//-----------------------------------------------------------------------------
// Window_ShopBuy
//
// The window for selecting an item to buy on the shop screen.
/**
 * The window for selecting an item to buy on the shop screen.
 *
 * @class
 * @extends Window_Selectable
 */
function Window_ShopBuy() {
    this.initialize(...arguments);
}

Window_ShopBuy.prototype = Object.create(Window_Selectable.prototype);
Window_ShopBuy.prototype.constructor = Window_ShopBuy;

Window_ShopBuy.prototype.initialize = function(rect) {
    Window_Selectable.prototype.initialize.call(this, rect);
    this._money = 0;
};

/**
 * Set up the window
 *
 * @param {Array} shopGoods - An array of shop goods
 */
Window_ShopBuy.prototype.setupGoods = function(shopGoods) {
    this._shopGoods = shopGoods;
    this.refresh();
    this.select(0);
};

/**
 * Get the maximum amount of items to display in the window
 *
 * @return {number} Amount of items to display in the window
 */
Window_ShopBuy.prototype.maxItems = function() {
    return this._data ? this._data.length : 1;
};

/**
 * Get the currently selected item
 *
 * @return {Object} The item currently selected
 */
Window_ShopBuy.prototype.item = function() {
    return this.itemAt(this.index());
};

/**
 * Get the item object at the given index
 *
 * @param {number} index - The index of the item
 * @return {Object} The item at the given index
 */
Window_ShopBuy.prototype.itemAt = function(index) {
    return this._data && index >= 0 ? this._data[index] : null;
};

/**
 * Set the amount of money
 *
 * @param {number} money - The amount of money
 */
Window_ShopBuy.prototype.setMoney = function(money) {
    this._money = money;
    this.refresh();
};

/**
 * Check if the currently selected item is enabled
 *
 * @return {boolean} True if enabled
 */
Window_ShopBuy.prototype.isCurrentItemEnabled = function() {
    return this.isEnabled(this._data[this.index()]);
};

/**
 * Get the price of the given item
 *
 * @param {Object} item - The item to check the price of
 * @return {number} The price
 */
Window_ShopBuy.prototype.price = function(item) {
    return this._price[this._data.indexOf(item)] || 0;
};

/**
 * Check if the given item is enabled
 *
 * @param {Object} item - The item to check
 * @return {boolean} True if enabled
 */
Window_ShopBuy.prototype.isEnabled = function(item) {
    return (
        item && this.price(item) <= this._money && !$gameParty.hasMaxItems(item)
    );
};

Window_ShopBuy.prototype.refresh = function() {
    this.makeItemList();
    Window_Selectable.prototype.refresh.call(this);
};

/**
 * Make the list of items in the shop
 */
Window_ShopBuy.prototype.makeItemList = function() {
    this._data = [];
    this._price = [];
    for (const goods of this._shopGoods) {
        const item = this.goodsToItem(goods);
        if (item) {
            this._data.push(item);
            this._price.push(goods[2] === 0 ? item.price : goods[3]);
        }
    }
};

/**
 * Convert a shopGoods array item to the actual item object
 *
 * @param {Array} goods - The shop goods array item
 * @return {Object|null} The item object, or null if not a valid good
 */
Window_ShopBuy.prototype.goodsToItem = function(goods) {
    switch (goods[0]) {
        case 0:
            return $dataItems[goods[1]];
        case 1:
            return $dataWeapons[goods[1]];
        case 2:
            return $dataArmors[goods[1]];
        default:
            return null;
    }
};

/**
 * Draws the item at the given index
 *
 * @param {number} index - The index to draw
 */
Window_ShopBuy.prototype.drawItem = function(index) {
    const item = this.itemAt(index);
    const price = this.price(item);
    const rect = this.itemLineRect(index);
    const priceWidth = this.priceWidth();
    const priceX = rect.x + rect.width - priceWidth;
    const nameWidth = rect.width - priceWidth;
    this.changePaintOpacity(this.isEnabled(item));
    this.drawItemName(item, rect.x, rect.y, nameWidth);
    this.drawText(price, priceX, rect.y, priceWidth, "right");
    this.changePaintOpacity(true);
};

/**
 * Get the width of the price area
 *
 * @return {number} The width of the price area
 */
Window_ShopBuy.prototype.priceWidth = function() {
    return 96;
};

/**
 * Set the status window
 *
 * @param {Window_ShopStatus} statusWindow - The status window
 */
Window_ShopBuy.prototype.setStatusWindow = function(statusWindow) {
    this._statusWindow = statusWindow;
    this.callUpdateHelp();
};

/**
 * Update helper windows
 */
Window_ShopBuy.prototype.updateHelp = function() {
    this.setHelpWindowItem(this.item());
    if (this._statusWindow) {
        this._statusWindow.setItem(this.item());
    }
};