//
//  ButtonComponent.cpp
//
//  Basic on/off button.
//

#include "components/ButtonComponent.h"

#include "resources/Font.h"
#include "utils/StringUtil.h"

ButtonComponent::ButtonComponent(
    Window* window, const std::string& text,
    const std::string& helpText,
    const std::function<void()>& func)
    : GuiComponent(window),
    mBox(window, ":/graphics/button.png"),
    mFont(Font::get(FONT_SIZE_MEDIUM)),
    mFocused(false),
    mEnabled(true),
    mTextColorFocused(0xFFFFFFFF), mTextColorUnfocused(0x777777FF)
{
    setPressedFunc(func);
    setText(text, helpText);
    updateImage();
}

void ButtonComponent::onSizeChanged()
{
    mBox.fitTo(mSize, Vector3f::Zero(), Vector2f(-32, -32));
}

void ButtonComponent::setPressedFunc(std::function<void()> f)
{
    mPressedFunc = f;
}

bool ButtonComponent::input(InputConfig* config, Input input)
{
    if (config->isMappedTo("a", input) && input.value != 0) {
        if (mPressedFunc && mEnabled)
            mPressedFunc();
        return true;
    }

    return GuiComponent::input(config, input);
}

void ButtonComponent::setText(const std::string& text, const std::string& helpText)
{
    mText = Utils::String::toUpper(text);
    mHelpText = helpText;

    mTextCache = std::unique_ptr<TextCache>(mFont->buildTextCache(mText, 0, 0, getCurTextColor()));

    float minWidth = mFont->sizeText("DELETE").x() + 12;
    setSize(Math::max(mTextCache->metrics.size.x() + 12, minWidth), mTextCache->metrics.size.y());

    updateHelpPrompts();
}

void ButtonComponent::onFocusGained()
{
    mFocused = true;
    updateImage();
}

void ButtonComponent::onFocusLost()
{
    mFocused = false;
    updateImage();
}

void ButtonComponent::setEnabled(bool enabled)
{
    mEnabled = enabled;
    updateImage();
}

void ButtonComponent::updateImage()
{
    if (!mEnabled || !mPressedFunc) {
        mBox.setImagePath(":/graphics/button_filled.png");
        mBox.setCenterColor(0x770000FF);
        mBox.setEdgeColor(0x770000FF);
        return;
    }

    mBox.setCenterColor(0xFFFFFFFF);
    mBox.setEdgeColor(0xFFFFFFFF);
    mBox.setImagePath(mFocused ? ":/graphics/button_filled.png" : ":/graphics/button.png");
}

void ButtonComponent::render(const Transform4x4f& parentTrans)
{
    Transform4x4f trans = parentTrans * getTransform();

    mBox.render(trans);

    if (mTextCache) {
        Vector3f centerOffset((mSize.x() - mTextCache->metrics.size.x()) / 2,
                (mSize.y() - mTextCache->metrics.size.y()) / 2, 0);
        trans = trans.translate(centerOffset);

        Renderer::setMatrix(trans);
        mTextCache->setColor(getCurTextColor());
        mFont->renderTextCache(mTextCache.get());
        trans = trans.translate(-centerOffset);
    }

    renderChildren(trans);
}

unsigned int ButtonComponent::getCurTextColor() const
{
    if (!mFocused)
        return mTextColorUnfocused;
    else
        return mTextColorFocused;
}

std::vector<HelpPrompt> ButtonComponent::getHelpPrompts()
{
    std::vector<HelpPrompt> prompts;
    prompts.push_back(HelpPrompt("a", mHelpText.empty() ? mText.c_str() : mHelpText.c_str()));
    return prompts;
}