#include "rpcservicewidget.h"

#include "robotclient.h"
#include "ui_rpcservicewidget.h"

#include <QComboBox>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QTextEdit>

#ifdef CMVR_WITH_GRPC
#include <google/protobuf/descriptor.h>
#endif

namespace {
#ifdef CMVR_WITH_GRPC
QJsonValue defaultFieldValue(const google::protobuf::FieldDescriptor *field, int depth);

QJsonObject messageTemplate(const google::protobuf::Descriptor *descriptor, int depth)
{
    QJsonObject object;
    if (!descriptor || depth > 5)
        return object;

    for (int index = 0; index < descriptor->field_count(); ++index) {
        const google::protobuf::FieldDescriptor *field = descriptor->field(index);
        if (field->containing_oneof() &&
            field->containing_oneof()->field(0) != field) {
            continue;
        }
        if (field->name() == "timestamp")
            continue;
        object.insert(QString::fromStdString(field->json_name()),
                      field->is_repeated() ? QJsonValue(QJsonArray())
                                           : defaultFieldValue(field, depth + 1));
    }
    return object;
}

QJsonValue defaultFieldValue(const google::protobuf::FieldDescriptor *field, int depth)
{
    using Field = google::protobuf::FieldDescriptor;
    switch (field->cpp_type()) {
    case Field::CPPTYPE_BOOL:
        return false;
    case Field::CPPTYPE_INT32:
    case Field::CPPTYPE_UINT32:
    case Field::CPPTYPE_FLOAT:
    case Field::CPPTYPE_DOUBLE:
        return 0;
    case Field::CPPTYPE_INT64:
    case Field::CPPTYPE_UINT64:
        return QStringLiteral("0");
    case Field::CPPTYPE_ENUM:
        return QString::fromStdString(field->enum_type()->value(0)->name());
    case Field::CPPTYPE_MESSAGE:
        return messageTemplate(field->message_type(), depth);
    case Field::CPPTYPE_STRING:
    default:
        return QString();
    }
}
#endif
}

RpcServiceWidget::RpcServiceWidget(const QString &serviceName, RobotClient *client,
                                   QWidget *parent)
    : QWidget(parent), m_ui(new Ui::RpcServiceWidget), m_client(client),
      m_serviceName(serviceName)
{
    m_ui->setupUi(this);
    const QString shortName = serviceName.section(QLatin1Char('.'), -1);
    m_ui->serviceNameLabel->setText(shortName);
    m_ui->servicePathLabel->setText(serviceName);
    m_ui->requestEdit->setFontFamily(QStringLiteral("Consolas"));
    m_ui->responseEdit->setFontFamily(QStringLiteral("Consolas"));

#ifdef CMVR_WITH_GRPC
    const google::protobuf::ServiceDescriptor *service =
        google::protobuf::DescriptorPool::generated_pool()->FindServiceByName(
            serviceName.toStdString());
    if (service) {
        for (int index = 0; index < service->method_count(); ++index) {
            const google::protobuf::MethodDescriptor *method = service->method(index);
            QString kind = QStringLiteral("Unary");
            if (method->client_streaming() && method->server_streaming())
                kind = QStringLiteral("Bidi stream");
            else if (method->client_streaming())
                kind = QStringLiteral("Client stream");
            else if (method->server_streaming())
                kind = QStringLiteral("Server stream");
            m_ui->methodCombo->addItem(
                QStringLiteral("%1  [%2]").arg(QString::fromStdString(method->name()), kind),
                QString::fromStdString(method->name()));
        }
    }
#endif

    if (m_ui->methodCombo->count() == 0) {
        m_ui->methodCombo->addItem(QStringLiteral("没有可用的 protobuf 描述符"));
    }
    m_ui->executeButton->setEnabled(false);

    connect(m_ui->methodCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
            this, &RpcServiceWidget::updateMethod);
    connect(m_ui->resetButton, &QPushButton::clicked,
            this, &RpcServiceWidget::resetRequest);
    connect(m_ui->executeButton, &QPushButton::clicked,
            this, &RpcServiceWidget::executeRequest);
    connect(m_client, &RobotClient::rpcFinished,
            this, &RpcServiceWidget::handleResult);
    connect(m_client, &RobotClient::connectionChanged, this,
            [this](bool connected, int, const QString &) {
        m_ui->executeButton->setEnabled(connected && m_ui->methodCombo->count() > 0);
    });
    updateMethod();
}

