//-----------------------------------------------------------------------------
// Sprite_Weapon
//
// The sprite for displaying a weapon image for attacking.
/**
 * The sprite for displaying a weapon image for attacking.
 *
 * @class
 * @extends Sprite
 */
function Sprite_Weapon() {
    this.initialize(...arguments);
}

Sprite_Weapon.prototype = Object.create(Sprite.prototype);
Sprite_Weapon.prototype.constructor = Sprite_Weapon;

Sprite_Weapon.prototype.initialize = function() {
    Sprite.prototype.initialize.call(this);
    this.initMembers();
};

/**
 * Initialize the sprite's variables
 */
Sprite_Weapon.prototype.initMembers = function() {
    this._weaponImageId = 0;
    this._animationCount = 0;
    this._pattern = 0;
    this.anchor.x = 0.5;
    this.anchor.y = 1;
    this.x = -16;
};

/**
 * Sets the sprite up
 *
 * @param {number} weaponImageId - The id of the weapon image to use for the sprite
 */
Sprite_Weapon.prototype.setup = function(weaponImageId) {
    this._weaponImageId = weaponImageId;
    this._animationCount = 0;
    this._pattern = 0;
    this.loadBitmap();
    this.updateFrame();
};

Sprite_Weapon.prototype.update = function() {
    Sprite.prototype.update.call(this);
    this._animationCount++;
    if (this._animationCount >= this.animationWait()) {
        this.updatePattern();
        this.updateFrame();
        this._animationCount = 0;
    }
};

/**
 * The time for animation to wait
 *
 * @return {number} Animation wait time
 */
Sprite_Weapon.prototype.animationWait = function() {
    return 12;
};

/**
 * Updates the sprite's pattern
 */
Sprite_Weapon.prototype.updatePattern = function() {
    this._pattern++;
    if (this._pattern >= 3) {
        this._weaponImageId = 0;
    }
};

/**
 * Loads the sprite's bitmap
 */
Sprite_Weapon.prototype.loadBitmap = function() {
    const pageId = Math.floor((this._weaponImageId - 1) / 12) + 1;
    if (pageId >= 1) {
        this.bitmap = ImageManager.loadSystem("Weapons" + pageId);
    } else {
        this.bitmap = ImageManager.loadSystem("");
    }
};

/**
 * Updates the sprite's frame
 */
Sprite_Weapon.prototype.updateFrame = function() {
    if (this._weaponImageId > 0) {
        const index = (this._weaponImageId - 1) % 12;
        const w = 96;
        const h = 64;
        const sx = (Math.floor(index / 6) * 3 + this._pattern) * w;
        const sy = Math.floor(index % 6) * h;
        this.setFrame(sx, sy, w, h);
    } else {
        this.setFrame(0, 0, 0, 0);
    }
};

/**
 * Check if the sprite is playing
 *
 * @return {boolean} True if the sprite is playing
 */
Sprite_Weapon.prototype.isPlaying = function() {
    return this._weaponImageId > 0;
};