# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import shutil
import subprocess
import sys
import tempfile
import textwrap
import unittest
from contextlib import ExitStack
from importlib import resources

from apache.thrift.ast.thrift_types import Ast
from apache.thrift.type.schema.thrift_types import ReturnType
from apache.thrift.type.standard.thrift_types import TypeName, TypeUri

from thrift.python.serializer import deserialize

file_manager = ExitStack()
thrift2ast = str(
    file_manager.enter_context(resources.path(__package__, "thrift2ast")).absolute()
)


def write_file(path, content):
    if d := os.path.dirname(path):
        os.makedirs(d)
    with open(path, "w") as f:
        f.write(content)


@unittest.skipIf(sys.platform.startswith("win"), "Windows is not supported")
class AstGeneratorTest(unittest.TestCase):
    def setUp(self):
        tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, tmp, True)
        self.tmp = tmp
        self.addCleanup(os.chdir, os.getcwd())
        os.chdir(self.tmp)
        self.maxDiff = None

    def run_thrift(self, file):
        with resources.as_file(
            resources.files(__package__).joinpath("implicit_includes")
        ) as inc:
            argsx = [
                thrift2ast,
                "--gen",
                "ast:protocol=compact,source_ranges",
                "-o",
                self.tmp,
                "-I",
                str(inc),
                file,
            ]
            p = subprocess.run(argsx, capture_output=True)
            print("exit status:", p.returncode)
            print("stdout:", p.stdout.decode())
            print("stderr:", p.stderr.decode())
            self.assertEqual(p.returncode, 0)

        with open(self.tmp + "/gen-ast/" + file[:-7] + ".ast", "rb") as f:
            encoded = f.read()
            return deserialize(Ast, encoded)

    def test_struct(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                struct Foo {
                    1: i64 int;
                }
                """
            ),
        )

        ast = self.run_thrift("foo.thrift")
        self.assertEqual(ast.definitions[0].structDef.attrs.name, "Foo")
        self.assertEqual(ast.definitions[0].structDef.fields[0].id, 1)
        srcRange = ast.definitions[0].structDef.attrs.sourceRange
        self.assertEqual(srcRange.programId, 1)
        self.assertEqual(srcRange.beginLine, 2)
        self.assertEqual(srcRange.beginColumn, 1)
        self.assertEqual(srcRange.endLine, 4)
        self.assertEqual(srcRange.endColumn, 2)

    def test_const_types(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                struct Foo {
                    1: i64 int;
                }

                const i16 answer = 42;
                const Foo structured = {"int": 1};
                const double coerced = 42;
                """
            ),
        )

        ast = self.run_thrift("foo.thrift")
        self.assertEqual(ast.definitions[1].constDef.attrs.name, "answer")
        self.assertEqual(ast.values[ast.definitions[1].constDef.value - 1].i16Value, 42)

        self.assertEqual(ast.definitions[2].constDef.attrs.name, "structured")
        self.assertEqual(
            ast.values[ast.definitions[2].constDef.value - 1]
            .objectValue.members[1]
            .i64Value,
            1,
        )

        self.assertEqual(ast.definitions[3].constDef.attrs.name, "coerced")
        self.assertEqual(
            ast.values[ast.definitions[3].constDef.value - 1].doubleValue, 42
        )

    def test_service(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                interaction I {}
                service Parent {}
                service Foo extends Parent {
                    void foo(1: string in) throws (1: Ex e);
                    i32 bar();
                    stream<string> baz();
                    i16, sink<i32 throws (1: Ex e), i64 throws (1: Ex e)> qux();
                    I startI();
                    performs I;
                }
                exception Ex {}
                """
            ),
        )

        ast = self.run_thrift("foo.thrift")
        serviceDef = ast.definitions[1].serviceDef
        self.assertEqual(serviceDef.attrs.name, "Foo")
        self.assertEqual(serviceDef.baseService.uri.scopedName, "foo.Parent")
        self.assertEqual(len(serviceDef.functions), 6)

