// Copyright 2024 The Dawn & Tint Authors
//
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// GEN_BUILD:CONDITION(tint_build_wgsl_reader)

#include <string>
#include <unordered_map>

#include "src/tint/cmd/fuzz/wgsl/fuzz.h"
#include "src/tint/lang/hlsl/validate/validate.h"
#include "src/tint/lang/hlsl/writer/writer.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/utils/command/command.h"

namespace tint::hlsl::writer {
namespace {

void ASTFuzzer(const tint::Program& program,
               const fuzz::wgsl::Options& fuzz_options,
               Options options) {
    if (program.AST().HasOverrides()) {
        return;
    }

    auto res = tint::hlsl::writer::Generate(program, options);
    if (res == Success) {
        const char* dxc_path = validate::kDxcDLLName;
        bool must_validate = false;
        if (!fuzz_options.dxc.empty()) {
            must_validate = true;
            dxc_path = fuzz_options.dxc.c_str();
        }

        auto dxc = tint::Command::LookPath(dxc_path);
        if (dxc.Found()) {
            uint32_t hlsl_shader_model = 60;
            bool require_16bit_types = false;
            auto enable_list = program.AST().Enables();
            for (auto* enable : enable_list) {
                if (enable->HasExtension(tint::wgsl::Extension::kF16)) {
                    hlsl_shader_model = 62;
                    require_16bit_types = true;
                    break;
                }
            }

            auto validate_res = validate::ValidateUsingDXC(dxc.Path(), res->hlsl, res->entry_points,
                                                           require_16bit_types, hlsl_shader_model);

            if (must_validate && validate_res.failed) {
                TINT_ICE() << "DXC was expected to succeed, but failed: " << validate_res.output;
            }

        } else if (must_validate) {
            TINT_ICE() << "DXC path was explicitly specified, but was not found: " << dxc_path;
        }
    }
}

}  // namespace
}  // namespace tint::hlsl::writer

TINT_WGSL_PROGRAM_FUZZER(tint::hlsl::writer::ASTFuzzer);