//===-- Editline.h ----------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_Editline_h_
#define liblldb_Editline_h_
#if defined(__cplusplus)

#include "lldb/lldb-private.h"

#include <stdio.h>
#ifdef _WIN32
#include "lldb/Host/windows/editlinewin.h"
#else
#include <histedit.h>
#endif

#include <string>
#include <vector>

#include "lldb/Host/Condition.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Host/Mutex.h"

namespace lldb_private {

//----------------------------------------------------------------------
/// @class Editline Editline.h "lldb/Host/Editline.h"
/// @brief A class that encapsulates editline functionality.
//----------------------------------------------------------------------
class Editline
{
public:
    typedef LineStatus (*LineCompletedCallbackType) (
        Editline *editline,
        StringList &lines,
        uint32_t line_idx,
        Error &error,
        void *baton);
    
    typedef int (*CompleteCallbackType) (
        const char *current_line,
        const char *cursor,
        const char *last_char,
        int skip_first_n_matches,
        int max_matches,
        StringList &matches,
        void *baton);

    typedef int (*GetCharCallbackType) (
        ::EditLine *,
        char *c);
    
    Editline(const char *prog,  // Used for the history file and for editrc program name
             const char *prompt,
             FILE *fin,
             FILE *fout,
             FILE *ferr);

    ~Editline();

    Error
    GetLine (std::string &line);

    Error
    GetLines (const std::string &end_line, StringList &lines);

    bool
    LoadHistory ();
    
    bool
    SaveHistory ();
    
    FILE *
    GetInputFile ();
    
    FILE *
    GetOutputFile ();
    
    FILE *
    GetErrorFile ();

    bool
    GettingLine () const
    {
        return m_getting_line;
    }

    void
    Hide ();

    void
    Refresh();

    void
    Interrupt ();

    void
    SetAutoCompleteCallback (CompleteCallbackType callback,
                             void *baton)
    {
        m_completion_callback = callback;
        m_completion_callback_baton = baton;
    }

    void
    SetLineCompleteCallback (LineCompletedCallbackType callback,
                             void *baton)
    {
        m_line_complete_callback = callback;
        m_line_complete_callback_baton = baton;
    }

    size_t
    Push (const char *bytes, size_t len);

    // Cache bytes and use them for input without using a FILE. Calling this function
    // will set the getc callback in the editline
    size_t
    SetInputBuffer (const char *c, size_t len);
    
    static int
    GetCharFromInputFileCallback (::EditLine *e, char *c);

    void
    SetGetCharCallback (GetCharCallbackType callback);
    
    const char *
    GetPrompt();
    
    void
    SetPrompt (const char *p);

private:

    Error
    PrivateGetLine(std::string &line);
    
    FileSpec
    GetHistoryFile();

    unsigned char
    HandleCompletion (int ch);
    
    int
    GetChar (char *c);


    static unsigned char
    CallbackEditPrevLine (::EditLine *e, int ch);
    
    static unsigned char
    CallbackEditNextLine (::EditLine *e, int ch);
    
    static unsigned char
    CallbackComplete (::EditLine *e, int ch);

    static const char *
    GetPromptCallback (::EditLine *e);

    static Editline *
    GetClientData (::EditLine *e);
    
    static FILE *
    GetFilePointer (::EditLine *e, int fd);

    static int
    GetCharInputBufferCallback (::EditLine *e, char *c);

    enum class Command
    {
        None = 0,
        EditPrevLine,
        EditNextLine,
    };
    ::EditLine *m_editline;
    ::History *m_history;
    ::HistEvent m_history_event;
    std::string m_program;
    std::string m_prompt;
    std::string m_lines_prompt;
    std::string m_getc_buffer;
    Mutex m_getc_mutex;
    Condition m_getc_cond;
    CompleteCallbackType m_completion_callback;
    void *m_completion_callback_baton;
//    Mutex m_gets_mutex; // Make sure only one thread
    LineCompletedCallbackType m_line_complete_callback;
    void *m_line_complete_callback_baton;
    Command m_lines_command;
    uint32_t m_lines_curr_line;
    uint32_t m_lines_max_line;
    bool m_prompt_with_line_numbers;
    bool m_getting_line;
    bool m_got_eof;    // Set to true when we detect EOF
    bool m_interrupted;
    
    DISALLOW_COPY_AND_ASSIGN(Editline);
};

} // namespace lldb_private

#endif  // #if defined(__cplusplus)
#endif  // liblldb_Host_h_