# Copyright (C) 2014 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

from cloudinit.tests import helpers as test_helpers
import textwrap

from cloudinit import templater
from cloudinit.util import load_file, write_file

try:
    import Cheetah
    HAS_CHEETAH = True
    c = Cheetah  # make pyflakes and pylint happy, as Cheetah is not used here
except ImportError:
    HAS_CHEETAH = False


class TestTemplates(test_helpers.CiTestCase):

    with_logs = True

    jinja_utf8 = b'It\xe2\x80\x99s not ascii, {{name}}\n'
    jinja_utf8_rbob = b'It\xe2\x80\x99s not ascii, bob\n'.decode('utf-8')

    @staticmethod
    def add_header(renderer, data):
        """Return text (py2 unicode/py3 str) with template header."""
        if isinstance(data, bytes):
            data = data.decode('utf-8')
        return "## template: %s\n" % renderer + data

    def test_render_basic(self):
        in_data = textwrap.dedent("""
            ${b}

            c = d
            """)
        in_data = in_data.strip()
        expected_data = textwrap.dedent("""
            2

            c = d
            """)
        out_data = templater.basic_render(in_data, {'b': 2})
        self.assertEqual(expected_data.strip(), out_data)

    @test_helpers.skipIf(not HAS_CHEETAH, 'cheetah renderer not available')
    def test_detection(self):
        blob = "## template:cheetah"

        (template_type, _renderer, contents) = templater.detect_template(blob)
        self.assertIn("cheetah", template_type)
        self.assertEqual("", contents.strip())

        blob = "blahblah $blah"
        (template_type, _renderer, _contents) = templater.detect_template(blob)
        self.assertIn("cheetah", template_type)
        self.assertEqual(blob, contents)

        blob = '##template:something-new'
        self.assertRaises(ValueError, templater.detect_template, blob)

    def test_render_cheetah(self):
        blob = '''## template:cheetah
$a,$b'''
        c = templater.render_string(blob, {"a": 1, "b": 2})
        self.assertEqual("1,2", c)

    def test_render_jinja(self):
        blob = '''## template:jinja
{{a}},{{b}}'''
        c = templater.render_string(blob, {"a": 1, "b": 2})
        self.assertEqual("1,2", c)

    def test_render_default(self):
        blob = '''$a,$b'''
        c = templater.render_string(blob, {"a": 1, "b": 2})
        self.assertEqual("1,2", c)

    def test_render_basic_deeper(self):
        hn = 'myfoohost.yahoo.com'
        expected_data = "h=%s\nc=d\n" % hn
        in_data = "h=$hostname.canonical_name\nc=d\n"
        params = {
            "hostname": {
                "canonical_name": hn,
            },
        }
        out_data = templater.render_string(in_data, params)
        self.assertEqual(expected_data, out_data)

    def test_render_basic_no_parens(self):
        hn = "myfoohost"
        in_data = "h=$hostname\nc=d\n"
        expected_data = "h=%s\nc=d\n" % hn
        out_data = templater.basic_render(in_data, {'hostname': hn})
        self.assertEqual(expected_data, out_data)

    def test_render_basic_parens(self):
        hn = "myfoohost"
        in_data = "h = ${hostname}\nc=d\n"
        expected_data = "h = %s\nc=d\n" % hn
        out_data = templater.basic_render(in_data, {'hostname': hn})
        self.assertEqual(expected_data, out_data)

    def test_render_basic2(self):
        mirror = "mymirror"
        codename = "zany"
        in_data = "deb $mirror $codename-updates main contrib non-free"
        ex_data = "deb %s %s-updates main contrib non-free" % (mirror,
                                                               codename)

        out_data = templater.basic_render(in_data,
                                          {'mirror': mirror,
                                           'codename': codename})
        self.assertEqual(ex_data, out_data)

    def test_jinja_nonascii_render_to_string(self):
        """Test jinja render_to_string with non-ascii content."""
        self.assertEqual(
            templater.render_string(
                self.add_header("jinja", self.jinja_utf8), {"name": "bob"}),
            self.jinja_utf8_rbob)

    def test_jinja_nonascii_render_undefined_variables_to_default_py3(self):
        """Test py3 jinja render_to_string with undefined variable default."""
        self.assertEqual(
            templater.render_string(
                self.add_header("jinja", self.jinja_utf8), {}),
            self.jinja_utf8_rbob.replace('bob', 'CI_MISSING_JINJA_VAR/name'))

    def test_jinja_nonascii_render_to_file(self):
        """Test jinja render_to_file of a filename with non-ascii content."""
        tmpl_fn = self.tmp_path("j-render-to-file.template")
        out_fn = self.tmp_path("j-render-to-file.out")
        write_file(filename=tmpl_fn, omode="wb",
                   content=self.add_header(
                       "jinja", self.jinja_utf8).encode('utf-8'))
        templater.render_to_file(tmpl_fn, out_fn, {"name": "bob"})
        result = load_file(out_fn, decode=False).decode('utf-8')
        self.assertEqual(result, self.jinja_utf8_rbob)

    def test_jinja_nonascii_render_from_file(self):
        """Test jinja render_from_file with non-ascii content."""
        tmpl_fn = self.tmp_path("j-render-from-file.template")
        write_file(tmpl_fn, omode="wb",
                   content=self.add_header(
                       "jinja", self.jinja_utf8).encode('utf-8'))
        result = templater.render_from_file(tmpl_fn, {"name": "bob"})
        self.assertEqual(result, self.jinja_utf8_rbob)

    @test_helpers.skipIfJinja()
    def test_jinja_warns_on_missing_dep_and_uses_basic_renderer(self):
        """Test jinja render_from_file will fallback to basic renderer."""
        tmpl_fn = self.tmp_path("j-render-from-file.template")
        write_file(tmpl_fn, omode="wb",
                   content=self.add_header(
                       "jinja", self.jinja_utf8).encode('utf-8'))
        result = templater.render_from_file(tmpl_fn, {"name": "bob"})
        self.assertEqual(result, self.jinja_utf8.decode())
        self.assertIn(
            'WARNING: Jinja not available as the selected renderer for desired'
            ' template, reverting to the basic renderer.',
            self.logs.getvalue())

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