# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

import unittest

import mozpack.path as mozpath
from mozunit import main

from mozbuild.frontend.context import (
    FUNCTIONS,
    SPECIAL_VARIABLES,
    VARIABLES,
    Context,
    SourcePath,
)
from mozbuild.frontend.reader import MozbuildSandbox, SandboxCalledError
from mozbuild.frontend.sandbox import Sandbox, SandboxExecutionError, SandboxLoadError
from mozbuild.test.common import MockConfig

test_data_path = mozpath.abspath(mozpath.dirname(__file__))
test_data_path = mozpath.join(test_data_path, "data")


class TestSandbox(unittest.TestCase):
    def sandbox(self):
        return Sandbox(
            Context(
                {
                    "DIRS": (list, list, None),
                }
            )
        )

    def test_exec_source_success(self):
        sandbox = self.sandbox()
        context = sandbox._context

        sandbox.exec_source("foo = True", mozpath.abspath("foo.py"))

        self.assertNotIn("foo", context)
        self.assertEqual(context.main_path, mozpath.abspath("foo.py"))
        self.assertEqual(context.all_paths, set([mozpath.abspath("foo.py")]))

    def test_exec_compile_error(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source("2f23;k;asfj", mozpath.abspath("foo.py"))

        self.assertEqual(se.exception.file_stack, [mozpath.abspath("foo.py")])
        self.assertIsInstance(se.exception.exc_value, SyntaxError)
        self.assertEqual(sandbox._context.main_path, mozpath.abspath("foo.py"))

    def test_exec_import_denied(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source("import sys")

        self.assertIsInstance(se.exception, SandboxExecutionError)
        self.assertEqual(se.exception.exc_type, ImportError)

    def test_exec_source_multiple(self):
        sandbox = self.sandbox()

        sandbox.exec_source('DIRS = ["foo"]')
        sandbox.exec_source('DIRS += ["bar"]')

        self.assertEqual(sandbox["DIRS"], ["foo", "bar"])

    def test_exec_source_illegal_key_set(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source("ILLEGAL = True")

        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertEqual(e.args[0], "global_ns")
        self.assertEqual(e.args[1], "set_unknown")

    def test_exec_source_reassign(self):
        sandbox = self.sandbox()

        sandbox.exec_source('DIRS = ["foo"]')
        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source('DIRS = ["bar"]')

        self.assertEqual(sandbox["DIRS"], ["foo"])
        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertEqual(e.args[0], "global_ns")
        self.assertEqual(e.args[1], "reassign")
        self.assertEqual(e.args[2], "DIRS")

    def test_exec_source_reassign_builtin(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source("sorted = 1")

        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertEqual(e.args[0], "Cannot reassign builtins")


class TestedSandbox(MozbuildSandbox):
    """Version of MozbuildSandbox with a little more convenience for testing.

    It automatically normalizes paths given to exec_file and exec_source. This
    helps simplify the test code.
    """

    def normalize_path(self, path):
        return mozpath.normpath(mozpath.join(self._context.config.topsrcdir, path))

    def source_path(self, path):
        return SourcePath(self._context, path)

    def exec_file(self, path):
        super(TestedSandbox, self).exec_file(self.normalize_path(path))

    def exec_source(self, source, path=""):
        super(TestedSandbox, self).exec_source(
            source, self.normalize_path(path) if path else ""
        )


class TestMozbuildSandbox(unittest.TestCase):
    def sandbox(self, data_path=None, metadata={}):
        config = None

        if data_path is not None:
            config = MockConfig(mozpath.join(test_data_path, data_path))
        else:
            config = MockConfig()

        return TestedSandbox(Context(VARIABLES, config), metadata)

    def test_default_state(self):
        sandbox = self.sandbox()
        sandbox._context.add_source(sandbox.normalize_path("moz.build"))
        config = sandbox._context.config

        self.assertEqual(sandbox["TOPSRCDIR"], config.topsrcdir)
        self.assertEqual(sandbox["TOPOBJDIR"], config.topobjdir)
        self.assertEqual(sandbox["RELATIVEDIR"], "")
        self.assertEqual(sandbox["SRCDIR"], config.topsrcdir)
        self.assertEqual(sandbox["OBJDIR"], config.topobjdir)

    def test_symbol_presence(self):
        # Ensure no discrepancies between the master symbol table and what's in
        # the sandbox.
        sandbox = self.sandbox()
        sandbox._context.add_source(sandbox.normalize_path("moz.build"))

        all_symbols = set()
        all_symbols |= set(FUNCTIONS.keys())
        all_symbols |= set(SPECIAL_VARIABLES.keys())

        for symbol in all_symbols:
            self.assertIsNotNone(sandbox[symbol])

    def test_path_calculation(self):
        sandbox = self.sandbox()
        sandbox._context.add_source(sandbox.normalize_path("foo/bar/moz.build"))
        config = sandbox._context.config

        self.assertEqual(sandbox["TOPSRCDIR"], config.topsrcdir)
        self.assertEqual(sandbox["TOPOBJDIR"], config.topobjdir)
        self.assertEqual(sandbox["RELATIVEDIR"], "foo/bar")
        self.assertEqual(sandbox["SRCDIR"], mozpath.join(config.topsrcdir, "foo/bar"))
        self.assertEqual(sandbox["OBJDIR"], mozpath.join(config.topobjdir, "foo/bar"))

    def test_config_access(self):
        sandbox = self.sandbox()
        config = sandbox._context.config

        self.assertEqual(sandbox["CONFIG"]["MOZ_TRUE"], "1")
        self.assertEqual(sandbox["CONFIG"]["MOZ_FOO"], config.substs["MOZ_FOO"])

