var mineflayer = require('mineflayer');
var Vec3 = require('vec3').Vec3;

var bot = mineflayer.createBot({
  host: process.argv[2],
  port: parseInt(process.argv[3]),
  username: process.argv[4] ? process.argv[4] : "echo",
  password: process.argv[5],
});

// 改変に伴い必要な変数のみ以下に抽出
var player_of_interest = "noone";
var dst_player_of_interest = 9999;
var chasing_user = "noone";
var last_interact_time = new Date();
var users = {};
var command_timer = 0;

// テンプレ (起動用)
bot.on('message', function(username, message) {
  if (username === bot.username) return;
});

bot.on('connect', function() {
  console.log("connected");
  bot.last_pos = false;
});

bot.on('death', function() {
  console.log("dead");
  bot.clearControlStates();
});

// Health Recovery (ヘルス一定以下で手持ちの食料を食べる)
bot.on('food', function() {
  iconsole.log("health = " + bot.health.toString() +
    ", food = " + bot.food.toString());
  if(bot.health <=16 && bot.food < 19)
  {
    eat.start_eat(bot);
  }
  else {
    eat.end_eat(bot);
  }
});

// look at neaby player (最寄りのエンティティを注視)
bot.on('entityMoved', function(entity) {
  if(entity.type === "mob")
  {
    //fight
    var dst = (bot.entity.position.distanceTo(entity.position));
    if (entity === bot.fighting_enemy){
      bot.dst_fighting_enemy = dst;
      if (dst >= 10){
        bot.fighting_enemy = false;
      }
    }
    if(dst < 10){
      console.log(entity);
    }
    if(entity.mobType == "Zombie")
    {
      bot.fighting_enemy = entity;
      //jump
      var mypos = new Vec3(bot.entity.position.x,
        bot.entity.position.y,
        bot.entity.position.z
      );
      var look_point = mypos.plus(
        pyr2vec(bot.entity.pitch, bot.entity.yaw, 0.8)
      );
      var dp = (mypos.subtract(entity.position));
      var pyr = vec2pitch_yaw_radus(dp);
      if (Math.abs(pyr.yaw - bot.entity.yaw) > 0.05 ||
        Math.abs(pyr.pitch - bot.entity.pitch) > 0.05){
          //console.log("dyaw = " + Math.abs(pyr.yaw - bot.entity.yaw));
        //console.log("yaw = " + pyr.yaw);
        //console.log("pitch = " + pyr.pitch);
        //bot.look(pyr.yaw, pyr.pitch, false, false);
        bot.look(pyr.yaw, 0, false, false);
      }
      //console.log("look = " + pyr2vec(bot.entity.pitch, bot.entity.yaw, 0.8));
      var block_in = bot.blockAt(mypos);
      var block_front = bot.blockAt(look_point);
      var block_front_up = bot.blockAt(look_point.add(new Vec3 (0, 1, 0)));
      if (dst < 3)
      {
        //bot.setControlState("swing", false);
        if(bot.last_pos && checkRaechable(bot.last_pos, entity))
        {
          bot.attack(entity);
          //bot.setControlState("swing", true);
        }
        bot.setControlState("forward", false);
        bot.setControlState("back", true);
      }
      else
      {
        //bot.setControlState("swing", false);
        if (dst < 10){
          bot.setControlState("forward", true);
          bot.setControlState("back", false);
        }
        else{
          bot.setControlState("forward", false);
          bot.setControlState("back", false);
          //bot.setControlState("swing", false);
        }
      }
    }
  }
  else if(entity.type === "player"){
    users[entity.username] = entity;
    //console.log("entity moved");
    //console.log(entity);
    dst = (bot.entity.position.distanceTo(entity.position));
    //console.log("d = " + dst);
    if(player_of_interest === entity.username && dst > 2){
      player_of_interst = "noone";
      dst_player_of_interest = 999;
    }

    //being pushed
    if(dst < 0.8){
      var mypos = new Vec3(bot.entity.position.x,
        0,
        bot.entity.position.z
      );
      var yourpos = new Vec3(entity.position.x,
        0,
        entity.position.z
      );
      mypos.subtract(yourpos);
      mypos = mypos.scaled(60);
      //console.log("pushed");
      //console.log(mypos);
      bot.entity.velocity.add(mypos);
    }

    if(dst < 2){
      var do_interact = false;
      if(player_of_interest === entity.username){
        dst_player_of_interest = dst;
        do_interact = true;
      }
      else if(dst < dst_player_of_interest){
        player_of_interest = entity.username;
        dst_player_of_interest = dst;
        do_interact = true;
      }

      //if(false){
      if(chasing_user ==="noone" && do_interact == true){
        //avoid too frequent motion
        var now = new Date();
	      var dt = now - last_interact_time;
        //console.log("dt = " + dt);
        if(dt > 200){
          var mypos = new Vec3(bot.entity.position.x,
            bot.entity.position.y,
            bot.entity.position.z
          );
          dp = (mypos.subtract(entity.position));
          pyr = vec2pitch_yaw_radus(dp);
          if (Math.abs(pyr.yaw - bot.entity.yaw) > 0.05 ||
            Math.abs(pyr.pitch - bot.entity.pitch) > 0.05){
            //console.log("dyaw = " + Math.abs(pyr.yaw - bot.entity.yaw));
            bot.look(pyr.yaw, pyr.pitch, false, false);
            //bot.look(pyr.yaw, 0, false, false);
          }
          //bot.lookAt(entity.position, false, false);
          //mimic sneaking
          if (entity.metadata["0"] === 2){
            bot.setControlState("sneak", true);
            if(command_timer){
              clearTimeout(command_timer);
            }
            command_timer = setTimeout(function(){
               bot.clearControlStates();
            }, 500);
          }
          else{
            //bot.setControlState("sneak", false);
          }
          last_interact_time = now;
        }
      }
    }
  }
});

function once_three_seconds(){
  var entity = null;
  //console.log("chasing_user = " + chasing_user);
  //console.log(users);

