// Copyright 2020 The Tint Authors.
//
// 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.

#include "gtest/gtest-spi.h"
#include "src/tint/ast/discard_statement.h"
#include "src/tint/ast/stage_attribute.h"
#include "src/tint/ast/test_helper.h"
#include "src/tint/ast/workgroup_attribute.h"

using namespace tint::number_suffixes;  // NOLINT

namespace tint::ast {
namespace {

using FunctionTest = TestHelper;

TEST_F(FunctionTest, Creation) {
    utils::Vector params{Param("var", ty.i32())};
    auto* var = params[0];

    auto* f = Func("func", params, ty.void_(), utils::Empty);
    EXPECT_EQ(f->symbol, Symbols().Get("func"));
    ASSERT_EQ(f->params.Length(), 1u);
    EXPECT_TRUE(f->return_type->Is<ast::Void>());
    EXPECT_EQ(f->params[0], var);
}

TEST_F(FunctionTest, Creation_WithSource) {
    utils::Vector params{Param("var", ty.i32())};

    auto* f = Func(Source{Source::Location{20, 2}}, "func", params, ty.void_(), utils::Empty);
    auto src = f->source;
    EXPECT_EQ(src.range.begin.line, 20u);
    EXPECT_EQ(src.range.begin.column, 2u);
}

TEST_F(FunctionTest, Assert_InvalidName) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            b.Func("", utils::Empty, b.ty.void_(), utils::Empty);
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_Null_ReturnType) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            b.Func("f", utils::Empty, nullptr, utils::Empty);
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_Null_Param) {
    using ParamList = utils::Vector<const ast::Parameter*, 2>;
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            ParamList params;
            params.Push(b.Param("var", b.ty.i32()));
            params.Push(nullptr);
            b.Func("f", params, b.ty.void_(), utils::Empty);
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_DifferentProgramID_Symbol) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.Func(b2.Sym("func"), utils::Empty, b1.ty.void_(), utils::Empty);
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_DifferentProgramID_Param) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.Func("func",
                    utils::Vector{
                        b2.Param("var", b2.ty.i32()),
                    },
                    b1.ty.void_(), utils::Empty);
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_DifferentProgramID_Attr) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.Func("func", utils::Empty, b1.ty.void_(), utils::Empty,
                    utils::Vector{
                        b2.WorkgroupSize(2_i, 4_i, 6_i),
                    });
        },
        "internal compiler error");
}

TEST_F(FunctionTest, Assert_DifferentProgramID_ReturnAttr) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.Func("func", utils::Empty, b1.ty.void_(), utils::Empty, utils::Empty,
                    utils::Vector{
                        b2.WorkgroupSize(2_i, 4_i, 6_i),
                    });
        },
        "internal compiler error");
}

using FunctionListTest = TestHelper;

TEST_F(FunctionListTest, FindSymbol) {
    auto* func = Func("main", utils::Empty, ty.f32(), utils::Empty);
    FunctionList list;
    list.Add(func);
    EXPECT_EQ(func, list.Find(Symbols().Register("main")));
}

TEST_F(FunctionListTest, FindSymbolMissing) {
    FunctionList list;
    EXPECT_EQ(nullptr, list.Find(Symbols().Register("Missing")));
}

TEST_F(FunctionListTest, FindSymbolStage) {
    auto* fs = Func("main", utils::Empty, ty.f32(), utils::Empty,
                    utils::Vector{
                        Stage(PipelineStage::kFragment),
                    });
    auto* vs = Func("main", utils::Empty, ty.f32(), utils::Empty,
                    utils::Vector{
                        Stage(PipelineStage::kVertex),
                    });
    FunctionList list;
    list.Add(fs);
    list.Add(vs);
    EXPECT_EQ(fs, list.Find(Symbols().Register("main"), PipelineStage::kFragment));
    EXPECT_EQ(vs, list.Find(Symbols().Register("main"), PipelineStage::kVertex));
}

TEST_F(FunctionListTest, FindSymbolStageMissing) {
    FunctionList list;
    list.Add(Func("main", utils::Empty, ty.f32(), utils::Empty,
                  utils::Vector{
                      Stage(PipelineStage::kFragment),
                  }));
    EXPECT_EQ(nullptr, list.Find(Symbols().Register("main"), PipelineStage::kVertex));
}

TEST_F(FunctionListTest, HasStage) {
    FunctionList list;
    list.Add(Func("main", utils::Empty, ty.f32(), utils::Empty,
                  utils::Vector{
                      Stage(PipelineStage::kFragment),
                  }));
    EXPECT_TRUE(list.HasStage(PipelineStage::kFragment));
    EXPECT_FALSE(list.HasStage(PipelineStage::kVertex));
}

}  // namespace
}  // namespace tint::ast