#pragma once

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

#include "Completion.h"

// Reads one line with cursor editing, history (up/down) and tab completion.
// Falls back to plain std::getline when stdin/stdout are not a terminal.
class LineEditor {
public:
    using CompletionFn = std::function<Completion(const std::string& textBeforeCursor)>;

    LineEditor();

    void setCompleter(const CompletionFn& completer);
    void setHistoryFile(const std::string& path);  // loads it and appends new entries
    void addHistory(const std::string& line);

    // Returns false on end of input (Ctrl-D on an empty line, or closed stdin).
    bool readLine(const std::string& prompt, std::string& line);

private:
    bool readPlain(const std::string& prompt, std::string& line);
    bool readInteractive(const std::string& prompt, std::string& line);

    CompletionFn completer_;
    std::vector<std::string> history_;
    std::string historyFile_;
};