#!/usr/bin/env python3

import os
import re
import configparser
import argparse
import shutil
import logging
import json
import glob
import subprocess
import tempfile
import atexit
import re
import hashlib
import math
import asyncio
import magic

import arrow
import wand.image
import similar_text
import frontmatter
from slugify import slugify
import langdetect
import requests
from breadability.readable import Article
from whoosh import index
import jinja2

import shared

def splitpath(path):
    parts = []
    (path, tail) = os.path.split(path)
    while path and tail:
        parts.insert(0,tail)
        (path,tail) = os.path.split(path)
    return parts

class Indexer(object):

    def __init__(self):
        self.tmp = tempfile.mkdtemp(
            'whooshdb_',
            dir=tempfile.gettempdir()
        )
        atexit.register(
            shutil.rmtree,
            os.path.abspath(self.tmp)
        )
        self.ix = index.create_in(self.tmp, shared.schema)
        self.target = os.path.abspath(os.path.join(
            shared.config.get('target', 'builddir'),
            shared.config.get('var', 'searchdb')
        ))
        self.writer = self.ix.writer()


    async def append(self, singular):
        logging.info("appending search index with %s", singular.fname)

        content_real = [
            singular.fname,
            singular.summary,
            singular.content,
        ]

        content_remote = []
        for url, offlinecopy in singular.offlinecopies.items():
            content_remote.append("%s" % offlinecopy)

        self.writer.add_document(
            title=singular.title,
            url=singular.url,
            content=" ".join(list(map(str,[*content_real, *content_remote]))),
            date=singular.published.datetime,
            tags=",".join(list(map(str, singular.tags))),
            weight=1,
            img="%s" % singular.photo
        )

    def finish(self):
        self.writer.commit()
        if os.path.isdir(self.target):
            shutil.rmtree(self.target)
        shutil.copytree(self.tmp, self.target)

class OfflineCopy(object):
    def __init__(self, url):
        self.url = url
        h = url.encode('utf-8')
        self.fname = hashlib.sha1(h).hexdigest()
        self.targetdir = os.path.abspath(
            shared.config.get('source', 'offlinecopiesdir')
        )
        self.target = os.path.join(
            self.targetdir,
            self.fname
        )
        self.fm = frontmatter.loads('')
        self.fm.metadata = {
            'url': self.url,
            'date': arrow.utcnow().format("YYYY-MM-DDTHH:mm:ssZ"),
        }

    def __repr__(self):
        return self.fm.content

    def write(self):
        logging.info(
            "savig offline copy of\n\t%s to:\n\t%s",
            self.url,
            self.target
        )
        with open(self.target, 'wt') as f:
            f.write(frontmatter.dumps(self.fm))

    def run(self):
        if os.path.isfile(self.target):
            with open(self.target) as f:
                self.fm = frontmatter.loads(f.read())
                return

        logging.info("prepairing offline copy of %s", self.url)
        headers = requests.utils.default_headers()
        headers.update({
            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0',
            'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
        })

        try:
            r = requests.get(
                self.url,
                allow_redirects=True,
                timeout=60,
                headers=headers
            )
        except Exception as e:
            logging.error("%s failed:\n%s", self.url, e)
            self.write()
            return

        if r.status_code != requests.codes.ok:
            logging.warning("%s returned %s", self.url, r.status_code)
            self.write()
            return

        if not len(r.text):
            logging.warning("%s was empty", self.url)
            self.write()
            return

        doc = Article(r.text, url=self.url)
        self.fm.metadata['title'] = doc._original_document.title
        self.fm.metadata['realurl'] = r.url
        self.fm.content = Pandoc(False).convert(doc.readable)
        self.write()


class Renderer(object):
    def __init__(self):
        self.sitevars = dict(shared.config.items('site'))
        self.sitevars['author'] = dict(shared.config.items('author'))
        self.sitevars['author']['socials'] = dict(shared.config.items('socials'))

        self.jinjaldr = jinja2.FileSystemLoader(
            searchpath=shared.config.get('source', 'templatesdir')
        )
        self.j2 = jinja2.Environment(loader=self.jinjaldr)
        self.j2.filters['date'] = Renderer.jinja_filter_date
        self.j2.filters['search'] = Renderer.jinja_filter_search
        self.j2.filters['slugify'] = Renderer.jinja_filter_slugify

