export class CodeRunner {
    constructor(console, codeStopper) {
        this.console = console;
        this.codeStopper = codeStopper;
        this.isRunning = false;
        this.evalScope = {};

        window.playgroundConsole = this.console;
    }

    setCode(code) {
        this.code = code;
    }

    async run() {
        this.isRunning = true;

        this.console.log("Running code...");

        this.codeStopper.start();

        // Use RNG to prevent caching
        const encodedText = encodeURIComponent(
            `let console=playgroundConsole;${this.code}/*(tph): ${Math.random()}*/`,
        );

        try {
            const module = await import(`data:text/javascript;charset=utf-8,${encodedText}`);
            this.evalScope = Object.assign(this.evalScope, module);
        } catch (error) {
            this.console.error(error);
        }
    }

    stop() {
        this.isRunning = false;
        this.codeStopper.stop();
        this.console.log("Stopping code...");
    }

    toggle() {
        if (this.isRunning) {
            this.stop();
        } else {
            this.run();
        }
    }

    evaluateCode(code) {
        // Move evalScope to window
        const oldWindow = {};
        for (const prop in this.evalScope) {
            if (!this.evalScope.hasOwnProperty(prop)) continue;

            oldWindow[prop] = window[prop];
            window[prop] = this.evalScope[prop];
        }

        // Evaluate code
        const func = new Function(`"use strict";return ${code}`);

        try {
            const result = func();

            this.console.log(result);
        } catch (e) {
            this.console.error(e);

            if (e instanceof ReferenceError) {
                this.console.info("Note: use `export` to allow use of variables within the console");
            }
        }

        // Restore old window props
        for (const prop in oldWindow) {
            if (!oldWindow.hasOwnProperty(prop)) continue;

            window[prop] = oldWindow[prop];
        }
    }
}