//---
// anim: Renderer's animations
//
// Animations in this engine are simply linked variants of sprites. Animated
// images change over time, moving from frame to frame, and that's it.
//---

#pragma once

#include <stdint.h>
#include "fixed.h"

#include <gint/display.h>

typedef struct anim_frame
{
	/* Sheet */
	bopti_image_t const *sheet;
	/* Box for the frame within the sheet */
	uint8_t x, y, w, h;
	/* Position of center for this frame */
	int8_t cx, cy;
	/* Duration of the frame (ms) */
	uint16_t duration;
	/* Next frame */
	struct anim_frame *next;

} anim_frame_t;

typedef struct
{
	/* Number of directions
	   1: Basic sprite
	   2: LEFT and RIGHT (enemies)
	   4: UP, RIGHT, DOWN and LEFT (player, some attacks) */
	int directions;
	/* First frame for each direction */
	anim_frame_t *start[];

} anim_t;

typedef struct
{
	/* Current frame */
	anim_frame_t const *frame;
	/* Time elapsed */
	uint16_t elapsed;

} anim_state_t;

/* Duration of an animation, in seconds; assumed unique for all directions */
fixed_t anim_duration(anim_t const *anim);

/* Check if a frame is in an animation. */
bool anim_in(anim_frame_t const *frame, anim_t const *anim, int index);

/* Render a frame at the center position (x,y), similar to dimage(). */
void anim_frame_render(int x, int y, anim_frame_t const *frame);

/* Render a subimage of a frame, similar to dsubimage(). */
void anim_frame_subrender(int x, int y, anim_frame_t const *frame, int left,
    int top, int width, int height);

/* Update an animation to next frame. */
void anim_state_update(anim_state_t *state, fixed_t dt);

/* List of animations. */

/* Basic skills */
extern anim_t anims_skill_hit;
extern anim_t anims_skill_projectile;
extern anim_t anims_skill_teleport;
extern anim_t anims_skill_shock;
extern anim_t anims_skill_judgement;
/* Directional skills */
extern anim_t anims_skill_swing;
extern anim_t anims_skill_impale;
extern anim_t anims_skill_bullet;

/* Enemies */

#define ANIM_ENEMIES(MACRO) \
	ANIM_E1(MACRO, slime, Idle, Walking, Attack, Fire, Hit, Death) \
	ANIM_E1(MACRO, fire_slime, Idle, Walking, Attack, Fire, Hit, Death) \
	ANIM_E1(MACRO, water_slime, Idle, Walking, Attack, Fire, Hit, Death) \
	ANIM_E1(MACRO, chemical_slime, Idle, Walking, Attack, Fire, Hit, Death) \
	ANIM_E1(MACRO, bat, Idle, Hit, Death) \
	ANIM_E1(MACRO, albinos_bat, Idle, Hit, Death) \
	ANIM_E1(MACRO, crimson_bat, Idle, Hit, Death) \
	ANIM_E1(MACRO, gunslinger, Idle, Walking, Reloading, Fire, Hit, Death) \
	ANIM_E1(MACRO, gb_gunslinger, Idle, Walking, Reloading, Fire, Hit, Death) \
	ANIM_E1(MACRO, master_gunslinger, Idle, Walking,Reloading,Fire,Hit,Death) \
	ANIM_E1(MACRO, tifucile, Idle, Walking, Hit, Death) \
	ANIM_E1(MACRO, washing_machine, Idle, Walking, Attack, Hit, Death)

/* Player */
extern anim_t anims_player_Idle;
extern anim_t anims_player_Walking;
extern anim_t anims_player_Attack;
extern anim_t anims_player_Hit;

/* HUD */
extern anim_t anims_hud_xp_Idle;
extern anim_t anims_hud_xp_Shine;
extern anim_t anims_hud_xp_Explode;

/* Items */
extern anim_t anims_item_life;
extern anim_t anims_item_chest;
extern anim_t anims_item_potion_atk;
extern anim_t anims_item_potion_cooldown;
extern anim_t anims_item_potion_def;
extern anim_t anims_item_potion_frz;
extern anim_t anims_item_potion_hp;
extern anim_t anims_item_potion_spd;
extern anim_t anims_item_stick1;
extern anim_t anims_item_stick2;
extern anim_t anims_item_sword1;
extern anim_t anims_item_sword2;
extern anim_t anims_item_armor1;

/* Expand definitions for enemies */

#define ANIM_E1(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_E2(MACRO, ENEMY, __VA_ARGS__))
#define ANIM_E2(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_E3(MACRO, ENEMY, __VA_ARGS__))
#define ANIM_E3(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_E4(MACRO, ENEMY, __VA_ARGS__))
#define ANIM_E4(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_E5(MACRO, ENEMY, __VA_ARGS__))
#define ANIM_E5(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_E6(MACRO, ENEMY, __VA_ARGS__))
#define ANIM_E6(MACRO, ENEMY, SEQ, ...) \
	MACRO(ENEMY, SEQ) __VA_OPT__(ANIM_ETOO_MANY_ARGS)

#define ANIM_ENEMIES_PROTO(ENEMY, SEQ) \
	extern anim_t anims_ ## ENEMY ## _ ## SEQ;
ANIM_ENEMIES(ANIM_ENEMIES_PROTO)