// Copyright 2021 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 "gmock/gmock.h"
#include "src/tint/ast/variable_decl_statement.h"
#include "src/tint/writer/glsl/test_helper.h"

using namespace tint::number_suffixes;  // NOLINT

namespace tint::writer::glsl {
namespace {

using ::testing::HasSubstr;

using GlslGeneratorImplTest_VariableDecl = TestHelper;

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement) {
    auto* var = Var("a", ty.f32());
    auto* stmt = Decl(var);
    WrapInFunction(stmt);

    GeneratorImpl& gen = Build();

    gen.increment_indent();

    ASSERT_TRUE(gen.EmitStatement(stmt)) << gen.error();
    EXPECT_EQ(gen.result(), "  float a = 0.0f;\n");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Let) {
    auto* var = Let("a", ty.f32(), Construct(ty.f32()));
    auto* stmt = Decl(var);
    WrapInFunction(stmt);

    GeneratorImpl& gen = Build();

    gen.increment_indent();

    ASSERT_TRUE(gen.EmitStatement(stmt)) << gen.error();
    EXPECT_EQ(gen.result(), "  float a = 0.0f;\n");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const) {
    auto* var = Const("a", ty.f32(), Construct(ty.f32()));
    auto* stmt = Decl(var);
    WrapInFunction(stmt);

    GeneratorImpl& gen = Build();

    gen.increment_indent();

    ASSERT_TRUE(gen.EmitStatement(stmt)) << gen.error();
    EXPECT_EQ(gen.result(), "");  // Not a mistake - 'const' is inlined
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_AInt) {
    auto* C = Const("C", nullptr, Expr(1_a));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  int l = 1;
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_AFloat) {
    auto* C = Const("C", nullptr, Expr(1._a));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  float l = 1.0f;
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_i32) {
    auto* C = Const("C", nullptr, Expr(1_i));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  int l = 1;
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_u32) {
    auto* C = Const("C", nullptr, Expr(1_u));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  uint l = 1u;
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_f32) {
    auto* C = Const("C", nullptr, Expr(1_f));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  float l = 1.0f;
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_vec3_AInt) {
    auto* C = Const("C", nullptr, Construct(ty.vec3(nullptr), 1_a, 2_a, 3_a));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  ivec3 l = ivec3(1, 2, 3);
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_vec3_AFloat) {
    auto* C = Const("C", nullptr, Construct(ty.vec3(nullptr), 1._a, 2._a, 3._a));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  vec3 l = vec3(1.0f, 2.0f, 3.0f);
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_vec3_f32) {
    auto* C = Const("C", nullptr, vec3<f32>(1_f, 2_f, 3_f));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  vec3 l = vec3(1.0f, 2.0f, 3.0f);
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_mat2x3_AFloat) {
    auto* C =
        Const("C", nullptr, Construct(ty.mat(nullptr, 2, 3), 1._a, 2._a, 3._a, 4._a, 5._a, 6._a));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  mat2x3 l = mat2x3(vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f));
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_mat2x3_f32) {
    auto* C = Const("C", nullptr, mat2x3<f32>(1_f, 2_f, 3_f, 4_f, 5_f, 6_f));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  mat2x3 l = mat2x3(vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f));
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_arr_f32) {
    auto* C = Const("C", nullptr, Construct(ty.array<f32, 3>(), 1_f, 2_f, 3_f));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  float l[3] = float[3](1.0f, 2.0f, 3.0f);
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Const_arr_vec2_bool) {
    auto* C = Const("C", nullptr,
                    Construct(ty.array(ty.vec2<bool>(), 3_u),  //
                              vec2<bool>(true, false),         //
                              vec2<bool>(false, true),         //
                              vec2<bool>(true, true)));
    Func("f", {}, ty.void_(), {Decl(C), Decl(Let("l", nullptr, Expr(C)))});

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.error();

    EXPECT_EQ(gen.result(), R"(#version 310 es

void f() {
  bvec2 l[3] = bvec2[3](bvec2(true, false), bvec2(false, true), bvec2(true));
}

)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Array) {
    auto* var = Var("a", ty.array<f32, 5>());

    WrapInFunction(var, Expr("a"));

    GeneratorImpl& gen = Build();

    gen.increment_indent();

    ASSERT_TRUE(gen.Generate()) << gen.error();
    EXPECT_THAT(gen.result(),
                HasSubstr("  float a[5] = float[5](0.0f, 0.0f, 0.0f, 0.0f, 0.0f);\n"));
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Private) {
    GlobalVar("a", ty.f32(), ast::StorageClass::kPrivate);

    WrapInFunction(Expr("a"));

    GeneratorImpl& gen = Build();

    gen.increment_indent();

    ASSERT_TRUE(gen.Generate()) << gen.error();
    EXPECT_THAT(gen.result(), HasSubstr("  float a = 0.0f;\n"));
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Initializer_ZeroVec) {
    auto* var = Var("a", ty.vec3<f32>(), ast::StorageClass::kNone, vec3<f32>());

    auto* stmt = Decl(var);
    WrapInFunction(stmt);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.EmitStatement(stmt)) << gen.error();
    EXPECT_EQ(gen.result(), R"(vec3 a = vec3(0.0f);
)");
}

TEST_F(GlslGeneratorImplTest_VariableDecl, Emit_VariableDeclStatement_Initializer_ZeroMat) {
    auto* var = Var("a", ty.mat2x3<f32>(), ast::StorageClass::kNone, mat2x3<f32>());

    auto* stmt = Decl(var);
    WrapInFunction(stmt);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.EmitStatement(stmt)) << gen.error();
    EXPECT_EQ(gen.result(),
              R"(mat2x3 a = mat2x3(vec3(0.0f), vec3(0.0f));
)");
}

}  // namespace
}  // namespace tint::writer::glsl