        # Access to an undefined substitution should return None.
        self.assertNotIn("MISSING", sandbox["CONFIG"])
        self.assertIsNone(sandbox["CONFIG"]["MISSING"])

        # Should shouldn't be allowed to assign to the config.
        with self.assertRaises(Exception):
            sandbox["CONFIG"]["FOO"] = ""

    def test_special_variables(self):
        sandbox = self.sandbox()
        sandbox._context.add_source(sandbox.normalize_path("moz.build"))

        for k in SPECIAL_VARIABLES:
            with self.assertRaises(KeyError):
                sandbox[k] = 0

    def test_exec_source_reassign_exported(self):
        template_sandbox = self.sandbox(data_path="templates")

        # Templates need to be defined in actual files because of
        # inspect.getsourcelines.
        template_sandbox.exec_file("templates.mozbuild")

        config = MockConfig()

        exports = {"DIST_SUBDIR": "browser"}

        sandbox = TestedSandbox(
            Context(VARIABLES, config),
            metadata={
                "exports": exports,
                "templates": template_sandbox.templates,
            },
        )

        self.assertEqual(sandbox["DIST_SUBDIR"], "browser")

        # Templates should not interfere
        sandbox.exec_source("Template([])", "foo.mozbuild")

        sandbox.exec_source('DIST_SUBDIR = "foo"')
        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source('DIST_SUBDIR = "bar"')

        self.assertEqual(sandbox["DIST_SUBDIR"], "foo")
        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertEqual(e.args[0], "global_ns")
        self.assertEqual(e.args[1], "reassign")
        self.assertEqual(e.args[2], "DIST_SUBDIR")

    def test_include_basic(self):
        sandbox = self.sandbox(data_path="include-basic")

        sandbox.exec_file("moz.build")

        self.assertEqual(
            sandbox["DIRS"],
            [
                sandbox.source_path("foo"),
                sandbox.source_path("bar"),
            ],
        )
        self.assertEqual(
            sandbox._context.main_path, sandbox.normalize_path("moz.build")
        )
        self.assertEqual(len(sandbox._context.all_paths), 2)

    def test_include_outside_topsrcdir(self):
        sandbox = self.sandbox(data_path="include-outside-topsrcdir")

        with self.assertRaises(SandboxLoadError) as se:
            sandbox.exec_file("relative.build")

        self.assertEqual(
            se.exception.illegal_path, sandbox.normalize_path("../moz.build")
        )

    def test_include_error_stack(self):
        # Ensure the path stack is reported properly in exceptions.
        sandbox = self.sandbox(data_path="include-file-stack")

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_file("moz.build")

        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        args = e.exc_value.args
        self.assertEqual(args[0], "global_ns")
        self.assertEqual(args[1], "set_unknown")
        self.assertEqual(args[2], "ILLEGAL")

        expected_stack = [
            mozpath.join(sandbox._context.config.topsrcdir, p)
            for p in ["moz.build", "included-1.build", "included-2.build"]
        ]

        self.assertEqual(e.file_stack, expected_stack)

    def test_include_missing(self):
        sandbox = self.sandbox(data_path="include-missing")

        with self.assertRaises(SandboxLoadError) as sle:
            sandbox.exec_file("moz.build")

        self.assertIsNotNone(sle.exception.read_error)

    def test_include_relative_from_child_dir(self):
        # A relative path from a subdirectory should be relative from that
        # child directory.
        sandbox = self.sandbox(data_path="include-relative-from-child")
        sandbox.exec_file("child/child.build")
        self.assertEqual(sandbox["DIRS"], [sandbox.source_path("../foo")])

        sandbox = self.sandbox(data_path="include-relative-from-child")
        sandbox.exec_file("child/child2.build")
        self.assertEqual(sandbox["DIRS"], [sandbox.source_path("../foo")])

    def test_include_topsrcdir_relative(self):
        # An absolute path for include() is relative to topsrcdir.

        sandbox = self.sandbox(data_path="include-topsrcdir-relative")
        sandbox.exec_file("moz.build")

        self.assertEqual(sandbox["DIRS"], [sandbox.source_path("foo")])

    def test_error(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxCalledError) as sce:
            sandbox.exec_source('error("This is an error.")')

        e = sce.exception.message
        self.assertIn("This is an error.", str(e))

    def test_substitute_config_files(self):
        sandbox = self.sandbox()
        sandbox._context.add_source(sandbox.normalize_path("moz.build"))

        sandbox.exec_source('CONFIGURE_SUBST_FILES += ["bar", "foo"]')
        self.assertEqual(sandbox["CONFIGURE_SUBST_FILES"], ["bar", "foo"])
        for item in sandbox["CONFIGURE_SUBST_FILES"]:
            self.assertIsInstance(item, SourcePath)

    def test_invalid_exports_set_base(self):
        sandbox = self.sandbox()

