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#include "src/tint/cmd/fuzz/ir/fuzz.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/var.h"
#include "src/tint/lang/core/type/input_attachment.h"
#include "src/tint/lang/core/type/pointer.h"
#include "src/tint/lang/msl/writer/helpers/generate_bindings.h"
#include "src/tint/lang/msl/writer/writer.h"

namespace tint::msl::writer {
namespace {

bool CanRun(const core::ir::Module& module) {
    // Check for push constants and input attachments, which the MSL writer does not support.
    for (auto* inst : *module.root_block) {
        auto* var = inst->As<core::ir::Var>();
        auto* ptr = var->Result(0)->Type()->As<core::type::Pointer>();
        if (ptr->AddressSpace() == core::AddressSpace::kPushConstant) {
            return false;
        }
        if (ptr->StoreType()->Is<core::type::InputAttachment>()) {
            return false;
        }
    }
    return true;
}

void IRFuzzer(core::ir::Module& module, Options options) {
    if (!CanRun(module)) {
        return;
    }

    options.bindings = GenerateBindings(module);
    options.array_length_from_uniform.ubo_binding = 30;

    // Add array_length_from_uniform entries for all storage buffers with runtime sized arrays.
    std::unordered_set<tint::BindingPoint> storage_bindings;
    for (auto* inst : *module.root_block) {
        auto* var = inst->As<core::ir::Var>();
        if (!var->Result(0)->Type()->UnwrapPtr()->HasFixedFootprint()) {
            if (auto bp = var->BindingPoint()) {
                if (storage_bindings.insert(bp.value()).second) {
                    options.array_length_from_uniform.bindpoint_to_size_index.emplace(
                        bp.value(), static_cast<uint32_t>(storage_bindings.size() - 1));
                }
            }
        }
    }

    [[maybe_unused]] auto output = Generate(module, options);
}

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

TINT_IR_MODULE_FUZZER(tint::msl::writer::IRFuzzer);