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# directions = {
#     '>': 1,
#     '<': -1
# }



def parse_directions():
    return open("puzzle_input.txt").read()


def resize_grid(grid: list[str], rock: list[str]):
    # highest = 0
    # for line in grid:
    #     r = line.find('#')
    #     if r != -1:
    #         highest += 1
    #     else:
    #         break
    
    rock_height = len(rock)
    space_between = [['.'] * width] * 3

    grid.insert(rock_height-1,space_between )







def insert_rock(rock, grid, width):
   
    for i, line in enumerate(rock):
        grid.insert(i, ['.'] * 2 + list(line) + ["."] * (width - len(line) - 2))
    
    # resize_grid(grid, rock)
    rock_height = len(rock)
    space_between = ['.'] * width

    for _ in range(3):
        grid.insert(rock_height,space_between)


def next_idx(lst:list, curr_idx:int):
    return curr_idx + 1 if curr_idx < len(lst) - 1 else 0

def print_grid(grid):
    print("-------")
    for line in grid:
        print("".join(line))


def shift_block(grid:list[str], dir: tuple[int,int]):
  

    dx, dy = dir
    positions = []
    for y in range(len(grid)):
        for x in range(len(grid[0])):
            if grid[y][x] == '@':
                positions.append((x, y))


    new_positions = [(x, y+1) for x, y in positions]

    for x, y in positions: # remove block
        grid[y][x] = '.'
    
   
    for x, y in new_positions: # build shifted block
        grid[y][x] = '@'

    print_grid(grid)
    print(new_positions)
            
    return grid
    
    

    # shifted = [row[:] for row in grid]  # Create a new list and copy the values from grid into it
    # rows = len(grid)
    # cols = len(grid[0])
    # dx, dy = dir
   
    # for i in range(rows):
    #     for j in range(cols):
    #         char = shifted[i][j]
    #         if char == '@':
    #             if (i + dy < 0 or j + dx < 0 or i + dy >= rows or j + dx >= cols):  # hit border
    #                 print("hit border!")
                    
    #                 return grid

    #             if grid[i+dy][j+dx] == '#':
    #                 print("hit other rock!")
    #                 return grid

    #             # Shift the block of '@' characters
    #             shifted[i+dy][j+dx] = '@'

                
                
    #             if grid[i+dy][j+dx] == '.':
                    
    #                 break
    #             else:
    #                 shifted[i][j] = '.'
                
                

    # print(shifted)
    # return shifted

    # match dir:
    #     case 1:
    #         shifted = [row[-1] + row[:-1] for row in grid]
    #     case -1:
    #         shifted = [row[1:] + row[0] for row in grid]
    #     case _:
    #         shifted = [grid[(i - 1) % len(grid)] for i in range(len(grid))]

    # return shifted




def simulate(rock_types, dirs, max_rocks, width):

    grid = []
    rock_count = 0
    dir_idx = 0
    rock_idx = 0

    while rock_count < max_rocks: # while 
        rock = rock_types[rock_idx]
        rock_idx = next_idx(rock_types, rock_idx)
        rock_count += 1


        insert_rock(rock, grid, width)
        print_grid(grid)
        grid = shift_block(grid, (0,1))      
        print_grid(grid)

        return []


        rest = False
        while not rest: # while rock hasnt stopped moving
            
            dir = 1 if dirs[dir_idx] == '>' else -1 
            dir_idx = next_idx(dirs, dir_idx)

            # column_idx = 0 if dir == -1 else -1
            # lateral_col = [grid[row][column_idx] for row in range(len(grid))]
            # can_move_side = all(x == '.' for x in lateral_col)

            grid = shift_block(grid, 1,0)
            
            print_grid(grid)
            return
            # if rest, turn @ to # and break
            # else continue


    return rock_count