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import os
import logging
import functools
import json
import time
from datetime import datetime

from tensorboardX import SummaryWriter
import yaml
import cv2
import numpy as np

from concern.config import Configurable, State


class Logger(Configurable):
    SUMMARY_DIR_NAME = 'summaries'
    VISUALIZE_NAME = 'visualize'
    LOG_FILE_NAME = 'output.log'
    ARGS_FILE_NAME = 'args.log'
    METRICS_FILE_NAME = 'metrics.log'

    database_dir = State(default='./outputs/')
    log_dir = State(default='workspace')
    verbose = State(default=False)
    level = State(default='info')
    log_interval = State(default=100)

    def __init__(self, **kwargs):
        self.load_all(**kwargs)

        self._make_storage()

        cmd = kwargs['cmd']
        self.name = cmd['name']
        self.log_dir = os.path.join(self.log_dir, self.name)
        try:
            self.verbose = cmd['verbose']
        except:
            print('verbose:', self.verbose)
        if self.verbose:
            print('Initializing log dir for', self.log_dir)

        if not os.path.exists(self.log_dir):
            os.makedirs(self.log_dir)

        self.message_logger = self._init_message_logger()

        summary_path = os.path.join(self.log_dir, self.SUMMARY_DIR_NAME)
        self.tf_board_logger = SummaryWriter(summary_path)

        self.metrics_writer = open(os.path.join(
            self.log_dir, self.METRICS_FILE_NAME), 'at')

        self.timestamp = time.time()
        self.logged = -1
        self.speed = None
        self.eta_time = None

    def _make_storage(self):
        application = os.path.basename(os.getcwd())
        storage_dir = os.path.join(
            self.database_dir, self.log_dir, application)
        if not os.path.exists(storage_dir):
            os.makedirs(storage_dir)
        if not os.path.exists(self.log_dir):
            os.symlink(storage_dir, self.log_dir)

    def save_dir(self, dir_name):
        return os.path.join(self.log_dir, dir_name)

    def _init_message_logger(self):
        message_logger = logging.getLogger('messages')
        message_logger.setLevel(
            logging.DEBUG if self.verbose else logging.INFO)
        formatter = logging.Formatter(
            '[%(levelname)s] [%(asctime)s] %(message)s')
        std_handler = logging.StreamHandler()
        std_handler.setLevel(message_logger.level)
        std_handler.setFormatter(formatter)

        file_handler = logging.FileHandler(
            os.path.join(self.log_dir, self.LOG_FILE_NAME))
        file_handler.setLevel(message_logger.level)
        file_handler.setFormatter(formatter)

        message_logger.addHandler(std_handler)
        message_logger.addHandler(file_handler)
        return message_logger

    def report_time(self, name: str):
        if self.verbose:
            self.info(name + " time :" + str(time.time() - self.timestamp))
            self.timestamp = time.time()

    def report_eta(self, steps, total, epoch):
        self.logged = self.logged % total + 1
        steps = steps % total
        if self.eta_time is None:
            self.eta_time = time.time()
            speed = -1
        else:
            eta_time = time.time()
            speed = eta_time - self.eta_time
            if self.speed is not None:
                speed = ((self.logged - 1) * self.speed + speed) / self.logged
            self.speed = speed
            self.eta_time = eta_time

        seconds = (total - steps) * speed
        hours = seconds // 3600
        minutes = (seconds - (hours * 3600)) // 60
        seconds = seconds % 60

        print('%d/%d batches processed in epoch %d, ETA: %2d:%2d:%2d' %
              (steps, total, epoch,
               hours, minutes, seconds), end='\r')

    def args(self, parameters=None):
        if parameters is None:
            with open(os.path.join(self.log_dir, self.ARGS_FILE_NAME), 'rt') as reader:
                return yaml.load(reader.read())
        with open(os.path.join(self.log_dir, self.ARGS_FILE_NAME), 'wt') as writer:
            yaml.dump(parameters.dump(), writer)

    def metrics(self, epoch, steps, metrics_dict):
        results = {}
        for name, a in metrics_dict.items():
            results[name] = {'count': a.count, 'value': float(a.avg)}
            self.add_scalar('metrics/' + name, a.avg, steps)
        result_dict = {
            str(datetime.now()): {
                'epoch': epoch,
                'steps': steps,
                **results
            }
        }
        string_result = yaml.dump(result_dict)
        self.info(string_result)
        self.metrics_writer.write(string_result)
        self.metrics_writer.flush()

    def named_number(self, name, num=None, default=0):
        if num is None:
            return int(self.has_signal(name)) or default
        else:
            with open(os.path.join(self.log_dir, name), 'w') as writer:
                writer.write(str(num))
            return num

    epoch = functools.partialmethod(named_number, 'epoch')
    iter = functools.partialmethod(named_number, 'iter')

    def message(self, level, content):
        self.message_logger.__getattribute__(level)(content)

    def images(self, prefix, image_dict, step):
        for name, image in image_dict.items():
            self.add_image(prefix + '/' + name, image, step, dataformats='HWC')

    def merge_save_images(self, name, images):
        for i, image in enumerate(images):
            if i == 0:
                result = image
            else:
                result = np.concatenate([result, image], 0)
        cv2.imwrite(os.path.join(self.vis_dir(), name+'.jpg'), result)

    def vis_dir(self):
        vis_dir = os.path.join(self.log_dir, self.VISUALIZE_NAME)
        if not os.path.exists(vis_dir):
            os.mkdir(vis_dir)
        return vis_dir

    def save_image_dict(self, images, max_size=1024):
        for file_name, image in images.items():
            height, width = image.shape[:2]
            if height > width:
                actual_height = min(height, max_size)
                actual_width = int(round(actual_height * width / height))
            else:
                actual_width = min(width, max_size)
                actual_height = int(round(actual_width * height / width))
                image = cv2.resize(image, (actual_width, actual_height))
            cv2.imwrite(os.path.join(self.vis_dir(), file_name+'.jpg'), image)

    def __getattr__(self, name):
        message_levels = set(['debug', 'info', 'warning', 'error', 'critical'])
        if name == '__setstate__':
            raise AttributeError('haha')
        if name in message_levels:
            return functools.partial(self.message, name)
        elif hasattr(self.__dict__.get('tf_board_logger'), name):
            return self.tf_board_logger.__getattribute__(name)
        else:
            super()