App.cppm

// This project is licensed under the GPL-3.0 License. See the LICENSE file for details, or check out <gnu.org>.
// Copyright (C) 2026 mxreal64

// 1. Global Module Fragments for External C Type Definitions
module;
#include <SDL3/SDL.h>
#include <SDL3_ttf/SDL_ttf.h>

// 2. Primary Module Interface Exports Layer
export module delta.app;

// Combine and expose sub-module partitions seamlessly to the outside world
export import :buffer;
export import :events;
import delta.types;
import delta.engine;
import std;

export class DeltaApp {
private:
    DocumentBuffer doc_;
    EventController controller_;
    std::vector<LayoutLine> current_layout_;
    selection_span sel_;
    bool running_ = true;

public:
    DeltaApp() noexcept = default;

    [[nodiscard]] std::expected<void, DeltaError> handle_event(const SDL_Event& event, TTF_Font* font) noexcept {
        bool changed = controller_.process_input(event, doc_, sel_, font, current_layout_, running_);
        
        if (changed || current_layout_.empty()) {
            current_layout_ = compute_text_layout(font, doc_.get_raw());
        }
        return {};
    }

    [[nodiscard]] bool is_running() const noexcept { return running_; }
    [[nodiscard]] const std::string& get_buffer() const noexcept { return doc_.get_raw(); }
    [[nodiscard]] const std::vector<LayoutLine>& get_layout() const noexcept { return current_layout_; }
    [[nodiscard]] const selection_span& get_selection() const noexcept { return sel_; }
};