dir__, '..')))

root_loger = logging.getLogger()
for handler in root_loger.handlers[:]:
    root_loger.removeHandler(handler)
logging.basicConfig(
    format='%(asctime)s - %(levelname)s - %(message)s', level=logging.INFO)
logger = logging.getLogger(__name__)


import json

class InferenceFetchHandler(FetchHandler):
    def __init__(self, var_dict, output_file, batch_size=1000):
        super().__init__(var_dict=var_dict, period_secs=1)
        self.output_file = output_file
        self.batch_size = batch_size
        self.result_queue = queue.Queue()
        self.writer_thread = threading.Thread(target=self._writer)
        self.writer_thread.daemon = True  # 设置为守护线程
        self.writer_thread.start()
        
        # 创建输出目录（如果不存在）
        output_dir = os.path.dirname(output_file)
        if not os.path.exists(output_dir):
            os.makedirs(output_dir)
        # 创建或清空输出文件
        with open(self.output_file, 'w') as f:
            f.write('')
    
    def handler(self, fetch_vars):
        """处理每批次的推理结果"""
        result_dict = {}

        for key in fetch_vars:
            # 转换数据类型
            if type(fetch_vars[key]) is np.ndarray:
                result = fetch_vars[key][0]
            else:
                result = fetch_vars[key]
            result_dict[key] = result
        self.result_queue.put(result_dict)  # 将结果放入队列
    
    def _writer(self):
        batch = []
        while True:
            try:
                result_dict = self.result_queue.get(timeout=1)  # 非阻塞获取
                logger.info("write vector {}".format(result_dict))
                batch.append(result_dict)
                if len(batch) >= self.batch_size:
                    logger.info("write vector")
                    with open(self.output_file, 'a') as f:
                        for result in batch:
                            f.write(json.dumps(result) + '\n')
                    batch = []
            except queue.Empty:
                pass
    
    def _write_batch(self, batch):
        with open(self.output_file, 'a') as f:
            for result in batch:
                f.write(json.dumps(result) + '\n')

    def flush(self):
        """确保所有结果都被写入文件"""
        # 等待队列中剩余的结果被处理
        self.result_queue.join()
        # 写入最后一批结果
        self._write_batch(self.result_queue.queue)
    


def parse_args():
    parser = argparse.ArgumentParser("PaddleRec train script")
    parser.add_argument("-o", "--opt", nargs='*', type=str)
    parser.add_argument(
        '-m',
        '--config_yaml',
        type=str,
        required=True,
        help='config file path')
    parser.add_argument(
        '-bf16',
        '--pure_bf16',
        type=ast.literal_eval,
        default=False,
        help="whether use bf16")
    args = parser.parse_args()
    args.abs_dir = os.path.dirname(os.path.abspath(args.config_yaml))
    yaml_helper = YamlHelper()
    config = yaml_helper.load_yaml(args.config_yaml)
    # modify config from command
    if args.opt:
        for parameter in args.opt:
            parameter = parameter.strip()
            key, value = parameter.split("=")
            if type(config.get(key)) is int:
                value = int(value)
            if type(config.get(key)) is float:
                value = float(value)
            if type(config.get(key)) is bool:
                value = (True if value.lower() == "true" else False)
            config[key] = value
    config["yaml_path"] = args.config_yaml
    config["config_abs_dir"] = args.abs_dir
    config["pure_bf16"] = args.pure_bf16
    yaml_helper.print_yaml(config)
    return config


def bf16_to_fp32(val):
    return np.float32(struct.unpack('<f', struct.pack('<I', val << 16))[0])


class Main(object):
    def __init__(self, config):
        self.metrics = {}
        self.config = config
        self.input_data = None
        self.reader = None
        self.exe = None
        self.train_result_dict = {}
        self.train_result_dict["speed"] = []
        self.train_result_dict["auc"] = []
        self.model = None
        self.pure_bf16 = self.config['pure_bf16']

    def run(self):
        self.init_fleet_with_gloo()
        self.network()
        if fleet.is_server():
            self.run_server()
        elif fleet.is_worker():
            self.run_worker()
            fleet.stop_worker()
            self.record_result()
        logger.info("Run Success, Exit.")

    def init_fleet_with_gloo(self,use_gloo=True):
        if use_gloo:
            os.environ["PADDLE_WITH_GLOO"] = "0"
            role = role_maker.PaddleCloudRoleMaker(
                is_collective=False,
                init_gloo=False
            )
            fleet.init(role)
        else:
            fleet.init()



    def network(self):
        self.model = get_model(self.config)
        self.input_data = self.model.create_feeds(is_infer=True)
        self.inference_feed_var = self.input_data
        self.init_reader()
        self.metrics = self.model.net(self.inference_feed_var,is_infer=True)
        self.inference_target_var = self.model.inference_target_var
        logger.info("cpu_num: {}".format(os.getenv("CPU_NUM")))
        self.model.create_optimizer(get_strategy(self.config),is_infer=True)

    def run_server(self):
        logger.info("Run Server Begin")
        fleet.init_server(config.get("runner.warmup_model_path"))
        fleet.run_server()

    def run_worker(self):
        logger.info("Run Worker Begin")
        use_cuda = int(config.get("runner.use_gpu"))
        use_auc = config.get("runner.infer_use_auc", False)
        place = paddle.CUDAPlace(0) if use_cuda else paddle.CPUPlace()
        self.exe = paddle.static.Executor(place)

        with open("./{}_worker_main_program.prototxt".format(
                fleet.worker_index()), 'w+') as f:
            f.write(str(paddle.static.default_main_program()))
        with open("./{}_worker_startup_program.prototxt".format(
                fleet.worker_index()), 'w+') as f:
            f.write(str(paddle.static.default_startup_program()))

        self.exe.run(paddle.static.default_startup_program())
        if self.pure_bf16:
            self.model.optimizer.amp_init(self.exe.place)
        fleet.init_worker()

        init_model_path = config.get("runner.infer_load_path")
        model_mode = config.get("runner.model_mode", 0)
        client = HangZhouOSSClient("art-recommend")
        oss_object_name = self.config.get("runner.oss_object_name", "dyp/model.tar.gz")
        client.get_object_to_file(oss_object_name, "model.tar.gz")
        compress.uncompress_tar("model.tar.gz", init_model_path)
        assert os.path.exists(init_model_path)

