import { onError } from '../track';

export default function () {
    // Check if the browser supports window.error
    if (typeof window.onerror === 'undefined' && window.console) {
        // Browser doesn't support window.error, log errors via console instead
        let oldFnType = window.console.error;

        window.console.error = function () {
            onError({
                data: Array.prototype.slice.call(arguments).join(' '),
                occurredAt: new Date(),
                source: 'Console',
                stack: 'Not Available',
                category: 'Not Available'
            });
            oldFnType.apply(this, arguments);
        };

        // window.onerror is not supported by the browser
        // Track errors by checking the console instead
    } else {
        window.onerror = function (msg, source, lineNo, columnNo, error) {
            let target, data;
            let stack = "Unavailable";
            let category = "Unavailable";

            // Some (older) browsers don't give the error object parameter
            if (error != null) {
                target = source + " - Line: " + lineNo + " - Column: " + columnNo;
                data = error.name + ": " + error.message;
                category = error.name;
                // error.stack is currently marked as non-standard
                if (error.stack != null) {
                    stack = error.stack;
                }
                // Some (older) browsers don't give the columnNo parameter
            } else if (columnNo != null) {
                target = source + " - Line: " + lineNo + " - Column: " + columnNo;
                data = msg;
            } else {
                target = source + " - Line: " + lineNo;
                data = msg;
            }

            onError({
                data: data,
                occurredAt: new Date(),
                source: target,
                stack: stack,
                category: category
            });
        }
    }
}