machinegame.js

var occupiedCastles = [];
var pickedWrenches = [];

function play(state) {
    var wrenches = state.wrenches;
    var others = state.others;
    for (var i = 0; i < state.bots.length; i++) {
        var bot = state.bots[i];
        if (attackIfNearEnemies(bot, others)) {
            console.log('attackIfNearEnemies');
            continue;
        }
        if (occupyCastle(bot, state.castles)) {
            console.log('occupyCastle');
            continue;
        }
        if (bot.wrenches >= 3) {
            bot.build();
        } else {
            var closestWrenchIndex = findUnpickedClosestWrench(bot, wrenches);
            if (closestWrenchIndex >= 0) {
                if (bot.x === wrenches[closestWrenchIndex].x 
                    && bot.y === wrenches[closestWrenchIndex].y) {
                    bot.collect();
                    pickedWrenches.push(wrenches[closestWrenchIndex]);
                } else {
                    bot.moveTo(wrenches[closestWrenchIndex]);
                }
            } else {
                bot.moveTo({ x: bot.x + 1, y: bot.y + 1 });
            }
        }
    }
}

function occupyCastle(bot, castles) {
    var index = -1, minLength = 100;
    for (var i = 0; i < castles.length; i++) {
        if (!hasItem(occupiedCastles, castles[i])) {
            var distance = getLength(bot, castles[i]);
            if (distance === 0) {
                occupiedCastles.push(castles[i]);
                return true;
            }
            if (distance < minLength) {
                minLength = distance;
                index = i;
            }
        } else if (castles[i].x === bot.x && castles[i].y === bot.y) {
            return true;
        }
    }
    if (index === -1) {
        return false;
    }
    if (castles[index].x === bot.x && castles[index].y === bot.y) {
        occupiedCastles.push(castles[index]);
    } else {
        bot.moveTo(castles[index]);
    }
    
    return true;
}

function attackIfNearEnemies(bot, enemies) {
    if (bot.wrenches < 2) {
        return false;
    }
    for (var i = 0; i < enemies.length; i++) {
        var distance = getLength(bot, enemies[i]);
        if (distance === 1) {
            bot.attack(enemies[i]);
            return true;
        }
    }
    return false;
}

function findUnpickedClosestWrench(bot, wrenches) {
    var index = -1, minLength = 100;
    for (var i = 0; i < wrenches.length; i++) {
        if (!hasItem(pickedWrenches, wrenches[i])) {
            var distance = getLength(bot, wrenches[i]);
            if (distance < minLength) {
                minLength = distance;
                index = i;
            }
        }
    }
    return index;
}

function hasItem(arr, item) {
   for (var j = 0; j < arr.length; j++) {
        if (arr[j].x === item.x && arr[j].y === item.y) {
            return true;
        }
    }
    return false;
}

function getLength(first, second) {
    return Math.sqrt((first.x - second.x) * (first.x - second.x) 
        + (first.y - second.y) * (first.y - second.y));
}