Lumacs/include/lumacs/modeline.hpp

#pragma once

#include <string>
#include <vector>
#include <memory>
#include <functional>

namespace lumacs {

class Window; // Forward declaration

/// @brief Represents a chunk of text in the modeline with a specific face.
struct ModelineChunk {
    std::string text;           ///< The text content to display.
    std::string face_name;      ///< The face name for styling (e.g., "mode-line", "mode-line-inactive").
};

/// @brief Interface for a modeline segment (e.g., buffer name, line number).
class ModelineSegment {
public:
    virtual ~ModelineSegment() = default;
    
    /// @brief Generate the text chunks for this segment.
    /// @param window The window context.
    /// @param active Whether the window is currently focused.
    /// @return A vector of styled text chunks.
    virtual std::vector<ModelineChunk> generate(const std::shared_ptr<Window>& window, bool active) = 0;
    
    /// @brief Get the unique name of the segment (for debugging/config).
    virtual std::string name() const = 0;
};

/// @brief Manages the composition of the modeline from various segments.
class ModelineManager {
public:
    ModelineManager();

    /// @brief Initialize the default set of segments.
    void create_default_segments();

    /// @brief Register a new segment to be displayed.
    void add_segment(std::shared_ptr<ModelineSegment> segment);

    /// @brief Remove all registered segments.
    void clear_segments();

    /// @brief Generate the complete modeline content for a specific window.
    /// @param window The window to generate modeline for.
    /// @param active Whether the window is active (focused).
    /// @return Full list of styled chunks.
    std::vector<ModelineChunk> generate_content(const std::shared_ptr<Window>& window, bool active);

private:
    std::vector<std::shared_ptr<ModelineSegment>> segments_;
};

} // namespace lumacs