/**
 * Synor Compute SDK - Client Implementation
 */

#include "synor/compute.hpp"
#include <curl/curl.h>
#include <nlohmann/json.hpp>
#include <stdexcept>

namespace synor {

using json = nlohmann::json;

// ============ Client Implementation ============

struct SynorCompute::Impl {
    Config config;
    CURL* curl = nullptr;
    bool closed = false;

    Impl(Config cfg) : config(std::move(cfg)) {
        curl_global_init(CURL_GLOBAL_DEFAULT);
        curl = curl_easy_init();
    }

    ~Impl() {
        close();
    }

    void close() {
        if (!closed) {
            closed = true;
            if (curl) {
                curl_easy_cleanup(curl);
                curl = nullptr;
            }
            curl_global_cleanup();
        }
    }
};

SynorCompute::SynorCompute(const std::string& api_key)
    : SynorCompute(Config{.api_key = api_key}) {}

SynorCompute::SynorCompute(Config config)
    : impl_(std::make_unique<Impl>(std::move(config))) {}

SynorCompute::~SynorCompute() = default;

SynorCompute::SynorCompute(SynorCompute&&) noexcept = default;
SynorCompute& SynorCompute::operator=(SynorCompute&&) noexcept = default;

void SynorCompute::close() {
    impl_->close();
}

// ============ Matrix Operations ============

Result<JobResult<Tensor>> SynorCompute::matmul(
    const Tensor& a,
    const Tensor& b,
    const MatMulOptions& options
) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    // TODO: Implement HTTP request
    JobResult<Tensor> result;
    result.status = JobStatus::Completed;
    result.job_id = "job-placeholder";

    return result;
}

Result<JobResult<Tensor>> SynorCompute::conv2d(
    const Tensor& input,
    const Tensor& kernel,
    const Conv2dOptions& options
) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    JobResult<Tensor> result;
    result.status = JobStatus::Completed;
    result.job_id = "job-placeholder";

    return result;
}

Result<JobResult<Tensor>> SynorCompute::attention(
    const Tensor& query,
    const Tensor& key,
    const Tensor& value,
    const AttentionOptions& options
) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    JobResult<Tensor> result;
    result.status = JobStatus::Completed;
    result.job_id = "job-placeholder";

    return result;
}

// ============ LLM Inference ============

Result<JobResult<std::string>> SynorCompute::inference(
    const std::string& model,
    const std::string& prompt,
    const InferenceOptions& options
) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    JobResult<std::string> result;
    result.status = JobStatus::Completed;
    result.job_id = "job-placeholder";

    return result;
}

Result<void> SynorCompute::inference_stream(
    const std::string& model,
    const std::string& prompt,
    std::function<void(const std::string&)> on_token,
    const InferenceOptions& options
) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    // TODO: Implement streaming HTTP request
    return {};
}

// ============ Model Registry ============

Result<std::vector<ModelInfo>> SynorCompute::list_models(std::optional<ModelCategory> category) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    return std::vector<ModelInfo>{};
}

Result<ModelInfo> SynorCompute::get_model(const std::string& model_id) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    return ModelInfo{.id = model_id, .name = model_id, .category = ModelCategory::LLM};
}

Result<std::vector<ModelInfo>> SynorCompute::search_models(const std::string& query) {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    return std::vector<ModelInfo>{};
}

// ============ Pricing & Usage ============

Result<std::vector<PricingInfo>> SynorCompute::get_pricing() {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    return std::vector<PricingInfo>{};
}

Result<UsageStats> SynorCompute::get_usage() {
    if (impl_->closed) {
        return std::unexpected(Error{ErrorCode::ClientClosed, "Client has been closed"});
    }

    return UsageStats{};
}

// ============ Health Check ============

bool SynorCompute::health_check() {
    if (impl_->closed) return false;
    // TODO: Implement health check request
    return true;
}

} // namespace synor
