"""Command line interface tests for llvm.py configure.

Note that although this uses the unittest framework, it does *not* contain unit
tests.

"""
from os import path
from subprocess import CalledProcessError
from tempfile import mkdtemp
from uuid import uuid4

from llvmtestcase import LLVMTestCase, require_command_arg, debug


class Testllvmconfigure(LLVMTestCase):

    @classmethod
    def llvm_configure(cls, *args, **kwargs):
        return cls.command_with_defaults("configure", *args, **kwargs)

    @classmethod
    def setUpClass(cls):
        cls.env = mkdtemp()

        cls.llvm_repo = path.join(cls.env, "llvm-repo")
        cls.create_dummy_repo(cls.llvm_repo)

        cls.llvm_worktree = path.join(cls.env, "llvm")
        cls.add_worktree(cls.llvm_repo, cls.llvm_worktree, "br")

    @require_command_arg("--source-dir")
    def test_source_dir_is_compulsory(self):
        """Test that we get an error if we don't pass the source dir."""
        self.run_with_output(self.llvm_configure("--build-dir", "anywhere"))

    @require_command_arg("--build-dir")
    def test_build_dir_is_compulsory(self):
        """Test that we get an error if we don't pass the build dir."""
        self.run_with_output(
            self.llvm_configure("--source-dir", self.llvm_worktree))

    def test_default_args(self):
        """Test that we can get a simple configure command."""
        output = self.run_with_output(self.llvm_configure("--dry-run",
                                                          "--source-dir",
                                                          self.llvm_worktree,
                                                          "--build-dir",
                                                          "anywhere"))
        self.assertRegex(output,
                         "anywhere\$ cmake -G Ninja .* {}".format(self.llvm_worktree))

    def test_generator(self):
        """Test that we can specify a custom generator."""
        output = self.run_with_output(self.llvm_configure("--dry-run",
                                                          "--source-dir",
                                                          self.llvm_worktree,
                                                          "--build-dir",
                                                          "anywhere",
                                                          "--cmake-generator",
                                                          "\"Unix Makefiles\""))
        self.assertRegex(output,
            "anywhere\$ cmake -G \"Unix Makefiles\" .* {}".format(self.llvm_worktree))

    def test_cmake_vars(self):
        """Test that we can specify custom cmake variables."""
        output = self.run_with_output(self.llvm_configure(
            "--dry-run",
            "--source-dir", self.llvm_worktree,
            "--build-dir", "anywhere",
            "--cmake-def", "VAR1=VAL1",
            "--cmake-def", "VAR2=\"-not --so simple\""))

        self.assertRegex(output,
            "anywhere\$ cmake -G Ninja .* -DVAR1=VAL1 -DVAR2=\"-not --so simple\" {}".format(self.llvm_worktree))

    def test_create_build_dir(self):
        """
        Test that we create the build directory if it doesn't already exist (but
        not in dry-run).
        """
        buildDir = path.join(self.env, "brand-new-build-dir")
        self.assertFalse(path.isdir(buildDir))

        self.run_with_output(self.llvm_configure("--dry-run",
            "--source-dir", self.llvm_worktree,
            "--build-dir", buildDir))
        self.assertFalse(path.isdir(buildDir))

        # When not running in dry run mode, we're going to try to execute a
        # CMake command that's going to fail because we don't have a valid LLVM
        # source directory. This is fine, since the purpose of this test isn't
        # to check the integration with CMake.
        with self.assertRaises(Exception) as context:
            print(self.run_with_output(self.llvm_configure(
                "--source-dir", self.llvm_worktree,
                "--build-dir", buildDir)))

        self.assertTrue(path.isdir(buildDir))