#include "restapiserver.h"

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>

#include <database/book_s.h>

#include "database/book_s-odb.hxx"

#include <odb/core.hxx>
#include <odb/database.hxx>
#include <odb/query.hxx>

RestApiServer::RestApiServer(odb::database& db, QObject* parent) :
    QTcpServer(parent), m_db(db) {}

void RestApiServer::start(quint16 port)
{
    if (!this->listen(QHostAddress::Any, port))
    {
        qWarning() << "Ошибка запуска сервера!";
    }
    else
    {
        qDebug() << "REST API сервер запущен на порту:" << port;
    }
}

void RestApiServer::incomingConnection(qintptr socketDescriptor)
{
    QTcpSocket* socket = new QTcpSocket(this);
    socket->setSocketDescriptor(socketDescriptor);

    connect(socket, &QTcpSocket::readyRead, this, &RestApiServer::handleRequest);
    connect(socket, &QTcpSocket::disconnected, socket, &QTcpSocket::deleteLater);
}

void RestApiServer::handleRequest()
{
    QTcpSocket* socket = qobject_cast<QTcpSocket*>(sender());
    if (!socket)
        return;

    QString request = QString::fromUtf8(socket->readAll());
    QByteArray response = processRequest(request);

    socket->write(response);
    socket->flush();
    socket->disconnectFromHost();
}

QByteArray RestApiServer::processRequest(const QString& request)
{
    if (request.startsWith("GET /books/author/"))
    {
        QString author = request.section(' ', 1, 1).section('/', 3, 3).replace("%20", " ");

        // Books books;
        // QList<BookRecord> results = books.getBooksByAuthor(author);

        QByteArray jsonResponse = "{ \"books\": [";
        // for (const BookRecord& book : results)
        // {
        //     jsonResponse += QString("{ \"id\": %1, \"title\": \"%2\", \"author\": \"%3\", \"year\": %4 },")
        //                     .arg(book.id)
        //                     .arg(book.title)
        //                     .arg(book.author)
        //                     .arg(book.year)
        //                     .toUtf8();
        // }
        // if (results.size() > 0)
        //     jsonResponse.chop(1); // Убираем последнюю запятую
        // jsonResponse += "] }";

        return "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n\r\n" + jsonResponse;
    }

    if (request.startsWith("GET /books"))
    {
        odb::transaction t(m_db.begin());
        odb::result<Book_S> res(m_db.query<Book_S>());

        QJsonArray jArray;

        for (auto it = res.begin(); it != res.end(); ++it)
        {
            const auto& book = *it;

            QJsonObject j;
            j["id"] = QString::number(book.id());
            j["title"] = QString::fromStdString(book.name());
            j["author"] = QString::fromStdString(book.author()->full_name());
            j["year"] = book.year();
            jArray.push_back(j);
        }
        auto jDoc = QJsonDocument(jArray);

        t.commit();

        return "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n\r\n" + jDoc.toJson(QJsonDocument::Indented);
    }

    if (request.startsWith("GET /author"))
    {
        odb::transaction t(m_db.begin());
        odb::result<Author_S> res(m_db.query<Author_S>());

        QJsonArray jArray;

        for (auto it = res.begin(); it != res.end(); ++it)
        {
            const auto& author = *it;

            QJsonObject j;
            j["id"] = QString::number(author.id());
            j["first"] = QString::fromStdString(author.first());
            j["last"] = QString::fromStdString(author.last());
            j["age"] = author.age();
            jArray.push_back(j);
        }
        auto jDoc = QJsonDocument(jArray);

        t.commit();
        return "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n\r\n" + jDoc.toJson(QJsonDocument::Indented);
    }

    return "HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\n\r\nNot Found";
}