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+/*
+Minetest-c55
+Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef CHAT_HEADER
+#define CHAT_HEADER
+
+#include "common_irrlicht.h"
+#include <string>
+
+// Chat console related classes, only used by the client
+
+struct ChatLine
+{
+	// age in seconds
+	f32 age;
+	// name of sending player, or empty if sent by server
+	std::wstring name;
+	// message text
+	std::wstring text;
+
+	ChatLine(std::wstring a_name, std::wstring a_text):
+		age(0.0),
+		name(a_name),
+		text(a_text)
+	{
+	}
+};
+
+struct ChatFormattedFragment
+{
+	// text string
+	std::wstring text;
+	// starting column
+	u32 column;
+	// formatting
+	//u8 bold:1;
+};
+
+struct ChatFormattedLine
+{
+	// Array of text fragments
+	core::array<ChatFormattedFragment> fragments;
+	// true if first line of one formatted ChatLine
+	bool first;
+};
+
+class ChatBuffer
+{
+public:
+	ChatBuffer(u32 scrollback);
+	~ChatBuffer();
+
+	// Append chat line
+	// Removes oldest chat line if scrollback size is reached
+	void addLine(std::wstring name, std::wstring text);
+
+	// Remove all chat lines
+	void clear();
+
+	// Get number of lines currently in buffer.
+	u32 getLineCount() const;
+	// Get scrollback size, maximum number of lines in buffer.
+	u32 getScrollback() const;
+	// Get reference to i-th chat line.
+	const ChatLine& getLine(u32 index) const;
+
+	// Increase each chat line's age by dtime.
+	void step(f32 dtime);
+	// Delete oldest N chat lines.
+	void deleteOldest(u32 count);
+	// Delete lines older than maxAge.
+	void deleteByAge(f32 maxAge);
+
+	// Get number of columns, 0 if reformat has not been called yet.
+	u32 getColumns() const;
+	// Get number of rows, 0 if reformat has not been called yet.
+	u32 getRows() const;
+	// Update console size and reformat all formatted lines.
+	void reformat(u32 cols, u32 rows);
+	// Get formatted line for a given row (0 is top of screen).
+	// Only valid after reformat has been called at least once
+	const ChatFormattedLine& getFormattedLine(u32 row) const;
+	// Scrolling in formatted buffer (relative)
+	// positive rows == scroll up, negative rows == scroll down
+	void scroll(s32 rows);
+	// Scrolling in formatted buffer (absolute)
+	void scrollAbsolute(s32 scroll);
+	// Scroll to bottom of buffer (newest)
+	void scrollBottom();
+	// Scroll to top of buffer (oldest)
+	void scrollTop();
+
+	// Format a chat line for the given number of columns.
+	// Appends the formatted lines to the destination array and
+	// returns the number of formatted lines.
+	u32 formatChatLine(const ChatLine& line, u32 cols,
+			core::array<ChatFormattedLine>& destination) const;
+
+protected:
+	s32 getTopScrollPos() const;
+	s32 getBottomScrollPos() const;
+
+private:
+	// Scrollback size
+	u32 m_scrollback;
+	// Array of unformatted chat lines
+	core::array<ChatLine> m_unformatted;
+	
+	// Number of character columns in console
+	u32 m_cols;
+	// Number of character rows in console
+	u32 m_rows;
+	// Scroll position (console's top line index into m_formatted)
+	s32 m_scroll;
+	// Array of formatted lines
+	core::array<ChatFormattedLine> m_formatted;
+	// Empty formatted line, for error returns
+	ChatFormattedLine m_empty_formatted_line;
+};
+
+class ChatPrompt
+{
+public:
+	ChatPrompt(std::wstring prompt, u32 history_limit);
+	~ChatPrompt();
+
+	// Input character
+	void input(wchar_t ch);
+
+	// Submit, clear and return current line
+	std::wstring submit();
+
+	// Clear the current line
+	void clear();
+
+	// Replace the current line with the given text
+	void replace(std::wstring line);
+
+	// Select previous command from history
+	void historyPrev();
+	// Select next command from history
+	void historyNext();
+
+	// Nick completion
+	void nickCompletion(const core::list<std::wstring>& names, bool backwards);
+
+	// Update console size and reformat the visible portion of the prompt
+	void reformat(u32 cols);
+	// Get visible portion of the prompt.
