// Copyright 2022 The Dawn & Tint Authors
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#include <string>

#include "src/tint/cmd/bench/bench.h"
#include "src/tint/lang/core/ir/transform/single_entry_point.h"
#include "src/tint/lang/glsl/writer/helpers/generate_bindings.h"
#include "src/tint/lang/glsl/writer/writer.h"
#include "src/tint/lang/wgsl/ast/identifier.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/ast/transform/manager.h"
#include "src/tint/lang/wgsl/inspector/inspector.h"
#include "src/tint/lang/wgsl/reader/reader.h"

namespace tint::glsl::writer {
namespace {

void GenerateGLSL(benchmark::State& state, std::string input_name) {
    auto res = bench::GetWgslProgram(input_name);
    if (res != Success) {
        state.SkipWithError(res.Failure().reason.Str());
        return;
    }

    std::vector<std::string> names;
    tint::glsl::writer::Options gen_options = {};
    {
        // Convert the AST program to an IR module, so that we can generating bindings data.
        auto ir = tint::wgsl::reader::ProgramToLoweredIR(res->program);
        if (ir != Success) {
            state.SkipWithError(ir.Failure().reason.Str());
            return;
        }
        gen_options.bindings = tint::glsl::writer::GenerateBindings(ir.Get());

        // Get the list of entry point names.
        for (auto func : ir->functions) {
            if (func->Stage() != core::ir::Function::PipelineStage::kUndefined) {
                names.push_back(ir->NameOf(func).Name());
            }
        }
    }

    for (auto _ : state) {
        for (uint32_t i = 0; i < names.size(); i++) {
            // Convert the AST program to an IR module.
            auto ir = tint::wgsl::reader::ProgramToLoweredIR(res->program);
            if (ir != Success) {
                state.SkipWithError(ir.Failure().reason.Str());
                return;
            }

            // Run single entry point to strip the program down to a single entry point.
            auto single_result = core::ir::transform::SingleEntryPoint(ir.Get(), names[i]);
            if (single_result != Success) {
                state.SkipWithError(ir.Failure().reason.Str());
                return;
            }

            // Generate GLSL.
            auto gen_res = Generate(ir.Get(), gen_options, names[i]);
            if (gen_res != Success) {
                state.SkipWithError(gen_res.Failure().reason.Str());
            }
        }
    }
}

TINT_BENCHMARK_PROGRAMS(GenerateGLSL);

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