#ifndef AUTOFORM_H
#define AUTOFORM_H

#include <QWidget>
#include <QList>
#include <QLineEdit>
#include <QSharedPointer>
#include <QMetaMethod>
#include <QDebug>
#include <QVariant>
#include <QMessageBox>
#include <QComboBox>

#include "iform.h"
#include "service.h"
#include "ivalidator.h"
#include "iservice.h"
#include "iplugin.h"

#include "combodata.h"

template <class T>
class AutoForm : public IForm
{
public:
    explicit AutoForm(QWidget *parent = 0) : IForm(parent) {
        m_newRec = false;
        m_serviceConnected = false;
        m_saved = false;
    }

    virtual ~AutoForm() {
        foreach (IValidator *val, m_validators) {
            delete val;
        }
        m_validators.clear();
    }

    void setEntity(QSharedPointer<T> entity) {
        m_entity = entity;
        bindToUi();
    }

    QSharedPointer<T> entity() {
        return m_entity;
    }

    void setNewRec(bool isNew) {
        m_newRec = isNew;
    }

    void registerBinding(QWidget *widget) {
        if (!m_bindWidgets.contains(widget)) {
            m_bindWidgets.append(widget);
        }
    }

    void registerBinding(QComboBox *combo, const QList<ComboData> &values) {
        m_bindCombos[combo] = values;
    }

    void registerValidator(IValidator *validator) {
        m_validators.append(validator);
    }

protected:
    virtual void bindOtherToUi() {}
    virtual bool bindOtherToData() { return true; }
    virtual void registerCombos() {}

private:
    QSharedPointer<T> m_entity;
    QList<QWidget*> m_bindWidgets;
    QList<IValidator*> m_validators;
    QHash<QComboBox*, QList<ComboData> > m_bindCombos;
    bool m_newRec;

    void bindToUi() {
        registerCombos();
        foreach (QWidget *widget, m_bindWidgets) {
            const char* prop = widget->metaObject()->userProperty().name();
            widget->setProperty(prop, ((QObject*)m_entity.data())->property(widget->objectName().toStdString().c_str()));
        }

        foreach (QComboBox *combo, m_bindCombos.keys()) {
            int idx = 0;
            QVariant field = ((QObject*)m_entity.data())->property(combo->objectName().toStdString().c_str());

            combo->clear();
            for (int i = 0; i < m_bindCombos[combo].size(); i++) {
                ComboData data = m_bindCombos[combo][i];
                combo->addItem(data.label(), data.index());

                if (data.index().canConvert<QObject*>()) {
                    ComboItem* ci = qobject_cast<ComboItem*>(data.index().value<QObject*>());
                    ComboItem* ciField = qobject_cast<ComboItem*>(field.value<QObject*>());
                    if (ci->eq(ciField)) {
                        idx = i;
                    }
                }
                else if (field == data.index()) {
                    idx = i;
                }
            }

            combo->setCurrentIndex(idx);
        }

        bindOtherToUi();
    }

    bool bindToData() {
        foreach (IValidator *val, m_validators) {
            if (!val->validate()) {
                emit validationError(val->errMessage());
                return false;
            }
        }

        foreach (QWidget *widget, m_bindWidgets) {
            const char* prop = widget->metaObject()->userProperty().name();
            ((QObject*)m_entity.data())->setProperty(widget->objectName().toStdString().c_str(), widget->property(prop));
        }

        foreach (QComboBox *combo, m_bindCombos.keys()) {
            ((QObject*)m_entity.data())->setProperty(combo->objectName().toStdString().c_str(), combo->currentData());
        }

        return bindOtherToData();
    }

public slots:
    bool saveRecord() {
        if (!bindToData())
        {
            return false;
        }

        if (!m_serviceConnected)
        {
            connect(service(), &IService::dbError, [this](QString msg) {
                QMessageBox::critical(this, tr("Database error"), tr(msg.toStdString().c_str()));
                m_saved = false;
            });
            connect(service(), &IService::dataChanged, [this]() {
                m_saved = true;
            });
            m_serviceConnected = true;
        }

        if (m_newRec) {
            service()->save(entity());
            if (m_saved)
            {
                emit recordAdded();
            }
        } else {
            service()->update(entity());
            if (m_saved)
            {
                emit recordUpdated();
            }
        }

        return m_saved;
    }

private:
    Service<T> *service() {
        IPlugin *plugin = Context::instance().plugin(pluginId());
        if (plugin == NULL) {
            Q_ASSERT(false);
            return NULL;
        }

        Service<T> *service = plugin->service<T>();
        if (service == NULL) {
            Q_ASSERT(false);
            return NULL;
        }

        return service;
    }

    bool m_serviceConnected;
    bool m_saved;
};

#endif // AUTOFORM_H