#include "net/ModelServerClient.h"

#include <QEventLoop>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QTimer>
#include <QUrl>

namespace core {

ModelServerClient::ModelServerClient(QObject* parent)
    : QObject(parent)
    , m_nam(new QNetworkAccessManager(this)) {
}

void ModelServerClient::setBaseUrl(const QUrl& baseUrl) {
    m_baseUrl = baseUrl;
}

QUrl ModelServerClient::baseUrl() const {
    return m_baseUrl;
}

QNetworkReply* ModelServerClient::computeDepthPng8Async(const QByteArray& imageBytes, QString* outImmediateError) {
    if (outImmediateError) {
        outImmediateError->clear();
    }
    if (!m_baseUrl.isValid() || m_baseUrl.isEmpty()) {
        if (outImmediateError) *outImmediateError = QStringLiteral("后端地址无效。");
        return nullptr;
    }
    if (imageBytes.isEmpty()) {
        if (outImmediateError) *outImmediateError = QStringLiteral("输入图像为空。");
        return nullptr;
    }

    const QUrl url = m_baseUrl.resolved(QUrl(QStringLiteral("/depth")));
    QNetworkRequest req(url);
    req.setHeader(QNetworkRequest::ContentTypeHeader, QStringLiteral("application/json"));

    const QByteArray imageB64 = imageBytes.toBase64();
    const QJsonObject payload{
        {QStringLiteral("image_b64"), QString::fromLatin1(imageB64)},
    };
    const QByteArray body = QJsonDocument(payload).toJson(QJsonDocument::Compact);
    return m_nam->post(req, body);
}

QNetworkReply* ModelServerClient::segmentSamPromptAsync(
    const QByteArray& cropRgbPngBytes,
    const QByteArray& overlayPngBytes,
    const QJsonArray& pointCoords,
    const QJsonArray& pointLabels,
    const QJsonArray& boxXyxy,
    QString* outImmediateError
) {
    if (outImmediateError) {
        outImmediateError->clear();
    }
    if (!m_baseUrl.isValid() || m_baseUrl.isEmpty()) {
        if (outImmediateError) *outImmediateError = QStringLiteral("后端地址无效。");
        return nullptr;
    }
    if (cropRgbPngBytes.isEmpty()) {
        if (outImmediateError) *outImmediateError = QStringLiteral("裁剪图像为空。");
        return nullptr;
    }

    const QUrl url = m_baseUrl.resolved(QUrl(QStringLiteral("/segment/sam_prompt")));
    QNetworkRequest req(url);
    req.setHeader(QNetworkRequest::ContentTypeHeader, QStringLiteral("application/json"));

    QJsonObject payload;
    payload.insert(QStringLiteral("image_b64"), QString::fromLatin1(cropRgbPngBytes.toBase64()));
    if (!overlayPngBytes.isEmpty()) {
        payload.insert(QStringLiteral("overlay_b64"), QString::fromLatin1(overlayPngBytes.toBase64()));
    }
    payload.insert(QStringLiteral("point_coords"), pointCoords);
    payload.insert(QStringLiteral("point_labels"), pointLabels);
    payload.insert(QStringLiteral("box_xyxy"), boxXyxy);

    const QByteArray body = QJsonDocument(payload).toJson(QJsonDocument::Compact);
    return m_nam->post(req, body);
}

bool ModelServerClient::computeDepthPng8(
    const QByteArray& imageBytes,
    QByteArray& outPngBytes,
    QString& outError,
    int timeoutMs
) {
    outPngBytes.clear();
    outError.clear();

    if (!m_baseUrl.isValid() || m_baseUrl.isEmpty()) {
        outError = QStringLiteral("后端地址无效。");
        return false;
    }
    if (imageBytes.isEmpty()) {
        outError = QStringLiteral("输入图像为空。");
        return false;
    }

    const QUrl url = m_baseUrl.resolved(QUrl(QStringLiteral("/depth")));

    QNetworkRequest req(url);
    req.setHeader(QNetworkRequest::ContentTypeHeader, QStringLiteral("application/json"));

    const QByteArray imageB64 = imageBytes.toBase64();
    const QJsonObject payload{
        {QStringLiteral("image_b64"), QString::fromLatin1(imageB64)},
    };
    const QByteArray body = QJsonDocument(payload).toJson(QJsonDocument::Compact);

    QNetworkReply* reply = m_nam->post(req, body);
    if (!reply) {
        outError = QStringLiteral("创建网络请求失败。");
        return false;
    }

    QEventLoop loop;
    QTimer timer;
    timer.setSingleShot(true);
    const int t = (timeoutMs <= 0) ? 30000 : timeoutMs;

    QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    QObject::connect(&timer, &QTimer::timeout, &loop, &QEventLoop::quit);
    timer.start(t);
    loop.exec();

    if (timer.isActive() == false && reply->isFinished() == false) {
        reply->abort();
        reply->deleteLater();
        outError = QStringLiteral("请求超时（%1ms）。").arg(t);
        return false;
    }

    const int httpStatus = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
    const QByteArray raw = reply->readAll();
    const auto netErr = reply->error();
    const QString netErrStr = reply->errorString();
    reply->deleteLater();

    if (netErr != QNetworkReply::NoError) {
        outError = QStringLiteral("网络错误：%1").arg(netErrStr);
        return false;
    }

    if (httpStatus != 200) {
        // FastAPI HTTPException 默认返回 {"detail": "..."}
        QString detail;
        const QJsonDocument jd = QJsonDocument::fromJson(raw);
        if (jd.isObject()) {
            const auto obj = jd.object();
            detail = obj.value(QStringLiteral("detail")).toString();
        }
        outError = detail.isEmpty()
                       ? QStringLiteral("后端返回HTTP %1。").arg(httpStatus)
                       : QStringLiteral("后端错误（HTTP %1）：%2").arg(httpStatus).arg(detail);
        return false;
    }

    if (raw.isEmpty()) {
        outError = QStringLiteral("后端返回空数据。");
        return false;
    }

    outPngBytes = raw;
    return true;
}

}  // namespace core