cardboy/Firmware/sdk/apps/menu_app.cpp

#include "cardboy/apps/menu_app.hpp"

#include "cardboy/sdk/app_framework.hpp"
#include "cardboy/sdk/app_system.hpp"

#include "cardboy/gfx/font16x8.hpp"

#include <algorithm>
#include <cstdlib>
#include <string>
#include <string_view>
#include <vector>

namespace apps {

namespace {

using cardboy::sdk::AppContext;

using Framebuffer = typename AppContext::Framebuffer;

struct MenuEntry {
    std::string name;
    std::size_t index = 0;
};

class MenuApp final : public cardboy::sdk::IApp {
public:
    explicit MenuApp(AppContext& ctx) : context(ctx), framebuffer(ctx.framebuffer) { refreshEntries(); }

    void onStart() override {
        refreshEntries();
        dirty = true;
        renderIfNeeded();
    }

    void handleEvent(const cardboy::sdk::AppEvent& event) override {
        if (event.type != cardboy::sdk::AppEventType::Button)
            return;

        const auto& current  = event.button.current;
        const auto& previous = event.button.previous;

        if (current.left && !previous.left) {
            moveSelection(-1);
        } else if (current.right && !previous.right) {
            moveSelection(+1);
        }

        const bool launch = (current.a && !previous.a) || (current.select && !previous.select);
        if (launch)
            launchSelected();

        renderIfNeeded();
    }

private:
    AppContext&            context;
    Framebuffer&           framebuffer;
    std::vector<MenuEntry> entries;
    std::size_t            selected = 0;

    bool dirty = false;

    void moveSelection(int step) {
        if (entries.empty())
            return;
        const int count = static_cast<int>(entries.size());
        int       next  = static_cast<int>(selected) + step;
        next            = (next % count + count) % count;
        selected        = static_cast<std::size_t>(next);
        dirty           = true;
    }

    void launchSelected() {
        if (entries.empty())
            return;
        const auto target = entries[selected].index;
        if (context.system && context.system->currentFactoryIndex() == target)
            return;
        context.requestAppSwitchByIndex(target);
    }

    void refreshEntries() {
        entries.clear();
        if (!context.system)
            return;
        const std::size_t total = context.system->appCount();
        for (std::size_t i = 0; i < total; ++i) {
            const cardboy::sdk::IAppFactory* factory = context.system->factoryAt(i);
            if (!factory)
                continue;
            const char* name = factory->name();
            if (!name)
                continue;
            if (std::string_view(name) == kMenuAppNameView)
                continue;
            entries.push_back(MenuEntry{std::string(name), i});
        }
        if (selected >= entries.size())
            selected = entries.empty() ? 0 : entries.size() - 1;
        dirty = true;
    }

    static void drawCenteredText(Framebuffer& fb, int y, std::string_view text, int scale, int letterSpacing = 0) {
        const int width = font16x8::measureText(text, scale, letterSpacing);
        const int x     = (fb.width() - width) / 2;
        font16x8::drawText(fb, x, y, text, scale, true, letterSpacing);
    }

    void drawPagerDots() {
        if (entries.size() <= 1)
            return;
        const int count    = static_cast<int>(entries.size());
        const int spacing  = 20;
        const int dotSize  = 7;
        const int totalW   = spacing * (count - 1);
        const int startX   = (framebuffer.width() - totalW) / 2;
        const int baseline = framebuffer.height() - (font16x8::kGlyphHeight + 48);
        for (int i = 0; i < count; ++i) {
            const int cx = startX + i * spacing;
            for (int dx = -dotSize / 2; dx <= dotSize / 2; ++dx) {
                for (int dy = -dotSize / 2; dy <= dotSize / 2; ++dy) {
                    const bool isSelected = (static_cast<std::size_t>(i) == selected);
                    const bool on         = isSelected || std::abs(dx) == dotSize / 2 || std::abs(dy) == dotSize / 2;
                    if (on)
                        framebuffer.drawPixel(cx + dx, baseline + dy, true);
                }
            }
        }
    }

    void renderIfNeeded() {
        if (!dirty)
            return;
        dirty = false;

        framebuffer.beginFrame();
        framebuffer.clear(false);

        drawCenteredText(framebuffer, 24, "APPS", 1, 1);

        if (entries.empty()) {
            drawCenteredText(framebuffer, framebuffer.height() / 2 - 18, "NO OTHER APPS", 2, 1);
            drawCenteredText(framebuffer, framebuffer.height() - 72, "ADD MORE IN FIRMWARE", 1, 1);
        } else {
            const std::string& name       = entries[selected].name;
            const int          titleScale = 2;
            const int          centerY    = framebuffer.height() / 2 - (font16x8::kGlyphHeight * titleScale) / 2;
            drawCenteredText(framebuffer, centerY, name, titleScale, 0);

            const std::string indexLabel = std::to_string(selected + 1) + "/" + std::to_string(entries.size());
            const int         topRightX  = framebuffer.width() - font16x8::measureText(indexLabel, 1, 0) - 16;
            font16x8::drawText(framebuffer, topRightX, 20, indexLabel, 1, true, 0);

            drawPagerDots();
            drawCenteredText(framebuffer, framebuffer.height() - 48, "A/SELECT START", 1, 1);
            drawCenteredText(framebuffer, framebuffer.height() - 28, "L/R CHOOSE", 1, 1);
        }

        framebuffer.endFrame();
    }
};

class MenuAppFactory final : public cardboy::sdk::IAppFactory {
public:
    const char*           name() const override { return kMenuAppName; }
    std::unique_ptr<cardboy::sdk::IApp> create(cardboy::sdk::AppContext& context) override {
        return std::make_unique<MenuApp>(context);
    }
};

} // namespace

std::unique_ptr<cardboy::sdk::IAppFactory> createMenuAppFactory() { return std::make_unique<MenuAppFactory>(); }

} // namespace apps