#include <blue/term/tty.h>
#include "../../tty.h"
#include <stdio.h>
#include <string.h>
#include <Windows.h>
#include <io.h>
#include <stdbool.h>

#define ANSI_BOLD_ON          "1"
#define ANSI_BOLD_OFF         "22"
#define ANSI_ITALIC_ON        "3"
#define ANSI_ITALIC_OFF       "23"
#define ANSI_UNDERLINE_ON     "4"
#define ANSI_UNDERLINE_OFF    "24"

#define ANSI_DEFAULTCOLOUR_FG "39"
#define ANSI_DEFAULTCOLOUR_BG "49"

#define ANSI_256COLOUR_FG     "38;5"
#define ANSI_256COLOUR_BG     "48;5"

#define ANSI_TRUECOLOUR_FG    "38;2"
#define ANSI_TRUECOLOUR_BG    "48;2"

enum tty_flags {
	B_TTY_INIT = 0x01u,
	B_TTY_INTERACTIVE = 0x02u,
};

struct b_tty {
	HANDLE t_in, t_out;
	DWORD t_canon_mode_in, t_canon_mode_out;
	enum s_key_code t_repeat_key;
	unsigned int t_repeat_count;
	enum tty_flags t_flags;
	struct b_tty_vmode t_vmode;
	struct tty_format_buf t_format_buf;
};

static struct b_tty std = {0};
static struct b_tty err = {0};

static WORD ansi_colour16_fg[] = {
	[B_TTY_COLOUR16_BLACK] = 0,
	[B_TTY_COLOUR16_RED] = FOREGROUND_RED,
	[B_TTY_COLOUR16_GREEN] = FOREGROUND_GREEN,
	[B_TTY_COLOUR16_YELLOW] = FOREGROUND_RED | FOREGROUND_GREEN,
	[B_TTY_COLOUR16_BLUE] = FOREGROUND_BLUE,
	[B_TTY_COLOUR16_MAGENTA] = FOREGROUND_RED | FOREGROUND_BLUE,
	[B_TTY_COLOUR16_CYAN] = FOREGROUND_GREEN | FOREGROUND_BLUE,
	[B_TTY_COLOUR16_WHITE] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE,
	[B_TTY_COLOUR16_BRIGHT_BLACK] = FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_RED] = FOREGROUND_RED | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_GREEN] = FOREGROUND_GREEN | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_YELLOW] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_BLUE] = FOREGROUND_BLUE | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_MAGENTA] = FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_CYAN] = FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_WHITE] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY,
};

static WORD ansi_colour16_bg[] = {
	[B_TTY_COLOUR16_BLACK] = 0,
	[B_TTY_COLOUR16_RED] = BACKGROUND_RED,
	[B_TTY_COLOUR16_GREEN] = BACKGROUND_GREEN,
	[B_TTY_COLOUR16_YELLOW] = BACKGROUND_RED | BACKGROUND_GREEN,
	[B_TTY_COLOUR16_BLUE] = BACKGROUND_BLUE,
	[B_TTY_COLOUR16_MAGENTA] = BACKGROUND_RED | BACKGROUND_BLUE,
	[B_TTY_COLOUR16_CYAN] = BACKGROUND_GREEN | BACKGROUND_BLUE,
	[B_TTY_COLOUR16_WHITE] = BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE,
	[B_TTY_COLOUR16_BRIGHT_BLACK] = BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_RED] = BACKGROUND_RED | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_GREEN] = BACKGROUND_GREEN | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_YELLOW] = BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_BLUE] = BACKGROUND_BLUE | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_MAGENTA] = BACKGROUND_RED | BACKGROUND_BLUE | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_CYAN] = BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY,
	[B_TTY_COLOUR16_BRIGHT_WHITE] = BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY,
};

static void init_tty(struct b_tty *tty, FILE *in, FILE *out)
{
	HANDLE in_handle = INVALID_HANDLE_VALUE;
	HANDLE out_handle = INVALID_HANDLE_VALUE;

	if (in) {
		in_handle = (HANDLE)_get_osfhandle(fileno(in));
	}

	if (out) {
		out_handle = (HANDLE)_get_osfhandle(fileno(out));
	}

	tty->t_in = in_handle;
	tty->t_out = out_handle;
	tty->t_flags |= B_TTY_INIT;

