// Copyright (c) Advanced Micro Devices, Inc., or its affiliates.
// SPDX-License-Identifier: MIT

#include <gtest/gtest.h>

#include "ck_tile/dispatcher.hpp"

using namespace ck_tile::dispatcher;

namespace {

class StubFmhaKernel : public FmhaKernelInstance
{
    public:
    StubFmhaKernel(FmhaKernelKey key, std::string name)
        : key_(std::move(key)), name_(std::move(name))
    {
    }

    const FmhaKernelKey& get_key() const override { return key_; }
    bool supports(const FmhaProblem& problem) const override
    {
        return key_.signature.family == problem.requested_family &&
               key_.signature.data_type == problem.data_type;
    }
    std::string get_name() const override { return name_; }
    void launch(const FmhaInvocation&, const ck_tile::stream_config&) const override {}

    private:
    FmhaKernelKey key_;
    std::string name_;
};

FmhaKernelKey
make_stub_key(FmhaKernelFamily family, const std::string& dtype, const std::string& arch)
{
    FmhaKernelKey key;
    key.signature.family     = family;
    key.signature.data_type  = dtype;
    key.signature.hdim_q     = 128;
    key.signature.hdim_v     = 128;
    key.gfx_arch             = arch;
    key.algorithm.tile_shape = {128, 128, 32, 128, 32, 128};
    key.algorithm.pad_s      = true;
    key.algorithm.pad_sk     = true;
    key.algorithm.pad_d      = true;
    key.algorithm.pad_dv     = true;
    return key;
}

} // namespace

TEST(FmhaRegistryTest, RegisterAndLookup)
{
    FmhaRegistry reg;
    auto key    = make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950");
    auto kernel = std::make_shared<StubFmhaKernel>(key, "test_fwd_fp16");
    EXPECT_TRUE(reg.register_kernel(kernel));
    EXPECT_EQ(reg.size(), 1u);
    auto found = reg.lookup(key);
    ASSERT_NE(found, nullptr);
    EXPECT_EQ(found->get_name(), "test_fwd_fp16");
}

TEST(FmhaRegistryTest, GetAllReturnsSorted)
{
    FmhaRegistry reg;
    auto key_a                     = make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950");
    key_a.algorithm.selection_rank = 1;
    auto key_b                     = make_stub_key(FmhaKernelFamily::BwdDqDkDv, "fp16", "gfx950");
    key_b.algorithm.selection_rank = 0;

    reg.register_kernel(std::make_shared<StubFmhaKernel>(key_a, "rank1"));
    reg.register_kernel(std::make_shared<StubFmhaKernel>(key_b, "rank0"));

    auto all = reg.get_all();
    ASSERT_EQ(all.size(), 2u);
    EXPECT_EQ(all[0]->get_name(), "rank0");
    EXPECT_EQ(all[1]->get_name(), "rank1");
}

TEST(FmhaRegistryTest, FilterByArch)
{
    FmhaRegistry reg;
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950"), "k950"));
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx942"), "k942"));
    EXPECT_EQ(reg.size(), 2u);

    auto removed = reg.filter_by_arch("gfx950");
    EXPECT_EQ(removed, 1u);
    EXPECT_EQ(reg.size(), 1u);
    EXPECT_NE(reg.lookup(make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950")), nullptr);
}

TEST(FmhaRegistryTest, FilterByPredicate)
{
    FmhaRegistry reg;
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950"), "fwd_fp16"));
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::Fwd, "bf16", "gfx950"), "fwd_bf16"));
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::BwdDqDkDv, "fp16", "gfx950"), "bwd_fp16"));

    auto fwd_only = reg.filter([](const FmhaKernelInstance& k) {
        return k.get_key().signature.family == FmhaKernelFamily::Fwd;
    });
    EXPECT_EQ(fwd_only.size(), 2u);
}

TEST(FmhaRegistryTest, ExportJsonContainsMetadata)
{
    FmhaRegistry reg;
    reg.set_name("test_registry");
    reg.register_kernel(std::make_shared<StubFmhaKernel>(
        make_stub_key(FmhaKernelFamily::Fwd, "fp16", "gfx950"), "fwd_fp16"));

    auto json = reg.export_json();
    EXPECT_NE(json.find("test_registry"), std::string::npos);
    EXPECT_NE(json.find("total_kernels"), std::string::npos);
    EXPECT_NE(json.find("fwd_fp16"), std::string::npos);
}