    @staticmethod
    def jinja_filter_date(d, form='%Y-%m-%d %H:%m:%S'):
        if d == 'now':
            return arrow.now().strftime(form)
        if form == 'c':
            form = '%Y-%m-%dT%H:%M:%S%z'
        return d.strftime(form)

    @staticmethod
    def jinja_filter_slugify(s):
        return slugify(s, only_ascii=True, lower=True)

    @staticmethod
    def jinja_filter_search(s, r):
        if r in s:
            return True
        return False

    #def rendersingular(self, singular):
        #logging.debug("rendering and saving %s", singular.fname)
        #targetdir = os.path.abspath(os.path.join(
            #shared.config.get('target', 'builddir'),
            #singular.fname
        #))
        #target = os.path.join(targetdir, 'index.html')

        #if not shared.config.get('params', 'force') and os.path.isfile(target):
            #ttime = int(os.path.getmtime(target))
            #if ttime == singular.mtime:
                #logging.debug('%s exists and up-to-date (lastmod: %d)', target, ttime)
                #return

        #if not os.path.isdir(targetdir):
            #os.mkdir(targetdir)

        #tmpl = self.j2.get_template(singular.tmplfile)
        #tmplvars = {
            #'post': singular.tmplvars,
            #'site': self.sitevars,
            #'taxonomy': {},
        #}
        #r = tmpl.render(tmplvars)
        #with open(target, "w") as html:
            #html.write(r)
            #html.close()
            #os.utime(target, (singular.mtime, singular.mtime))


class BaseIter(object):
    def __init__(self):
        self.data = {}

    def append(self, key, value):
        if key in self.data:
            logging.error("duplicate key: %s", key)
            return
        self.data[key] = value

    def __getitem__(self, key):
        return self.data.get(key, {})

    def __repr__(self):
        return json.dumps(list(self.data.values()))

    def __next__(self):
        try:
            r = self.data.next()
        except:
            raise StopIteration()
        return r

    def __iter__(self):
        for k, v in self.data.items():
            yield (k, v)
        return

class CMDLine(object):
    def __init__(self, executable):
        self.executable = self._which(executable)
        if self.executable is None:
            raise OSError('No %s found in PATH!' % executable)
            return

    @staticmethod
    def _which(name):
        for d in os.environ['PATH'].split(':'):
            which = glob.glob(os.path.join(d, name), recursive=True)
            if which:
                return which.pop()
        return None

    def __enter__(self):
        self.process = subprocess.Popen(
            [self.executable, "-stay_open", "True",  "-@", "-"],
            universal_newlines=True,
            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
        return self

    def  __exit__(self, exc_type, exc_value, traceback):
        self.process.stdin.write("-stay_open\nFalse\n")
        self.process.stdin.flush()

    def execute(self, *args):
        args = args + ("-execute\n",)
        self.process.stdin.write(str.join("\n", args))
        self.process.stdin.flush()
        output = ""
        fd = self.process.stdout.fileno()
        while not output.endswith(self.sentinel):
            output += os.read(fd, 4096).decode('utf-8', errors='ignore')
        return output[:-len(self.sentinel)]


class Pandoc(CMDLine):
    """ Handles calling external binary `exiftool` in an efficient way """
    def __init__(self, md2html=True):
        super().__init__('pandoc')
        if md2html:
            self.i = "markdown+" + "+".join([
                'backtick_code_blocks',
                'auto_identifiers',
                'fenced_code_attributes',
                'definition_lists',
                'grid_tables',
                'pipe_tables',
                'strikeout',
                'superscript',
                'subscript',
                'markdown_in_html_blocks',
                'shortcut_reference_links',
                'autolink_bare_uris',
                'raw_html',
                'link_attributes',
                'header_attributes',
                'footnotes',
            ])
            self.o = 'html5'
        else:
            self.o = "markdown-" + "-".join([
                'raw_html',
                'native_divs',
                'native_spans',
            ])
            self.i = 'html'

    def convert(self, text):
        cmd = (
            self.executable,
            '-o-',
            '--from=%s' % self.i,
            '--to=%s' % self.o
        )
        logging.debug('converting content with Pandoc')
        p = subprocess.Popen(
            cmd,
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )

        stdout, stderr = p.communicate(input=text.encode())
        if stderr:
            logging.error("Error during pandoc covert:\n\t%s\n\t%s", cmd, stderr)
        return stdout.decode('utf-8').strip()