	CONSOLE_SCREEN_BUFFER_INFO csbi = {0};
	DWORD mode = 0;

	if (in && GetConsoleScreenBufferInfo(in_handle, &csbi)) {
		GetConsoleMode(in_handle, &mode);
		tty->t_canon_mode_in = mode;
		tty->t_flags |= B_TTY_INTERACTIVE;
	}

	if (out && GetConsoleScreenBufferInfo(out_handle, &csbi)) {
		GetConsoleMode(out_handle, &mode);
		tty->t_canon_mode_out = mode;
		tty->t_flags |= B_TTY_INTERACTIVE;
	}
}

struct b_tty *z__b_tty_get_std(void)
{
	if (!(std.t_flags & B_TTY_INIT)) {
		init_tty(&std, stdin, stdout);
	}

	return &std;
}

struct b_tty *z__b_tty_get_err(void)
{
	if (!(err.t_flags & B_TTY_INIT)) {
		init_tty(&err, NULL, stderr);
	}

	return &err;
}

struct tty_format_buf *z__b_tty_get_format_buf(struct b_tty *tty)
{
	return &tty->t_format_buf;
}

void z__b_tty_putc(struct b_tty* tty, char c)
{
	DWORD x;
	WriteConsoleA(tty->t_out, &c, 1, &x, NULL);
}

bool b_tty_is_interactive(const struct b_tty *tty)
{
	return (tty->t_flags & B_TTY_INTERACTIVE) == B_TTY_INTERACTIVE;
}

static void tty_set_raw(struct b_tty *tty)
{
	DWORD mode = tty->t_canon_mode_in;
	mode &= ~(ENABLE_ECHO_INPUT | ENABLE_INSERT_MODE | ENABLE_LINE_INPUT | ENABLE_QUICK_EDIT_MODE | ENABLE_WINDOW_INPUT);
	mode |= (ENABLE_PROCESSED_INPUT);
	SetConsoleMode(tty->t_in, mode);

	mode = tty->t_canon_mode_out;
	//mode &= ~(ENABLE_PROCESSED_OUTPUT);
	SetConsoleMode(tty->t_out, mode);
}

static void tty_set_canon(struct b_tty *tty)
{
	SetConsoleMode(tty->t_in, tty->t_canon_mode_in);
	SetConsoleMode(tty->t_out, tty->t_canon_mode_out);
}

void b_tty_set_mode(struct b_tty* tty, enum b_tty_mode mode)
{
	switch (mode) {
	case B_TTY_CANONICAL:
		tty_set_canon(tty);
		break;
	case B_TTY_RAW:
		tty_set_raw(tty);
		break;
	default:
		break;
	}
}

void b_tty_reset_vmode(struct b_tty *tty)
{
	if (tty->t_vmode.v_fg.c_mode == B_TTY_COLOUR_NONE
	    && tty->t_vmode.v_bg.c_mode == B_TTY_COLOUR_NONE
	    && tty->t_vmode.v_attrib == B_TTY_ATTRIB_NORMAL) {
		return;
	}

	WORD attrib = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
	SetConsoleTextAttribute(tty->t_out, attrib);

	memset(&tty->t_vmode, 0x0, sizeof tty->t_vmode);

	tty->t_vmode.v_fg.c_mode = B_TTY_COLOUR_NONE;
	tty->t_vmode.v_bg.c_mode = B_TTY_COLOUR_NONE;
	tty->t_vmode.v_attrib = B_TTY_ATTRIB_NORMAL;
}

static int compare_colour(
	const struct b_tty_colour *a, const struct b_tty_colour *b)
{
	if (a->c_mode != b->c_mode) {
		return -1;
	}

	switch (a->c_mode) {
	case B_TTY_COLOUR_16:
		if (a->c_16.value != b->c_16.value) {
			return -1;
		}
		break;
	case B_TTY_COLOUR_256:
		if (a->c_256.value != b->c_256.value) {
			return -1;
		}
		break;
	case B_TTY_COLOUR_TRUE:
		if (a->c_true.r != b->c_true.r) {
			return -1;
		}

		if (a->c_true.g != b->c_true.g) {
			return -1;
		}

		if (a->c_true.b != b->c_true.b) {
			return -1;
		}
		break;
	default:
		break;
	}

	return 0;
}

static int compare_vmode(const struct b_tty_vmode *a, const struct b_tty_vmode *b)
{
	if (a->v_attrib != b->v_attrib) {
		return -1;
	}

	if (compare_colour(&a->v_fg, &b->v_fg) != 0) {
		return -1;
	}

	if (compare_colour(&a->v_bg, &b->v_bg) != 0) {
		return -1;
	}

	return 0;
}

static void set_attrib(WORD *attrp, enum b_tty_attrib old, enum b_tty_attrib new)
{
	if (old == new) {
		return;
	}

	WORD attrib = *attrp;

	/* Bold ON */
	if (!(old & B_TTY_ATTRIB_BOLD) && new & B_TTY_ATTRIB_BOLD) {
		attrib |= FOREGROUND_INTENSITY;
	}

