//
//  TextComponent.cpp
//
//  Displays text.
//

#include "components/TextComponent.h"

#include "utils/StringUtil.h"
#include "Log.h"
#include "Settings.h"

TextComponent::TextComponent(
        Window* window)
        : GuiComponent(window),
        mFont(Font::get(FONT_SIZE_MEDIUM)),
        mUppercase(false),
        mColor(0x000000FF),
        mAutoCalcExtent(true, true),
        mHorizontalAlignment(ALIGN_LEFT),
        mVerticalAlignment(ALIGN_CENTER),
        mLineSpacing(1.5f),
        mBgColor(0),
        mRenderBackground(false)
{
}

TextComponent::TextComponent(
        Window* window,
        const std::string& text,
        const std::shared_ptr<Font>& font,
        unsigned int color,
        Alignment align,
        Vector3f pos,
        Vector2f size,
        unsigned int bgcolor)
        : GuiComponent(window),
        mFont(nullptr),
        mUppercase(false),
        mColor(0x000000FF),
        mAutoCalcExtent(true, true),
        mHorizontalAlignment(align),
        mVerticalAlignment(ALIGN_CENTER),
        mLineSpacing(1.5f),
        mBgColor(0),
        mRenderBackground(false)
{
    setFont(font);
    setColor(color);
    setBackgroundColor(bgcolor);
    setText(text);
    setPosition(pos);
    setSize(size);
}

void TextComponent::onSizeChanged()
{
    mAutoCalcExtent = Vector2i((getSize().x() == 0), (getSize().y() == 0));
    onTextChanged();
}

void TextComponent::setFont(const std::shared_ptr<Font>& font)
{
    mFont = font;
    onTextChanged();
}

//  Set the color of the font/text.
void TextComponent::setColor(unsigned int color)
{
    mColor = color;
    mColorOpacity = mColor & 0x000000FF;
    onColorChanged();
}

//  Set the color of the background box.
void TextComponent::setBackgroundColor(unsigned int color)
{
    mBgColor = color;
    mBgColorOpacity = mBgColor & 0x000000FF;
}

void TextComponent::setRenderBackground(bool render)
{
    mRenderBackground = render;
}

//  Scale the opacity.
void TextComponent::setOpacity(unsigned char opacity)
{
    // This method is mostly called to do fading in-out of the Text component element.
    // Therefore, we assume here that opacity is a fractional value (expressed as an int 0-255),
    // of the opacity originally set with setColor() or setBackgroundColor().

    unsigned char o = (unsigned char)((float)opacity / 255.f * (float) mColorOpacity);
    mColor = (mColor & 0xFFFFFF00) | (unsigned char) o;

    unsigned char bgo = (unsigned char)((float)opacity / 255.f * (float)mBgColorOpacity);
    mBgColor = (mBgColor & 0xFFFFFF00) | (unsigned char)bgo;

    onColorChanged();
    GuiComponent::setOpacity(opacity);
}

unsigned char TextComponent::getOpacity() const
{
    return mColor & 0x000000FF;
}

void TextComponent::setText(const std::string& text)
{
    mText = text;
    onTextChanged();
}

void TextComponent::setUppercase(bool uppercase)
{
    mUppercase = uppercase;
    onTextChanged();
}

void TextComponent::render(const Transform4x4f& parentTrans)
{
    if (!isVisible())
        return;

    Transform4x4f trans = parentTrans * getTransform();

    if (mRenderBackground) {
        Renderer::setMatrix(trans);
        Renderer::drawRect(0.0f, 0.0f, mSize.x(), mSize.y(), mBgColor, mBgColor);
    }

    if (mTextCache) {
        const Vector2f& textSize = mTextCache->metrics.size;
        float yOff = 0;
        switch (mVerticalAlignment) {
            case ALIGN_TOP:
                yOff = 0;
                break;
            case ALIGN_BOTTOM:
                yOff = (getSize().y() - textSize.y());
                break;
            case ALIGN_CENTER:
                yOff = (getSize().y() - textSize.y()) / 2.0f;
                break;
            default:
                break;
        }
        Vector3f off(0, yOff, 0);

        if (Settings::getInstance()->getBool("DebugText")) {
            // Draw the "textbox" area, what we are aligned within.
            Renderer::setMatrix(trans);
            Renderer::drawRect(0.0f, 0.0f, mSize.x(), mSize.y(), 0xFF000033, 0xFF000033);
        }

        trans.translate(off);
        Renderer::setMatrix(trans);

