#include "line-editor.h"

void line_ed_hide(struct bshell_line_ed_p *ed)
{
	if (!ed->ed_render.r_vlines) {
		return;
	}

#if 0
	fprintf(stderr, "--- hide ---\n");
	fprintf(stderr,
	        "vlines=%lu, cursor=%lu->(%ld,%ld)\n",
	        ed->ed_render.r_vlines,
	        ed->ed_cursor,
	        ed->ed_render.ed_points.c_cursor_x,
	        ed->ed_render.ed_points.c_cursor_y);
#endif

	if (ed->ed_render.ed_points.c_cursor_y > 0) {
		fx_tty_move_cursor_y(
			ed->ed_tty,
			FX_TTY_POS_CURSOR,
			-ed->ed_render.ed_points.c_cursor_y);
	}
	fx_tty_move_cursor_x(ed->ed_tty, FX_TTY_POS_START, 0);
	fx_tty_clear(
		ed->ed_tty,
		FX_TTY_CLEAR_SCREEN | FX_TTY_CLEAR_FROM_CURSOR);
	memset(&ed->ed_render, 0x0, sizeof ed->ed_render);
}

static void render_prompt(struct bshell_line_ed_p *ed)
{
	if (ed->ed_render_prompt) {
		bshell_line_ed_plugin_class *renderer = fx_object_get_interface(
			ed->ed_render_prompt,
			BSHELL_TYPE_LINE_EDITOR_PLUGIN);
		renderer->p_render_prompt(ed->ed_render_prompt, ed->ed_self);
	}
}

static void render_buffer(struct bshell_line_ed_p *ed)
{
	if (ed->ed_render_buffer) {
		bshell_line_ed_plugin_class *renderer = fx_object_get_interface(
			ed->ed_render_buffer,
			BSHELL_TYPE_LINE_EDITOR_PLUGIN);
		renderer->p_render_buffer(ed->ed_render_buffer, ed->ed_self);
	}
}

void line_ed_show(struct bshell_line_ed_p *ed)
{
	render_prompt(ed);
	render_buffer(ed);
	line_ed_get_points(ed, &ed->ed_render.ed_points);
	bool cursor_limit_newline
		= ed->ed_render.ed_points.c_cursor_limit_x == 0
	       && ed->ed_render.ed_points.c_cursor_limit_y > 0;
	if (cursor_limit_newline) {
		fx_tty_putc(ed->ed_tty, 0, '\r');
		fx_tty_putc(ed->ed_tty, 0, '\n');
	}

	long shift_x = 0, shift_y = 0;
	shift_x = (long)ed->ed_render.ed_points.c_cursor_x
	        - (long)ed->ed_render.ed_points.c_cursor_limit_x;
	shift_y = (long)ed->ed_render.ed_points.c_cursor_y
	        - (long)ed->ed_render.ed_points.c_cursor_limit_y;

	fx_tty_move_cursor_x(ed->ed_tty, FX_TTY_POS_CURSOR, shift_x);
	fx_tty_move_cursor_y(ed->ed_tty, FX_TTY_POS_CURSOR, shift_y);

#if 0
	fprintf(stderr, "--- show ---\n");
	fprintf(stderr,
	        "cursor=%lu->(%lu,%lu)\n",
	        ed->ed_cursor,
	        ed->ed_render.ed_points.c_cursor_x,
	        ed->ed_render.ed_points.c_cursor_y);
	fprintf(stderr,
	        "cursor_limit=(%lu,%lu)\n",
	        ed->ed_render.ed_points.c_cursor_limit_x,
	        ed->ed_render.ed_points.c_cursor_limit_y);
	fprintf(stderr,
	        "render_limit=(%lu,%lu)\n",
	        ed->ed_render.ed_points.c_render_limit_x,
	        ed->ed_render.ed_points.c_render_limit_y);
#endif

	ed->ed_render.r_vlines = ed->ed_render.ed_points.c_render_limit_y + 1;
}

int line_ed_get_char_width(fx_wchar c)
{
	/* TODO support double-width and zero-width characters */
	return fx_wchar_is_graph(c) ? 1 : 0;
}