#ifndef GTL_GUI_LOG_VIEWER_H
#define GTL_GUI_LOG_VIEWER_H

#include <QWidget>
#include <QAbstractTableModel>
#include <QSortFilterProxyModel>
#include <QTableView>
#include <QComboBox>
#include <QPushButton>
#include <QLineEdit>
#include <QDateTime>
#include <QCalendarWidget>
#include <QAction>
#include <QWheelEvent>
#include <QScrollBar>

#include "gui_global.h"

#include "core/gtl_logger.h"

namespace gtl
{
    namespace gui
    {
        /* * * * * * * * * * * * * * * * * * * * * * * * * *
        *
        *                 main view model
        */
        class log_viewer_model : public QAbstractTableModel {
            Q_OBJECT
        public:
            log_viewer_model( QObject* parent = 0 );

            int rowCount( const QModelIndex& parent = QModelIndex() ) const;
            int columnCount( const QModelIndex& paren = QModelIndex() ) const;
            QVariant data( const QModelIndex& index, int role ) const;
            bool setData( const QModelIndex& index, const QVariant& value, int role );
            QVariant headerData( int section, Qt::Orientation orientation, int role ) const;

            void set_level_value(uint8_t val);
            void clear(void);
        public slots:
            void slt_append_string( const QString& level, const QString& date, const QString& time, const QString& tag, const QString& text );

        signals:
            void sgnl_set_data(void);

        private:
            enum Column {
                LEVEL = 0,
                DATE,
                TIME,
                TAG,
                TEXT,
                LAST
            };

            uint8_t m_select_levels;

            typedef QHash< Column, QVariant > LogViewerData;
            typedef QList< LogViewerData > Logs;
            Logs m_logs;
        };


        /* * * * * * * * * * * * * * * * * * * * * * * * * *
        *
        *                 proxy model
        */
        class filter_proxy_model : public QSortFilterProxyModel
        {
            Q_OBJECT

        public:
            filter_proxy_model(QObject *parent = nullptr);
            void set_filter_level(const QString &level);
            void set_search_string(const QString &str);

            void set_enable_search_string(void);
            void set_disable_search_string(void);

            void set_enable_date_filter(void);
            void set_disable_date_filter(void);

            void set_datetime_filter(QDateTime from, QDateTime to);

        protected:
            QString m_filter_level;
            QString m_search_string;

            QDateTime m_dt_from;
            QDateTime m_dt_to;

            bool m_enable_text_search;
            bool m_enable_date_filter;

            bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;

        private:
            bool check_date_in_range(QDateTime date) const;
        };


        /* * * * * * * * * * * * * * * * * * * * * * * * * *
        *
        *                 custom QTableView class
        */
        class MyTableVeiw : public QTableView
        {
            Q_OBJECT

        public:
            explicit MyTableVeiw(QWidget *parent = nullptr){};
            enum Rotate {
                NONE = 0,
                DOWN,
                UP
            };

            int flag_whell_rotate = DOWN;

        protected:
            virtual void wheelEvent(QWheelEvent *e) override
            {
                if (e->angleDelta().y() < 0)
                {
                    flag_whell_rotate = DOWN;
                }
                else
                {
                    flag_whell_rotate = UP;
                }
                QTableView::wheelEvent(e);
            };
        };


        /* * * * * * * * * * * * * * * * * * * * * * * * * *
        *
        *                 log_viewer
        */
        class GTL_GUI_EXPORT log_viewer : public QWidget
        {
            Q_OBJECT
        public:
            explicit log_viewer(QWidget *parent = nullptr);

        public slots:
            void slt_data_changed(void);
            void slt_rows_about_to_be_inserted();
            void slt_check_levels(int index);
            void slt_update_search_string(void);

            void slt_reset_search(void);
            void slt_dialog_set_datetime(void);
            void slt_update_dt(void);
            void slt_set_scroll_range(int min, int max);
            void slt_set_scroll_value();
            void slt_table_click(const QModelIndex &index);


        private:
            filter_proxy_model *m_proxy_model;

            MyTableVeiw *m_view;
            log_viewer_model *m_model;

            QModelIndex m_prev_index = QModelIndex();
            int m_prev_value = -1;

            QComboBox *m_cbb_level;

            QLineEdit *m_le_search_string;
            QLineEdit *m_le_search_date;
            QLineEdit *m_le_search_time;

            QLineEdit *m_le_dt_from;
            QLineEdit *m_le_dt_to;

            QAction *m_action_le_dt_from;
            QAction *m_action_le_dt_to;

            QDate m_date_from;
            QTime m_time_from;
            QDate m_date_to;
            QTime m_time_to;

            QPushButton *m_b_reset_search;
            QPushButton *m_b_clear_data;

            QCalendarWidget *m_calendar_widget;
            QDialog *m_dialog_set_datetime;

            int m_scroll_min;
            int m_scroll_max;
        };
    }
}

#endif // GTL_GUI_LOG_VIEWER_H