from ..components import info
import pygame
from .. import  tools, setup
from .. import constants as C
from .. components import player
import os
import json

class Level:
    def __init__(self):
        self.finished = False
        self.next = None
        self.info = info.Info('level')
        self.load_map_data()
        self.setup_background()
        self.setup_start_positions()
        self.setup_player()

    def load_map_data(self):
        file_name = 'level_1.json'
        file_path = os.path.join('source/data/maps',file_name)
        with open(file_path) as f:
            self.map_data = json.load(f)


    def setup_background(self):
        self.image_name = self.map_data['image_name']
        self.background = setup.GRAPHICS[self.image_name]
        rect = self.background.get_rect()
        self.background = pygame.transform.scale(self.background,(int(rect.width * C.BG_MULTI),
                                                                       int(rect.height * C.BG_MULTI)))
        self.background_rect = self.background.get_rect()
        self.game_window = setup.SCREEN.get_rect()
        self.game_ground = pygame.Surface((self.background_rect.width,self.background_rect.height))


    def setup_start_positions(self):
        self.positions = []
        for data in self.map_data['maps']:
            self.positions.append((data['start_x'],data['end_x'],data['player_x'],data['player_y']))
        self.start_x,self.end_x,self.player_x,self.player_y = self.positions[0]


    def setup_player(self):
        self.player = player.Player('mario')
        self.player.rect.x = self.game_window.x + self.player_x
        self.player.rect.bottom = self.player_y


    def update(self, surface, keys):
        self.player.update(keys)
        self.update_player_position()
        self.update_game_window()
        self.draw(surface)


    def update_player_position(self):
        self.player.rect.x += self.player.x_vel
        if self.player.rect.x < self.start_x:
            self.player.rect.x = self.start_x
        elif self.player.rect.right > self.end_x:
            self.player.rect.right = self.end_x
        self.player.rect.y += self.player.y_vel

    def update_game_window(self):
        third = self.game_window.x + self.game_window.width/3
        if self.player.x_vel > 0 and self.player.rect.centerx > third  and self.game_window.right < self.end_x:  # 判断移动
            self.game_window.x += self.player.x_vel   # 用窗口更新代替主角移动
            self.start_x = self.game_window.x

    def draw(self, surface):
        self.game_ground.blit(self.background,self.game_window,self.game_window)
        self.game_ground.blit(self.player.image,self.player.rect)     # 将背景与人物化境
        surface.blit(self.game_ground,(0,0), self.game_window)   # 渲染
        self.info.draw(surface)