/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2017 - Daniel De Matteis
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INPUT_OVERLAY_H__
#define INPUT_OVERLAY_H__

#include <stdint.h>
#include <boolean.h>

#include <retro_common_api.h>
#include <retro_miscellaneous.h>
#include <formats/image.h>

RETRO_BEGIN_DECLS

#define BOX_RADIAL       0x18df06d2U
#define BOX_RECT         0x7c9d4d93U

#define KEY_ANALOG_LEFT  0x56b92e81U
#define KEY_ANALOG_RIGHT 0x2e4dc654U

/* Overlay driver acts as a medium between input drivers 
 * and video driver.
 *
 * Coordinates are fetched from input driver, and an 
 * overlay with pressable actions are displayed on-screen.
 *
 * This interface requires that the video driver has support 
 * for the overlay interface.
 */

typedef struct video_overlay_interface
{
   void (*enable)(void *data, bool state);
   bool (*load)(void *data,
         const void *images, unsigned num_images);
   void (*tex_geom)(void *data, unsigned image,
         float x, float y, float w, float h);
   void (*vertex_geom)(void *data, unsigned image,
         float x, float y, float w, float h);
   void (*full_screen)(void *data, bool enable);
   void (*set_alpha)(void *data, unsigned image, float mod);
} video_overlay_interface_t;

enum overlay_hitbox
{
   OVERLAY_HITBOX_RADIAL = 0,
   OVERLAY_HITBOX_RECT
};

enum overlay_type
{
   OVERLAY_TYPE_BUTTONS = 0,
   OVERLAY_TYPE_ANALOG_LEFT,
   OVERLAY_TYPE_ANALOG_RIGHT,
   OVERLAY_TYPE_KEYBOARD
};

enum overlay_status
{
   OVERLAY_STATUS_NONE = 0,
   OVERLAY_STATUS_DEFERRED_LOAD,
   OVERLAY_STATUS_DEFERRED_LOADING_IMAGE,
   OVERLAY_STATUS_DEFERRED_LOADING_IMAGE_PROCESS,
   OVERLAY_STATUS_DEFERRED_LOADING,
   OVERLAY_STATUS_DEFERRED_LOADING_RESOLVE,
   OVERLAY_STATUS_DEFERRED_DONE,
   OVERLAY_STATUS_DEFERRED_ERROR
};

enum overlay_image_transfer_status
{
   OVERLAY_IMAGE_TRANSFER_NONE = 0,
   OVERLAY_IMAGE_TRANSFER_BUSY,
   OVERLAY_IMAGE_TRANSFER_DONE,
   OVERLAY_IMAGE_TRANSFER_DESC_IMAGE_ITERATE,
   OVERLAY_IMAGE_TRANSFER_DESC_ITERATE,
   OVERLAY_IMAGE_TRANSFER_DESC_DONE,
   OVERLAY_IMAGE_TRANSFER_ERROR
};

struct overlay
{
   unsigned id;

   struct overlay_desc *descs;
   size_t size;
   size_t pos;
   unsigned pos_increment;

   struct texture_image image;

   bool block_scale;
   float mod_x, mod_y, mod_w, mod_h;
   float x, y, w, h;
   float scale;
   float center_x, center_y;

   bool full_screen;

   char name[64];

   struct
   {
      struct
      {
         char key[64];
         char path[PATH_MAX_LENGTH];
      } paths;

      struct
      {
         char key[64];
      } names;

      struct
      {
         char array[256];
         char key[64];
      } rect;

      struct
      {
         char key[64];
         unsigned size;
      } descs;

      bool normalized;
      float alpha_mod;
      float range_mod;
   } config;

   struct texture_image *load_images;
   unsigned load_images_size;
};

struct overlay_desc
{
   float x;
   float y;

   enum overlay_hitbox hitbox;
   float range_x, range_y;
   float range_x_mod, range_y_mod;
   float mod_x, mod_y, mod_w, mod_h;
   float delta_x, delta_y;

   enum overlay_type type;
   uint64_t key_mask;
   float analog_saturate_pct;

   unsigned next_index;
   char next_index_name[64];

   struct texture_image image;
   unsigned image_index;

   float alpha_mod;
   float range_mod;

   bool updated;
   bool movable;
};

typedef struct overlay_desc overlay_desc_t;

typedef struct input_overlay input_overlay_t;

typedef struct
{
    struct overlay *overlays;
    struct overlay *active;
    size_t size;
    bool hide_in_menu;
    bool overlay_enable;
    float overlay_opacity;
    float overlay_scale;
} overlay_task_data_t;

/**
 * input_overlay_free:
 *
 * Frees overlay handle.
 **/
void input_overlay_free(input_overlay_t *ol);

void input_overlay_free_overlay(struct overlay *overlay);

/**
 * input_overlay_init
 *
 * Initializes the overlay system.
 */
void input_overlay_init(void);
/**
 * input_overlay_set_alpha_mod:
 * @mod                   : New modulating factor to apply.
 *
 * Sets a modulating factor for alpha channel. Default is 1.0.
 * The alpha factor is applied for all overlays.
 **/
void input_overlay_set_alpha_mod(input_overlay_t *ol, float mod);

/**
 * input_overlay_set_scale_factor:
 * @scale                 : Factor of scale to apply.
 *
 * Scales the overlay by a factor of scale.
 **/
void input_overlay_set_scale_factor(input_overlay_t *ol, float scale);

/**
 * input_overlay_next:
 *
 * Switch to the next available overlay
 * screen.
 **/
void input_overlay_next(input_overlay_t *ol, float opacity);

/*
 * input_poll_overlay:
 * @ol : pointer to overlay 
 *
 * Poll pressed buttons/keys on currently active overlay.
 **/
void input_poll_overlay(input_overlay_t *ol, float opacity, unsigned analog_dpad_mode,
      float axis_threshold);

void input_state_overlay(input_overlay_t *ol,
      int16_t *ret, unsigned port, unsigned device, unsigned idx,
      unsigned id);

bool input_overlay_key_pressed(input_overlay_t *ol, int key);

bool input_overlay_is_alive(input_overlay_t *ol);

void input_overlay_loaded(void *task_data, void *user_data, const char *err);

/* FIXME - temporary. Globals are bad */
extern input_overlay_t *overlay_ptr;

RETRO_END_DECLS

#endif