        // Draw the text area, where the text actually is located.
        if (Settings::getInstance()->getBool("DebugText")) {
            switch (mHorizontalAlignment) {
            case ALIGN_LEFT:
                Renderer::drawRect(0.0f, 0.0f, mTextCache->metrics.size.x(),
                        mTextCache->metrics.size.y(), 0x00000033, 0x00000033);
                break;
            case ALIGN_CENTER:
                Renderer::drawRect((mSize.x() - mTextCache->metrics.size.x()) / 2.0f, 0.0f,
                        mTextCache->metrics.size.x(), mTextCache->metrics.size.y(),
                        0x00000033, 0x00000033);
                break;
            case ALIGN_RIGHT:
                Renderer::drawRect(mSize.x() - mTextCache->metrics.size.x(), 0.0f,
                        mTextCache->metrics.size.x(), mTextCache->metrics.size.y(),
                        0x00000033, 0x00000033);
                break;
            default:
                break;
            }
        }
        mFont->renderTextCache(mTextCache.get());
    }
}

void TextComponent::calculateExtent()
{
    if (mAutoCalcExtent.x()) {
        mSize = mFont->sizeText(mUppercase ? Utils::String::toUpper(mText) : mText, mLineSpacing);
    }
    else {
        if (mAutoCalcExtent.y())
            mSize[1] = mFont->sizeWrappedText(mUppercase ? Utils::String::toUpper(mText)
                    : mText, getSize().x(), mLineSpacing).y();
    }
}

void TextComponent::onTextChanged()
{
    calculateExtent();

    if (!mFont || mText.empty()) {
        mTextCache.reset();
        return;
    }

    std::string text = mUppercase ? Utils::String::toUpper(mText) : mText;

    std::shared_ptr<Font> f = mFont;
    const bool isMultiline = (mSize.y() == 0 || mSize.y() > f->getHeight()*1.2f);

    bool addAbbrev = false;
    if (!isMultiline) {
        size_t newline = text.find('\n');
        // Single line of text - stop at the first newline since it'll mess everything up.
        text = text.substr(0, newline);
        addAbbrev = newline != std::string::npos;
    }

    Vector2f size = f->sizeText(text);
    if (!isMultiline && mSize.x() && text.size() && (size.x() > mSize.x() || addAbbrev)) {
        // Abbreviate text.
        const std::string abbrev = "...";
        Vector2f abbrevSize = f->sizeText(abbrev);

        while (text.size() && size.x() + abbrevSize.x() > mSize.x()) {
            size_t newSize = Utils::String::prevCursor(text, text.size());
            text.erase(newSize, text.size() - newSize);
            size = f->sizeText(text);
        }

        text.append(abbrev);

        mTextCache = std::shared_ptr<TextCache>(f->buildTextCache(text, Vector2f(0, 0),
                (mColor >> 8 << 8) | mOpacity, mSize.x(), mHorizontalAlignment, mLineSpacing));
    }
    else {
        mTextCache = std::shared_ptr<TextCache>(f->buildTextCache(f->wrapText(
                text, mSize.x()), Vector2f(0, 0), (mColor >> 8 << 8) | mOpacity, mSize.x(),
                        mHorizontalAlignment, mLineSpacing));
    }
}

void TextComponent::onColorChanged()
{
    if (mTextCache)
        mTextCache->setColor(mColor);
}

void TextComponent::setHorizontalAlignment(Alignment align)
{
    mHorizontalAlignment = align;
    onTextChanged();
}

void TextComponent::setVerticalAlignment(Alignment align)
{
    mVerticalAlignment = align;
}

void TextComponent::setLineSpacing(float spacing)
{
    mLineSpacing = spacing;
    onTextChanged();
}

void TextComponent::setValue(const std::string& value)
{
    setText(value);
}

std::string TextComponent::getValue() const
{
    return mText;
}

void TextComponent::applyTheme(const std::shared_ptr<ThemeData>& theme, const std::string& view,
        const std::string& element, unsigned int properties)
{
    GuiComponent::applyTheme(theme, view, element, properties);

    using namespace ThemeFlags;

    const ThemeData::ThemeElement* elem = theme->getElement(view, element, "text");
    if (!elem)
        return;

    if (properties & COLOR && elem->has("color"))
        setColor(elem->get<unsigned int>("color"));

    setRenderBackground(false);
    if (properties & COLOR && elem->has("backgroundColor")) {
        setBackgroundColor(elem->get<unsigned int>("backgroundColor"));
        setRenderBackground(true);
    }

    if (properties & ALIGNMENT && elem->has("alignment")) {
        std::string str = elem->get<std::string>("alignment");
        if (str == "left")
            setHorizontalAlignment(ALIGN_LEFT);
        else if (str == "center")
            setHorizontalAlignment(ALIGN_CENTER);
        else if (str == "right")
            setHorizontalAlignment(ALIGN_RIGHT);
        else
            LOG(LogError) << "Unknown text alignment string: " << str;
    }

    if (properties & TEXT && elem->has("text"))
        setText(elem->get<std::string>("text"));

    if (properties & FORCE_UPPERCASE && elem->has("forceUppercase"))
        setUppercase(elem->get<bool>("forceUppercase"));

    if (properties & LINE_SPACING && elem->has("lineSpacing"))
        setLineSpacing(elem->get<float>("lineSpacing"));

    setFont(Font::getFromTheme(elem, properties, mFont));
}