from __future__ import annotations

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from .objects.Spectator import Spectator
    from .objects.Player import Player
    from .objects.Game import Game
    from .objects.Ball import Ball

from .objects.Point import Point
from .objects.Vector import Point
from .objects.Segment import Segment
from .objects.Vector import Vector

from . import config

from . import config

import math
import asyncio

from asgiref.sync import SyncToAsync

from time import sleep

VERTICALLY = 1
NORMAL = 2

def get_sign(num: float) -> int:
    if (num == 0):
        return 0
    if (num > 0):
        return 1
    if (num < 0):
        return -1

def simplify_angle(angle: float):
    
    return (angle + 2 * math.pi) % (2 * math.pi)

def get_derive(segment: Segment) -> float:
    
    if (segment.start.x == segment.stop.x):
        return None
    
    return (segment.stop.y - segment.start.y) / (segment.stop.x - segment.start.x)

def get_intercept(derive: float, point: Point) -> float:
    
    if (derive is None):
        return None
    
    return point.y - (point.x * derive)

def get_constant(segment: Segment) -> float:
    
    return segment.start.x

def identify(segment: Segment) -> str:
    
    if (segment.start.x == segment.stop.x):
        return VERTICALLY
    return NORMAL

def get_interception(segment1: Segment, segment2: Segment):

    if (identify(segment1) == VERTICALLY and identify(segment2) == VERTICALLY):
        return None

    # because of in matematics world y = 10 is above y = 5 and on a display it is inverted I invert the coordonate
    
    tmp1 = Segment(Point(segment1.start.x, config.MAP_SIZE_Y - segment1.start.y), Point(segment1.stop.x, config.MAP_SIZE_Y - segment1.stop.y))
    tmp2 = Segment(Point(segment2.start.x, config.MAP_SIZE_Y - segment2.start.y), Point(segment2.stop.x, config.MAP_SIZE_Y - segment2.stop.y))
    
    if (identify(segment1) == NORMAL and identify(segment2) == NORMAL):
        
        # representation m * x + p

        m1 = get_derive(tmp1)
        m2 = get_derive(tmp2)
        
        p1 = get_intercept(m1, tmp1.start)
        p2 = get_intercept(m2, tmp2.start)
        
        # m1 * x + p1 = m2 * x + p2
        # m1 * x = m2 * x + p2 -p1
        # m1 * x - m2 * x = p1 - p2
        # x * (m1 - m2) = p1 - p2
        # x = (p1 - p2) / (m1 - m2)
        if (m1 == m2):
            return None
        
        #                                reinvert
        x: float = (p1 - p2) / (m1 - m2) * (-1)
        
        y: float = config.MAP_SIZE_Y - (m1 * x + p1)
        
    else:

        if (identify(tmp1) == VERTICALLY):
            constant: float = get_constant(tmp1)
            m: float = get_derive(tmp2)
            p: float = get_intercept(m, tmp2.start)
        else:
            constant: float = get_constant(tmp2)
            m: float = get_derive(tmp1)
            p: float = get_intercept(m, tmp1.start)
        
        x: float = constant
        y: float = config.MAP_SIZE_Y - (m * x + p)
    
    impact: Point = Point(x, y)
    
    return impact

def get_impact_point(segments: list[Segment], ball: Ball):    
    
    cos: float = round(math.cos(ball.angle), 6)
    sin: float = round(math.sin(ball.angle), 6)
    
    point: Point = Point(ball.position.x + cos, ball.position.y - sin)

    ball_segment = Segment(ball.position, point)

    closest: Point = None

    for segment in segments:

        impact: Point = get_interception(segment, ball_segment)

        if (impact is None):
            continue

        diff_x: float = ball.position.x - impact.x
        if (get_sign(diff_x) == get_sign(cos) and cos != 0):
            continue
        
        diff_y: float = (ball.position.y - impact.y)
        if (get_sign(diff_y) != get_sign(sin) and sin != 0):
            continue
        
        impact.x += (ball.size / 2) * get_sign(cos) * (-1)
        impact.y += (ball.size / 2) * get_sign(sin)

        if (closest is None or impact.distance(ball.position) < closest.distance(ball.position)):
            closest = impact

    return closest
    
async def update_ball(game: Game, impact: Point):
    
    distance: float = impact.distance(game.ball.position)
    
    time_before_impact: float = distance / game.ball.speed
    
    await asyncio.sleep(time_before_impact)
    
    game.ball.angle = game.ball.angle + math.pi
    
    game.ball.position = impact

    await SyncToAsync(game.broadcast)("update_ball", game.ball.to_dict())

async def render(game: Game):
    
    while True:
        
        segments: list[Segment] = [player.rail for player in game.players] + [wall.rail for wall in game.walls]

        impact = get_impact_point(segments, game.ball, )
        
        await update_ball(game, impact)


def routine(game: Game):

    asyncio.run(render(game))

    while True:
        for player in game._updated_players:
            game.broadcast("update_paddle", player.to_dict(), [player])

        game._updated_players.clear()

        sleep(1 / config.SERVER_TPS)