#pragma once

#include "engine/framework/assets/tensor_source.h"
#include "engine/framework/runtime/session_base.h"
#include "engine/models/qwen3_asr/assets.h"
#include "engine/models/qwen3_asr/audio_encoder.h"
#include "engine/models/qwen3_asr/frontend_whisper.h"
#include "engine/models/qwen3_asr/postprocess.h"
#include "engine/models/qwen3_asr/prompt_asr.h"
#include "engine/models/qwen3_asr/thinker.h"
#include "engine/models/qwen3_asr/tokenizer_text.h"

#include <chrono>
#include <cstddef>
#include <filesystem>
#include <memory>
#include <optional>
#include <string>
#include <vector>

namespace engine::models::qwen3_forced_aligner {
class Qwen3ForcedAlignerSession;
}

namespace engine::runtime {
class ILoadedVoiceModel;
}

namespace engine::models::qwen3_asr {

class Qwen3ASRSession final
    : public runtime::RuntimeSessionBase
    , public runtime::IOfflineVoiceTaskSession
    , public runtime::IStreamingVoiceTaskSession {
public:
    Qwen3ASRSession(
        runtime::TaskSpec task,
        runtime::SessionOptions options,
        std::shared_ptr<const Qwen3ASRAssets> assets);
    ~Qwen3ASRSession() override;

    std::string family() const override;
    runtime::VoiceTaskKind task_kind() const override;
    runtime::RunMode run_mode() const override;
    void prepare(const runtime::SessionPreparationRequest & request) override;
    runtime::TaskResult run(const runtime::TaskRequest & request) override;
    runtime::StreamingPolicy streaming_policy() const override;
    void start_stream(const runtime::TaskRequest & request) override;
    void set_stream_event_sink(runtime::StreamEventCallback sink) override;
    void reset() override;
    runtime::StreamEvent process_audio_chunk(const runtime::AudioChunk & chunk) override;
    runtime::TaskResult finish_stream() override;
    runtime::TaskResult finalize() override;

private:
    struct AudioChunkPlan {
        runtime::TimeSpan source_span;
        runtime::TimeSpan keep_span;
    };

    Qwen3ASRRequest make_request(const runtime::TaskRequest & request) const;
    std::vector<AudioChunkPlan> audio_chunk_plan(const runtime::TaskRequest & request);
    runtime::IOfflineVoiceTaskSession & vad_session();
    runtime::TaskResult run_single(const Qwen3ASRRequest & request);
    runtime::StreamEvent process_available_stream_chunks(bool final);
    runtime::StreamEvent process_one_stream_chunk(const runtime::AudioBuffer & audio);

    runtime::TaskSpec task_;
    std::shared_ptr<const Qwen3ASRAssets> assets_;
    size_t audio_encoder_graph_arena_bytes_ = 128ull * 1024ull * 1024ull;
    size_t thinker_prefill_graph_arena_bytes_ = 256ull * 1024ull * 1024ull;
    size_t thinker_decode_graph_arena_bytes_ = 256ull * 1024ull * 1024ull;
    size_t thinker_weight_context_bytes_ = 64ull * 1024ull * 1024ull;
    engine::assets::TensorStorageType audio_encoder_weight_storage_type_ = engine::assets::TensorStorageType::Native;
    engine::assets::TensorStorageType thinker_weight_storage_type_ = engine::assets::TensorStorageType::Native;
    Qwen3ASRTextTokenizer tokenizer_;
    Qwen3ASRWhisperFrontend frontend_;
    Qwen3ASRAudioEncoderRuntime audio_encoder_;
    Qwen3ASRThinkerRuntime thinker_;
    Qwen3ASRPromptBuilder prompt_builder_;
    Qwen3ASRPostprocessor postprocessor_;
    std::unique_ptr<engine::models::qwen3_forced_aligner::Qwen3ForcedAlignerSession> forced_aligner_session_;
    std::filesystem::path vad_model_path_;
    std::unique_ptr<runtime::ILoadedVoiceModel> vad_model_;
    std::unique_ptr<runtime::IOfflineVoiceTaskSession> vad_session_;
    runtime::TaskRequest streaming_request_;
    runtime::TaskResult streaming_result_;
    runtime::AudioBuffer streaming_audio_;
    size_t streaming_audio_offset_values_ = 0;
    std::string streaming_text_;
    size_t streaming_published_bytes_ = 0;
    int64_t streaming_windows_processed_ = 0;
    runtime::StreamEventCallback stream_event_sink_;
    bool stream_started_ = false;
    std::chrono::steady_clock::time_point stream_wall_start_{};
};

}  // namespace engine::models::qwen3_asr