import os
import time
import json
import base64
import traceback
from _log import logger, EventType
import tools
import shutil
import cv2
import copy


def is_image(path: str):
    img = cv2.imread(path)
    if img is None:
        return False
    return True


class Interface:
    def __init__(self, interface=None):
        if interface is None:
            interface = os.getenv('PARAMS')
        if interface is None:
            interface = '{"width":512}'

        self.interface = self.decode_b64(interface)

        self.input = self.interface.get('input', '/input')
        if not os.path.exists(self.input):
            raise FileNotFoundError('The input file does not exist.')

        self.result = self.interface.get('result', '/output')
        if self.result is None:
            os.makedirs(str(self.result))

        self.params = tools.ProcessorParams(self.interface.get('width'),
                                            self.interface.get('height'),
                                            self.interface.get('rotate'),
                                            self.interface.get('flip'),
                                            self.interface.get('rect'),
                                            self.result,
                                            None)

        self.input_dic = []

    @staticmethod
    def decode_b64(interface):
        try:
            interface = base64.b64decode(interface.encode('utf-8')).decode("utf-8")
        except:
            interface = interface.encode('utf-8')

        logger.info("PREPARE", extra={'event_type': EventType.PROGRESS, 'params': interface})

        interface = json.loads(interface)

        assert isinstance(interface, dict), 'The interface must be a dictionary.'

        return interface

    @staticmethod
    def encode_b64(string):
        return base64.b64encode(string.encode('utf-8')).decode("utf-8")

    def scan_files(self, path: str):
        if not os.path.isdir(path):
            self.input_dic.append(path)
            return
        files = os.listdir(path)
        for file in files:
            self.scan_files(os.path.join(path, file))

    def run(self):
        logger.info("files scanning.", extra={'event_type': EventType.STEP_COMPLETE})
        self.scan_files(self.input)
        files_in_total = len(self.input_dic)
        logger.info("files-in-total",
                    extra={'event_type': EventType.METRICS, 'desc': '处理文件总个数', 'value': files_in_total})
        count = 0
        for path in self.input_dic:
            count += 1
            logger.info("PROGRESS", extra={'event_type': EventType.PROGRESS, 'total': files_in_total, 'current': count})
            try:
                real_path = os.path.dirname(path)
                real_path = os.path.relpath(real_path, self.input)
                output = os.path.join(self.result, real_path)
                if not os.path.exists(output):
                    os.makedirs(output)

                params = copy.deepcopy(self.params)
                params.set_path(path, output)
                if not tools.processor(params):
                    shutil.copy(path, os.path.join(output, os.path.basename(path)))

            except Exception as e:
                logger.info(e, extra={'event_type': EventType.TASK_CRASHED, 'traceback': traceback.format_exc()})


def start(interface=None):
    logger.info('TASK_STARTED', extra={'event_type': EventType.TASK_STARTED})
    t = time.time()
    try:
        Interface(interface=interface).run()
    except Exception as e:
        logger.info(e, extra={'event_type': EventType.TASK_CRASHED, 'traceback': traceback.format_exc()})
    logger.info("TASK_FINISHED", extra={'event_type': EventType.TASK_FINISHED})
    logger.info("TASK_FINISHED")
    elapsed = time.time() - t
    logger.info("time-elapsed", extra={'event_type': EventType.METRICS, 'desc': '总时长', 'value': elapsed})


if __name__ == '__main__':
    start()