/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/
// Original file Copyright Crytek GMBH or its affiliates, used under license.

// Description : Console implementation for UNIX systems, based on curses ncurses.


#pragma once


#include <IConsole.h>
#include <ITextModeConsole.h>
#include <INetwork.h>

#if defined(USE_DEDICATED_SERVER_CONSOLE)

class CSyslogStats
{
public:
    CSyslogStats();
    ~CSyslogStats();

    void Init();
    void Update(float srvRate, int numPlayers);

private:
    int m_syslog_stats;
    int m_syslog_period;
    CTimeValue m_syslogStartTime;
    CTimeValue m_syslogCurrTime;
    static const int SYSLOG_DEFAULT_PERIOD = 3000; // default timeout (sec)
};

#if defined(USE_UNIXCONSOLE)

#if defined(WIN32)
// Avoid naming conflict with wincon.h.
#undef MOUSE_MOVED
#endif

#include <CryThread.h>
#include <ncurses.h>

// Avoid naming conflicts with pdcurses.
// Use werase(stdscr) instead of erase().
#undef erase
// Use wclear(stdscr) instead of clear().
#undef clear
// (MATT) Could not compile CONTAINER_VALUE etc templates for Vector{Map,Set} in ISerialise apparently because of the
// clear and erase macros. Changed order to undefine them straight after pdcurses. {2009/04/09}

#include <deque>


// Define if you wish to enable the player count feature.
// Note: The player count feature can not be used when building
// Windows-style DLLs!
#if defined(LINUX) || defined(MAC)
#define UC_ENABLE_PLAYER_COUNT 1
#else
#undef UC_ENABLE_PLAYER_COUNT
#endif

// Define if you wish to enable magic console commands.
// These are commands starting with an '@' character, which are intercepted by
// the CUNIXConsole class and not passed to the system.
//#undef UC_ENABLE_MAGIC_COMMANDS
#define UC_ENABLE_MAGIC_COMMANDS 1

class CUNIXConsoleInputThread;
class CUNIXConsoleSignalHandler;


class CUNIXConsole
    : public ISystemUserCallback
    , public IOutputPrintSink
    , public ITextModeConsole
{
    friend class CUNIXConsoleInputThread;
    friend class CUNIXConsoleSignalHandler;

    static const int DEFAULT_COLOR = -1;

    typedef CryMutex ConsoleLock;
    ConsoleLock m_Lock;
    static CryCriticalSectionNonRecursive m_cleanupLock;

    enum EConDrawOp
    {
        eCDO_PutText,
    };
    struct SConDrawCmd
    {
        EConDrawOp op;
        int x, y;
        char text[256];
    };
    DynArray<SConDrawCmd> m_drawCmds;
    DynArray<SConDrawCmd> m_newCmds;
    bool m_fsMode;

    CSyslogStats m_syslogStats;
    bool m_bShowConsole; // hide or show console

    SSystemUpdateStats   m_updStats;

    bool IsLocked() { return m_Lock.IsLocked(); }

    // The header string.
    //
    // Should be set by the launcher through SetHeader().
    string m_HeaderString;

    // The line buffer.
    //
    // We'll use the escape sequence "\1" followed by a digit to encode color
    // changes.
    typedef std::deque<string> TLineBuffer;
    TLineBuffer m_LineBuffer;

    // The command queue.
    //
    // Commands typed on the console are added to this command queue.  It is
    // processed by the OnUpdate() callback.
    typedef std::deque<string> TCommandQueue;
    TCommandQueue m_CommandQueue;

    // The command history.
    //
    // The UNIX console is decoupled from the system console object through a
    // command queue, so we can't use the history buffer from the system
    // console.  This is our own command history.
    //
    // The history index indicates the reverse index (counting from the end)
    // into our command history.  The special value -1 indicates that we're not
    // currently showing a command from the history.
    typedef std::deque<string> TCommandHistory;
    TCommandHistory m_CommandHistory;
    int m_HistoryIndex;

    // Interactive prompt.
    //
    // If this is not empty, then this prompt is shown in the command area.  The
    // input thread will wait for one if the response characters.  The response is
    // stored to m_PromptResponse and m_PromptCond is notified.
    string m_Prompt;
    char m_PromptResponseChars[16]; // Null-terminated.
    char m_PromptResponse;
    CryConditionVariable m_PromptCond;

    ISystem* m_pSystem;
    IConsole* m_pConsole;
    ITimer* m_pTimer; // Initialized on the first call to OnUpdate().