RpcServiceWidget::~RpcServiceWidget()
{
    delete m_ui;
}

QString RpcServiceWidget::requestTemplate(const QString &methodName) const
{
#ifdef CMVR_WITH_GRPC
    const google::protobuf::ServiceDescriptor *service =
        google::protobuf::DescriptorPool::generated_pool()->FindServiceByName(
            m_serviceName.toStdString());
    const google::protobuf::MethodDescriptor *method =
        service ? service->FindMethodByName(methodName.toStdString()) : nullptr;
    if (method) {
        const QJsonObject object = messageTemplate(method->input_type(), 0);
        return QString::fromUtf8(QJsonDocument(object).toJson(QJsonDocument::Indented));
    }
#else
    Q_UNUSED(methodName)
#endif
    return QStringLiteral("{}");
}

void RpcServiceWidget::updateMethod()
{
    const QString methodName = m_ui->methodCombo->currentData().toString();
    if (methodName.isEmpty())
        return;

#ifdef CMVR_WITH_GRPC
    const google::protobuf::ServiceDescriptor *service =
        google::protobuf::DescriptorPool::generated_pool()->FindServiceByName(
            m_serviceName.toStdString());
    const google::protobuf::MethodDescriptor *method =
        service ? service->FindMethodByName(methodName.toStdString()) : nullptr;
    if (method) {
        QString mode = QStringLiteral("Unary RPC");
        if (method->client_streaming() && method->server_streaming())
            mode = QStringLiteral("双向流：请求可填写 JSON 数组，最多接收 100 条反馈");
        else if (method->client_streaming())
            mode = QStringLiteral("客户端流：请求填写 JSON 数组");
        else if (method->server_streaming())
            mode = QStringLiteral("服务端流：执行后接收最多 5 秒或 100 条反馈");
        m_ui->methodDetailLabel->setText(
            QStringLiteral("%1 -> %2    %3")
                .arg(QString::fromStdString(method->input_type()->full_name()),
                     QString::fromStdString(method->output_type()->full_name()), mode));
        m_ui->executeButton->setText(method->client_streaming() || method->server_streaming()
                                         ? QStringLiteral("执行流式 RPC")
                                         : QStringLiteral("执行 RPC"));
    }
#endif
    resetRequest();
}

void RpcServiceWidget::resetRequest()
{
    const QString methodName = m_ui->methodCombo->currentData().toString();
    m_ui->requestEdit->setPlainText(requestTemplate(methodName));
    m_ui->responseEdit->clear();
    m_ui->resultLabel->setText(QStringLiteral("等待执行"));
}

void RpcServiceWidget::executeRequest()
{
    const QString methodName = m_ui->methodCombo->currentData().toString();
    if (methodName.isEmpty())
        return;
    m_pendingMethod = methodName;
    m_ui->executeButton->setEnabled(false);
    m_ui->resultLabel->setText(QStringLiteral("正在调用..."));
    m_ui->responseEdit->clear();
    m_client->requestRpc(m_serviceName, methodName,
                         m_ui->requestEdit->toPlainText(),
                         m_ui->deviceIdEdit->text().trimmed());
}

void RpcServiceWidget::handleResult(const QString &serviceName, const QString &methodName,
                                    bool success, const QString &responseJson)
{
    if (serviceName != m_serviceName || methodName != m_pendingMethod)
        return;
    m_pendingMethod.clear();
    m_ui->executeButton->setEnabled(true);
    m_ui->resultLabel->setText(success ? QStringLiteral("调用成功")
                                       : QStringLiteral("调用失败"));
    m_ui->responseEdit->setPlainText(responseJson);
}