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox.exec_source('EXPORTS = "foo.h"')

        self.assertEqual(se.exception.exc_type, ValueError)

    def test_templates(self):
        sandbox = self.sandbox(data_path="templates")

        # Templates need to be defined in actual files because of
        # inspect.getsourcelines.
        sandbox.exec_file("templates.mozbuild")

        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
Template([
    'foo.cpp',
])
"""
        sandbox2.exec_source(source, "foo.mozbuild")

        self.assertEqual(
            sandbox2._context,
            {
                "SOURCES": ["foo.cpp"],
                "DIRS": [],
            },
        )

        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
SOURCES += ['qux.cpp']
Template([
    'bar.cpp',
    'foo.cpp',
],[
    'foo',
])
SOURCES += ['hoge.cpp']
"""
        sandbox2.exec_source(source, "foo.mozbuild")

        self.assertEqual(
            sandbox2._context,
            {
                "SOURCES": ["qux.cpp", "bar.cpp", "foo.cpp", "hoge.cpp"],
                "DIRS": [sandbox2.source_path("foo")],
            },
        )

        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
TemplateError([
    'foo.cpp',
])
"""
        with self.assertRaises(SandboxExecutionError) as se:
            sandbox2.exec_source(source, "foo.mozbuild")

        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertEqual(e.args[0], "global_ns")
        self.assertEqual(e.args[1], "set_unknown")

        # TemplateGlobalVariable tries to access 'illegal' but that is expected
        # to throw.
        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
illegal = True
TemplateGlobalVariable()
"""
        with self.assertRaises(SandboxExecutionError) as se:
            sandbox2.exec_source(source, "foo.mozbuild")

        e = se.exception
        self.assertIsInstance(e.exc_value, NameError)

        # TemplateGlobalUPPERVariable sets SOURCES with DIRS, but the context
        # used when running the template is not expected to access variables
        # from the global context.
        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
DIRS += ['foo']
TemplateGlobalUPPERVariable()
"""
        sandbox2.exec_source(source, "foo.mozbuild")
        self.assertEqual(
            sandbox2._context,
            {
                "SOURCES": [],
                "DIRS": [sandbox2.source_path("foo")],
            },
        )

        # However, the result of the template is mixed with the global
        # context.
        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
SOURCES += ['qux.cpp']
TemplateInherit([
    'bar.cpp',
    'foo.cpp',
])
SOURCES += ['hoge.cpp']
"""
        sandbox2.exec_source(source, "foo.mozbuild")

        self.assertEqual(
            sandbox2._context,
            {
                "SOURCES": ["qux.cpp", "bar.cpp", "foo.cpp", "hoge.cpp"],
                "USE_LIBS": ["foo"],
                "DIRS": [],
            },
        )

        # Template names must be CamelCase. Here, we can define the template
        # inline because the error happens before inspect.getsourcelines.
        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
@template
def foo():
    pass
"""

        with self.assertRaises(SandboxExecutionError) as se:
            sandbox2.exec_source(source, "foo.mozbuild")

        e = se.exception
        self.assertIsInstance(e.exc_value, NameError)

        e = se.exception.exc_value
        self.assertIn("Template function names must be CamelCase.", str(e))

        # Template names must not already be registered.
        sandbox2 = self.sandbox(metadata={"templates": sandbox.templates})
        source = """
@template
def Template():
    pass
"""
        with self.assertRaises(SandboxExecutionError) as se:
            sandbox2.exec_source(source, "foo.mozbuild")

        e = se.exception
        self.assertIsInstance(e.exc_value, KeyError)

        e = se.exception.exc_value
        self.assertIn(
            'A template named "Template" was already declared in %s.'
            % sandbox.normalize_path("templates.mozbuild"),
            str(e),
        )

    def test_function_args(self):
        class Foo(int):
            pass

        def foo(a, b):
            return type(a), type(b)

        FUNCTIONS.update(
            {
                "foo": (lambda self: foo, (Foo, int), ""),
            }
        )

        try:
            sandbox = self.sandbox()
            source = 'foo("a", "b")'

            with self.assertRaises(SandboxExecutionError) as se:
                sandbox.exec_source(source, "foo.mozbuild")

            e = se.exception
            self.assertIsInstance(e.exc_value, ValueError)

            sandbox = self.sandbox()
            source = 'foo(1, "b")'

            with self.assertRaises(SandboxExecutionError) as se:
                sandbox.exec_source(source, "foo.mozbuild")

            e = se.exception
            self.assertIsInstance(e.exc_value, ValueError)

            sandbox = self.sandbox()
            source = "a = foo(1, 2)"
            sandbox.exec_source(source, "foo.mozbuild")

            self.assertEqual(sandbox["a"], (Foo, int))
        finally:
            del FUNCTIONS["foo"]


if __name__ == "__main__":
    main()