import agent as ag
import project_constants as const
import tile as tl
from mine_models import standard_mine as sm
from mine_models import time_mine as tm
from mine_models import chained_mine as cm
import json_generator as jg


class Minefield:
    def __init__(self, json_path):
        self.turn = 0

        self.agent = ag.Agent(const.MAP_RANDOM_10x10)

        # open JSON with minefield info
        json_gen = jg.JsonGenerator()
        json_gen.load_from_a_file(json_path)

        # create matrix of a desired size, fill it with default tile objects
        self.matrix = [
            [
                tl.Tile(
                    (row, column),
                    terrain_type=json_gen.get_tile((row, column))["terrain"],
                    mine=jg.create_a_mine(json_gen.get_mine((row, column)), (row, column))
                ) for column in range(const.V_GRID_HOR_TILES)
            ] for row in range(const.V_GRID_VER_TILES)
        ]

        # iterate through chained mines, set mine predecessors
        for pair in jg.get_chained_mine_and_its_predecessor_pairs(json_gen.get_grid()):
            successor_position, predecessor_position = pair
            successor_row, successor_column = successor_position
            predecessor_row, predecessor_column = predecessor_position

            predecessor = self.matrix[predecessor_row][predecessor_column]
            self.matrix[successor_row][successor_column].mine.predecessor = predecessor

    # ================ #
    # === MOVEMENT === #
    # ================ #

    # check if sapper's destination is accessible
    # If Agent comes upon a tile with a mine his starting position shall be reestablished
    def is_valid_move(self, target_row: int, target_column: int):
        if 0 <= target_row < const.V_GRID_VER_TILES \
                and 0 <= target_column < const.V_GRID_HOR_TILES \
                and self.matrix[target_row][target_column].mine is None:
            return True

        return False

    # distinguishes new mine's type and creates appropriate object
    def _create_mine(self, mine_data, row, column):
        mine_type = mine_data["mine_type"]

        # TIME MINE
        if mine_type == "time":
            timer = mine_data["timer"]
            mine = tm.TimeMine((row, column), int(timer))

        # CHAINED MINE
        elif mine_type == "chained":
            if mine_data["predecessor"] is not None:
                # locate predecessor
                row, column = map(int, mine_data["predecessor"].split(','))

                # get predecessor object and assign it to the new mine
                predecessor = self.matrix[row][column].mine
                mine = cm.ChainedMine((row, column), predecessor)

            else:
                mine = cm.ChainedMine((row, column))

        # STANDARD MINE
        else:
            mine = sm.StandardMine((row, column))

        return mine