# based on http://stackoverflow.com/a/10075210
class ExifTool(CMDLine):
    """ Handles calling external binary `exiftool` in an efficient way """
    sentinel = "{ready}\n"

    def __init__(self):
        super().__init__('exiftool')

    def get_metadata(self, *filenames):
        return json.loads(self.execute('-sort', '-json', '-MIMEType', '-FileType', '-FileName', '-ModifyDate', '-CreateDate', '-DateTimeOriginal', '-ImageHeight', '-ImageWidth', '-Aperture', '-FOV', '-ISO', '-FocalLength', '-FNumber', '-FocalLengthIn35mmFormat', '-ExposureTime', '-Copyright', '-Artist', '-Model', '-GPSLongitude#', '-GPSLatitude#', '-LensID', *filenames))

class Images(BaseIter):
    def __init__(self, extensions=['jpg', 'gif', 'png']):
        super(Images, self).__init__()
        logging.info(
            "initiating images with extensions: %s",
            extensions
        )
        self.files = []
        self.data = {}
        # if anyone knows how to do this in a more pythonic way, please tell me
        paths = [
            shared.config.get('source', 'filesdir'),
            shared.config.get('source', 'photosdir')
        ]
        for p in paths:
            for ext in extensions:
                self.files += glob.glob(os.path.join(p, "*.%s" % ext))


    def populate(self):
        with ExifTool() as e:
            _meta = e.get_metadata(*self.files)
            # parsing the returned meta into a dict of [filename]={meta}
            for e in _meta:
                if 'FileName' not in e:
                    logging.error("missing 'FileName' in element %s", e)
                    continue
                fname = os.path.basename(e['FileName'])
                del(e['FileName'])
                # duplicate files are going to be a problem, so don't send it
                # away with a simple error log entry
                if fname in self.data:
                    raise ValueError('filename collision: %s', fname)
                # convert dates
                for k, v in e.items():
                    e[k] = self.exifdate(v)

                self.data[fname] = WebImage(fname, e)

    def exifdate(self, value):
        """ converts and EXIF date string to ISO 8601 format

        :param value: EXIF date (2016:05:01 00:08:24)
        :type arg1: str
        :return: ISO 8601 string with UTC timezone 2016-05-01T00:08:24+0000
        :rtype: str
        """
        if not isinstance(value, str):
            return value
        match = shared.EXIFREXEG.match(value)
        if not match:
            return value
        return "%s-%s-%sT%s+0000" % (
            match.group('year'),
            match.group('month'),
            match.group('day'),
            match.group('time')
        )

class WebImage(object):
    def __init__(self, fname, meta):
        logging.info(
            "parsing image: %s",
            fname
        )
        self.meta = meta
        self.fpath = os.path.abspath(meta.get('SourceFile', fname))
        self.fname, self.ext = os.path.splitext(fname)
        self.alttext = ''
        self.sizes = []
        self.fallbacksize = int(shared.config.get('common','fallbackimg', fallback='720'))

        for size in shared.config.options('downsize'):
            sizeext = shared.config.get('downsize', size)
            fname = "%s_%s%s" % (self.fname, sizeext, self.ext)
            self.sizes.append((
                int(size),
                {
                    'fpath': os.path.join(
                        shared.config.get('target', 'filesdir'),
                        fname
                    ),
                    'url': "%s/%s/%s" % (
                        shared.config.get('site', 'url'),
                        shared.config.get('source', 'files'),
                        fname
                    ),
                    'crop': shared.config.getboolean('crop', size, fallback=False),
                }
            ))

        self.sizes = sorted(self.sizes, reverse=False)

        self.target = False
        if self.is_downsizeable:
            self.fallback = [e for e in self.sizes if e[0] == self.fallbacksize][0][1]['url']
            self.target = self.sizes[-1][1]['url']
        else:
            self.fallback = "%s/%s/%s" % (
                shared.config.get('site', 'url'),
                shared.config.get('source', 'files'),
                "%s%s" % (self.fname, self.ext)
            )

    def __str__(self):
        if self.is_downsizeable:
            return '\n<figure class="photo"><a target="_blank" class="adaptive" href="%s"><img src="%s" class="adaptimg" alt="%s" /></a><figcaption class=\"caption\">%s%s</figcaption></figure>\n' % (
                self.target,
                self.fallback,
                self.alttext,
                self.fname,
                self.ext
            )
        else:
            return '\n<figure class="picture"><img src="%s" class="aligncenter" alt="%s" /><figcaption class=\"caption\">%s%s</figcaption></figure>\n' % (
                self.fallback,
                self.alttext,
                self.fname,
                self.ext
            )