        func = serviceDef.functions[0]
        self.assertEqual(func.attrs.name, "foo")
        self.assertEqual(func.returnTypes[0].thriftType.name.type, TypeName.Type.EMPTY)
        self.assertEqual(func.returnType.name.type, TypeName.Type.EMPTY)
        self.assertEqual(func.paramlist.fields[0].id, 1)
        self.assertEqual(func.paramlist.fields[0].attrs.name, "in")
        self.assertEqual(
            func.paramlist.fields[0].type.name.type, TypeName.Type.stringType
        )
        self.assertEqual(
            func.exceptions[0].type.name.exceptionType.scopedName, "foo.Ex"
        )
        self.assertEqual(func.streamOrSink, ReturnType())
        self.assertEqual(func.interactionType.uri, TypeUri())
        srcRange = func.attrs.sourceRange
        self.assertEqual(srcRange.programId, 1)
        self.assertEqual(srcRange.beginLine, 5)

        func = serviceDef.functions[1]
        self.assertEqual(func.attrs.name, "bar")
        self.assertEqual(
            func.returnTypes[0].thriftType.name.type, TypeName.Type.i32Type
        )
        self.assertEqual(func.returnType.name.type, TypeName.Type.i32Type)

        func = serviceDef.functions[2]
        self.assertEqual(func.attrs.name, "baz")
        self.assertEqual(len(func.returnTypes), 0)  # streams excluded
        self.assertEqual(func.returnType.name.type, TypeName.Type.EMPTY)
        self.assertEqual(
            func.streamOrSink.streamType.payload.name.type, TypeName.Type.stringType
        )

        func = serviceDef.functions[3]
        self.assertEqual(func.attrs.name, "qux")
        self.assertEqual(func.returnType.name.type, TypeName.Type.i16Type)
        self.assertEqual(
            func.streamOrSink.sinkType.payload.name.type, TypeName.Type.i32Type
        )
        self.assertEqual(len(func.streamOrSink.sinkType.clientExceptions), 1)
        self.assertEqual(
            func.streamOrSink.sinkType.finalResponse.name.type, TypeName.Type.i64Type
        )
        self.assertEqual(len(func.streamOrSink.sinkType.serverExceptions), 1)

        func = serviceDef.functions[4]
        self.assertEqual(func.attrs.name, "startI")
        self.assertEqual(func.returnType.name.type, TypeName.Type.EMPTY)
        self.assertEqual(func.interactionType.uri.scopedName, "foo.I")

        func = serviceDef.functions[5]
        self.assertEqual(func.attrs.name, "createI")
        self.assertEqual(func.returnType.name.type, TypeName.Type.EMPTY)
        self.assertEqual(func.interactionType.uri.scopedName, "foo.I")

    def test_docs(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                /** File docblock */
                namespace cpp2 foo
                /** This is a struct and its name is Foo. */
                struct Foo {
                    1: i64 Bar;  ///< This is a field and its name is Bar.
                }
                """
            ),
        )

        ast = self.run_thrift("foo.thrift")

        docs = ast.programs[0].attrs.docs
        self.assertEqual(docs.contents.rstrip(), "File docblock")
        self.assertEqual(docs.sourceRange.programId, 1)
        self.assertEqual(docs.sourceRange.beginLine, 2)

        self.assertEqual(ast.definitions[0].structDef.attrs.name, "Foo")
        srcRange = ast.definitions[0].structDef.attrs.sourceRange
        self.assertEqual(srcRange.programId, 1)
        self.assertEqual(srcRange.beginLine, 5)
        docs = ast.definitions[0].structDef.attrs.docs
        self.assertEqual(
            docs.contents.rstrip(), "This is a struct and its name is Foo."
        )
        self.assertEqual(docs.sourceRange.programId, 1)
        self.assertEqual(docs.sourceRange.beginLine, 4)
        self.assertEqual(docs.sourceRange.beginColumn, 1)
        self.assertEqual(docs.sourceRange.endLine, 4)
        self.assertEqual(docs.sourceRange.endColumn, 45)

        docs = ast.definitions[0].structDef.fields[0].attrs.docs
        self.assertEqual(docs.contents.rstrip(), "This is a field and its name is Bar.")
        if os.name == "nt":
            return  # line separators differ on windows and mess up source ranges
        self.assertEqual(docs.sourceRange.programId, 1)
        self.assertEqual(docs.sourceRange.beginLine, 6)
        self.assertEqual(docs.sourceRange.beginColumn, 18)
        self.assertEqual(docs.sourceRange.endLine, 7)
        self.assertEqual(docs.sourceRange.endColumn, 1)

