import { datadogRum } from '@datadog/browser-rum';
import { DATADOG_RUM_FOR_DEV } from './constants';
import { clearOverride, enableOverride } from './override';

interface DevConsole {
    start: () => void;
    stop: () => void;
}

interface DevGlobalSlot {
    [DATADOG_RUM_FOR_DEV]?: DevConsole;
}

declare global {
    interface Window {
        datadogRumForDev?: DevConsole;
    }
}

/* istanbul ignore next: thin seam over location.reload, which jsdom does not implement */
function reloadPage(): void {
    globalThis.location.reload();
}

function start(): void {
    enableOverride();
    // eslint-disable-next-line no-console
    console.info(`[datadog-rum] ${DATADOG_RUM_FOR_DEV}.start(): RUM enabled for 12h; reloading.`);
    reloadPage();
}

function stop(): void {
    try {
        datadogRum.stopSession();
    } catch {
        // ignore: SDK may not be initialized
    }
    clearOverride();
    // eslint-disable-next-line no-console
    console.info(`[datadog-rum] ${DATADOG_RUM_FOR_DEV}.stop(): override cleared; reloading.`);
    reloadPage();
}

export function installDevConsole(): void {
    const slot = globalThis as unknown as DevGlobalSlot;
    if (slot[DATADOG_RUM_FOR_DEV]) {
        return;
    }
    slot[DATADOG_RUM_FOR_DEV] = { start, stop };

    globalThis.addEventListener('storage', event => {
        if (event.key === DATADOG_RUM_FOR_DEV) {
            reloadPage();
        }
    });
}