    @property
    def rssenclosure(self):
        """ Returns the largest available image for RSS to add as attachment """
        target = self.sizes[-1][1]
        return {
            'mime': magic.Magic(mime=True).from_file(target['fpath']),
            'url': target['url'],
            'bytes':  os.path.getsize(target['fpath'])
        }

    @property
    def is_photo(self):
        """ Match image meta against config artist regex to see if the file is
        a photo or just a regular image """
        pattern = shared.config.get('photo', 'regex', fallback=None)
        if not pattern or not isinstance(pattern, str):
            return False
        pattern = re.compile(pattern)

        cpr = self.meta.get('Copyright', '')
        art = self.meta.get('Artist', '')
        if not cpr and not art:
            return False

        if pattern.search(cpr) \
        or pattern.search(art):
            return True

        return False

    @property
    def is_downsizeable(self):
        """ Check if the image is large enough and jpeg or png in order to
        downsize it """
        fb = self.sizes[-1][0]
        ftype = self.meta.get('FileType', None)
        if not ftype:
            return False
        if ftype.lower() == 'jpeg' or ftype.lower() == 'png':
            width = int(self.meta.get('ImageWidth', 0))
            height = int(self.meta.get('ImageHeight', 0))
            if width > fb or height > fb:
                return True
        return False

    def _copy(self):
        target = os.path.join(
            shared.config.get('target', 'filesdir'),
            "%s%s" % (self.fname, self.ext)
        )
        if not os.path.isfile(target):
            logging.debug("can't downsize %s, copying instead" % self.fname)
            shutil.copy(self.fpath, target)

    def _watermark(self, img):
        """ Composite image by adding watermark file over it """
        wmarkfile = os.path.join(
            shared.config.get('common', 'basedir'),
            shared.config.get('common', 'watermark')
        )
        if not os.path.isfile(wmarkfile):
            return img

        with wand.image.Image(filename=wmarkfile) as wmark:
            if img.width > img.height:
                w = img.width * 0.16
                h = wmark.height * (w / wmark.width)
                x = img.width - w - (img.width * 0.01)
                y = img.height - h - (img.height * 0.01)
            else:
                w = img.height * 0.16
                h = wmark.height * (w / wmark.width)
                x = img.width - h - (img.width * 0.01)
                y = img.height - w - (img.height * 0.01)

            w = round(w)
            h = round(h)
            x = round(x)
            y = round(y)

            wmark.resize(w, h)
            if img.width <= img.height:
                wmark.rotate(-90)
            img.composite(image=wmark, left=x, top=y)
        return img


    def _intermediate_dimensions(self, size, width, height, crop = False):
        size = int(size)
        w = width
        h = height
        if (width > height and not crop) \
        or (width < height and crop):
            w = size
            h = int(float(size / width) * height)
        else:
            h = size
            w = int(float(size / height) * width)
        return (w, h)


    def _intermediate(self, img, size, meta, existing = []):
        if img.width <= size and img.height <= size:
            return False

        crop = meta.get('crop', False)
        with img.clone() as thumb:
            width, height = self._intermediate_dimensions(
                size,
                img.width,
                img.height,
                crop
            )
            thumb.resize(width, height)

            if crop:
                thumb.liquid_rescale(size, size, 1, 1)

            if self.meta.get('FileType', 'jpeg').lower() == 'jpeg':
                thumb.compression_quality = 86
                thumb.unsharp_mask(
                    radius=0,
                    sigma=0.5,
                    amount=1,
                    threshold=0.03
                )
                thumb.format = 'pjpeg'

