// Copyright (c) 2015-2016 Yuya Ochiai
// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
import {spawn} from 'child_process';
import fs from 'fs';

import os from 'os';
import path from 'path';

import {app, BrowserWindow, dialog} from 'electron';

import log from 'electron-log';

const BUTTON_OK = 'OK';
const BUTTON_SHOW_DETAILS = 'Show Details';
const BUTTON_REOPEN = 'Reopen';

function createErrorReport(err: Error) {
    // eslint-disable-next-line no-undef
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore
    return `Application: ${app.name} ${app.getVersion()} [commit: ${__HASH_VERSION__}]\n` +
         `Platform: ${os.type()} ${os.release()} ${os.arch()}\n` +
         `${err.stack}`;
}

function openDetachedExternal(url: string) {
    const spawnOption = {detached: true, stdio: 'ignore' as any};
    switch (process.platform) {
    case 'win32':
        return spawn('cmd', ['/C', 'start', url], spawnOption);
    case 'darwin':
        return spawn('open', [url], spawnOption);
    case 'linux':
        return spawn('xdg-open', [url], spawnOption);
    default:
        return undefined;
    }
}

export default class CriticalErrorHandler {
    mainWindow?: BrowserWindow;

    setMainWindow(mainWindow: BrowserWindow) {
        this.mainWindow = mainWindow;
    }

    windowUnresponsiveHandler() {
        if (!this.mainWindow) {
            return;
        }
        dialog.showMessageBox(this.mainWindow, {
            type: 'warning',
            title: app.name,
            message: 'The window is no longer responsive.\nDo you wait until the window becomes responsive again?',
            buttons: ['No', 'Yes'],
            defaultId: 0,
        }).then(({response}) => {
            if (response === 0) {
                throw new Error('BrowserWindow \'unresponsive\' event has been emitted');
            }
        });
    }

    processUncaughtExceptionHandler(err: Error) {
        const file = path.join(app.getPath('userData'), `uncaughtException-${Date.now()}.txt`);
        const report = createErrorReport(err);
        fs.writeFileSync(file, report.replace(new RegExp('\\n', 'g'), os.EOL));

        if (app.isReady()) {
            const buttons = [BUTTON_SHOW_DETAILS, BUTTON_OK, BUTTON_REOPEN];
            if (process.platform === 'darwin') {
                buttons.reverse();
            }
            if (!this.mainWindow?.isVisible) {
                return;
            }
            dialog.showMessageBox(
                this.mainWindow,
                {
                    type: 'error',
                    title: app.name,
                    message: `The ${app.name} app quit unexpectedly. Click "Show Details" to learn more or "Reopen" to open the application again.\n\nInternal error: ${err.message}`,
                    buttons,
                    defaultId: buttons.indexOf(BUTTON_REOPEN),
                    noLink: true,
                },
            ).then(({response}) => {
                let child;
                switch (response) {
                case buttons.indexOf(BUTTON_SHOW_DETAILS):
                    child = openDetachedExternal(file);
                    if (child) {
                        child.on(
                            'error',
                            (spawnError) => {
                                log.error(spawnError);
                            },
                        );
                        child.unref();
                    }
                    break;
                case buttons.indexOf(BUTTON_REOPEN):
                    app.relaunch();
                    break;
                }
                app.exit(-1);
            });
        } else {
            log.error(`Window wasn't ready to handle the error: ${err}\ntrace: ${err.stack}`);
            throw err;
        }
    }
}