/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <wchar.h>

typedef unsigned uint;

enum {
	NUL, SOH, STX, ETX, EOT, ENQ, ACK, BEL,
	BS, HT, NL, VT, NP, CR, SO, SI,
	DLE, DC1, DC2, DC3, DC4, NAK, SYN, ETB,
	CAN, EM, SUB, ESC, FS, GS, RS, US,
	DEL = 0x7F,
};

enum Attr {
	Bold      = 1 << 0,
	Dim       = 1 << 1,
	Italic    = 1 << 2,
	Underline = 1 << 3,
	Blink     = 1 << 4,
	Reverse   = 1 << 5,
};

struct Style {
	enum Attr attr;
	int bg, fg;
};

struct Cell {
	struct Style style;
	wchar_t ch;
};

enum Mode {
	Insert = 1 << 0,
	Wrap   = 1 << 1,
	Cursor = 1 << 2,
};

enum { ParamCap = 16 };

struct Term {
	uint rows, cols;
	uint state;
	struct {
		uint s[ParamCap];
		uint n, i;
	} param;
	enum Mode mode;
	struct {
		uint y, x;
	} save;
	struct {
		uint top, bot;
	} scroll;
	uint y, x;
	uint charset;
	struct Style style;
	struct Cell cells[];
};

struct Term *termAlloc(uint rows, uint cols);
void termUpdate(struct Term *term, wchar_t ch);
int termSnapshot(struct Term *term, int fd);