#include "../include/Chatbar.hpp"
#include "../include/ResourceCache.hpp"
#include "../include/Settings.hpp"
#include <cmath>

using namespace std;

namespace dchat
{
    const float FONT_SIZE = 24;
    const float BOX_PADDING_X = 15.0f;
    const float BOX_PADDING_Y = 5.0f;
    
    Chatbar::Chatbar() : 
        text("", ResourceCache::getFont("fonts/Roboto-Regular.ttf"), FONT_SIZE * Settings::getScaling()),
        caretIndex(0)
    {
        text.setFillColor(sf::Color(240, 240, 240));
        background.setFillColor(sf::Color(60, 60, 60));
    }
    
    void Chatbar::addChar(sf::Uint32 codePoint)
    {
        auto str = text.getString();
        str.insert(caretIndex, codePoint);
        text.setString(str);
        ++caretIndex;
        caretOffset = text.findCharacterPos(caretIndex) - text.getPosition();
    }
    
    const sf::String& Chatbar::getString() const
    {
        return text.getString();
    }
    
    void Chatbar::removePreviousChar()
    {
        if(caretIndex > 0)
        {
            auto str = text.getString();
            str.erase(caretIndex - 1);
            text.setString(str);
            --caretIndex;
            caretOffset = text.findCharacterPos(caretIndex) - text.getPosition();
        }
    }
    
    void Chatbar::removeNextChar()
    {
        if(caretIndex < text.getString().getSize())
        {
            auto str = text.getString();
            str.erase(caretIndex);
            text.setString(str);
        }
    }
    
    void Chatbar::clear()
    {
        text.setString("");
        caretIndex = 0;
        caretOffset.x = 0.0f;
        caretOffset.y = 0.0f;
    }
    
    void Chatbar::moveCaretLeft()
    {
        caretIndex = max(0, caretIndex - 1);
        // TODO: Use glyph size to optimize this, no need to iterate all glyphs
        caretOffset = text.findCharacterPos(caretIndex) - text.getPosition();
    }
    
    void Chatbar::moveCaretRight()
    {
        caretIndex = min((int)text.getString().getSize(), caretIndex + 1);
        caretOffset = text.findCharacterPos(caretIndex) - text.getPosition();
    }
    
    void Chatbar::draw(sf::RenderWindow &window)
    {
        auto windowSize = window.getSize();
        
        sf::Vector2f backgroundSize(floor(windowSize.x * 0.7f), floor(text.getCharacterSize() * 1.7f + BOX_PADDING_Y * 2.0f));
        sf::Vector2f backgroundPos(floor(windowSize.x * 0.5f - backgroundSize.x * 0.5f), floor(windowSize.y - backgroundSize.y - 20.0f));
        background.setSize(backgroundSize);
        background.setPosition(backgroundPos);
        text.setPosition(floor(backgroundPos.x + BOX_PADDING_X), floor(backgroundPos.y + backgroundSize.y * 0.5f - text.getCharacterSize() * 0.5f));
        
        window.draw(background);
        window.draw(text);
        
        sf::RectangleShape caretShape(sf::Vector2f(2.0f, backgroundSize.y - BOX_PADDING_Y * 2.0f));
        caretShape.setPosition(floor(text.getPosition().x + caretOffset.x), backgroundPos.y + BOX_PADDING_Y);
        window.draw(caretShape);
    }
}