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'use strict';

const puppeteer = require('puppeteer'),
    {ConnectionDelegate} = require('@nesk/rialto'),
    Logger = require('@nesk/rialto/src/node-process/Logger'),
    ConsoleInterceptor = require('@nesk/rialto/src/node-process/NodeInterceptors/ConsoleInterceptor'),
    StandardStreamsInterceptor = require('@nesk/rialto/src/node-process/NodeInterceptors/StandardStreamsInterceptor');

/**
 * Handle the requests of a connection to control Puppeteer.
 */
class PuppeteerConnectionDelegate extends ConnectionDelegate
{
    /**
     * Constructor.
     *
     * @param  {Object} options
     */
    constructor(options) {
        super(options);

        this.browsers = new Set;

        this.addSignalEventListeners();
    }

    /**
     * @inheritdoc
     */
    async handleInstruction(instruction, responseHandler, errorHandler) {
        instruction.setDefaultResource(puppeteer);

        let value = null;

        try {
            value = await instruction.execute();
        } catch (error) {
            if (instruction.shouldCatchErrors()) {
                return errorHandler(error);
            }

            throw error;
        }

        if (this.isInstanceOf(value, 'Browser')) {
            this.browsers.add(value);

            if (this.options.log_browser_console === true) {
                const initialPages = await value.pages()
                initialPages.forEach(page => page.on('console', this.logConsoleMessage));
            }
        }

        if (this.options.log_browser_console === true && this.isInstanceOf(value, 'Page')) {
            value.on('console', this.logConsoleMessage);
        }

        responseHandler(value);
    }

    /**
     * Checks if a value is an instance of a class. The check must be done with the `[object].constructor.name`
     * property because relying on Puppeteer's constructors isn't viable since the exports aren't constrained by semver.
     *
     * @protected
     * @param  {*} value
     * @param  {string} className
     *
     * @see {@link https://github.com/GoogleChrome/puppeteer/issues/3067|Puppeteer's issue about semver on exports}
     */
    isInstanceOf(value, className) {
        const nonObjectValues = [undefined, null];

        return !nonObjectValues.includes(value)
            && !nonObjectValues.includes(value.constructor)
            && value.constructor.name === className;
    }

    /**
     * Log the console message.
     *
     * @param  {ConsoleMessage} consoleMessage
     */
    async logConsoleMessage(consoleMessage) {
        const type = consoleMessage.type();

        if (!ConsoleInterceptor.typeIsSupported(type)) {
            return;
        }

        const level = ConsoleInterceptor.getLevelFromType(type);
        const args = await Promise.all(consoleMessage.args().map(arg => arg.jsonValue()));

        StandardStreamsInterceptor.startInterceptingStrings(message => {
            Logger.log('Browser', level, ConsoleInterceptor.formatMessage(message));
        });

        ConsoleInterceptor.originalConsole[type](...args);

        StandardStreamsInterceptor.stopInterceptingStrings();
    }

    /**
     * Listen for process signal events.
     *
     * @protected
     */
    addSignalEventListeners() {
        for (let eventName of ['SIGINT', 'SIGTERM', 'SIGHUP']) {
            process.on(eventName, () => {
                this.closeAllBrowsers();
                process.exit();
            });
        }
    }

    /**
     * Close all the browser instances when the process exits.
     *
     * Calling this method before exiting Node is mandatory since Puppeteer doesn't seem to handle that properly.
     *
     * @protected
     */
    closeAllBrowsers() {
        for (let browser of this.browsers.values()) {
            browser.close();
        }
    }
}

module.exports = PuppeteerConnectionDelegate;