	/* Bold OFF */
	if (old & B_TTY_ATTRIB_BOLD && !(new & B_TTY_ATTRIB_BOLD)) {
		attrib &= ~FOREGROUND_INTENSITY;
	}

	/* Underline ON */
	if (!(old & B_TTY_ATTRIB_UNDERLINE) && new & B_TTY_ATTRIB_UNDERLINE) {
		attrib |= COMMON_LVB_UNDERSCORE;
	}

	/* Underline OFF */
	if (old & B_TTY_ATTRIB_UNDERLINE && !(new & B_TTY_ATTRIB_UNDERLINE)) {
		attrib &= ~COMMON_LVB_UNDERSCORE;
	}

	/* Italic ON */
	if (!(old & B_TTY_ATTRIB_ITALIC) && new & B_TTY_ATTRIB_ITALIC) {
		/* not supported */
	}

	/* Italic OFF */
	if (old & B_TTY_ATTRIB_ITALIC && !(new & B_TTY_ATTRIB_ITALIC)) {
		/* not supported */
	}

	*attrp = attrib;
}

static void set_fg(
	WORD *attrp, const struct b_tty_colour *old,
	const struct b_tty_colour *new)
{
	if (compare_colour(old, new) == 0) {
		return;
	}

	WORD attrib = *attrp;
	attrib &= ~(FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY);

	switch (new->c_mode) {
	case B_TTY_COLOUR_16:
		attrib |= ansi_colour16_fg[new->c_16.value];
		break;
	default:
		attrib |= FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
		break;
	}

	*attrp = attrib;
}

static void set_bg(
	WORD *attrp, const struct b_tty_colour *old,
	const struct b_tty_colour *new)
{
	if (compare_colour(old, new) == 0) {
		return;
	}

	WORD attrib = *attrp;
	attrib &= ~(BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY);

	switch (new->c_mode) {
	case B_TTY_COLOUR_16:
		attrib |= ansi_colour16_bg[new->c_16.value];
		break;
	default:
		attrib |= BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE;
		break;
	}
}

void b_tty_set_vmode(struct b_tty *tty, const struct b_tty_vmode *vmode)
{
	if (compare_vmode(&tty->t_vmode, vmode) == 0) {
		return;
	}

	WORD attrib = 0;

	CONSOLE_SCREEN_BUFFER_INFO csbi = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &csbi);
	
	attrib = csbi.wAttributes;

	set_attrib(&attrib, tty->t_vmode.v_attrib, vmode->v_attrib);
	set_fg(&attrib, &tty->t_vmode.v_fg, &vmode->v_fg);
	set_bg(&attrib, &tty->t_vmode.v_bg, &vmode->v_bg);

	SetConsoleTextAttribute(tty->t_out, attrib);

	memcpy(&tty->t_vmode, vmode, sizeof *vmode);
}

enum b_status b_tty_get_dimensions(struct b_tty* tty, unsigned int* w, unsigned int* h)
{
	if (!(tty->t_flags & B_TTY_INTERACTIVE)) {
		return B_ERR_NOT_SUPPORTED;
	}

	CONSOLE_SCREEN_BUFFER_INFO csbi = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &csbi);

	if (w) {
		*w = csbi.srWindow.Right - csbi.srWindow.Left;
	}

	if (h) {
		*h = csbi.srWindow.Bottom - csbi.srWindow.Top;
	}

	return B_SUCCESS;
}

enum b_status b_tty_get_cursor_position(struct b_tty *tty, unsigned int *x, unsigned int *y)
{
	if (!(tty->t_flags & B_TTY_INTERACTIVE)) {
		return B_ERR_NOT_SUPPORTED;
	}

	CONSOLE_SCREEN_BUFFER_INFO csbi = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &csbi);

	if (x) {
		*x = csbi.dwCursorPosition.X;
	}

	if (y) {
		*y = csbi.dwCursorPosition.Y;
	}

	return B_SUCCESS;
}

b_keycode b_tty_read_key(struct b_tty *tty)
{
	if (tty->t_repeat_count > 0) {
		tty->t_repeat_count--;
		return tty->t_repeat_key;
	}

