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

#include "src/tint/cmd/bench/bench.h"
#include "src/tint/lang/msl/writer/helpers/generate_bindings.h"
#include "src/tint/lang/msl/writer/writer.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/helpers/flatten_bindings.h"
#include "src/tint/lang/wgsl/reader/reader.h"
#include "src/tint/lang/wgsl/sem/variable.h"

namespace tint::msl::writer {
namespace {

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

    // Remap resource numbers to a flat namespace.
    const tint::Program* program = &res->program;
    auto flattened = tint::wgsl::FlattenBindings(res->program);
    if (flattened) {
        program = &*flattened;
    }

    tint::msl::writer::Options gen_options = {};
    gen_options.array_length_from_uniform.ubo_binding = 30;
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 0},
                                                                          0);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 1},
                                                                          1);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 2},
                                                                          2);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 3},
                                                                          3);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 4},
                                                                          4);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 5},
                                                                          5);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 6},
                                                                          6);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 7},
                                                                          7);
    gen_options.bindings = tint::msl::writer::GenerateBindings(*program);

    for (auto _ : state) {
        // Convert the AST program to an IR module.
        auto ir = tint::wgsl::reader::ProgramToLoweredIR(*program);
        if (ir != Success) {
            state.SkipWithError(ir.Failure().reason.Str());
            return;
        }

        auto gen_res = Generate(ir.Get(), gen_options);
        if (gen_res != Success) {
            state.SkipWithError(gen_res.Failure().reason.Str());
        }
    }
}

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

    // Remap resource numbers to a flat namespace.
    const tint::Program* program = &res->program;
    auto flattened = tint::wgsl::FlattenBindings(res->program);
    if (flattened) {
        program = &*flattened;
    }

    tint::msl::writer::Options gen_options = {};
    gen_options.array_length_from_uniform.ubo_binding = 30;
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 0},
                                                                          0);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 1},
                                                                          1);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 2},
                                                                          2);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 3},
                                                                          3);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 4},
                                                                          4);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 5},
                                                                          5);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 6},
                                                                          6);
    gen_options.array_length_from_uniform.bindpoint_to_size_index.emplace(tint::BindingPoint{0, 7},
                                                                          7);
    gen_options.bindings = tint::msl::writer::GenerateBindings(*program);

    for (auto _ : state) {
        auto gen_res = Generate(*program, gen_options);
        if (gen_res != Success) {
            state.SkipWithError(gen_res.Failure().reason.Str());
        }
    }
}

TINT_BENCHMARK_PROGRAMS(GenerateMSL);
TINT_BENCHMARK_PROGRAMS(GenerateMSL_AST);

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