    // Flag indicating if OnUpdate() has been called.
    //
    // The initialization of the console variable pointers for 'sv_map' and
    // 'sv_gamerules' is deferred until the first iteration of the update loop,
    // because OnInit() is called too early for that.
    bool m_OnUpdateCalled;
    CTimeValue m_LastUpdateTime;

    ICVar* m_svMap;
    ICVar* m_svGameRules;

    // Terminal window layout.
    //
    // The terminal window is split into 4 logical windows.  Top to bottom,
    // these windows are:
    // - Header window.  May be empty (height 0).
    // - Log window.  This is the area in the middle of the terminal showing the
    //   log messages.
    // - Status window.  This is a window below the log window showing things
    //   like current FPS or other status information.
    // - Command window.  This is a few lines (typically 1 or 2) at the
    //   bottom of the terminal window.  The command prompt and command line
    //   editor is shown in the command window.
    //
    // The layout is implementated as a single curses window - the standard
    // screen (stdscr).

    // The width and height of the terminal window.
    unsigned m_Width, m_Height;

    // The height of the header window.
    // The header window is displayed at the top of the terminal window.
    // Typically 0 (no header) or 1 (single header line).
    unsigned m_HeaderHeight;

    // The height of the status window.
    // This is typically a single line between the log window and the command
    // window, displayed in inverse video.
    unsigned m_StatusHeight;

    // The height of the command window.
    // This is typically a single line at the bottom of the screen.
    unsigned m_CmdHeight;

    // The current text color.
    int m_Color;

    // The default text color pair (read from curses when the app starts).
    int m_DefaultColorPair;

    // Flag indicating if color output is enabled.
    bool m_EnableColor;

    // Flag indicating that the window has been resized.
    // Set by the SIGWINCH signal handler.
    bool m_WindowResized;

    // Flag indicating that OnShutdown() has been called.
    bool m_OnShutdownCalled;

    // Flag indicating if the console has been initialized (i.e. Init() has been
    // called).
    bool m_Initialized;

    // Flag indicating if the implied console initialization (performed by the
    // OnInit() callback) requires a dedicated server.
    // This flag is set through the public SetRequireDedicatedServer() method.
    bool m_RequireDedicatedServer;

    // The number of (logical) lines scrolled up.
    // 0 indicates that we're at the bottom of the log.
    int m_ScrollUp;

    // Array of color pair handles.
    // 0: default terminal color
    // 1: default terminal color, reverse video
    // 2: blue
    // 3: green
    // 4: red, bold font
    // 5: cyan
    // 6: yellow on black, bold font
    // 7: magenta
    // 8: red, normal text
    // 9: black on white
    short m_ColorPair[10];

    // The keyboard input thread.
    CUNIXConsoleInputThread* m_InputThread;

    // The current input line, cursor position, and horizontal scroll position.
    string m_InputLine;
    string m_SavedInputLine;
    int m_CursorPosition;
    int m_ScrollPosition;

    // The current progress status string.
    //
    // Set by the OnInitProgress() method and cleared by OnUpdate().  If this is
    // not empty, then this is shown in the status line.
    string m_ProgressStatus;

    // Set the size of the terminal window.
    //
    // This method is called when the UNIX console is created and whenever the
    // size of the terminal window changes (i.e. SIGWINCH received).
    //
    // We're relying on the ncurses handler for SIGWINCH, so we'll call this
    // method when getch() returns KEY_RESIZE.
    void SetSize(unsigned width, unsigned height);

    // Check if the terminal window is too small for drawing.
    bool IsTooSmall();

    // Check if the window size has changed.
    void CheckResize();

    // Get the height of the log window.
    unsigned GetLogHeight()
    {
        return m_Height - m_HeaderHeight - m_StatusHeight - m_CmdHeight;
    }

    // Scroll the log window and start a new log line.
    //
    // Move the cursor position to the beginning of the new log line.
    void NewLine();

    // Continue the last log line.
    //
    // Move the cursor position to the first character following the last
    // character logged and update the current color.
    void ContinueLine();

    // Clear the current output line.
    //
    // Move the cursor to the beginning of the current output line.
    //
    // Note: This is a bit fuzzy to implement because long wrapped lines are not
    // easy to deal with.  Instead I'll simply call NewLine() and maybe
    // implement this later.
    void ClearLine() { NewLine(); }

    // Set the output color.
    //
    // The color is one of the 10 color codes (0-9) used by the graphical
    // console.  If color output is enabled, then the corresponding terminal
    // color is set.  If color output is not enabled, then only the text
    // attributes are changed.
    //
    // In addition to setting the color (if enabled), the method will set the
    // following terminal attributes:
    //   0, 1: Normal text (black, white)
    //   4, 6: Bold text (red, yellow, typically indicates an error or warning)
    //   other: Underlined text
    void SetColor(int color = DEFAULT_COLOR);
    void SetColorRaw(int color);

