import os, json, re
import subprocess
from datetime import datetime


def pandoc(content, format_in, format_out):
    pandoc_cmd = "echo '{}' | pandoc -f {} -t {}".format(
        content, format_in, format_out)
    output = subprocess.check_output(pandoc_cmd, shell=True)
    return output.decode('utf8')


def page_props(wikicontent):
    exp = re.compile(r'\|(\w*?)\=(.*)', flags=re.M)
    found = re.findall(exp, wikicontent)
    found_dict ={item[0]: item[1] for item in found}
    return found_dict


def unpack_response(response):
    # printout is ordered dict
    d = {}
    printouts = response['printouts']
    page = response['fulltext']
    d['page'] = page
    for prop in printouts:
        p_item = response['printouts'][prop]
        for prop_val in p_item:
            if isinstance(prop_val, dict) is False:
                d[prop] = prop_val
            else:
                # if len(prop_val) > 0:
                props = list(prop_val.keys())
                if 'fulltext' in props:
                    val = prop_val.get('fulltext')
                elif 'timestamp' in props:
                    val = datetime.fromtimestamp(int(prop_val.get('timestamp')))
                else:
                    val = list(prop_val.values())[0]
                d[prop] = val
    return(d)


def update_json(imgsjson_fn, img_dict, img_fn):
    # write img_dict  to json file
    if os.path.isfile(imgsjson_fn) is True:  # if json exists
        with open(imgsjson_fn, 'r') as imgsjson_file:  # read its content
            imgsjson_dict = json.load(imgsjson_file)
            # print(imgsjson_dict)
    else:  # other wise
        imgsjson_dict = {}  # imgsjson_dict will be an empty dictionary

    # is file already in dict
    if img_dict['name'] in imgsjson_dict.keys():
        # check if
        # file is locally stored
        img_issaved = os.path.isfile(img_fn)
        # timestamp in json is same as in img object
        img_samets = imgsjson_dict[img_dict['name']]['timestamp'] == img_dict['timestamp']
        if all([img_issaved, img_samets]) is False:  # if one or more is False
            # ask it to download again
            download = True
            imgsjson_dict[img_dict['name']] = img_dict  # add img_dict to imgsjson_dict under the key of the img.name
        else:
            download = False
    else:
        download = True
        imgsjson_dict[img_dict['name']] = img_dict  # add img_dict to imgsjson_dict under the key of the img.name

    with open(imgsjson_fn, 'w') as imgsjson_file:
        json.dump(imgsjson_dict, imgsjson_file, indent=4)

    return download