  //chase player
  if( entity = users[chasing_user]){
    //console.log("chasing_user found");
    var mypos = new Vec3(bot.entity.position.x,
      bot.entity.position.y,
      bot.entity.position.z
    );
    var dp = (mypos.subtract(entity.position));
    var pyr = vec2pitch_yaw_radus(dp);
    if (Math.abs(pyr.yaw - bot.entity.yaw) > 0.05 ||
      Math.abs(pyr.pitch - bot.entity.pitch) > 0.05){
        //console.log("dyaw = " + Math.abs(pyr.yaw - bot.entity.yaw));
      //console.log("yaw = " + pyr.yaw);
      //console.log("pitch = " + pyr.pitch);
      //bot.look(pyr.yaw, pyr.pitch, false, false);
      bot.look(pyr.yaw, 0, false, false);
    }

    var dst = (bot.entity.position.distanceTo(entity.position));
    if(dst >= 2.0){
      //bot.setControlState("swing", false);
      bot.setControlState("forward", true);
      bot.setControlState("back", false);

      //jump
      var mypos = new Vec3(bot.entity.position.x,
        bot.entity.position.y,
        bot.entity.position.z
      );
      var look_point = mypos.plus(
        pyr2vec(bot.entity.pitch, bot.entity.yaw, 0.8)
      );
      //console.log("look = " + pyr2vec(bot.entity.pitch, bot.entity.yaw, 0.8));
      var block_in = bot.blockAt(mypos);
      var block_front = bot.blockAt(look_point);
      var block_front_up = bot.blockAt(look_point.add(new Vec3 (0, 1, 0)));
      //console.log(block);
      if((block_front && block_front.boundingBox === "block" ||
        block_front && block_front.boundingBox === "glass_pane" ||
        block_front && block_front.boundingBox === "cauldon" ) &&
        block_front_up && block_front_up.boundingBox === "empty"){ //climbing
        bot.setControlState("jump", true);
      }
      else if(block_in && block_in.boundingBox === "cauldon") // go out of cauldons
      {
        bot.setControlState("jump", true);
      }
      else{
        bot.setControlState("jump", false);
      }
    }
    else{
      bot.clearControlStates();
      //bot.setControlState("swing", true);
    }

    //bot.lookAt(entity.position, false, false);
    //mimic sneaking
    if (entity.metadata["0"] === 2){
      bot.setControlState("sneak", true);
      if(command_timer){
        clearTimeout(command_timer);
      }
      command_timer = setTimeout(function(){
         bot.clearControlStates();
      }, 500);
    }
    else{
      //bot.setControlState("sneak", false);
    }
  }
  if(chasing_user != "noone")
    setTimeout(once_three_seconds, 100, []);
}

function vec2pitch_yaw_radus(v){
  if(v.x != 0.0){
    yaw = Math.atan2(v.x, v.z);
  }
  else{
    yaw = v.z >= 0 ? Math.PI / 2: -Math.PI / 2;
  }
  const groundDistance = Math.sqrt(v.x * v.x + v.z * v.z)
  pitch = Math.atan2(-v.y, groundDistance)
  radius = v.distanceTo(new Vec3(0, 0, 0))
  return {"pitch": pitch, "yaw": yaw, "radius": radius};
}

bot.on('entitySwingArm', function(entity) {
  if(entity.type === "player"){
    //console.log("entity swinged arm");
    //console.log(entity);
    dst = (bot.entity.position.distanceTo(entity.position));
    //if(0){
    if(dst < 4){
      //calcurate the attack hit or not
      var mypos = new Vec3(bot.entity.position.x,
        bot.entity.position.y,
        bot.entity.position.z
      );
      var yourpos = new Vec3(entity.position.x,
        entity.position.y,
        entity.position.z
      );
      var lookat = pyr2vec(entity.pitch, entity.yaw, dst);
      var d = mypos.distanceTo(lookat.add(yourpos));
      if (d < 0.25){
        //console.log("hit");
        if(chasing_user === entity.username){
          chasing_user = "noone";
          bot.clearControlStates();
        }
        else{
          chasing_user = entity.username;
          setTimeout(once_three_seconds, 200, []);
          bot.clearControlStates();
        }
      }
    }
  }
});

function pyr2vec(p, y, r){
  return new Vec3(
    -r * Math.cos(p) * Math.sin(y),
    r * Math.sin(p),
    -r * Math.cos(p) * Math.cos(y)
  );
}

function vec2pitch_yaw_radus(v){
  if(v.x != 0.0){
    yaw = Math.atan2(v.x, v.z);
  }
  else{
    yaw = v.z >= 0 ? Math.PI / 2: -Math.PI / 2;
  }
  const groundDistance = Math.sqrt(v.x * v.x + v.z * v.z)
  pitch = Math.atan2(-v.y, groundDistance)
  radius = v.distanceTo(new Vec3(0, 0, 0))
  return {"pitch": pitch, "yaw": yaw, "radius": radius};
}

function checkRaechable(me, you)
{
  var mypos = new Vec3(me.position.x,
    me.position.y,
    me.position.z
  );
  var yourpos = new Vec3(you.position.x,
    you.position.y,
    you.position.z
  );
  var dst = (mypos.distanceTo(yourpos));
  var lookat = pyr2vec(me.pitch, me.yaw, dst);
  var d = yourpos.distanceTo(lookat.plus(mypos));
  return d <= 0.3;
}