    // Write a single character or a sequence of characters to the console,
    // using the currently specified color.  The specified character must be a
    // printable character.
    //
    // Note:
    // - The Put(const char *) method will interpret '\n' as a line separator an
    //   call NewLine() when encountered.  All other characters must be
    //   printable characters.
    // - Both Put() methods will _not_ update the cursor position before writing
    //   the character to the screen.  It is up to the caller to update the
    //   cursor position (either by calling NewLine() or ContinueLine()).
    void Put(int c);
    void Put(const char* s);

    // Get the length of the line (number of displayed characters), not counting
    // color change escapes.
    static unsigned GetLineLength(const string& line);

    // Get the last printable character from the specified line.  It is an error
    // if the specified line contains no printable characters.  If color is not
    // NULL, then the selected color for the last character is stored to *color.
    static char GetLastCharacter(const string& line, int* color);

    // Get the height of a line of text.
    //
    // The method returns the number of terminal lines to display the specified
    // line (wrapped).  If column is not NULL, then *column is set to the column
    // indicating the end of the last wrapped terminal line.
    unsigned GetLineHeight(const string& line, unsigned* column = NULL);

    // Scroll the log window one line.
    void ScrollLog();

    // Flush/repaint the screen.
    void Flush();

    // Called by the input thread when idle.
    void InputIdle();

    // Lock/unlock the UNIX console.
    void Lock() { m_Lock.Lock(); }
    void Unlock() { m_Lock.Unlock(); }

    // Fix the cursor position and scroll position after updating the command
    // input line.  Returns true if the command window must be repainted.
    bool FixCursorPosition();

    // Called when the command line has been edited.
    void OnEdit();

    // Keyboard input.
    void KeyEnter();
    void KeyUp();
    void KeyDown();
    void KeyLeft();
    void KeyRight();
    void KeyHome(bool ctrl);
    void KeyEnd(bool ctrl);
    void KeyBackspace();
    void KeyDelete();
    void KeyDeleteWord();
    void KeyKill();
    void KeyRepaint();
    void KeyTab();
    void KeyPgUp(bool ctrl);
    void KeyPgDown(bool ctrl);
    void KeyF(int id);
    void Key(int c);

    // Drawing.
    void Repaint();
    void DrawHeader();
    unsigned DrawLogLine(const string&, bool noOutput = false);
    void DrawLog();
    void DrawFullscreen();
    void DrawStatus(int maxLines = -1);
    void DrawCmd(bool cursorOnly = false);
    void DrawCmdPrompt();

    CUNIXConsole(const CUNIXConsole&);
    void operator = (const CUNIXConsole&);

public:
    CUNIXConsole();
    ~CUNIXConsole();

    // Set or clear the RequireDedicatedServer flag.
    // The implied initialization call performed by the
    // ISystemUserCallback::OnInit() depends on this flag.
    // Note: This method _must_ be called before Init() or OnInit() is called.
    void SetRequireDedicatedServer(bool);

    // Initialize the console for use.
    //
    // This method must be called before any other method of the console is
    // called.
    // It is perfectly valid to instanciate a console and not use it (i.e. skip
    // the Init() call).
    //
    // Note: If the ISystemUserCallback interface is used, then the call to
    // Init() is optional.  OnInit() will call Init() if it has not been called
    // already.
    void Init(const char* headerString = NULL);

    // Check if the console is initialized.
    bool IsInitialized() { return m_Initialized; }

    // Cleanup function.
    // This method is called by the destructor.
    // If the instance has not been initialized (via Init() and/or OnInit()),
    // then this method has no effect.
    void Cleanup();

    // Set the header string.
    // Note:
    // - Setting the header string does _not_ trigger a redraw.
    // - This method may be called before Init() has been called.
    void SetHeader(const char* headerString)
    {
        Lock();
        m_HeaderString = headerString;
        Unlock();
    }

    // Issue a query-response prompt.
    //
    // promptString is the string to be shown as the query prompt.
    // responseChars is a null-terminated string of valid response characters.
    // Add '@' to the response characters if the user may type any character.
    //
    // The method blocks the caller until the user has typed a response.  The
    // return value is the response character typed by the user.
    DLL_EXPORT char Prompt(const char* promptString, const char* responseChars);

