#ifndef _LINE_EDITOR_H_
#define _LINE_EDITOR_H_

#include <bshell/line-editor/line-editor.h>
#include <bshell/line-source.h>
#include <fx/collections/array.h>
#include <fx/collections/hashtable.h>
#include <fx/term/tty.h>

enum line_ed_flags {
	LINE_ED_DONE = 0x01u,
	LINE_ED_EOF = 0x02u,
};

struct cursor_points {
	/* visual co-ordinates of the current cursor position */
	unsigned long c_cursor_x, c_cursor_y;
	/* visual co-ordinates of the last character in the rendered prompt
	 * string */
	unsigned long c_render_limit_x, c_render_limit_y;
	/* visual co-ordinates of the last cell that could be occupied by the
	 * cursor in the rendered prompt string */
	unsigned long c_cursor_limit_x, c_cursor_limit_y;
};

struct line_render {
	/* how many visual terminal rows are being used to display the current
	 * buffer. may be greater than the number of lines in ed_buffer if one
	 * or more of the lines exceeds the width of the terminal. will be
	 * less than or equal to the terminal height. */
	unsigned long r_vlines;
	/* the logical offset that the cursor was at when the prompt was
	 * rendered */
	unsigned long r_cursor;
	/* points of interest */
	struct cursor_points ed_points;
};

struct data_cache {
	fx_string *c_prompt;
	fx_string *c_buffer;
};

struct bshell_line_ed_p {
	bshell_line_ed *ed_self;
	enum line_ed_flags ed_flags;
	struct bshell_line_source ed_linesrc;
	fx_bst ed_keymap;
	fx_array *ed_plugins;
	fx_tty *ed_tty;

	struct data_cache ed_cache;

	bshell_line_ed_plugin *ed_render_prompt;
	bshell_line_ed_plugin *ed_render_buffer;
	bshell_line_ed_plugin *ed_data;

	struct line_render ed_render;
};

extern void line_ed_handle_key(struct bshell_line_ed_p *ed, fx_keycode code);

extern void line_ed_get_points(
	struct bshell_line_ed_p *ed,
	struct cursor_points *out);

extern void line_ed_hide(struct bshell_line_ed_p *ed);
extern void line_ed_show(struct bshell_line_ed_p *ed);

extern fx_string *line_ed_get_prompt(struct bshell_line_ed_p *ed);
extern fx_string *line_ed_get_buffer(struct bshell_line_ed_p *ed);
extern unsigned long line_ed_get_cursor(const struct bshell_line_ed_p *ed);

extern int line_ed_get_char_width(fx_wchar c);

#endif