import random

import pygame

from common.constants import ROWS, COLUMNS, GRID_CELL_PADDING, GRID_CELL_WIDTH, GRID_CELL_HEIGHT, BORDER_WIDTH, \
    BORDER_RADIUS
from .field import Field


class Grid:
    def __init__(self, textures):
        self.textures = textures
        self.grid = []
        self.free_fields = []
        self.busy_fields = []
        for row in range(ROWS):
            self.grid.append(pygame.sprite.Group())
            for column in range(COLUMNS):
                box_rect = [(GRID_CELL_PADDING + GRID_CELL_WIDTH) * column + GRID_CELL_PADDING + 7,
                            (GRID_CELL_PADDING + GRID_CELL_HEIGHT) * row + GRID_CELL_PADDING + 7,
                            GRID_CELL_WIDTH,
                            GRID_CELL_HEIGHT]
                texture_path, converted_texture = self.get_random_texture()
                field = Field(
                    texture_path,
                    converted_texture,
                    pygame.transform.scale(converted_texture,
                                           (GRID_CELL_WIDTH,
                                            GRID_CELL_HEIGHT)),
                    pygame.Rect(box_rect),
                    row=row,
                    column=column
                )
                if field.busy:
                    self.busy_fields.append(field)
                else:
                    self.free_fields.append(field)

                self.grid[row].add(field)

    def update(self, screen):
        self.draw(screen)

    def get_random_texture(self):
        texture_index = random.randint(0, len(self.textures) - 1)
        return self.textures[texture_index]

    def draw(self, screen):
        bg_width = (GRID_CELL_PADDING + GRID_CELL_WIDTH) * COLUMNS + BORDER_WIDTH
        bg_height = (GRID_CELL_PADDING + GRID_CELL_HEIGHT) * ROWS + BORDER_WIDTH
        pygame.draw.rect(screen, (255, 255, 255), pygame.Rect(5, 5, bg_width, bg_height), 0, BORDER_RADIUS)

        for fields_row in self.grid:
            fields_row.draw(screen)