    def test_program(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                package "test.dev/foo"
                namespace cpp2 facebook.foo
                include "bar.thrift"
                cpp_include "yarpl/Flowable.h"
                """
            ),
        )
        write_file("bar.thrift", "")

        ast = self.run_thrift("foo.thrift")
        program = ast.programs[0]
        self.assertEqual(program.attrs.name, "foo")
        self.assertEqual(program.attrs.uri, "test.dev/foo")
        self.assertEqual(program.path, "foo.thrift")
        self.assertEqual(program.languageIncludes, {"cpp": ["yarpl/Flowable.h"]})
        self.assertEqual(program.namespaces, {"cpp2": "facebook.foo"})
        self.assertEqual(program.includes, [2])

        self.assertEqual(ast.sources[1].fileName, "foo.thrift")
        self.assertEqual(
            ast.values[ast.sources[1].namespaces["cpp2"] - 1].stringValue,
            b"facebook.foo",
        )

    def test_annotation(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """
                struct Annot {}
                @Annot
                struct S {
                    @Annot
                    1: i32 field;
                }
                """
            ),
        )

        ast = self.run_thrift("foo.thrift")
        struct = ast.definitions[1].structDef

        # Inlined path
        self.assertIn("foo.Annot", struct.attrs.annotations)
        self.assertIn("foo.Annot", struct.fields[0].attrs.annotations)

        # Externed path
        annot_id = next(iter(struct.attrs.structuredAnnotations))
        annot = ast.values[annot_id - 1]
        # If standard library is not loaded this will have mapValue instead of objectValue
        self.assertEqual(
            annot.objectValue.members[1].objectValue.members[3].stringValue,
            b"foo.Annot",
        )
        self.assertEqual(
            annot.objectValue.type, "facebook.com/thrift/type/StructuredAnnotation"
        )

        # Field annot
        annot_id = next(iter(struct.fields[0].attrs.structuredAnnotations))
        annot = ast.values[annot_id - 1]
        self.assertEqual(
            annot.objectValue.members[1].objectValue.members[3].stringValue,
            b"foo.Annot",
        )

    def test_source_range_map(self):
        write_file(
            "foo.thrift",
            textwrap.dedent(
                """\
                struct A {1: B b;}
                struct B {}
                exception E {}
                typedef A T

                service S1 {}
                service S2 extends S1 {
                    B,
                    stream<A>
                     b (
                        1: T a
                    ) throws (
                        1: E e
                    );
                }

                enum Company {
                    FACEBOOK = 0,
                    WHATSAPP = 1,
                    OCULUS = 2,
                    INSTAGRAM = 3,
                }
                const string Title = "Software Engineer"
                struct Internship {
                    1: i32 weeks;
                    2: string title;
                    3: Company employer
                         = FACEBOOK;
                }
                const Internship instagram = {
                    "weeks": 12,
                    "title": Title,
                    "employer": Company.INSTAGRAM,
                };
                """
            ),
        )
        write_file(
            "bar.thrift",
            textwrap.dedent(
                """\
            include "foo.thrift"
            service S3 extends foo.S2 {}
            """
            ),
        )

        ast = self.run_thrift("foo.thrift")

        # To simplify the test we reduce the ranges to just their start lines and have a single span per line in the test file.
        spans = {}
        enumValue = None
        for ref in ast.identifierSourceRanges:
            spans[ref.range.beginLine] = ref.uri.scopedName.removeprefix("foo.")
            if ref.enumValue:
                enumValue = ref.enumValue
        self.assertDictEqual(
            spans,
            {
                1: "B",
                4: "A",
                7: "S1",
                8: "B",
                9: "A",
                11: "T",
                13: "E",
                27: "Company",
                28: "Company",
                30: "Internship",
                32: "Title",
                33: "Company",
            },
        )
        self.assertEqual(enumValue, "INSTAGRAM")

        ast = self.run_thrift("bar.thrift")
        spans = {}
        for ref in ast.identifierSourceRanges:
            spans[ref.range.beginLine] = ref.uri.scopedName
        self.assertDictEqual(
            spans,
            {2: "foo.S2"},
        )
        spans = {}
        for ref in ast.includeSourceRanges:
            spans[ref.range.beginLine] = ast.sources[ref.target].fileName
        self.assertDictEqual(
            spans,
            {1: "foo.thrift"},
        )