//---
// aoe: Physical entities tracking areas of effect of skills
//---

#pragma once

#include "geometry.h"
#include "anim.h"
#include "item.h"

enum {
    /* Item */
    AOE_ITEM,
    /* Bare-hand fist/close-contact attack */
    AOE_HIT,
    /* Simple ranged attack */
    AOE_PROJECTILE,
    AOE_PROJECTILE_FAST,
    /* Normal attack by a slashing weapon */
    AOE_SLASH,
    /* Impaling attack using a slashing weapon */
    AOE_IMPALE,
    /* Skills */
    AOE_SHOCK,
    AOE_JUDGEMENT,
    AOE_BULLET,
    AOE_FIRE_CHARGE,
    AOE_WATER_CHARGE,
    AOE_CHEMICAL_CHARGE,
    /* Spawn effect */
    EFFECT_SPAWN,
};

/* Record of when an area hit an entity */
typedef struct
{
    /* Entity hit */
    entity_t *entity;
    /* Lifetime of the area at the time of the hit */
    fixed_t lifetime;

} aoe_record_t;

/* Extra component for areas of effect */
typedef struct
{
    /* Lifetime (s) */
    fixed_t lifetime;
    /* Effect repeat delay (seconds; 0 for no repeat) */
    fixed_t repeat_delay;
    /* List of entities that were hit */
    aoe_record_t *hits;
    int hit_count;
    /* Entity that caused the area */
    entity_t *origin;
    /* Type of effect */
    uint16_t type;
    /* Effect data (type-dependent) */
    union {
        /* Item: item info */
        struct { int type; } item;
        /* Generic attacks: source and ATK strength */
        struct { int strength; int dir; } generic;
        /* AOE_PROJECTILE, AOE_PROJECTILE_FAST: speed and direction */
        struct { int strength; vec2 direction; fixed_t speed; } projectile;
        /* AOE_SHOCK: origin and ATK strength */
        struct { int strength; vec2 origin; } shock;
        /* AOE_BULLET: magic strengh, speed parameters */
        struct { int strength; int dir; fixed_t v; fixed_t final_v; } bullet;
        /* AOE_*_CHARGE: element type, origin and MAG power */
        struct { int element; int power; vec2 origin; } charge;
    } data;

} aoe_t;

/* Create a new area of the specified type. The animation, repeat delay, origin
   and type-specific data should be set manually after creation. */
entity_t *aoe_make(uint16_t type, vec2 position, fixed_t lifetime);

/* Free resources for an area. */
void aoe_destroy(entity_t *aoe);

/* Create an area for a particular attack; all attributes are initialized. */
entity_t *aoe_make_attack(uint16_t type, entity_t *origin, vec2 dir);
entity_t *aoe_make_attack_4(uint16_t type, entity_t *origin, int facing);

/* Apply effect of area on entity */
struct game;
void aoe_apply(struct game *g, entity_t *aoe, entity_t *e);

/* Regular update, for moving areas (eg. bullet) */
void aoe_update(struct game *g, entity_t *aoe, fixed_t dt);