/* SPDX-License-Identifier: BSD-2-Clause */

/* Copyright (C) 2022-2026 Mintsuki and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FLANTERM_PRIVATE_H
#define FLANTERM_PRIVATE_H 1

#ifndef FLANTERM_IN_FLANTERM
#error "Do not use flanterm_private.h. Use interfaces defined in flanterm.h only."
#endif

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define FLANTERM_MAX_ESC_VALUES 16

struct flanterm_context {
  /* internal use */

  size_t tab_size;
  bool autoflush;
  bool cursor_enabled;
  bool scroll_enabled;
  bool wrap_enabled;
  bool origin_mode;
  bool control_sequence;
  bool escape;
  bool osc;
  bool osc_escape;
  size_t osc_buf_i;
  uint8_t osc_buf[256];
  bool rrr;
  bool discard_next;
  bool bold;
  bool bg_bold;
  bool reverse_video;
  bool dec_private;
  bool insert_mode;
  bool csi_unhandled;
  uint64_t code_point;
  size_t unicode_remaining;
  uint8_t g_select;
  uint8_t charsets[2];
  size_t current_charset;
  size_t escape_offset;
  size_t esc_values_i;
  size_t saved_cursor_x;
  size_t saved_cursor_y;
  size_t current_primary;
  size_t current_bg;
  size_t scroll_top_margin;
  size_t scroll_bottom_margin;
  uint32_t esc_values[FLANTERM_MAX_ESC_VALUES];
  uint8_t last_printed_char;
  bool last_was_graphic;
  bool saved_state_bold;
  bool saved_state_bg_bold;
  bool saved_state_reverse_video;
  bool saved_state_origin_mode;
  bool saved_state_wrap_enabled;
  size_t saved_state_current_charset;
  uint8_t saved_state_charsets[2];
  size_t saved_state_current_primary;
  size_t saved_state_current_bg;

  /* to be set by backend */

  size_t rows, cols;

  void (*raw_putchar) (struct flanterm_context*, uint8_t c);
  void (*clear) (struct flanterm_context*, bool move);
  void (*set_cursor_pos) (struct flanterm_context*, size_t x, size_t y);
  void (*get_cursor_pos) (struct flanterm_context*, size_t* x, size_t* y);
  void (*set_text_fg) (struct flanterm_context*, size_t fg);
  void (*set_text_bg) (struct flanterm_context*, size_t bg);
  void (*set_text_fg_bright) (struct flanterm_context*, size_t fg);
  void (*set_text_bg_bright) (struct flanterm_context*, size_t bg);
  void (*set_text_fg_rgb) (struct flanterm_context*, uint32_t fg);
  void (*set_text_bg_rgb) (struct flanterm_context*, uint32_t bg);
  void (*set_text_fg_default) (struct flanterm_context*);
  void (*set_text_bg_default) (struct flanterm_context*);
  void (*set_text_fg_default_bright) (struct flanterm_context*);
  void (*set_text_bg_default_bright) (struct flanterm_context*);
  void (*move_character) (struct flanterm_context*, size_t new_x, size_t new_y, size_t old_x,
                          size_t old_y);
  void (*scroll) (struct flanterm_context*);
  void (*revscroll) (struct flanterm_context*);
  void (*swap_palette) (struct flanterm_context*);
  void (*save_state) (struct flanterm_context*);
  void (*restore_state) (struct flanterm_context*);
  void (*double_buffer_flush) (struct flanterm_context*);
  void (*full_refresh) (struct flanterm_context*);
  void (*deinit) (struct flanterm_context*, void (*) (void*, size_t));

  /* to be set by client */

  void (*callback) (struct flanterm_context*, uint64_t, uint64_t, uint64_t, uint64_t);
};

void flanterm_context_reinit (struct flanterm_context* ctx);

#ifdef __cplusplus
}
#endif

#endif