#include "core/rendering/notifier.hpp"

#include "core/rendering/screen.hpp"
#include "core/rendering/surface.hpp"
#include "core/rendering/text.hpp"
#include "core/resources/resource_cache.hpp"
#include "utils/defines.hpp"

auto Notifier::get() -> Notifier& {
    static Notifier instance_;
    return instance_;
}

Notifier::~Notifier() = default;

void Notifier::init() {
    // El Director preloade la paleta "ui" i la surface "8bithud.gif" abans
    // de cridar aquest init(); ací només cal construir el Text.
    auto font_surface = Resource::Cache::get().getSurface("8bithud.gif");
    text_ = std::make_unique<Text>(font_surface, "data/font/8bithud.fnt");
}

void Notifier::update(int delta_ms) {
    const float DT = static_cast<float>(delta_ms) / 1000.0F;
    switch (status_) {
        case Status::RISING:
            y_ += SLIDE_SPEED * DT;
            if (y_ >= static_cast<float>(MARGIN_TOP)) {
                y_ = static_cast<float>(MARGIN_TOP);
                status_ = Status::ACTIVE;
            }
            break;
        case Status::ACTIVE:
            remaining_ms_ -= delta_ms;
            if (remaining_ms_ <= 0) { status_ = Status::VANISHING; }
            break;
        case Status::VANISHING:
            y_ -= SLIDE_SPEED * DT;
            if (y_ <= static_cast<float>(-HEIGHT)) {
                y_ = static_cast<float>(-HEIGHT - MARGIN_TOP);
                status_ = Status::HIDDEN;
            }
            break;
        default:
            break;
    }
}

void Notifier::render() {
    if (status_ == Status::HIDDEN || text_ == nullptr || current_text_.empty()) { return; }

    const int TEXT_W = text_->length(current_text_, 1);
    const int BOX_W = TEXT_W + (2 * PADDING_H);
    const int BOX_X = (GameCanvas::WIDTH - BOX_W) / 2;
    const int BOX_Y = static_cast<int>(y_);

    // Fons sòlid a través de la paleta "ui" (ARGB directe al canvas, sense
    // tocar cap surface paletada).
    const auto& ui_palette = Resource::Cache::get().getPalette("ui");
    Screen::get().fillRect(BOX_X, BOX_Y, BOX_W, HEIGHT, ui_palette[current_bg_color_]);

    text_->writeDX(Text::CENTER_FLAG | Text::COLOR_FLAG,
        GameCanvas::CENTER_X,
        BOX_Y + PADDING_V,
        current_text_,
        1,
        current_text_color_);
}

void Notifier::notify(const std::string& text, Uint8 text_color, Uint8 bg_color, int time_ms) {
    // Política simple: la nova notificació reemplaça la que hi havia. Per
    // gestionar-ne una cua, canviar ací per una FIFO quan calga.
    current_text_ = text;
    current_text_color_ = text_color;
    current_bg_color_ = bg_color;
    remaining_ms_ = time_ms;
    status_ = Status::RISING;
}