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#include <utility>

#include "src/tint/lang/core/ir/transform/helper_test.h"
#include "src/tint/lang/core/type/struct.h"
#include "src/tint/lang/wgsl/builtin_fn.h"
#include "src/tint/lang/wgsl/ir/builtin_call.h"
#include "src/tint/lang/wgsl/reader/lower/lower.h"

namespace tint::wgsl::reader {
namespace {

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

using Wgslreader_LowerTest = core::ir::transform::TransformTest;

TEST_F(Wgslreader_LowerTest, BuiltinConversion) {
    auto* f = b.Function("f", ty.void_());
    b.Append(f->Block(), [&] {  //
        auto* result = b.InstructionResult(ty.i32());
        b.Append(b.ir.allocators.instructions.Create<wgsl::ir::BuiltinCall>(result,
                                                                            wgsl::BuiltinFn::kMax,
                                                                            Vector{
                                                                                b.Value(i32(1)),
                                                                                b.Value(i32(2)),
                                                                            }));
        b.Return(f);
    });

    auto* src = R"(
%f = func():void {
  $B1: {
    %2:i32 = wgsl.max 1i, 2i
    ret
  }
}
)";
    EXPECT_EQ(src, str());

    auto* expect = R"(
%f = func():void {
  $B1: {
    %2:i32 = max 1i, 2i
    ret
  }
}
)";

    Run(Lower);

    EXPECT_EQ(expect, str());
}

TEST_F(Wgslreader_LowerTest, WorkgroupUniformLoad) {
    auto* wgvar = b.Var("wgvar", ty.ptr<workgroup, i32>());
    mod.root_block->Append(wgvar);

    auto* f = b.Function("f", ty.i32());
    b.Append(f->Block(), [&] {  //
        auto* result = b.InstructionResult(ty.i32());
        b.Append(b.ir.allocators.instructions.Create<wgsl::ir::BuiltinCall>(
            result, wgsl::BuiltinFn::kWorkgroupUniformLoad, Vector{wgvar->Result(0)}));
        b.Return(f, result);
    });

    auto* src = R"(
$B1: {  # root
  %wgvar:ptr<workgroup, i32, read_write> = var
}

%f = func():i32 {
  $B2: {
    %3:i32 = wgsl.workgroupUniformLoad %wgvar
    ret %3
  }
}
)";
    EXPECT_EQ(src, str());

    auto* expect = R"(
$B1: {  # root
  %wgvar:ptr<workgroup, i32, read_write> = var
}

%f = func():i32 {
  $B2: {
    %3:void = workgroupBarrier
    %4:i32 = load %wgvar
    %5:void = workgroupBarrier
    ret %4
  }
}
)";

    Run(Lower);

    EXPECT_EQ(expect, str());
}

}  // namespace
}  // namespace tint::wgsl::reader