            # this is to make sure pjpeg happens
            with open(meta['fpath'], 'wb') as f:
                thumb.save(file=f)

        return True


    async def downsize(self, existing = []):
        if not self.is_downsizeable:
            self._copy()
            return

        logging.info("checking downsizing for %s", self.fname)
        needed = shared.config.getboolean('params', 'regenerate', fallback=False)

        if not needed:
            for (size, meta) in self.sizes:
                if meta['fpath'] not in existing:
                    needed = True

        if not needed:
            logging.debug("downsizing not needed for %s", self.fname)
            return

        with wand.image.Image(filename=self.fpath) as img:
            img.auto_orient()

            if self.is_photo:
                logging.info("%s is a photo", self.fpath)
                img = self._watermark(img)

            for (size, meta) in self.sizes:
                self._intermediate(img, size, meta, existing)

class Taxonomy(BaseIter):
    def __init__(self, name = None, taxonomy = None, slug = None):
        super(Taxonomy, self).__init__()
        self.name = name
        if name and not slug:
            self.slug = slugify(name, only_ascii=True, lower=True)
        else:
            self.slug = slug
        self.taxonomy = taxonomy

    @property
    def pages(self):
        return math.ceil(len(self.data) / shared.config.getint('common', 'pagination'))

    def __repr__(self):
        return "taxonomy %s with %d items" % (self.taxonomy, len(self.data))

    @property
    def basep(self):
        p = shared.config.get('target', 'builddir')
        if self.taxonomy:
            p = os.path.join(p, self.taxonomy)
        return p

    @property
    def myp(self):
        p = self.basep
        if self.slug:
            return os.path.join(p,self.slug)
        return p

    @property
    def feedp(self):
        return os.path.join(self.myp, 'feed')

    @property
    def pagep(self):
        return os.path.join(self.myp, 'page')

    @property
    def baseurl(self):
        if self.taxonomy and self.slug:
            return "/%s/%s/" % (self.taxonomy, self.slug)
        else:
            return '/'

    @property
    def mtime(self):
        return int(list(sorted(self.data.keys(), reverse=True))[0])

    def __mkdirs(self):
        check = [self.basep, self.myp, self.feedp]

        if self.pages > 1:
            check.append(self.pagep)
            for i in range(2, self.pages+1):
                subpagep = os.path.abspath(os.path.join(
                    self.pagep,
                    '%d' % i
                ))
                check.append(subpagep)

        for p in check:
            if not os.path.isdir(p):
                logging.debug("creating dir %s", p)
                os.mkdir(p)

    def tpath(self, page):
        if page == 1:
            return "%s/index.html" % (self.myp)
        else:
            return "%s/%d/index.html" % (self.pagep, page)


    async def render(self, renderer):
        self.__mkdirs()
        page = 1
        testpath = self.tpath(page)
        if not shared.config.getboolean('params', 'force') and os.path.isfile(testpath):
            ttime = int(os.path.getmtime(testpath))
            if ttime == self.mtime:
                logging.info('taxonomy index for "%s" exists and up-to-date (lastmod: %d)', self.slug, ttime)
                return

        while page <= self.pages:
            self.renderpage(renderer, page)
            page = page+1

    def renderpage(self, renderer, page):
        pagination = int(shared.config.get('common', 'pagination'))
        start = int((page-1) * pagination)
        end = int(start + pagination)

        posttmpls = [self.data[k].tmplvars for k in list(sorted(
            self.data.keys(), reverse=True))[start:end]]

        target = self.tpath(page)
        logging.info("rendering taxonomy page %d to %s", page, target)
        tmplvars = {
            'taxonomy': {
                'url': self.baseurl,
                'name': self.name,
                'taxonomy': self.taxonomy,
                'paged': page,
                'total': self.pages,
                'perpage': pagination
            },
            'site': renderer.sitevars,
            'posts': posttmpls,
        }

        r = renderer.j2.get_template('archive.html').render(tmplvars)
        with open(target, "wt") as html:
            html.write(r)
            os.utime(target, (self.mtime, self.mtime))

        if 1 == page:
            target = os.path.join(self.feedp, 'index.xml')
            logging.info("rendering RSS feed to %s", target)
            r = renderer.j2.get_template('rss.html').render(tmplvars)
            with open(target, "wt") as html:
                html.write(r)
            os.utime(target, (self.mtime, self.mtime))

