// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/lang/core/fluent_types.h"
#include "src/tint/lang/msl/writer/ast_printer/helper_test.h"
#include "src/tint/utils/text/string_stream.h"

using namespace tint::core::fluent_types;  // NOLINT

namespace tint::msl::writer {
namespace {

using MslUnaryOpTest = TestHelper;

TEST_F(MslUnaryOpTest, AddressOf) {
    GlobalVar("expr", ty.f32(), core::AddressSpace::kPrivate);
    auto* op = create<ast::UnaryOpExpression>(core::UnaryOp::kAddressOf, Expr("expr"));
    WrapInFunction(op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "&(expr)");
}

TEST_F(MslUnaryOpTest, Complement) {
    GlobalVar("expr", ty.i32(), core::AddressSpace::kPrivate);
    auto* op = create<ast::UnaryOpExpression>(core::UnaryOp::kComplement, Expr("expr"));
    WrapInFunction(op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "~(expr)");
}

TEST_F(MslUnaryOpTest, Indirection) {
    GlobalVar("G", ty.f32(), core::AddressSpace::kPrivate);
    auto* p = Let("expr", create<ast::UnaryOpExpression>(core::UnaryOp::kAddressOf, Expr("G")));
    auto* op = create<ast::UnaryOpExpression>(core::UnaryOp::kIndirection, Expr("expr"));
    WrapInFunction(p, op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "*(expr)");
}

TEST_F(MslUnaryOpTest, Not) {
    GlobalVar("expr", ty.bool_(), core::AddressSpace::kPrivate);
    auto* op = create<ast::UnaryOpExpression>(core::UnaryOp::kNot, Expr("expr"));
    WrapInFunction(op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "!(expr)");
}

TEST_F(MslUnaryOpTest, Negation) {
    GlobalVar("expr", ty.i32(), core::AddressSpace::kPrivate);
    auto* op = create<ast::UnaryOpExpression>(core::UnaryOp::kNegation, Expr("expr"));
    WrapInFunction(op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "tint_unary_minus(expr)");
}

TEST_F(MslUnaryOpTest, IntMin) {
    auto* op = Expr(i32(std::numeric_limits<int32_t>::min()));
    WrapInFunction(op);

    ASTPrinter& gen = Build();

    StringStream out;
    ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.Diagnostics();
    EXPECT_EQ(out.str(), "(-2147483647 - 1)");
}

}  // namespace
}  // namespace tint::msl::writer