import BN from 'bn.js';

import { IMatchableOrder } from './IMatchableOrder';
import { IMatchableProduct } from './IMatchableProduct';
import { OrderSide } from './OrderSide';

export class Order<TProduct, TProductFilter> implements IMatchableOrder<TProduct, TProductFilter> {
    protected _volume: BN;

    public get volume() {
        return this._volume;
    }

    public get isFilled() {
        return this.volume.isZero();
    }

    constructor(
        public readonly id: string,
        public readonly side: OrderSide,
        public readonly validFrom: Date,
        protected readonly matchableProduct: IMatchableProduct<TProduct, TProductFilter>,
        public readonly price: number,
        volume: BN,
        public readonly userId: string,
        public readonly createdAt: Date,
        public readonly assetId?: string
    ) {
        if (volume.isZero() || volume.isNeg()) {
            throw new Error('Incorrect negative volume');
        }
        if (price <= 0) {
            throw new Error('Incorrect negative price');
        }

        this._volume = new BN(volume);
    }

    public updateWithTradedVolume(tradedVolume: BN) {
        if (tradedVolume.gt(this.volume)) {
            throw new Error('Order overmatched');
        }
        this._volume = this._volume.sub(tradedVolume);

        return this;
    }

    public filterBy(productFilter: TProductFilter): boolean {
        return this.matchableProduct.filter(productFilter);
    }

    public matches(order: IMatchableOrder<TProduct, TProductFilter>): boolean {
        return this.matchableProduct.matches(order.product);
    }

    public clone(): Order<TProduct, TProductFilter> {
        return new Order(
            this.id,
            this.side,
            this.validFrom,
            this.matchableProduct,
            this.price,
            this.volume,
            this.userId,
            this.createdAt,
            this.assetId
        );
    }

    public get product(): TProduct {
        return this.matchableProduct.product;
    }
}