class Content(BaseIter):
    def __init__(self, images, extensions=['md']):
        super(Content, self).__init__()
        self.images = images
        basepath = shared.config.get('source', 'contentdir')
        self.files = []
        for ext in extensions:
            self.files += glob.glob(os.path.join(basepath, "*", "*.%s" % ext))
        self.tags = {}
        self.categories = {}
        self.front = Taxonomy()

    def populate(self):
        for fpath in self.files:
            item = Singular(fpath, self.images)
            self.append(item.pubtime, item)

            if item.isonfront:
                self.front.append(item.pubtime, item)

            if item.iscategorised:
                if item.category not in self.categories:
                    self.categories[item.category] = Taxonomy(item.category, 'category')
                self.categories[item.category].append(item.pubtime, item)

            for tag in item.tags:
                tslug = slugify(tag, only_ascii=True, lower=True)
                if tslug not in self.tags:
                    self.tags[tslug] = Taxonomy(tag, 'tag', tslug)
                self.tags[tslug].append(item.pubtime, item)
                self.symlinktag(tslug, item.path)

    def symlinktag(self, tslug, fpath):
        fdir, fname = os.path.split(fpath)
        tagpath = os.path.join(shared.config.get('source', 'tagsdir'), tslug)
        if not os.path.isdir(tagpath):
            os.mkdir(tagpath)
        sympath = os.path.relpath(fdir, tagpath)
        dst = os.path.join(tagpath, fname)
        src = os.path.join(sympath, fname)
        if not os.path.islink(dst):
            os.symlink(src, dst)

    def sitemap(self):
        target = os.path.join(
            shared.config.get('target', 'builddir'),
            'sitemap.txt'
        )
        urls = []
        for t, item in self.data.items():
            urls.append( "%s/%s/" % (
                shared.config.get('site', 'url'),
                item.fname
            ))

        with open(target, "wt") as f:
            logging.info("writing sitemap to %s" % (target))
            f.write("\n".join(urls))

class Singular(object):
    def __init__(self, path, images):
        logging.debug("initiating singular object from %s", path)
        self.path = path
        self.images = images
        self.category = splitpath(path)[-2]
        self.mtime = int(os.path.getmtime(self.path))
        self.fname, self.ext = os.path.splitext(os.path.basename(self.path))
        self.meta = {}
        self.content = ''
        self.photo = self.images.data.get("%s.jpg" % self.fname, None)
        self.__parse()

    def __repr__(self):
        return "%s (lastmod: %s)" % (self.fname, self.published)

    def __parse(self):
        with open(self.path, mode='rt') as f:
            self.meta, self.content = frontmatter.parse(f.read())
            self.__filter_images()
        if self.isphoto:
            #self.photo.alttext = self.content
            self.content = "%s\n%s" % (
                self.content,
                self.photo
            )

    #@property
    #def isrepost(self):
        #isrepost = False

        #if len(self.reactions.keys()):
            #isrepost = list(self.reactions.keys())[0]

        #if isrepost:
            #if len(self.reactions[isrepost]) == 1:
                #linkto = self.reactions[isrepost][0]


    def __filter_images(self):
        linkto = False
        isrepost = None

        if len(self.reactions.keys()):
            isrepost = list(self.reactions.keys())[0]
            if isrepost and \
            len(self.reactions[isrepost]) == 1:
                linkto = self.reactions[isrepost][0]

        m = shared.MDIMGREGEX.findall(self.content)
        if not m:
            logging.debug("no images found")
            return

        for shortcode, alt, fname, title, cl in m:
            image = self.images.data.get(fname, None)
            if not image:
                logging.debug("%s not found in images", fname)
                continue

            logging.debug(
                "replacing %s in content with %s",
                shortcode,
                "%s" % image
            )
            self.content = self.content.replace(
                shortcode,
                "%s" % image
            )

    @property
    def reactions(self):
        # getting rid of '-' to avoid css trouble and similar
        convert = {
            'bookmark-of': 'bookmark',
            'repost-of': 'repost',
            'in-reply-to': 'reply',
        }
        reactions = {}

        for k, v in convert.items():
            x = self.meta.get(k, None)
            if not x:
                continue
            if isinstance(x, str):
                x = [x]
            reactions[v] = x

        return reactions

    @property
    def lang(self):
        lang = 'en'
        try:
            lang = langdetect.detect("\n".join([
                self.title,
                self.content
            ]))
        except:
            pass
        return lang

