/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2013-2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef _REPORTER_H_
#define _REPORTER_H_

#include <eda_units.h>
#include <wx/string.h>
#include <widgets/ui_common.h>

/**
 * @file reporter.h
 * @author Wayne Stambaugh
 * @note A special thanks to Dick Hollenbeck who came up with the idea that inspired
 *       me to write this.
 */

class wxStatusBar;
class wxTextCtrl;
class WX_HTML_REPORT_PANEL;
class WX_INFOBAR;


/**
 * A pure virtual class used to derive REPORTER objects from.
 *
 * The purpose of the REPORTER object is to offer a way for a procedural function
 * to report multiple errors without having to:
 * <ul>
 * <li> know too much about the caller's UI, i.e. wx. </li>
 * <li> stop after the first error </li>
 * </ul>
 * the reporter has 4 severity levels (flags) tagging the messages:
 *  - information
 *  - warning
 *  - error
 *  - action (i.e. indication of changes - add component, change footprint, etc. )
 *
 * They are indicators for the message formatting and displaying code,
 * filtering is not made here.
 */

class REPORTER
{
public:
    /**
     * Location where the message is to be reported.
     * LOC_HEAD messages are printed before all others (typically intro messages)
     * LOC_BODY messages are printed in the middle
     * LOC_TAIL messages are printed after all others (typically status messages)
     */
    enum LOCATION {
        LOC_HEAD = 0,
        LOC_BODY,
        LOC_TAIL
    };

    /**
     * Report a string with a given severity.
     *
     * @param aText is the string to report.
     * @param aSeverity is an indicator ( RPT_UNDEFINED, RPT_INFO, RPT_WARNING, RPT_ERROR,
     *                  RPT_ACTION ) used to filter and format messages
     */

    virtual REPORTER& Report( const wxString& aText,
                              SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) = 0;

    /**
     * Places the report at the end of the list, for objects that support report ordering
     */
    virtual REPORTER& ReportTail( const wxString& aText,
                                  SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED )
    {
        return Report( aText, aSeverity );
    }

    /**
     * Places the report at the beginning of the list for objects that support ordering.
     */
    virtual REPORTER& ReportHead( const wxString& aText,
                                  SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED )
    {
        return Report( aText, aSeverity );
    }

    REPORTER& Report( const char* aText, SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED );

    REPORTER& operator <<( const wxString& aText ) { return Report( aText ); }
    REPORTER& operator <<( const wxChar* aText ) { return Report( wxString( aText ) ); }
    REPORTER& operator <<( wxChar aChar ) { return Report( wxString( aChar ) ); }
    REPORTER& operator <<( const char* aText ) { return Report( aText ); }

    /**
     * Returns true if the reporter client is non-empty.
     */
    virtual bool HasMessage() const = 0;

    virtual EDA_UNITS GetUnits() const
    {
        return EDA_UNITS::MILLIMETRES;
    }

    virtual ~REPORTER()
    {
    }
};


/**
 * A wrapper for reporting to a wxTextCtrl object.
 */
class WX_TEXT_CTRL_REPORTER : public REPORTER
{
    wxTextCtrl* m_textCtrl;

public:
    WX_TEXT_CTRL_REPORTER( wxTextCtrl* aTextCtrl ) :
        REPORTER(),
        m_textCtrl( aTextCtrl )
    {
    }

    virtual ~WX_TEXT_CTRL_REPORTER()
    {
    }

    REPORTER& Report( const wxString& aText,
                      SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override;
};


/**
 * A wrapper for reporting to a wxString object.
 */
class WX_STRING_REPORTER : public REPORTER
{
    wxString* m_string;

public:
    WX_STRING_REPORTER( wxString* aString ) :
        REPORTER(),
        m_string( aString )
    {
    }

    virtual ~WX_STRING_REPORTER()
    {
    }

    REPORTER& Report( const wxString& aText, SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override;
};


/**
 * A wrapper for reporting to a wx HTML window.
 */
class WX_HTML_PANEL_REPORTER : public REPORTER
{
    WX_HTML_REPORT_PANEL* m_panel;

public:
    WX_HTML_PANEL_REPORTER( WX_HTML_REPORT_PANEL* aPanel ) :
        REPORTER(),
        m_panel( aPanel )
    {
    }

    virtual ~WX_HTML_PANEL_REPORTER()
    {
    }

    REPORTER& Report( const wxString& aText,
                      SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    REPORTER& ReportTail( const wxString& aText,
                          SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    REPORTER& ReportHead( const wxString& aText,
                          SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override;
};


/**
 * A singleton reporter that reports to nowhere.
 *
 * Used as to simplify code by avoiding the reportee to check for a non-NULL reporter object.
 */
class NULL_REPORTER : public REPORTER
{
public:
    NULL_REPORTER()
    {
    }

    virtual ~NULL_REPORTER()
    {
    }

    static REPORTER& GetInstance();

    REPORTER& Report( const wxString& aText,
                      SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override { return false; }
};


/**
 * Debug type reporter, forwarding messages to std::cout.
 */
class STDOUT_REPORTER : public REPORTER
{
public:
    STDOUT_REPORTER()
    {
    }

    virtual ~STDOUT_REPORTER()
    {
    }

    static REPORTER& GetInstance();

    REPORTER& Report( const wxString& aText,
                      SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override { return false; }
};


/**
 * A wrapper for reporting to a specific text location in a statusbar.
 */
class STATUSBAR_REPORTER : public REPORTER
{
public:
    STATUSBAR_REPORTER( wxStatusBar* aStatusBar, int aPosition = 0 )
            : REPORTER(),
              m_statusBar( aStatusBar ),
              m_position( aPosition )
    {
    }

    REPORTER& Report( const wxString& aText, SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override;

private:
    wxStatusBar* m_statusBar;
    int          m_position;
};


/**
 * A wrapper for reporting to a #WX_INFOBAR UI element.
 *
 * The infobar is not updated until the @c Finalize() method is called. That method will
 * queue either a show message or a dismiss event for the infobar - so this reporter is
 * safe to use inside a paint event without causing an infinite paint event loop.
 *
 * No action is taken if no message is given to the reporter.
 */
class INFOBAR_REPORTER : public REPORTER
{
public:
    INFOBAR_REPORTER( WX_INFOBAR* aInfoBar )
            : REPORTER(),
              m_messageSet( false ),
              m_infoBar( aInfoBar ),
              m_message( wxEmptyString ),
              m_severity( RPT_SEVERITY_UNDEFINED )
    {
    }

    REPORTER& Report( const wxString& aText,
                      SEVERITY aSeverity = RPT_SEVERITY_UNDEFINED ) override;

    bool HasMessage() const override;

    /**
     * Update the infobar with the reported text.
     */
    void Finalize();

private:
    bool        m_messageSet;
    WX_INFOBAR* m_infoBar;
    wxString    m_message;
    SEVERITY    m_severity;
};

#endif     // _REPORTER_H_