/**

Game Develop - Tile Map Extension
Copyright (c) 2014 Victor Levasseur (victorlevasseur52@gmail.com)

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

    1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.

    2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.

    3. This notice may not be removed or altered from any source
    distribution.

*/

#include "TileSetPanel.h"

#include <iostream>
#include <wx/dcbuffer.h>
#include "GDCore/IDE/CommonBitmapManager.h"

wxDEFINE_EVENT(TILE_SELECTION_CHANGED, TileSelectionEvent);

TileSetPanel::TileSetPanel(wxWindow* parent, wxWindowID id, const wxPoint &pos, const wxSize &size, long style) : 
    wxScrolledWindow(parent, id, pos, size, style),
    m_tileset(NULL),
    m_selectedCol(0),
    m_selectedRow(0)
{
    SetBackgroundStyle(wxBG_STYLE_PAINT);

    Connect(wxEVT_PAINT, wxPaintEventHandler(TileSetPanel::OnPaint), NULL, this);
    Connect(wxEVT_LEFT_DOWN, wxMouseEventHandler(TileSetPanel::OnLeftButtonPressed), NULL, this);
}

TileSetPanel::~TileSetPanel()
{

}

void TileSetPanel::SetTileSet(TileSet *tileset)
{
    m_tileset = tileset;
    Update();
}


void TileSetPanel::Update()
{
    SetScrollRate(1, 1);
    SetVirtualSize(m_tileset->GetSize().x, m_tileset->GetSize().y);
    Refresh();
}

void TileSetPanel::OnPaint(wxPaintEvent& event)
{
    wxAutoBufferedPaintDC dc(this);
    DoPrepareDC(dc);

    //Get the viewport
    wxPoint minPos = GetViewStart();
    int width, height;
    GetClientSize(&width, &height);
    wxPoint maxPos = minPos + wxPoint(width, height);

    if(m_tileset && !m_tileset->IsDirty())
    {
        //Determine the first and last columns and rows to draw
        int firstCol = std::max((int)(minPos.x / (m_tileset->tileSize.x + m_tileset->tileSpacing.x) - 1), 0);
        int firstRow = std::max((int)(minPos.y / (m_tileset->tileSize.y + m_tileset->tileSpacing.y) - 1), 0);
        int lastCol = std::min((int)(maxPos.x / (m_tileset->tileSize.x + m_tileset->tileSpacing.x) + 1), m_tileset->GetColumnsCount());
        int lastRow = std::min((int)(maxPos.y / (m_tileset->tileSize.y + m_tileset->tileSpacing.y) + 1), m_tileset->GetRowsCount());

        //Draw the background
        dc.SetBrush(gd::CommonBitmapManager::Get()->transparentBg);
        dc.DrawRectangle(minPos.x, minPos.y, width, height);


        //Draw the bitmap
        dc.DrawBitmap(m_tileset->GetWxBitmap(), 0, 0, false);

        //Draw the lines
        dc.SetPen(wxPen(wxColor(128, 128, 128, 255), 1));
        for(int row = firstRow; row < lastRow; row++)
        {
            dc.DrawLine(minPos.x, row * m_tileset->tileSize.y + (row - 1) * m_tileset->tileSpacing.y,
                        maxPos.x, row * m_tileset->tileSize.y + (row - 1) * m_tileset->tileSpacing.y);

            dc.DrawLine(minPos.x, row * m_tileset->tileSize.y + (row) * m_tileset->tileSpacing.y - 1,
                        maxPos.x, row * m_tileset->tileSize.y + (row) * m_tileset->tileSpacing.y - 1);

            for(int col = firstCol; col < lastCol; col++)
            {
                dc.DrawLine(col * m_tileset->tileSize.x + (col - 1) * m_tileset->tileSpacing.x, minPos.y,
                            col * m_tileset->tileSize.x + (col - 1) * m_tileset->tileSpacing.x, maxPos.y);

                dc.DrawLine(col * m_tileset->tileSize.x + (col) * m_tileset->tileSpacing.x - 1, minPos.y,
                            col * m_tileset->tileSize.x + (col) * m_tileset->tileSpacing.x - 1, maxPos.y);
            }
        }

        //Draw the selection
        if(m_selectedRow != -1 && m_selectedCol != -1)
        {
            dc.SetPen(wxPen(wxColor(0, 0, 255, 255), 4));
            dc.SetBrush(*wxTRANSPARENT_BRUSH);
            dc.DrawRectangle(GetPositionOfTile(m_selectedCol, m_selectedRow), wxSize(m_tileset->tileSize.x, m_tileset->tileSize.y));
        }
    }
    else
    {
        //Draw a white background with a text
        dc.SetBrush(*wxWHITE_BRUSH);
        dc.DrawRectangle(minPos.x, minPos.y, width, height);
        dc.DrawText(_("You haven't selected a tileset yet."), minPos.x + 16, minPos.y + 16);
    }
}

void TileSetPanel::OnLeftButtonPressed(wxMouseEvent& event)
{
    if(!m_tileset || m_tileset->IsDirty())
        return;

    wxPoint mousePos = CalcUnscrolledPosition(event.GetPosition());

    //Select the tile
    GetTileAt(mousePos, m_selectedCol, m_selectedRow);

    //Send the event
    TileSelectionEvent newEvent(TILE_SELECTION_CHANGED, GetId(), m_tileset->GetTileIDFromCell(m_selectedCol, m_selectedRow));
    newEvent.SetEventObject(this);
    ProcessWindowEvent(newEvent);

    Refresh();
}

wxPoint TileSetPanel::GetPositionOfTile(int column, int row)
{
    return wxPoint(column *(m_tileset->tileSize.x + m_tileset->tileSpacing.x), row * (m_tileset->tileSize.y + m_tileset->tileSpacing.y));
}

void TileSetPanel::GetTileAt(wxPoint position, int &tileCol, int &tileRow)
{
    if(m_tileset->tileSize.x == 0 || m_tileset->tileSize.y == 0)
    {
        tileCol = 0;
        tileRow = 0;
        return;
    }

    tileCol = (int)(position.x / (m_tileset->tileSize.x + m_tileset->tileSpacing.x));
    tileRow = (int)(position.y / (m_tileset->tileSize.y + m_tileset->tileSpacing.y));
}