+	std::wstring getVisiblePortion() const;
+	// Get cursor position (relative to visible portion). -1 if invalid
+	s32 getVisibleCursorPosition() const;
+
+	// Cursor operations
+	enum CursorOp {
+		CURSOROP_MOVE,
+		CURSOROP_DELETE
+	};
+
+	// Cursor operation direction
+	enum CursorOpDir {
+		CURSOROP_DIR_LEFT,
+		CURSOROP_DIR_RIGHT
+	};
+
+	// Cursor operation scope
+	enum CursorOpScope {
+		CURSOROP_SCOPE_CHARACTER,
+		CURSOROP_SCOPE_WORD,
+		CURSOROP_SCOPE_LINE
+	};
+
+	// Cursor operation
+	// op specifies whether it's a move or delete operation
+	// dir specifies whether the operation goes left or right
+	// scope specifies how far the operation will reach (char/word/line)
+	// Examples:
+	//   cursorOperation(CURSOROP_MOVE, CURSOROP_DIR_RIGHT, CURSOROP_SCOPE_LINE)
+	//     moves the cursor to the end of the line.
+	//   cursorOperation(CURSOROP_DELETE, CURSOROP_DIR_LEFT, CURSOROP_SCOPE_WORD)
+	//     deletes the word to the left of the cursor.
+	void cursorOperation(CursorOp op, CursorOpDir dir, CursorOpScope scope);
+
+protected:
+	// set m_view to ensure that 0 <= m_view <= m_cursor < m_view + m_cols
+	// if line can be fully shown, set m_view to zero
+	// else, also ensure m_view <= m_line.size() + 1 - m_cols
+	void clampView();
+
+private:
+	// Prompt prefix
+	std::wstring m_prompt;
+	// Currently edited line
+	std::wstring m_line;
+	// History buffer
+	core::array<std::wstring> m_history;
+	// History index (0 <= m_history_index <= m_history.size()) 
+	u32 m_history_index;
+	// Maximum number of history entries
+	u32 m_history_limit;
+
+	// Number of columns excluding columns reserved for the prompt
+	s32 m_cols;
+	// Start of visible portion (index into m_line)
+	s32 m_view;
+	// Cursor (index into m_line)
+	s32 m_cursor;
+
+	// Last nick completion start (index into m_line)
+	s32 m_nick_completion_start;
+	// Last nick completion start (index into m_line)
+	s32 m_nick_completion_end;
+};
+
+class ChatBackend
+{
+public:
+	ChatBackend();
+	~ChatBackend();
+
+	// Add chat message
+	void addMessage(std::wstring name, std::wstring text);
+	// Parse and add unparsed chat message
+	void addUnparsedMessage(std::wstring line);
+
+	// Get the console buffer
+	ChatBuffer& getConsoleBuffer();
+	// Get the recent messages buffer
+	ChatBuffer& getRecentBuffer();
+	// Concatenate all recent messages
+	std::wstring getRecentChat();
+	// Get the console prompt
+	ChatPrompt& getPrompt();
+
+	// Reformat all buffers
+	void reformat(u32 cols, u32 rows);
+
+	// Clear all recent messages
+	void clearRecentChat();
+
+	// Age recent messages
+	void step(float dtime);
+
+	// Scrolling
+	void scroll(s32 rows);
+	void scrollPageDown();
+	void scrollPageUp();
+
+private:
+	ChatBuffer m_console_buffer;
+	ChatBuffer m_recent_buffer;
+	ChatPrompt m_prompt;
+};
+
+#endif
+