import os
import textwrap
import unittest

import yaml

from conan.api.conan_api import ConanAPI
from conan.internal.cache.cache import PkgCache
from conan.internal.cache.home_paths import HomePaths
from conan.internal.default_settings import default_settings_yml
from conans.model.conf import ConfDefinition
from conans.model.manifest import FileTreeManifest
from conans.model.options import Options
from conans.model.profile import Profile
from conans.model.recipe_ref import RecipeReference
from conans.model.settings import Settings
from conan.test.utils.test_files import temp_folder
from conan.test.utils.tools import GenConanfile
from conans.util.dates import revision_timestamp_now
from conans.util.files import save


class GraphManagerTest(unittest.TestCase):

    def setUp(self):
        cache_folder = temp_folder()
        cache = PkgCache(cache_folder, ConfDefinition())
        home = HomePaths(cache_folder)
        save(os.path.join(home.profiles_path, "default"), "")
        save(home.settings_path, "os: [Windows, Linux]")
        self.cache = cache
        self.cache_folder = cache_folder

    def recipe_cache(self, reference, requires=None, option_shared=None):
        ref = RecipeReference.loads(reference)
        conanfile = GenConanfile()
        if requires:
            for r in requires:
                conanfile.with_require(r)
        if option_shared is not None:
            conanfile.with_option("shared", [True, False])
            conanfile.with_default_option("shared", option_shared)

        self._put_in_cache(ref, conanfile)

    def recipe_conanfile(self, reference, conanfile):
        ref = RecipeReference.loads(reference)
        self._put_in_cache(ref, conanfile)

    def _put_in_cache(self, ref, conanfile):
        ref = RecipeReference.loads("{}#123".format(ref))
        ref.timestamp = revision_timestamp_now()
        layout = self.cache.create_ref_layout(ref)
        save(layout.conanfile(), str(conanfile))
        manifest = FileTreeManifest.create(layout.export())
        manifest.save(layout.export())

    def _cache_recipe(self, ref, test_conanfile, revision=None):
        # FIXME: This seems duplicated
        if not isinstance(ref, RecipeReference):
            ref = RecipeReference.loads(ref)
        ref = RecipeReference.loads(repr(ref) + "#{}".format(revision or 123))  # FIXME: Make access
        ref.timestamp = revision_timestamp_now()
        recipe_layout = self.cache.create_ref_layout(ref)
        save(recipe_layout.conanfile(), str(test_conanfile))
        manifest = FileTreeManifest.create(recipe_layout.export())
        manifest.save(recipe_layout.export())

    def alias_cache(self, alias, target):
        ref = RecipeReference.loads(alias)
        conanfile = textwrap.dedent("""
            from conan import ConanFile
            class Alias(ConanFile):
                alias = "%s"
            """ % target)
        self._put_in_cache(ref, conanfile)

    @staticmethod
    def recipe_consumer(reference=None, requires=None, build_requires=None, tool_requires=None):
        path = temp_folder()
        path = os.path.join(path, "conanfile.py")
        conanfile = GenConanfile()
        if reference:
            ref = RecipeReference.loads(reference)
            conanfile.with_name(ref.name).with_version(ref.version)
        if requires:
            for r in requires:
                conanfile.with_require(r)
        if build_requires:
            for r in build_requires:
                conanfile.with_build_requires(r)
        if tool_requires:
            for r in tool_requires:
                conanfile.with_tool_requires(r)
        save(path, str(conanfile))
        return path

    @staticmethod
    def consumer_conanfile(conanfile):
        path = temp_folder()
        path = os.path.join(path, "conanfile.py")
        save(path, str(conanfile))
        return path

    def build_graph(self, content, profile_build_requires=None, ref=None, create_ref=None,
                    install=True, options_build=None):
        path = temp_folder()
        path = os.path.join(path, "conanfile.py")
        save(path, str(content))
        return self.build_consumer(path, profile_build_requires, ref, create_ref, install,
                                   options_build=options_build)

    def build_consumer(self, path, profile_build_requires=None, ref=None, create_ref=None,
                       install=True, options_build=None):
        profile_host = Profile()
        profile_host.settings["os"] = "Linux"
        profile_build = Profile()
        profile_build.settings["os"] = "Windows"
        if profile_build_requires:
            profile_host.tool_requires = profile_build_requires
        if options_build:
            profile_build.options = Options(options_values=options_build)
        cache_settings = Settings(yaml.safe_load(default_settings_yml))
        profile_host.process_settings(cache_settings)
        profile_build.process_settings(cache_settings)
        build_mode = ["*"]  # Means build all

        conan_api = ConanAPI(cache_folder=self.cache_folder)

        deps_graph = conan_api.graph.load_graph_consumer(path, None, None, None, None,
                                                         profile_host, profile_build, None, None,
                                                         None)

        if install:
            deps_graph.report_graph_error()
            conan_api.graph.analyze_binaries(deps_graph, build_mode)
            conan_api.install.install_binaries(deps_graph)

        return deps_graph

    def _check_node(self, node, ref, deps=None, dependents=None, settings=None, options=None):
        dependents = dependents or []
        deps = deps or []

        conanfile = node.conanfile
        ref = RecipeReference.loads(str(ref))
        self.assertEqual(node.ref, ref)
        if conanfile:
            self.assertEqual(conanfile.name, ref.name)

        self.assertEqual(len(node.dependencies), len(deps))
        for d in node.neighbors():
            assert d in deps

        dependants = node.inverse_neighbors()
        self.assertEqual(len(dependants), len(dependents))
        for d in dependents:
            self.assertIn(d, dependants)

        if settings is not None:
            for k, v in settings.items():
                assert conanfile.settings.get_safe(k) == v

        if options is not None:
            for k, v in options.items():
                assert conanfile.options.get_safe(k) == v
