"use strict";

function newGame(amountDoors) {
    const doors = []

    // Fill door array with zeroes
    for (let i = 0; i < amountDoors; i++) {
        doors.push({
            thing: "goat",
            revealed: false
        });
    }

    // Add a car somewhere
    doors[Math.floor(Math.random() * amountDoors)].thing = "car";

    return {
        wins: 0,
        losses: 0,
        doors: doors,
        choice: null
    };
}

function pick(game, index) {
    game.choice = index;
    return game;
}

function reveal(game) {
    if (game.doors[game.choice].thing === "goat") {
        // Player chose goat
        for (let i = 0; i < game.doors.length; i++) {
            // Reveal everything but the player's choice and the car
            if (i !== game.choice && game.doors[i].thing !== "car") {
                game.doors[i].revealed = true;
            }
        }
    } else {
        // Player chose car
        let stayClosed;
        do {
            stayClosed = Math.floor(Math.random() * game.doors.length);
        } while (stayClosed === game.choice);

        for (let i = 0; i < game.doors.length; i++) {
            // Reveal everything but the player's choice and one random goat
            if (i !== game.choice && i !== stayClosed) {
                game.doors[i].revealed = true;
            }
        }
    }
    return game;
}

function switchChoice(game) {
    let closedCarDoor = null;
    let closedGoatDoor = null;

    for (let i = 0; i < game.doors.length; i++) {
        if (game.doors[i].thing === "car") {
            closedCarDoor = i;
        } else if (game.doors[i].thing === "goat"){
            // is goat
            if (!game.doors[i].revealed) {
                closedGoatDoor = i;
            }
        }
        if (closedCarDoor !== null && closedGoatDoor !== null) {
            break;
        }
    }
    game.choice = game.choice === closedCarDoor ? closedGoatDoor : closedCarDoor;
    return game;
}

function win(game) {
    return game.doors[game.choice].thing === "car";
}


// main
function main(doSwitch) {
    if (doSwitch) console.log("Switching enabled!");

    let wins = 0;
    let losses = 0;

    for (let i = 0; i < 10000; i++) {
        const game = newGame(3);
        pick(game, Math.floor(Math.random() * 3));
        reveal(game);
        if (doSwitch) switchChoice(game);

        if (win(game)) {
            wins++;
        } else losses++;
    }

    console.log("{Wins: " +wins + ", Losses: " + losses + "}");
}

main(false);
main(true);