if __name__ == '__main__':
    print('Run main.py instead.')
    exit(1)

import os
import time
import importlib
from math import floor, ceil

USERNAME = os.environ['USERNAME']
PASSWORD = os.environ['PASSWORD']
SERVER = os.environ['SERVER']

import monkey_patch # must be before any possible pyCraft imports


from minecraft import authentication
from minecraft.exceptions import YggdrasilError
from minecraft.networking.connection import Connection
from minecraft.networking.packets import Packet, clientbound, serverbound

from protocol.managers import DataManager, ChunksManager, ChatManager, ChunkNotLoadedException
from protocol.packets import TimeUpdatePacket, SetSlotPacket

from bunch import Bunch
from panda3d.core import LPoint3f, LVector3f

import packet_handlers
importlib.reload(packet_handlers)
import blocks
importlib.reload(blocks)
import utils
importlib.reload(utils)
import path
importlib.reload(path)

TICK = 0.05
last_tick = time.time()

PITCH_ANGLE_DIR = LVector3f(x=0, y=1, z=0)
YAW_ANGLE_DIR = LVector3f(x=0, y=0, z=-1)
YAW_ANGLE_REF = LVector3f(x=0, y=1, z=0)
YAW_LOOK_AHEAD = 4



def tick(global_state):
    g = global_state
    l = g.local_state
    p = g.pos

    target = None

    try:
        g.chunks.get_block_at(*utils.pint(p))
    except ChunkNotLoadedException:
        return

    #l.jobstate.run()

    if l.path and len(l.path):
        target = LPoint3f(l.path[0])
        target.x += 0.5
        target.z += 0.5

    if target:
        d = p - target

        # jump up block
        if d.y < -0.9 and not l.y_v:
            l.y_v = 8.5
            l.y_a = -36.0

        # jump gap
        if d.xz.length() > 1.6 and not l.y_v:
            l.y_v = 8.5
            l.y_a = -36.0

        if d.length() > 0:
            if l.y_v < 5:
                p.x -= utils.cap(d.x, 0.2)
                p.z -= utils.cap(d.z, 0.2)

        if len(l.path) > 1 and d.length() < 0.2:
            # removes some jitter in walking
            l.path.pop(0)
        elif d.length() == 0:
            l.path.pop(0)

    if l.y_v or l.y_a:
        p.y += l.y_v * TICK
        l.y_v += l.y_a * TICK

    block_below = g.chunks.get_block_at(floor(p.x), ceil(p.y-1), floor(p.z))
    in_air = block_below in blocks.NON_SOLID_IDS

    if in_air:
        l.y_a = -36.0
    else:
        p.y = ceil(p.y)
        l.y_v = 0
        l.y_a = 0

    if l.look_at:
        look_at = LPoint3f(l.look_at)
    elif l.path and len(l.path) > YAW_LOOK_AHEAD:
        look_at = LPoint3f(l.path[YAW_LOOK_AHEAD])
    elif l.path and len(l.path):
        look_at = LPoint3f(l.path[-1])
    else:
        look_at = None

    if look_at:
        look_at.x += 0.5
        look_at.z += 0.5
        look_at_d = p - look_at

        if look_at_d.length() > 0.6:
            target_pitch = look_at_d.normalized().angleDeg(PITCH_ANGLE_DIR)
            target_pitch = (target_pitch - 90) * -1
            target_pitch_d = target_pitch - l.pitch
            l.pitch += utils.cap(target_pitch_d, 10)

            # remove vertical component for yaw calculation
            look_at_d.y = 0

            target_yaw = look_at_d.normalized().signedAngleDeg(other=YAW_ANGLE_DIR, ref=YAW_ANGLE_REF)
            target_yaw_d = target_yaw - l.yaw
            target_yaw_d = (target_yaw_d + 180) % 360 - 180
            l.yaw += utils.cap(target_yaw_d, 30)
    else:
        target_pitch_d = 0 - l.pitch
        l.pitch += utils.cap(target_pitch_d, 10)

    packet = serverbound.play.PositionAndLookPacket(x=p.x, feet_y=p.y, z=p.z, pitch=l.pitch, yaw=l.yaw, on_ground=(not in_air))
    g.connection.write_packet(packet, force=True)


def init(global_state):
    g = global_state
    l = g.local_state

    l.time = 0

    l.path = []
    l.look_at = None
    l.y_v = 0
    l.y_a = 0
    l.yaw = 360
    l.pitch = 0

    #l.break = None
    #l.break_time = 0
    #l.break_timeout = 0
    #l.break_finished_packet = None

    #l.jobstate = JobStates(connection, player_info)
    #l.jobstate.run()

def bot(global_state):
    g = global_state
    g.local_state = Bunch()

    if not g.mcdata:
        g.mcdata = DataManager('./mcdata')

    if not g.connection:
        auth_token = authentication.AuthenticationToken()
        try:
            auth_token.authenticate(USERNAME, PASSWORD)
        except YggdrasilError as e:
            print(e)
            sys.exit()
        print("Logged in as %s..." % auth_token.username)
        g.connection = Connection(SERVER, 25565, auth_token=auth_token)

        g.chunks = ChunksManager(g.mcdata)

        g.connection.connect()

    def packet_wrapper(handler):
        def wrapper(packet):
            handler(packet, g)
        return wrapper

    g.chunks.register(g.connection)

    def x(p):
        print(p)

    h = packet_wrapper(packet_handlers.handle_block_change)
    g.connection.register_packet_listener(h, clientbound.play.BlockChangePacket)

    h = packet_wrapper(packet_handlers.handle_join_game)
    g.connection.register_packet_listener(h, clientbound.play.JoinGamePacket)

    h = packet_wrapper(packet_handlers.handle_position_and_look)
    g.connection.register_packet_listener(h, clientbound.play.PlayerPositionAndLookPacket)

    g.chat = ChatManager(g)
    h = packet_wrapper(packet_handlers.handle_chat)
    g.chat.set_handler(h)

    h = packet_wrapper(packet_handlers.handle_time_update)
    g.connection.register_packet_listener(h, TimeUpdatePacket)

    h = packet_wrapper(packet_handlers.handle_set_slot)
    g.connection.register_packet_listener(h, SetSlotPacket)

    try:
        while not g.pos:
            time.sleep(TICK)
        print('Player loaded.')

        x, y, z = utils.pint(g.pos)
        while (floor(x/16), floor(y/16), floor(z/16)) not in g.chunks.chunks:
            time.sleep(TICK)
        print('Chunks loaded.')

        init(g)

        while g.running:
            tick(g)

            global last_tick
            sleep_time = TICK + last_tick - time.time()
            if sleep_time < 0: sleep_time = 0
            time.sleep(sleep_time)
            last_tick = time.time()
    finally:
        print('Removing listeners...')
        g.connection.packet_listeners = []
        g.connection.early_packet_listeners = []
        g.connection.outgoing_packet_listeners = []
        g.connection.early_outgoing_packet_listeners = []

print('Bot module loaded.')