    @property
    def tags(self):
        return list(self.meta.get('tags', []))

    @property
    def published(self):
        return arrow.get(
            self.meta.get('published', self.mtime)
        )

    @property
    def updated(self):
        return arrow.get(
            self.meta.get('updated',
                self.meta.get('published', self.mtime)
            )
        )

    @property
    def pubtime(self):
        return int(self.published.timestamp)

    @property
    def isphoto(self):
        if not self.photo:
            return False
        return self.photo.is_photo

    @property
    def isbookmark(self):
        return self.meta.get('bookmark-of', False)

    @property
    def ispage(self):
        if not self.meta:
            return True
        return False

    @property
    def isonfront(self):
        if self.ispage or self.isbookmark:
            return False
        return True

    @property
    def iscategorised(self):
        if self.ispage:
            return False
        return True

    @property
    def summary(self):
        return self.meta.get('summary', '')

    @property
    def title(self):
        for maybe in ['title', 'bookmark-of', 'in-reply-to', 'repost-of']:
            maybe = self.meta.get(maybe, False)
            if maybe:
                return maybe
        return self.fname

    @property
    def url(self):
        return "%s/%s/" % (shared.config.get('site', 'url'), self.fname)

    @property
    def tmplfile(self):
        if self.ispage:
            return 'page.html'
        else:
            return 'singular.html'

    @property
    def html(self):
        return Pandoc().convert(self.content)

    @property
    def offlinecopies(self):
        # stupidly simple property caching
        if hasattr(self, 'copies'):
            return self.copies

        copies = {}
        for maybe in ['bookmark-of', 'in-reply-to', 'repost-of']:
            maybe = self.meta.get(maybe, False)
            if not maybe:
                continue
            if not isinstance(maybe, list):
                maybe = [maybe]
            for url in maybe:
                copies[url] = OfflineCopy(url)
                copies[url].run()

        self.copies = copies
        return copies

    @property
    def exif(self):
        if not self.isphoto:
            return None

        exif = {}
        mapping = {
            'camera': [
                'Model'
            ],
            'aperture': [
                'FNumber',
                'Aperture'
            ],
            'shutter_speed': [
                'ExposureTime'
            ],
            'focallength35mm': [
                'FocalLengthIn35mmFormat',
            ],
            'focallength': [
                'FocalLength',
            ],
            'iso': [
                'ISO'
            ],
            'lens': [
                'LensID',
            ],
            'date': [
                'CreateDate',
                'DateTimeOriginal',
            ],
            'geo_latitude': [
                'GPSLatitude'
            ],
            'geo_longitude': [
                'GPSLongitude'
            ],
        }

        for ekey, candidates in mapping.items():
            for candidate in candidates:
                maybe = self.photo.meta.get(candidate, None)
                if maybe:
                    if 'geo_' in ekey:
                        exif[ekey] = round(float(maybe), 5)
                    else:
                        exif[ekey] = maybe
                    break

        return exif

    @property
    def rssenclosure(self):
        if not self.isphoto:
            return {}
        return self.photo.rssenclosure

    @property
    def tmplvars(self):
        return {
            'title': self.title,
            'published': self.published.datetime,
            'tags': self.tags,
            'author': dict(shared.config.items('author')),
            'content': self.content,
            'html': self.html,
            'category': self.category,
            'reactions': self.reactions,
            'updated': self.updated.datetime,
            'summary': self.meta.get('summary', ''),
            'exif': self.exif,
            'lang': self.lang,
            'syndicate': '',
            'slug': self.fname,
            'shortslug': self.shortslug,
            'rssenclosure': self.rssenclosure,
        }

    @property
    def shortslug(self):
        return self.baseN(self.pubtime)

