#! /usr/bin/python
# -*- coding: utf-8 -*-

# jp: a SàT command line tool
# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""Standard outputs"""


from sat_frontends.jp.constants import Const as C
from sat.core.i18n import _
from sat.tools.common import template
import webbrowser
import tempfile
import os.path

__outputs__ = ["Template"]
TEMPLATE = u'template'
OPTIONS = {u'template', u'browser', u'inline-css'}


class Template(object):
    """outputs data using SàT templates"""

    def __init__(self, jp):
        self.host = jp
        jp.register_output(C.OUTPUT_COMPLEX, TEMPLATE, self.render)
        self.renderer = template.Renderer(jp)

    def parse_options(self, options):
        options_dict = {}
        for option in options:
            try:
                key, value = option.split(u'=', 1)
            except ValueError:
                key, value = option, None
            options_dict[key.strip()] = value.strip() if value is not None else None
        return options_dict

    def render(self, data):
        """render output data using requested template

        template to render the data can be either command's TEMPLATE or
        template output_option requested by user.
        @param data(dict): data is a dict which map from variable name to use in template
            to the variable itself.
            command's template_data_mapping attribute will be used if it exists to convert
            data to a dict usable by the template.
        """
        cmd = self.host.command
        options = self.parse_options(cmd.args.output_opts)
        if not OPTIONS.issuperset(options):
            self.host.disp(u"The following output options are invalid: {invalid_options}".format(
                invalid_options = u', '.join(set(options).difference(OPTIONS))),
                error=True)
            self.host.quit(C.EXIT_BAD_ARG)
        try:
            template_path = cmd.TEMPLATE
        except AttributeError:
            if not 'template' in cmd.args.output_opts:
                self.host.disp(u'no default template set for this command, '
                    u'you need to specify a template using --oo template=[path/to/template.html',
                    error=True)
                self.host.quit(C.EXIT_BAD_ARG)
        try:
            template_path = options['template']
        except KeyError:
            # template is not specified, we use default one
            pass
        if template_path is None:
            self.host.disp(u"Can't parse template, please check its syntax",
                           error=True)
            self.host.quit(C.EXIT_BAD_ARG)

        try:
            mapping_cb = cmd.template_data_mapping
        except AttributeError:
            kwargs = data
        else:
            kwargs = mapping_cb(data)

        css_inline = u'inline-css' in options
        rendered = self.renderer.render(template_path, css_inline=css_inline, **kwargs)

        if 'browser' in options:
            template_name = os.path.basename(template_path)
            tmp_dir = tempfile.mkdtemp()
            self.host.disp(_(u"Browser opening requested.\nTemporary files are put in the following directory, "
                             u"you'll have to delete it yourself once finished viewing: {}").format(tmp_dir))
            tmp_file = os.path.join(tmp_dir, template_name)
            with open(tmp_file, 'w') as f:
                f.write(rendered.encode('utf-8'))
            static_dir = self.renderer.getStaticDir(template_path)
            if os.path.exists(static_dir):
                import shutil
                shutil.copytree(static_dir, os.path.join(tmp_dir, u'static'))
            webbrowser.open(tmp_file)
        else:
            self.host.disp(rendered)