Lumacs/include/lumacs/history_manager.hpp

#pragma once

#include <string>
#include <vector>
#include <numeric> // For std::iota

namespace lumacs {

/// @brief Manages history for a specific minibuffer type (e.g., commands, file paths).
class HistoryManager {
public:
    HistoryManager() : history_index_(0) {}

    /// @brief Adds an item to the history.
    /// Only adds if the item is not empty and not a duplicate of the last item.
    void add_item(const std::string& item) {
        if (!item.empty() && (history_.empty() || history_.back() != item)) {
            history_.push_back(item);
        }
        history_index_ = history_.size(); // Reset index to end after adding
    }

    /// @brief Navigates to the previous item in history.
    /// @return The previous item, or empty string if no more history.
    std::string previous() {
        if (!history_.empty()) {
            if (history_index_ > 0) {
                history_index_--;
            }
            return history_[history_index_];
        }
        return "";
    }

    /// @brief Navigates to the next item in history.
    /// @return The next item, or empty string if at the end of history.
    std::string next() {
        if (!history_.empty()) {
            if (history_index_ < history_.size() - 1) {
                history_index_++;
                return history_[history_index_];
            } else if (history_index_ == history_.size() - 1) {
                // If at the end, and pressing next, clear input (or original input before history nav)
                history_index_++; // Move past the last valid index
                return "";
            }
        }
        return "";
    }
    
    /// @brief Clears the history.
    void clear() {
        history_.clear();
        history_index_ = 0;
    }

    /// @brief Returns true if history is empty, false otherwise.
    bool empty() const {
        return history_.empty();
    }

private:
    std::vector<std::string> history_;
    size_t history_index_; // Current position in history
};

} // namespace lumacs