Kantaris the Banished

//Special thanks to Sakuya Izayoi for the Area Array, Cleanup Function, and RandomBlock Picker and Daot for his epic video on NPC Tactics for the teleporting\\
/* VARIABLE FUNCTIONS */
var rand = function(a, b){ return Math.random()*(b - a) + a };
//-------------------\\

var ax, az, x, y, z, px, py, pz, flag=0, count=0;
var offset = 3;
var phase = 1;
var maxHP;
var currentHP;
var _oldMeleeRange;
var _oldRangedRange;
var _rangeDelayMin = 35;
var _rangeDelayMax = 50;
var _moveSpeed = 4;
var explosionTrigger = false;

/* ARENA ROOM VARIABLE CONTROL */
var origin = { x:25, y:15, z:5 }
var offsets = { x:0, z:0, y:0, xd:-20, zd:20, yd:-10 };
var area = { x:origin.x + offsets.x, z:origin.z + offsets.z, y:origin.y + offsets.y, xd:origin.x + offsets.xd, zd:origin.z + offsets.zd, yd:origin.y + offsets.yd };
//-------------------\\

function init(event)
{
    phase = 1;
    var resetMinions = event.npc.world.getNearbyEntities(event.npc.getX(), event.npc.getY(), event.npc.getZ(), 64, 2);
    for(var i = 0; i < resetMinions.length; i++) { if(resetMinions[i].display.name == "Minion of Kantaris") { resetMinions[i].despawn(); } }
    explosionTrigger = false;
    event.npc.timers.clear();
    event.npc.display.setVisible(0);
    event.npc.setHealth(event.npc.getMaxHealth());
    event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Spawn master @p");
    event.npc.world.broadcast("<Kantaris the Banished> \u00A7cAssuming control!");
    event.npc.getAi().setWalkingSpeed(_moveSpeed);
    event.npc.stats.getMelee().setRange(2);
    event.npc.stats.getRanged().setRange(12);
    event.npc.getAi().setNavigationType(0);
    event.npc.stats.getRanged().setDelay(_rangeDelayMin, _rangeDelayMax);
    cleanup(event);
}

function kill(event)
{
    event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_KilledTarget master @p");
    event.npc.world.broadcast("<Kantaris the Banished> \u00A7cI sense your weakness!");
    var playersAlive = event.npc.world.getNearbyEntities(event.npc.getX(), event.npc.getY(), event.npc.getZ(), 200, EntityType_PLAYER);
    if (playersAlive == 0){ totalReset(event); }
}

function damaged(event)
{
    maxHP = event.npc.getMaxHealth();
    currentHP = event.npc.getHealth();
    var currentPercent = getWholePercent(currentHP, maxHP);
    //Phase 1 Tactics - Evasion and Teleport
    if (event.source != null)
    {
        if ((event.source.getType() == 1) && phase == 1)
        {
            event.npc.display.setVisible(1);
            flag=1;
            event.npc.getTempdata().put("player",event.source);
        }
        //Change to Phase 2\\
        if ((currentPercent <= 75) && (phase == 1)) { phaseChange(event); }
        //Change to Phase 3\\
        if ((currentPercent <= 50) && (phase == 2)) { phaseChange(event); }
        //Change to Phase 4\\
        if ((currentPercent <= 25) && (phase == 3)) { phaseChange(event); }
    }
}

function died(event)
{
    event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Died master @p");
    event.npc.world.broadcast("<Kantaris the Banished> \u00A7cI will find you again...");
    for (var i = 0; i < 6; i++)
    {
        if (event.npc.timers.has(i))
        event.npc.timers.stop(i);
    }
    event.npc.timers.clear();
    cleanup(event);
}

function phaseChange(event)
{
    phase++
    event.npc.display.setVisible(0);
    event.npc.executeCommand('/execute @p[c=4] ~ ~ ~ title @p title {"text":"Entering Phase: '+phase+'!","color":"red"}');
    switch(phase)
    {
    case 2:
        event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Phase2 master @p");
        event.npc.world.broadcast("<Kantaris the Banished> \u00A7cOur power is unmatched!");
        break;
    case 3:
        event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Phase3 master @p");
        event.npc.world.broadcast("<Kantaris the Banished> \u00A7cProgress cannot be halted!");
        break;
    case 4:
        event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Phase4 master @p");
        event.npc.world.broadcast("<Kantaris the Banished> \u00A7cDestroying this body gains you nothing!");
        break;
    }
}

function tick(event)
{
    //Phase 1 - Utilizes Evasion Tactics
    if ((flag) && (phase == 1))
    {
        az = offset*Math.sin((event.npc.getTempdata().get("player").getRotation()+90)*Math.PI/180);
        ax = offset*Math.cos((event.npc.getTempdata().get("player").getRotation()+90)*Math.PI/180);
        x = event.npc.getTempdata().get("player").getX()-ax;
        z = event.npc.getTempdata().get("player").getZ()-az;
        y = event.npc.getTempdata().get("player").getY();
        if (!event.npc.world.getBlock(x,y,z)&&!event.npc.world.getBlock(x,y+1,z))
        {
            event.npc.setPosition(x,y,z);
            count++;
            if (count==20)
            {
                flag=0;
                count=0;
            }
            event.npc.display.setVisible(0);
        }  else {
            event.npc.display.setVisible(0);
        }
    }

    //Phase 2 - Utilize Explosions
    if (phase == 2)
    {
        if (!event.npc.timers.has(1))
        {
            event.npc.timers.start(1, 600, true);
        }
        if ((explosionTrigger) && (!event.npc.timers.has(3)))
        {
            event.npc.timers.start(3, 140, true);
        }
    }

