from random import randrange
from typing import List

import numpy as np
import numpy.typing as npt

from common import Position
from const import *


class Genome:
    grid: npt.NDArray
    knights_red: List[Position]
    knights_blue: List[Position]
    waters: List[Position]
    trees: List[Position]
    sands: List[Position]
    monsters: List[Position]

    def __init__(self):
        self.grid = np.zeros((ROWS, COLUMNS), dtype=int)

        # todo: spawning castle, monsters, sand, trees in the same way as bellow
        self.knights_red = spawn_objects_in_given_area(
            grid=self.grid,
            object_alias=MAP_ALIASES.get("KNIGHT_RED"),
            objects_count=KNIGHTS_PER_TEAM_COUNT,
            spawn_position_start=Position(row=LEFT_KNIGHTS_SPAWN_FIRST_ROW, col=LEFT_KNIGHTS_SPAWN_FIRST_COL),
            width=KNIGHTS_SPAWN_WIDTH,
            height=KNIGHTS_SPAWN_HEIGHT
        )

        self.knights_blue = spawn_objects_in_given_area(
            grid=self.grid,
            object_alias=MAP_ALIASES.get("KNIGHT_BLUE"),
            objects_count=KNIGHTS_PER_TEAM_COUNT,
            spawn_position_start=Position(row=RIGHT_KNIGHTS_SPAWN_FIRST_ROW, col=RIGHT_KNIGHTS_SPAWN_FIRST_COL),
            width=KNIGHTS_SPAWN_WIDTH,
            height=KNIGHTS_SPAWN_HEIGHT
        )

        spawn_objects_in_given_area(
            grid=self.grid,
            object_alias=MAP_ALIASES.get("CASTLE"),
            objects_count=4,
            spawn_position_start=Position(row=7, col=9),
            width=2,
            height=2
        )

        self.waters = spawn_objects_in_given_area(grid=self.grid, object_alias=MAP_ALIASES.get("WATER"),
                                                  objects_count=WATER_COUNT)
        self.trees = spawn_objects_in_given_area(grid=self.grid, object_alias=MAP_ALIASES.get("TREE"),
                                                 objects_count=TREE_COUNT)
        self.sands = spawn_objects_in_given_area(grid=self.grid, object_alias=MAP_ALIASES.get("SAND"),
                                                 objects_count=SAND_COUNT)
        self.monsters = spawn_objects_in_given_area(grid=self.grid, object_alias=MAP_ALIASES.get("MONSTER"),
                                                    objects_count=MONSTERS_COUNT)


def is_empty(grid: npt.NDArray, position: Position) -> bool:
    return grid[position.row, position.col] in [MAP_ALIASES.get("GRASS"), MAP_ALIASES.get("SAND")]


def is_invalid_area(spawn_position_start, height, width) -> bool:
    return spawn_position_start.row + height - 1 < 0 or \
           spawn_position_start.row + height - 1 >= ROWS or \
           spawn_position_start.col + width - 1 < 0 or \
           spawn_position_start.col + width - 1 >= COLUMNS


def spawn_objects_in_given_area(grid: npt.NDArray,
                                object_alias: str,
                                objects_count: int = 1,
                                spawn_position_start: Position = Position(row=0, col=0),
                                width: int = COLUMNS,
                                height: int = ROWS) -> List[Position]:
    if is_invalid_area(spawn_position_start, height, width):
        raise ValueError("Invalid spawn area")

    objects_remaining = int(objects_count)
    positions = []

    while objects_remaining > 0:
        row = randrange(spawn_position_start.row, spawn_position_start.row + height)
        col = randrange(spawn_position_start.col, spawn_position_start.col + width)
        position = Position(row=row, col=col)

        if is_empty(grid=grid, position=position):
            grid[position.row, position.col] = object_alias
            positions.append(position)
            objects_remaining -= 1

    return positions