import * as plugins from './tswatch.plugins.js';
import { logger } from './tswatch.logging.js';
/**
 * A watcher keeps track of one child execution
 */
export class Watcher {
    constructor(optionsArg) {
        /**
         * used to execute shell commands
         */
        this.smartshellInstance = new plugins.smartshell.Smartshell({
            executor: 'bash',
        });
        this.smartchokWatcher = new plugins.smartchok.Smartchok([]);
        this.options = optionsArg;
    }
    /**
     * start the file
     */
    async start() {
        await this.setupCleanup();
        console.log(`Looking at ${this.options.filePathToWatch} for changes`);
        this.smartchokWatcher.add([this.options.filePathToWatch]); // __dirname refers to the directory of this very file
        await this.smartchokWatcher.start();
        const changeObservable = await this.smartchokWatcher.getObservableFor('change');
        changeObservable.subscribe(() => {
            this.updateCurrentExecution();
        });
        await this.updateCurrentExecution();
    }
    /**
     * updates the current execution
     */
    async updateCurrentExecution() {
        if (this.options.commandToExecute) {
            if (this.currentExecution) {
                logger.log('ok', `reexecuting ${this.options.commandToExecute}`);
                this.currentExecution.kill();
            }
            else {
                logger.log('ok', `executing ${this.options.commandToExecute} for the first time`);
            }
            this.currentExecution = await this.smartshellInstance.execStreaming(this.options.commandToExecute);
        }
        else {
            console.log('no executionCommand set');
        }
        if (this.options.functionToCall) {
            this.options.functionToCall();
        }
        else {
            console.log('no functionToCall set.');
        }
    }
    /**
     * this method sets up a clean exit strategy
     */
    async setupCleanup() {
        process.on('exit', () => {
            console.log('');
            console.log('now exiting!');
            this.stop();
            process.exit(0);
        });
        process.on('SIGINT', () => {
            console.log('');
            console.log('ok! got SIGINT We are exiting! Just cleaning up to exit neatly :)');
            this.stop();
            process.exit(0);
        });
        // handle timeout
        if (this.options.timeout) {
            plugins.smartdelay.delayFor(this.options.timeout).then(() => {
                console.log(`timed out afer ${this.options.timeout} milliseconds! exiting!`);
                this.stop();
                process.exit(0);
            });
        }
    }
    /**
     * stops the watcher
     */
    async stop() {
        await this.smartchokWatcher.stop();
        if (this.currentExecution && !this.currentExecution.childProcess.killed) {
            this.currentExecution.kill();
        }
    }
}
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