    // Check if the calling thread is the input thread.
    //
    // This may be used to make sure that you're not calling Prompt() from the
    // input thread - which will deadlock.
    DLL_EXPORT bool IsInputThread();

    // Print formatted.  Calls Print().
    DLL_EXPORT void PrintF(const char* format, ...) PRINTF_PARAMS(2, 3);

    // Interface IOutputPrintSink /////////////////////////////////////////////
    DLL_EXPORT virtual void Print(const char* line);

    // Interface ISystemUserCallback //////////////////////////////////////////
    virtual bool OnError(const char* errorString);
    virtual bool OnSaveDocument() { return false; }
    virtual bool OnBackupDocument() { return false; }
    virtual void OnProcessSwitch() { }
    virtual void OnInitProgress(const char* sProgressMsg);
    virtual void OnInit(ISystem*);
    virtual void OnShutdown();
    virtual void OnUpdate();
    virtual void GetMemoryUsage(ICrySizer* pSizer);

    // Interface ITextModeConsole /////////////////////////////////////////////
    virtual Vec2_tpl<int> BeginDraw();
    virtual void PutText(int x, int y, const char* msg);
    virtual void EndDraw();
};

#endif // USE_UNIXCONSOLE

#if defined(AZ_RESTRICTED_PLATFORM)
    #if defined(AZ_PLATFORM_XENIA)
        #include "Xenia/UnixConsole_h_xenia.inl"
    #elif defined(AZ_PLATFORM_PROVO)
        #include "Provo/UnixConsole_h_provo.inl"
    #elif defined(AZ_PLATFORM_SALEM)
        #include "Salem/UnixConsole_h_salem.inl"
    #endif
#endif
#if defined(AZ_RESTRICTED_SECTION_IMPLEMENTED)
#undef AZ_RESTRICTED_SECTION_IMPLEMENTED
#else
// simple light-weight console
class CNULLConsole
    : public IOutputPrintSink
    , public ISystemUserCallback
    , public ITextModeConsole
{
public:
    CNULLConsole(bool isDaemonMode);

    ///////////////////////////////////////////////////////////////////////////////////////
    // IOutputPrintSink
    ///////////////////////////////////////////////////////////////////////////////////////
    virtual void Print(const char* inszText);

    ///////////////////////////////////////////////////////////////////////////////////////
    // ISystemUserCallback
    ///////////////////////////////////////////////////////////////////////////////////////
    /** this method is called at the earliest point the ISystem pointer can be used
    the log might not be yet there
    */
    virtual void OnSystemConnect(ISystem* pSystem) {};
    /** Signals to User that engine error occured.
    @return true to Halt execution or false to ignore this error.
    */
    virtual bool OnError(const char* szErrorString) { return false; };
    /** If working in Editor environment notify user that engine want to Save current document.
    This happens if critical error have occured and engine gives a user way to save data and not lose it
    due to crash.
    */
    virtual bool OnSaveDocument() { return false; }

    /** If working in Editor environment and a critical error occurs notify the user to backup
    the current document to prevent data loss due to crash.
    */
    virtual bool OnBackupDocument() { return false; }

    /** Notify user that system wants to switch out of current process.
    (For ex. Called when pressing ESC in game mode to go to Menu).
    */
    virtual void OnProcessSwitch() {};

    // Notify user, usually editor about initialization progress in system.
    virtual void OnInitProgress(const char* sProgressMsg) {};

    // Initialization callback.  This is called early in CSystem::Init(), before
    // any of the other callback methods is called.
    virtual void OnInit(ISystem*);

    // Shutdown callback.
    virtual void OnShutdown() {};

    // Notify user of an update iteration.  Called in the update loop.
    virtual void OnUpdate();

    // to collect the memory information in the user program/application
    virtual void GetMemoryUsage(ICrySizer* pSizer) {};

    ///////////////////////////////////////////////////////////////////////////////////////
    // ITextModeConsole
    ///////////////////////////////////////////////////////////////////////////////////////
    virtual Vec2_tpl<int> BeginDraw() { return Vec2_tpl<int>(0, 0); };
    virtual void PutText(int x, int y, const char* msg);
    virtual void EndDraw() {};

    void SetRequireDedicatedServer(bool)
    {
        // Does nothing
    }
    void SetHeader(const char*)
    {
        //Does nothing
    }
private:
#if defined(WIN32) || defined(WIN64)
    HANDLE m_hOut;
#endif
    bool m_isDaemon;
    CSyslogStats m_syslogStats;
};

#endif

#endif // defined(USE_DEDICATED_SERVER_CONSOLE)