	INPUT_RECORD d;
	HANDLE in = tty->t_in;
	BOOL status = TRUE;
	CONSOLE_READCONSOLE_CONTROL ctrl = {0};
	DWORD nr_read = 0;

	while (1) {
		status = ReadConsoleInputA(in, &d, 1, &nr_read);
		if (status == FALSE) {
			return B_KEY_EOF;
		}

		if (d.EventType != KEY_EVENT) {
			continue;
		}

		if (!d.Event.KeyEvent.bKeyDown) {
			continue;
		}

		b_keycode key = 0;

		switch (d.Event.KeyEvent.wVirtualKeyCode) {
		case VK_CONTROL:
		case VK_RCONTROL:
		case VK_SHIFT:
		case VK_RSHIFT:
		case VK_MENU:
			continue;
		case VK_UP:
			key = B_KEY_ARROW_UP;
			break;
		case VK_DOWN:
			key = B_KEY_ARROW_DOWN;
			break;
		case VK_LEFT:
			key = B_KEY_ARROW_LEFT;
			break;
		case VK_RIGHT:
			key = B_KEY_ARROW_RIGHT;
			break;
		case VK_BACK:
			key = B_KEY_BACKSPACE;
			break;
		case VK_RETURN:
			key = B_KEY_RETURN;
			break;
		default:
			if (d.Event.KeyEvent.uChar.UnicodeChar == 0) {
				continue;
			}

			key = d.Event.KeyEvent.uChar.AsciiChar;
			break;
		}

		if (d.Event.KeyEvent.dwControlKeyState & LEFT_CTRL_PRESSED) {
			key = B_TTY_CTRL_KEY('a' + key - 1);
		}

		if (d.Event.KeyEvent.wRepeatCount > 1) {
			tty->t_repeat_count = d.Event.KeyEvent.wRepeatCount - 1;
			tty->t_repeat_key = key;
		}

		return key;
	}

	return B_KEY_EOF;
}

void b_tty_move_cursor_x(
	struct b_tty* tty, enum b_tty_position_base base, int pos)
{
	CONSOLE_SCREEN_BUFFER_INFO console = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &console);
	COORD cursor_pos;
	cursor_pos.Y = console.dwCursorPosition.Y;

	switch (base) {
	case B_TTY_POS_CURSOR:
		cursor_pos.X = console.dwCursorPosition.X + pos;
		break;
	case B_TTY_POS_START:
		cursor_pos.X = pos;
		break;
	default:
		break;
	}
		
	SetConsoleCursorPosition(tty->t_out, cursor_pos);
}

void b_tty_move_cursor_y(struct b_tty *tty, enum b_tty_position_base base, int pos)
{
	CONSOLE_SCREEN_BUFFER_INFO console = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &console);
	COORD cursor_pos;
	cursor_pos.X = console.dwCursorPosition.X;

	switch (base) {
	case B_TTY_POS_CURSOR:
		cursor_pos.Y = console.dwCursorPosition.Y + pos;
		break;
	case B_TTY_POS_START:
		cursor_pos.Y = pos;
		break;
	default:
		break;
	}

	SetConsoleCursorPosition(tty->t_out, cursor_pos);
}

void b_tty_clear(struct b_tty *tty, enum b_tty_clear_mode mode)
{
	CONSOLE_SCREEN_BUFFER_INFO console = {0};
	GetConsoleScreenBufferInfo(tty->t_out, &console);

	WCHAR fill = L' ';
	DWORD length = 0;
	COORD start;

	DWORD all_length = 0, line_length = 0;

	if (mode & B_TTY_CLEAR_ALL) {
		line_length = console.dwSize.X;
		all_length = line_length * console.dwSize.Y;
	} else if (mode & B_TTY_CLEAR_FROM_CURSOR) {
		line_length = console.dwSize.X - console.dwCursorPosition.X + 1;
		all_length = line_length + ((console.dwSize.Y - console.dwCursorPosition.Y) * console.dwSize.X);
	} else if (mode & B_TTY_CLEAR_TO_CURSOR) {
		line_length = console.dwCursorPosition.X;
		all_length = line_length
		           + ((console.dwCursorPosition.Y - 1) * console.dwSize.X);
	} else {
		abort();
	}

	if (mode & B_TTY_CLEAR_SCREEN) {
		length = all_length;

		if ((mode & B_TTY_CLEAR_ALL) || (mode & B_TTY_CLEAR_TO_CURSOR)) {
			start.X = 0;
			start.Y = 0;
		} else if (mode & B_TTY_CLEAR_FROM_CURSOR) {
			start = console.dwCursorPosition;
		}
	} else if (mode & B_TTY_CLEAR_LINE) {
		length = line_length;

		if ((mode & B_TTY_CLEAR_ALL) || (mode & B_TTY_CLEAR_TO_CURSOR)) {
			start.X = 0;
			start.Y = console.dwCursorPosition.Y;
		} else if (mode & B_TTY_CLEAR_FROM_CURSOR) {
			start = console.dwCursorPosition;
		}
	} else {
		abort();
	}

	DWORD nr_written = 0;
	FillConsoleOutputCharacterW(tty->t_out, fill, length, start, &nr_written);
}