import { ECHO_BACK_URL } from "./env/shared";

const visitConf = {
    onBeforeLoad: (cw: any) => {
        cw.XMLHttpRequest.prototype.open = getNewXhrOpen(cw.XMLHttpRequest.prototype.open)
        cw.XMLHttpRequest.prototype.send = getNewSender(cw.XMLHttpRequest.prototype.send);
    }
}

const getNewSender = (oldSend: any) => function(this: any, body: any) {
    // get the body mapper or an identity fn
    const newBody = (this.bodyMappers as any[])
        .map(m => m(body))
        .filter(doesBodyMatch)
        .map(stringify)
        .pop();

    return oldSend.bind(this)(
    newBody || body
    );
}

const getNewXhrOpen = (oldOpen: any) => function(this: any, method: any, url: any) {
    this.bodyMappers = (cy.routeBodyMatchers || [])
        .map(matcher => matcher(method, url))
        .filter(Boolean);

    return oldOpen.bind(this)(
        method,
        this.bodyMappers.length ? ECHO_BACK_URL : url,
        true
    );
}

const doesBodyMatch = (res: any) => res !== '__NO_MATCH__';
const stringify = (v: any) => JSON.stringify(v);
const parseOrValue = (v: any) => {
    try {
        return JSON.parse(v);
    } catch (e) {
        return v;
    }
}
const safeFn = (fn: ((...args: any[]) => any)) => (...args: any[]): any => {
    try { return fn(...args); } catch (e) { }
}

const improvedRouterCommandHandler = (method: string, url: string, tester: (body:any) => boolean, response: any, ...responses: any[]) => {
    let allResponses = [response, ...responses];

    tester = safeFn(tester);

    // make a mapper to determine if we should replace the body
    let routeToBodyMapper = (method2: string, fullUrl: string) => {
        if (method2.toUpperCase() !== method.toUpperCase()) {
            return false;
        }

        if (!fullUrl.match(new RegExp(url.split('**').join('.+?'), 'i'))) {
            return false;
        }

        // this __NO_MATCH__ is so that the user can force false or undefined or whatever they want though
        return (body: any) => !allResponses.length || !tester(parseOrValue(body)) ? '__NO_MATCH__' : allResponses.shift();
    }

    // registerUrlBodyMatch(method, url, tester, response);
    cy.routeBodyMatchers = (cy.routeBodyMatchers || []).concat(routeToBodyMapper);
}

Cypress.Commands.overwrite('visit', (orig, ...[one, two]) => {
    // default visit can be structured in a few differnt ways
    const [url, conf] = two === 'object'
        ? [one, two]
        : one === 'object'
            ? [one.url, one]
            : [one, {}];

    return orig(url, {...conf, ...visitConf});
});

Cypress.Commands.overwrite('route', (orig, ...args: any[]) => {
    if (args.length < 4) return orig(...args);

    const [method, url, maybeFnMaybeResponse, ...responses] = args;

    const fn = typeof maybeFnMaybeResponse === 'function'
        ? maybeFnMaybeResponse
        : () => true; // we are in subsequent call mode so all bodies match

    const allResponses = typeof maybeFnMaybeResponse === 'function'
        ? responses
        : [maybeFnMaybeResponse, ...responses]

        return (improvedRouterCommandHandler as any)(method, url, fn, ...allResponses);
});

declare namespace Cypress {
    interface Chainable {
      routeBodyMatchers: routeMatcher[]|undefined;
      route<T = any>(method: string, url: string, tester: (body: T) => boolean, response: any): void
      route<T = any>(method: string, url: string, response: any, ...responses: any[]): void
    }
}

type bodyMatcher = (body: any) => any|'__NO_MATCH__';
type routeMatcher = (method: string, url: string) => bodyMatcher|false;