import asyncio
from aiofile import AIOFile, Reader, Writer
import logging
from datetime import datetime, timezone, timedelta

class XMLWriter():
    def __init__(self, filename: str):
        self.filename = filename


    async def write(self, urls, timezone_offset):
        async with AIOFile(self.filename, 'w') as aiodf:
            writer = Writer(aiodf)
            await writer('<?xml version="1.0" encoding="utf-8"?>\n')
            await writer(
                '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"'
                ' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'
                ' xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"'
                ' xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">\n')
            await aiodf.fsync()
            for data in urls:

                timestamp  = data[1][1]
                changefreq = data[1][2]
                priority   = data[1][3]
                image_data = data[1][4]

                url = "<loc>{}</loc>".format(data[0])

                if timestamp is not None:
                    timestamp = datetime.strptime(timestamp, "%a, %d %b %Y %H:%M:%S %Z").astimezone(tz=timezone(timedelta(hours=timezone_offset))).isoformat()
                    url += "<lastmod>{}</lastmod>".format(str(timestamp))

                if changefreq is not None:
                    url += "<changefreq>{}</changefreq>".format(str(changefreq))

                if priority is not None:
                    url += "<priority>{}</priority>".format(str(priority))

                if len(image_data) > 0:
                    for image in image_data:
                        image_xml = ""
                        if 'src' in image:          image_xml += "<image:loc>{}</image:loc>".format(image['src'])
                        if 'title' in image:        image_xml += "<image:title>{}</image:title>".format(image['title'])
                        if 'caption' in image:      image_xml += "<image:caption>{}</image:caption>".format(image['caption'])
                        if 'geo_location' in image: image_xml += "<image:geo_location>{}</image:geo_location>".format(image['geo_location'])
                        if 'license' in image:      image_xml += "<image:license>{}</image:license>".format(image['license'])

                        url += "<image:image>{}</image:image>".format(image_xml)

                await writer('<url>{}</url>\n'.format(url))

            await aiodf.fsync()

            await writer('</urlset>')
            await aiodf.fsync()