        #if fleet.is_first_worker():
        #fleet.load_inference_model(init_model_path, mode=int(model_mode))
        #fleet.barrier_worker()


        reader_type = self.config.get("runner.reader_type", "QueueDataset")
        epochs = int(self.config.get("runner.epochs"))
        sync_mode = self.config.get("runner.sync_mode")
        opt_info = paddle.static.default_main_program()._fleet_opt
        if use_auc is True:
            opt_info['stat_var_names'] = [
                self.model.stat_pos.name, self.model.stat_neg.name
            ]
        else:
            opt_info['stat_var_names'] = []

        if reader_type == "InmemoryDataset":
            self.reader.load_into_memory()

        fleet.load_inference_model(
            init_model_path,
            mode=int(model_mode))
        epoch_start_time = time.time()
        epoch = 0
        if sync_mode == "heter":
            self.heter_train_loop(epoch)
        elif reader_type == "QueueDataset":
            self.dataset_train_loop(epoch)
        elif reader_type == "InmemoryDataset":
            self.dataset_train_loop(epoch)

        epoch_time = time.time() - epoch_start_time
        logger.info(
            "using time {} second, ips  {}/sec.".format(epoch_time, self.count_method))
        while True:
            time.sleep(300)
            continue;
        if reader_type == "InmemoryDataset":
            self.reader.release_memory()

    def init_reader(self):
        if fleet.is_server():
            return
        self.config["runner.reader_type"] = self.config.get(
            "runner.reader_type", "QueueDataset")
        self.reader, self.file_list = get_infer_reader(self.input_data, config)
        self.example_nums = 0
        self.count_method = self.config.get("runner.example_count_method",
                                            "example")

    def dataset_train_loop(self, epoch=0):
        logger.info("Epoch: {}, Running Dataset Begin.".format(epoch))

        fetch_info = [
            "Epoch {} Var {}".format(epoch, var_name)
            for var_name in self.metrics
        ]

        fetch_vars = [var for _, var in self.metrics.items()]

        print_step = int(config.get("runner.print_interval"))

        debug = config.get("runner.dataset_debug", False)
        if config.get("runner.need_dump"):
            debug = True
            dump_fields_path = "{}/{}".format(
                config.get("runner.dump_fields_path"), epoch)
            set_dump_config(paddle.static.default_main_program(), {
                "dump_fields_path": dump_fields_path,
                "dump_fields": config.get("runner.dump_fields")
            })
            
        # 设置输出文件路径
        output_dir = config.get("runner.inference_output_dir", "inference_results")
        output_file = os.path.join(output_dir, f"epoch_{epoch}_results.json")
        
        # 创建处理器实例
        fetch_handler = InferenceFetchHandler(var_dict = self.metrics, output_file = output_file)

        print(paddle.static.default_main_program()._fleet_opt)
        self.exe.infer_from_dataset(
            program=paddle.static.default_main_program(),
            dataset=self.reader,
            fetch_list=fetch_vars,
            fetch_info=fetch_info,
            print_period=print_step,
            debug=debug,
            fetch_handler=fetch_handler)
        fetch_handler.flush()


    def heter_train_loop(self, epoch):
        logger.info(
            "Epoch: {}, Running Begin. Check running metrics at heter_log".
            format(epoch))
        reader_type = self.config.get("runner.reader_type")
        if reader_type == "QueueDataset":
            self.exe.infer_from_dataset(
                program=paddle.static.default_main_program(),
                dataset=self.reader,
                debug=config.get("runner.dataset_debug"))
        elif reader_type == "DataLoader":
            batch_id = 0
            train_run_cost = 0.0
            total_examples = 0
            self.reader.start()
            while True:
                try:
                    train_start = time.time()
                    # --------------------------------------------------- #
                    self.exe.run(program=paddle.static.default_main_program())
                    # --------------------------------------------------- #
                    train_run_cost += time.time() - train_start
                    total_examples += self.config.get("runner.batch_size")
                    batch_id += 1
                    print_step = int(config.get("runner.print_period"))
                    if batch_id % print_step == 0:
                        profiler_string = ""
                        profiler_string += "avg_batch_cost: {} sec, ".format(
                            format((train_run_cost) / print_step, '.5f'))
                        profiler_string += "avg_samples: {}, ".format(
                            format(total_examples / print_step, '.5f'))
                        profiler_string += "ips: {} {}/sec ".format(
                            format(total_examples / (train_run_cost), '.5f'),
                            self.count_method)
                        logger.info("Epoch: {}, Batch: {}, {}".format(
                            epoch, batch_id, profiler_string))
                        train_run_cost = 0.0
                        total_examples = 0
                except paddle.core.EOFException:
                    self.reader.reset()
                    break

    def record_result(self):
        logger.info("train_result_dict: {}".format(self.train_result_dict))
        with open("./train_result_dict.txt", 'w+') as f:
            f.write(str(self.train_result_dict))


if __name__ == "__main__":
    paddle.enable_static()

    config = parse_args()
    os.environ["CPU_NUM"] = str(config.get("runner.thread_num"))
    benchmark_main = Main(config)

    benchmark_main.run()