import os

from ebook_converter.customize.conversion import InputFormatPlugin, OptionRecommendation
from ebook_converter.constants_old import numeric_version


class RecipeDisabled(Exception):
    pass


class RecipeInput(InputFormatPlugin):

    name        = 'Recipe Input'
    author      = 'Kovid Goyal'
    description = 'Download periodical content from the internet'
    file_types  = {'recipe', 'downloaded_recipe'}
    commit_name = 'recipe_input'

    recommendations = {
        ('chapter', None, OptionRecommendation.HIGH),
        ('dont_split_on_page_breaks', True, OptionRecommendation.HIGH),
        ('use_auto_toc', False, OptionRecommendation.HIGH),
        ('input_encoding', None, OptionRecommendation.HIGH),
        ('input_profile', 'default', OptionRecommendation.HIGH),
        ('page_breaks_before', None, OptionRecommendation.HIGH),
        ('insert_metadata', False, OptionRecommendation.HIGH),
        }

    options = {
        OptionRecommendation(name='test', recommended_value=False,
            help='Useful for recipe development. Forces max_articles_per_feed '
                 'to 2 and downloads at most 2 feeds. You can change the '
                 'number of feeds and articles by supplying optional '
                 'arguments. For example: --test 3 1 will download at most 3 '
                 'feeds and only 1 article per feed.'),
        OptionRecommendation(name='username', recommended_value=None,
            help='Username for sites that require a login to access content.'),
        OptionRecommendation(name='password', recommended_value=None,
            help='Password for sites that require a login to access content.'),
        OptionRecommendation(name='dont_download_recipe',
            recommended_value=False,
            help='Do not download latest version of builtin recipes from the '
                 'calibre server'),
        OptionRecommendation(name='lrf', recommended_value=False,
            help='Optimize fetching for subsequent conversion to LRF.'),
        }

    def convert(self, recipe_or_file, opts, file_ext, log,
            accelerators):
        from ebook_converter.web.feeds.recipes import compile_recipe
        opts.output_profile.flow_size = 0
        if file_ext == 'downloaded_recipe':
            from ebook_converter.utils.zipfile import ZipFile
            zf = ZipFile(recipe_or_file, 'r')
            zf.extractall()
            zf.close()
            with open('download.recipe', 'rb') as f:
                self.recipe_source = f.read()
            recipe = compile_recipe(self.recipe_source)
            recipe.needs_subscription = False
            self.recipe_object = recipe(opts, log, self.report_progress)
        else:
            if os.environ.get('CALIBRE_RECIPE_URN'):
                from ebook_converter.web.feeds.recipes.collection import get_custom_recipe, get_builtin_recipe_by_id
                urn = os.environ['CALIBRE_RECIPE_URN']
                log.info('Downloading recipe urn: %s', urn)
                rtype, recipe_id = urn.partition(':')[::2]
                if not recipe_id:
                    raise ValueError('Invalid recipe urn: ' + urn)
                if rtype == 'custom':
                    self.recipe_source = get_custom_recipe(recipe_id)
                else:
                    self.recipe_source = get_builtin_recipe_by_id(urn, log=log, download_recipe=True)
                if not self.recipe_source:
                    raise ValueError('Could not find recipe with urn: ' + urn)
                if not isinstance(self.recipe_source, bytes):
                    self.recipe_source = self.recipe_source.encode('utf-8')
                recipe = compile_recipe(self.recipe_source)
            elif os.access(recipe_or_file, os.R_OK):
                with open(recipe_or_file, 'rb') as f:
                    self.recipe_source = f.read()
                recipe = compile_recipe(self.recipe_source)
                log.info('Using custom recipe')
            else:
                from ebook_converter.web.feeds.recipes.collection import (
                        get_builtin_recipe_by_title, get_builtin_recipe_titles)
                title = getattr(opts, 'original_recipe_input_arg', recipe_or_file)
                title = os.path.basename(title).rpartition('.')[0]
                titles = frozenset(get_builtin_recipe_titles())
                if title not in titles:
                    title = getattr(opts, 'original_recipe_input_arg', recipe_or_file)
                    title = title.rpartition('.')[0]

                raw = get_builtin_recipe_by_title(title, log=log,
                        download_recipe=not opts.dont_download_recipe)
                builtin = False
                try:
                    recipe = compile_recipe(raw)
                    self.recipe_source = raw
                    if recipe.requires_version > numeric_version:
                        log.warning('Downloaded recipe needs calibre version '
                                    'at least: %s',
                                    '.'.join(recipe.requires_version))
                        builtin = True
                except:
                    log.exception('Failed to compile downloaded recipe. '
                                  'Falling back to builtin one')
                    builtin = True
                if builtin:
                    log.info('Using bundled builtin recipe')
                    raw = get_builtin_recipe_by_title(title, log=log,
                            download_recipe=False)
                    if raw is None:
                        raise ValueError('Failed to find builtin recipe: '+title)
                    recipe = compile_recipe(raw)
                    self.recipe_source = raw
                else:
                    log.info('Using downloaded builtin recipe')

            if recipe is None:
                raise ValueError('%r is not a valid recipe file or builtin recipe' %
                        recipe_or_file)

            disabled = getattr(recipe, 'recipe_disabled', None)
            if disabled is not None:
                raise RecipeDisabled(disabled)
            ro = recipe(opts, log, self.report_progress)
            ro.download()
            self.recipe_object = ro

        for key, val in self.recipe_object.conversion_options.items():
            setattr(opts, key, val)

        for f in os.listdir('.'):
            if f.endswith('.opf'):
                return os.path.abspath(f)

        for root, _, fnames in os.walk('.'):
            for f in fnames:
                f = os.path.join(root, f)
                if f.endswith('.opf'):
                    return os.path.abspath(f)

    def postprocess_book(self, oeb, opts, log):
        if self.recipe_object is not None:
            self.recipe_object.internal_postprocess_book(oeb, opts, log)
            self.recipe_object.postprocess_book(oeb, opts, log)

    def specialize(self, oeb, opts, log, output_fmt):
        if opts.no_inline_navbars:
            from ebook_converter.ebooks.oeb.base import XPath
            for item in oeb.spine:
                for div in XPath('//h:div[contains(@class, "calibre_navbar")]')(item.data):
                    div.getparent().remove(div)

    def save_download(self, zf):
        raw = self.recipe_source
        if isinstance(raw, str):
            raw = raw.encode('utf-8')
        zf.writestr('download.recipe', raw)
