import {Validator, ValidatorResult} from 'jsonschema';
import {ecSignatureSchema, ecSignatureParameter} from '../schemas/ec_signature_schema';
import {orderSchema, signedOrderSchema} from '../schemas/order_schemas';
import {addressSchema, numberSchema} from '../schemas/basic_type_schemas';
import {tokenSchema} from '../schemas/token_schema';
import {orderFillOrKillRequestsSchema} from '../schemas/order_fill_or_kill_requests_schema';

export class SchemaValidator {
    private validator: Validator;
    // In order to validate a complex JS object using jsonschema, we must replace any complex
    // sub-types (e.g BigNumber) with a simpler string representation. Since BigNumber and other
    // complex types implement the `toString` method, we can stringify the object and
    // then parse it. The resultant object can then be checked using jsonschema.
    static convertToJSONSchemaCompatibleObject(obj: any): any {
        return JSON.parse(JSON.stringify(obj));
    }
    constructor() {
        this.validator = new Validator();
        this.validator.addSchema(tokenSchema, tokenSchema.id);
        this.validator.addSchema(orderSchema, orderSchema.id);
        this.validator.addSchema(numberSchema, numberSchema.id);
        this.validator.addSchema(addressSchema, addressSchema.id);
        this.validator.addSchema(ecSignatureSchema, ecSignatureSchema.id);
        this.validator.addSchema(signedOrderSchema, signedOrderSchema.id);
        this.validator.addSchema(ecSignatureParameter, ecSignatureParameter.id);
        this.validator.addSchema(orderFillOrKillRequestsSchema, orderFillOrKillRequestsSchema.id);
    }
    public validate(instance: any, schema: Schema): ValidatorResult {
        const jsonSchemaCompatibleObject = SchemaValidator.convertToJSONSchemaCompatibleObject(instance);
        return this.validator.validate(jsonSchemaCompatibleObject, schema);
    }
}