/tokenspeed-scheduler/tests/cpp/test_basic_lifecycle.cpp

// Copyright (c) 2026 LightSeek Foundation
//
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// furnished to do so, subject to the following conditions:
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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#include "integration_test_helper.h"

namespace tokenspeed::test {

class BasicLifecycleTestSuite : public SchedulerTestSuite {
protected:
    SchedulerConfig MakeConfig() override {
        auto cfg = SchedulerTestSuite::MakeConfig();
        cfg.enable_l3_storage = false;
        return cfg;
    }

    static const FlatForwardOperation* GetForwardOp(const ExecutionPlan& plan) {
        for (const auto& op : plan.Operations()) {
            if (auto* f = std::get_if<FlatForwardOperation>(&op)) return f;
        }
        return nullptr;
    }
};

TEST_F(BasicLifecycleTestSuite, Submit_CreatesWaitingRequest) {
    Submit(MakeRequestSpec("r1", 2));
    EXPECT_EQ(scheduler_->WaitingSize(), 1u);
    EXPECT_EQ(scheduler_->DecodingSize(), 0u);
}

TEST_F(BasicLifecycleTestSuite, PlanOnce_SchedulesPrefill) {
    Submit(MakeRequestSpec("r1", 2));
    auto plan = PlanOnce();
    auto* fwd = GetForwardOp(plan);
    ASSERT_NE(fwd, nullptr);
    ASSERT_FALSE(fwd->request_ids.empty());
    EXPECT_EQ(fwd->request_ids[0], "r1");
    EXPECT_GT(fwd->input_lengths[0], 0);
}

TEST_F(BasicLifecycleTestSuite, ForwardDone_TransitionsToPrefillDone) {
    Submit(MakeRequestSpec("r1", 2));
    PlanOnce();
    SendForwardDone("r1", {42});
    EXPECT_EQ(scheduler_->PrefillSize(), 1u);
}

TEST_F(BasicLifecycleTestSuite, SecondPlan_TransitionsToDecoding) {
    Submit(MakeRequestSpec("r1", 2));
    PlanOnce();
    SendForwardDone("r1", {42});
    PlanOnce();
    EXPECT_EQ(scheduler_->DecodingSize(), 1u);
}

TEST_F(BasicLifecycleTestSuite, FullLifecycle_SubmitThroughFinish) {
    Submit(MakeRequestSpec("r1", 2));
    PlanOnce();
    SendForwardDone("r1", {42});
    PlanOnce();
    EXPECT_EQ(scheduler_->DecodingSize(), 1u);

    SendFinish("r1");
    auto plan = PlanOnce();
    PlanOnce();
    EXPECT_EQ(scheduler_->DecodingSize(), 0u);
}

TEST_F(BasicLifecycleTestSuite, EmptyPlan_NoRequests) {
    auto plan = PlanOnce();
    auto* fwd = GetForwardOp(plan);
    ASSERT_NE(fwd, nullptr);
    EXPECT_TRUE(fwd->request_ids.empty());
}

TEST_F(BasicLifecycleTestSuite, MultipleSubmits_AllGetScheduled) {
    Submit(MakeRequestSpec("r1", 2, 1));
    Submit(MakeRequestSpec("r2", 2, 50));
    auto plan = PlanOnce();
    auto* fwd = GetForwardOp(plan);
    ASSERT_NE(fwd, nullptr);
    EXPECT_EQ(fwd->request_ids.size(), 2u);
}

TEST_F(BasicLifecycleTestSuite, TokenSizeGrowsWithDecodeOutput) {
    Submit(MakeRequestSpec("r1", 2));
    PlanOnce();
    SendForwardDone("r1", {42});
    PlanOnce();
    EXPECT_EQ(scheduler_->GetRequestTokenSize("r1"), 5);

    SendForwardDone("r1", {43});
    EXPECT_EQ(scheduler_->GetRequestTokenSize("r1"), 6);
}

TEST_F(BasicLifecycleTestSuite, GetRequestTokenSize_UnknownRequest) {
    EXPECT_EQ(scheduler_->GetRequestTokenSize("nonexistent"), -1);
}

TEST_F(BasicLifecycleTestSuite, AvailableKvPages_DecreasesAfterPrefill) {
    auto before = scheduler_->AvailableKvPages();
    Submit(MakeRequestSpec("r1", 2));
    PlanOnce();
    auto after = scheduler_->AvailableKvPages();
    EXPECT_LT(after, before);
}

}  // namespace tokenspeed::test