#!/usr/bin/env node

'use strict';

const Promise = require("bluebird");
const chokidar = require("chokidar");
const fs = Promise.promisifyAll(require("fs"));
const path = require("path");
const stacktraceParser = require("stacktrace-parser");

const loadConfiguration = require("./load-configuration");
const printError = require("./print-error");
const createEmailSender = require("./email/create-sender");
const generateEmailPreview = require("./email/generate-preview");
const readError = require("./error/read");
const parseError = require("./error/parse");

let config = loadConfiguration(process.argv[2]);

let transport = createEmailSender(config);

function reportError(errorFilePath) {
    Promise.try(() => {
        return readError(errorFilePath);
    }).then((errorData) => {
        let error = parseError(errorData.error);

        // FIXME: Strip everything after the first line of the message?
        let subjectLine = config.subjectFormat.replace(/\$type/g, error.name).replace(/\$message/g, error.message.replace(/\n/g, " "));

        return Promise.try(() => {
            return transport.sendMail({
                subject: subjectLine,
                text: generateEmailPreview({
                    environmentName: errorData.environmentName,
                    hostname: errorData.hostname,
                    error: error,
                }, config.stackFilter),
                attachments: [{
                    filename: path.basename(errorFilePath),
                    content: JSON.stringify(Object.assign(errorData, {
                        parsedStack: error.stack,
                        simplifiedStack: error.stackWithout("*", true)
                    }), null, "\t")
                }]
            });
        }).then(() => {
            console.log(`Reported error in ${path.basename(errorFilePath)}: ${error.name} - ${error.message}`);
        });
    }).catch((err) => {
        printError([
            `ERROR: Unable to parse or report error for ${errorFilePath}.`,
            err
        ]);
    });
}

chokidar.watch(config.errorPath, {ignoreInitial: true})
    .on("add", (errorFilePath) => {
        reportError(errorFilePath);
    })
    .on("ready", () => {
        console.log("Listening for new errors...");
    });