# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:

# Copyright 2015-2017 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# This file is part of qutebrowser.
#
# qutebrowser is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# qutebrowser 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.

"""Tests for position_caret.js."""

import os
import pytest
from qutebrowser.utils import javascript, utils
from qutebrowser.browser import shared
from qutebrowser.config import config
from PyQt5.QtWebEngineWidgets import QWebEngineSettings, QWebEngineProfile, QWebEngineScript
import qutebrowser.browser.webengine.webenginesettings as webenginesettings

DEFAULT_BODY_BG = "rgba(0, 0, 0, 0)"
GREEN_BODY_BG = "rgb(0, 255, 0)"
CSS_BODY_GREEN = "body {background-color: rgb(0, 255, 0);}"
CSS_BODY_RED = "body {background-color: rgb(255, 0, 0);}"

class StylesheetTester:

    """Helper class (for the caret_tester fixture) for asserts.

    Attributes:
        js: The js_tester fixture.
    """

    def __init__(self, js_tester, config_stub):
        self.js = js_tester
        self.config_stub = config_stub

    def init_stylesheet(self, css_file="green.css"):

        self.config_stub.val.content.user_stylesheets = \
            os.path.join(os.path.dirname(__file__), css_file)
        p = QWebEngineProfile.defaultProfile()
        webenginesettings._init_stylesheet(p)

    def set_css(self, css):
        """Set css to CSS via stylesheet.js."""
        code = javascript.assemble('stylesheet', 'set_css', css)
        self.js.run(code, None)

    def check_set(self, value, element="background-color"):
        """Check whether the css in ELEMENT is set to VALUE."""
        self.js.run("window.getComputedStyle(document.body, null)"
                    ".getPropertyValue('{}');".format(element), value)


@pytest.fixture
def stylesheet_tester(js_tester_webengine, config_stub):
    """Helper fixture to test caret browsing positions."""
    ss_tester = StylesheetTester(js_tester_webengine, config_stub)
    # Showing webview here is necessary for test_scrolled_down_img to
    # succeed in some cases, see #1988
    ss_tester.js.webview.show()
    return ss_tester

@pytest.mark.parametrize('page', ['stylesheet/simple.html',
                                  'stylesheet/simple_bg_set_red.html'])
@pytest.mark.parametrize('set_js', [True, False])
def test_set_delayed(stylesheet_tester, page, set_js):
    stylesheet_tester.init_stylesheet("none.css")
    stylesheet_tester.js.load(page)
    if set_js:
        stylesheet_tester.js.run(
            'document.body.style.backgroundColor = "red";', 'red')
        pytest.xfail("overring values set with js does not work.")
    stylesheet_tester.set_css("body {background-color: rgb(0, 255, 0);}")
    stylesheet_tester.check_set("rgb(0, 255, 0)")

@pytest.mark.parametrize('page', ['stylesheet/simple.html',
                                  'stylesheet/simple_bg_set_red.html'])
def test_set_clear_bg(stylesheet_tester, page):
    stylesheet_tester.init_stylesheet()
    stylesheet_tester.js.load('stylesheet/simple.html')
    stylesheet_tester.check_set(GREEN_BODY_BG)
    stylesheet_tester.set_css("")
    stylesheet_tester.check_set(DEFAULT_BODY_BG)

def test_no_set_xml(stylesheet_tester):
    stylesheet_tester.init_stylesheet()
    pytest.xfail("loading xml files throws exceptions")
    stylesheet_tester.js.load_file('stylesheet/simple.xml')
    stylesheet_tester.check_set(DEFAULT_BODY_BG)