//
// terminal.h
// Copyright 2020 Bruce Hill
// Released under the MIT License
//
// Definitions of some basic terminal stuff, like reading keys and some
// terminal escape sequences.
//

#ifndef FILE__TERMINAL_H
#define FILE__TERMINAL_H

#include <stdio.h>
#include <unistd.h>

// Maximum time in milliseconds between double clicks
#define DOUBLECLICK_THRESHOLD 200

typedef enum {
    // ASCII chars:
    KEY_CTRL_AT = 0x00,
    KEY_CTRL_A,
    KEY_CTRL_B,
    KEY_CTRL_C,
    KEY_CTRL_D,
    KEY_CTRL_E,
    KEY_CTRL_F,
    KEY_CTRL_G,
    KEY_CTRL_H,
    KEY_CTRL_I,
    KEY_CTRL_J,
    KEY_CTRL_K,
    KEY_CTRL_L,
    KEY_CTRL_M,
    KEY_CTRL_N,
    KEY_CTRL_O,
    KEY_CTRL_P,
    KEY_CTRL_Q,
    KEY_CTRL_R,
    KEY_CTRL_S,
    KEY_CTRL_T,
    KEY_CTRL_U,
    KEY_CTRL_V,
    KEY_CTRL_W,
    KEY_CTRL_X,
    KEY_CTRL_Y,
    KEY_CTRL_Z,
    KEY_CTRL_LSQ_BRACKET,
    KEY_CTRL_BACKSLASH,
    KEY_CTRL_RSQ_BRACKET,
    KEY_CTRL_CARET,
    KEY_CTRL_UNDERSCORE,
    KEY_SPACE,
    // Printable chars would be here
    KEY_BACKSPACE2 = 0x7F,

    // Non-ascii multi-byte keys:
    KEY_F0,
    KEY_F1,
    KEY_F2,
    KEY_F3,
    KEY_F4,
    KEY_F5,
    KEY_F6,
    KEY_F7,
    KEY_F8,
    KEY_F9,
    KEY_F10,
    KEY_F11,
    KEY_F12,
    KEY_INSERT,
    KEY_DELETE,
    KEY_HOME,
    KEY_END,
    KEY_PGUP,
    KEY_PGDN,
    KEY_ARROW_UP,
    KEY_ARROW_DOWN,
    KEY_ARROW_LEFT,
    KEY_ARROW_RIGHT,
    MOUSE_LEFT_PRESS,
    MOUSE_RIGHT_PRESS,
    MOUSE_MIDDLE_PRESS,
    MOUSE_LEFT_DRAG,
    MOUSE_RIGHT_DRAG,
    MOUSE_MIDDLE_DRAG,
    MOUSE_LEFT_RELEASE,
    MOUSE_RIGHT_RELEASE,
    MOUSE_MIDDLE_RELEASE,
    MOUSE_LEFT_DOUBLE,
    MOUSE_RIGHT_DOUBLE,
    MOUSE_MIDDLE_DOUBLE,
    MOUSE_WHEEL_RELEASE,
    MOUSE_WHEEL_PRESS,
} bkey_t;

#define MOD_BITSHIFT 9
#define MOD_META (1 << (MOD_BITSHIFT + 0))
#define MOD_CTRL (1 << (MOD_BITSHIFT + 1))
#define MOD_ALT (1 << (MOD_BITSHIFT + 2))
#define MOD_SHIFT (1 << (MOD_BITSHIFT + 3))

// Overlapping key codes:
#define KEY_CTRL_BACKTICK 0x00 /* clash with ^@ */
#define KEY_CTRL_2 0x00 /* clash with ^@ */
#define KEY_BACKSPACE 0x08 /* clash with ^H */
#define KEY_TAB 0x09 /* clash with ^I */
#define KEY_ENTER 0x0D /* clash with ^M */
#define KEY_ESC 0x1B /* clash with ^[ */
#define KEY_CTRL_3 0x1B /* clash with ^[ */
#define KEY_CTRL_4 0x1C /* clash with ^\ */
#define KEY_CTRL_5 0x1D /* clash with ^] */
#define KEY_CTRL_TILDE 0x1E /* clash with ^^ */
#define KEY_CTRL_6 0x1E /* clash with ^^ */
#define KEY_CTRL_7 0x1F /* clash with ^_ */
#define KEY_CTRL_SLASH 0x1F /* clash with ^_ */
#define KEY_SPACE 0x20
#define KEY_BACKSPACE2 0x7F
#define KEY_CTRL_8 0x7F /* clash with 'BACKSPACE2' */

// Terminal escape sequences:
#define T_WRAP "7"
#define T_SHOW_CURSOR "25"
#define T_MOUSE_XY "1000"
#define T_MOUSE_CELL "1002"
#define T_MOUSE_SGR "1006"
#define T_ALT_SCREEN "1049"
#define T_ON(opt) "\033[?" opt "h"
#define T_OFF(opt) "\033[?" opt "l"

#define move_cursor(f, x, y) fprintf((f), "\033[%d;%dH", (int)(y) + 1, (int)(x) + 1)
#define move_cursor_col(f, x) fprintf((f), "\033[%d`", (int)(x) + 1)

int bgetkey(FILE *in, int *mouse_x, int *mouse_y);
int bkeyname(int key, char *buf, size_t capacity);
int bkeywithname(const char *name);

#endif
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0