    @staticmethod
    def baseN(num, b=36, numerals="0123456789abcdefghijklmnopqrstuvwxyz"):
        """ Used to create short, lowecase slug for a number (an epoch) passed """
        num = int(num)
        return ((num == 0) and numerals[0]) or (
            Singular.baseN(
                num // b,
                b,
                numerals
            ).lstrip(numerals[0]) + numerals[num % b]
        )

    async def render(self, renderer):
        logging.info("rendering and saving %s", self.fname)
        targetdir = os.path.abspath(os.path.join(
            shared.config.get('target', 'builddir'),
            self.fname
        ))
        target = os.path.join(targetdir, 'index.html')

        if not shared.config.getboolean('params', 'force') and os.path.isfile(target):
            ttime = int(os.path.getmtime(target))
            logging.debug('ttime is %d mtime is %d', ttime, self.mtime)
            if ttime == self.mtime:
                logging.debug('%s exists and up-to-date (lastmod: %d)', target, ttime)
                return

        if not os.path.isdir(targetdir):
            os.mkdir(targetdir)

        tmplvars = {
            'post': self.tmplvars,
            'site': renderer.sitevars,
            'taxonomy': {},
        }
        r = renderer.j2.get_template(self.tmplfile).render(tmplvars)
        with open(target, "w") as html:
            logging.debug('writing %s', target)
            html.write(r)
            html.close()
            os.utime(target, (self.mtime, self.mtime))

class NASG(object):
    def __init__(self):
        # --- set params
        parser = argparse.ArgumentParser(description='Parameters for NASG')
        parser.add_argument(
            '--regenerate',
            action='store_true',
            default=False,
            help='force downsizing images'
        )
        parser.add_argument(
            '--force',
            action='store_true',
            default=False,
            help='force rendering HTML'
        )
        parser.add_argument(
            '--loglevel',
            default='info',
            help='change loglevel'
        )
        parser.add_argument(
            '--nodownsize',
            action='store_true',
            default=False,
            help='skip image downsizing'
        )
        parser.add_argument(
            '--norender',
            action='store_true',
            default=False,
            help='skip rendering'
        )

        params = vars(parser.parse_args())
        shared.config.add_section('params')
        for k, v in params.items():
            shared.config.set('params', k, str(v))


        # remove the rest of the potential loggers
        while len(logging.root.handlers) > 0:
            logging.root.removeHandler(logging.root.handlers[-1])

        # --- set loglevel
        llevel = {
            'critical': 50,
            'error': 40,
            'warning': 30,
            'info': 20,
            'debug': 10
        }
        logging.basicConfig(
            level=llevel[shared.config.get('params', 'loglevel')],
            format='%(asctime)s - %(levelname)s - %(message)s'
        )

    async def __adownsize(self, images, existing):
        for fname, img in images:
            await img.downsize(existing)

    async def __acrender(self, content, renderer):
        for (pubtime, singular) in content:
            await singular.render(renderer)

    async def __atrender(self, taxonomies, renderer):
        for e in taxonomies:
            for name, t in e.items():
                await t.render(renderer)

    async def __afrender(self, front, renderer):
        await front.render(renderer)

    async def __aindex(self, content, searchdb):
        for (pubtime, singular) in content:
            await searchdb.append(singular)

    def run(self):
        loop = asyncio.get_event_loop()

        for d in shared.config.options('target'):
            if 'dir' in d and not os.path.isdir(shared.config.get('target', d)):
                os.mkdir(shared.config.get('target', d))

        logging.info("discovering images")
        images = Images()
        images.populate()
        existing = glob.glob(os.path.join(shared.config.get('target', 'filesdir'), "*"))
        if not shared.config.getboolean('params', 'nodownsize'):
            logging.info("downsizing images")
            loop.run_until_complete(self.__adownsize(images, existing))

        logging.info("discovering content")
        content = Content(images)
        content.populate()

        if not shared.config.getboolean('params', 'norender'):
            renderer = Renderer()
            logging.info("rendering content")
            loop.run_until_complete(self.__acrender(content, renderer))

            logging.info("rendering categories and tags")
            loop.run_until_complete(self.__atrender([content.categories, content.tags], renderer))

            logging.info("rendering the front page elements")
            loop.run_until_complete(self.__afrender(content.front, renderer))

            logging.info("rendering sitemap")
            content.sitemap()

        logging.info("copy the static bits")
        src = shared.config.get('source', 'staticdir')
        for item in os.listdir(src):
            s = os.path.join(src, item)
            d = os.path.join(shared.config.get('target', 'builddir'), item)
            logging.debug("copying %s to %s", s, d)
            shutil.copy2(s, d)

        logging.info("pouplating searchdb")
        searchdb = Indexer()
        loop.run_until_complete(self.__aindex(content, searchdb))
        searchdb.finish()

        loop.close()


if __name__ == '__main__':
    worker = NASG()
    worker.run()