    //Phase 3 - Summon Minions
    if (phase == 3)
    {
        if (!event.npc.timers.has(4))
        {
            event.npc.timers.start(4, 600, true);
        }
    }

    //Phase 4 - Break Celing
    if (phase == 4)
    {
        if (!event.npc.timers.has(5))
        {
            event.npc.timers.start(5, 220, true);
        }
    }
}

function timer(event)
{
    if (event.id == 1) //Special Ability Placement for Explosions
    {
        event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_Phase2_Special master @p");
        event.npc.getAi().setNavigationType(1);
        event.npc.navigateTo(16, 12, 15, 5);
        event.npc.setPosition(16, 12, 15)
        _oldMeleeRange = event.npc.stats.getMelee().getRange();
        _oldRangesRange = event.npc.stats.getRanged().getRange();
        event.npc.stats.getMelee().setRange(0);
        event.npc.stats.getRanged().setRange(16);
        event.npc.stats.getRanged().setDelay(15, 30);
        event.npc.timers.start(2, 300, false);
        explosionTrigger = true;
        event.npc.getAi().setWalkingSpeed(0)
    }
    if (event.id == 2) //Expiration of Special Ability and Reset of All Previous Values and Position
    {
        event.npc.getAi().setNavigationType(0);
        event.npc.getAi().setWalkingSpeed(_moveSpeed);
        x = event.npc.getTempdata().get("player").getX();
        z = event.npc.getTempdata().get("player").getZ();
        y = event.npc.getTempdata().get("player").getY();
        event.npc.navigateTo(x, y, z, 4);
        event.npc.stats.getMelee().setRange(_oldMeleeRange);
        event.npc.stats.getRanged().setRange(_oldRangedRange);
        event.npc.stats.getRanged().setDelay(_rangeDelayMin, _rangeDelayMax);
        explosionTrigger = false;
    }
    if (event.id == 3) //Trigger the Explosion
    {
        x = event.npc.getTempdata().get("player").getX();
        z = event.npc.getTempdata().get("player").getZ();
        y = event.npc.getTempdata().get("player").getY();
        if (explosionTrigger){ event.npc.world.explode(x, y, z, 0.6, true, false); }
    }
    if (event.id == 4) //Minion Timer
    {
        var kantarisBoss = event.npc;
        kantarisBoss.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_SpawnAdds master @p");
        kantarisBoss.world.broadcast("<Kantaris the Banished> \u00A7cSentient beings need never feel pain!");
        x = event.npc.getTempdata().get("player").getX();
        z = event.npc.getTempdata().get("player").getZ();
        y = event.npc.getTempdata().get("player").getY();
        var minionCount = randomIntFromInterval(1, 3);
        for (i = 0; i < minionCount; i++)
        {
           var kantarisMinion = event.API.getClones().get(1, "Minion of Kantaris", event.npc.getWorld());
           kantarisMinion.setHome(kantarisBoss.x, kantarisBoss.y, kantarisBoss.z + 3);
           kantarisMinion.setPosition(x + randomIntFromInterval(3, 8), y, z + randomIntFromInterval(2, 4));
           kantarisMinion.spawn();
        }
    }
    if (event.id == 5) //Final Phase Ceiling Collapse Timer
    {
        var targetBlock = chooseRandomBlock(event.npc.world, area.x, area.xd , area.z , area.zd, area.y)
        targetBlock.remove();
        event.npc.executeCommand("/execute @p[c=4] ~ ~ ~ playsound Kantaris_BreakRoof master @p");
        event.npc.world.broadcast("<Kantaris the Banished> \u00A7cYou are bacteria!");
    }
}
//----------------------------UTILITY FUNCTIONS----------------------------\\
function randomGenWhole(){ return Math.floor(Math.random() * 20); }
function randomIntFromInterval(min,max){ return Math.floor(Math.random()*(max-min+1)+min); }
function getWholePercent(percentFor, percentOf){ return Math.floor(percentFor/percentOf * 100) }
function chooseRandomBlock(world, x1, x2, z1, z2, y) { x = rand(x1, x2); z = rand(z1, z2); return world.getBlock(x, y, z); }
function totalReset(event)
{
    phase = 1;
    var resetMinions = event.npc.world.getNearbyEntities(event.npc.getX(), event.npc.getY(), event.npc.getZ(), 32, 2);
    for(var i = 0; i < resetMinions.length; i++) { if(resetMinions[i].display.name == "Minion of Kantaris") { resetMinions[i].despawn(); } }
    explosionTrigger = false;
    event.npc.timers.clear();
    event.npc.display.setVisible(0);
    event.npc.setHealth(event.npc.getMaxHealth());
    event.npc.getAi().setWalkingSpeed(_moveSpeed);
    event.npc.stats.getMelee().setRange(2);
    event.npc.stats.getRanged().setRange(12);
    event.npc.getAi().setNavigationType(0);
    event.npc.stats.getRanged().setDelay(_rangeDelayMin, _rangeDelayMax);
    cleanup(event);
}
function cleanup(event)
{
/*repair glass*/
/*two rows on +/- X*/
var glassPlane = ''+(area.x-1)+' '+area.y+' '+area.z+' '+(area.xd+1)+' '+area.y+' '+area.zd
event.npc.executeCommand('/fill '+glassPlane+' tconstruct:clear_glass 0 replace')
var lavaArea = ''+area.x+' '+area.y+' '+area.z+' '+area.xd+' '+area.yd+' '+area.zd
event.npc.executeCommand('/fill '+lavaArea+' minecraft:air 0 replace minecraft:lava')
event.npc.executeCommand('/fill '+lavaArea+' minecraft:air 0 replace minecraft:flowing_lava')
}