dust/examples/clue_solver.ds

all_cards = {
	rooms = ['Library' 'Kitchen' 'Conservatory']
	suspects = ['White' 'Green' 'Scarlett']
	weapons = ['Rope' 'Lead_Pipe' 'Knife']
}

is_ready_to_solve = |cards| => {
	((length cards:suspects) == 1)
	&& ((length cards:rooms) == 1)
	&& ((length cards:weapons) == 1)
}

take_turn = |opponent_card, current_room, cards| => {
	(remove_card opponent_card cards)
	(make_guess current_room cards)
	cards
} 

remove_card = |opponent_card cards| => {
	remove card from cards:rooms {
		card == opponent_card
	}
	remove card from cards:weapons {
		card == opponent_card
	}
	remove card from cards:suspects {
		card == opponent_card
	}
}

make_guess = |current_room cards| => {
	if (is_ready_to_solve cards) {
		(output 'It was '
			+ cards:suspects:0
			+ ' in the ' 
			+ cards:rooms:0  
			+ ' with the ' 
			+ cards:weapons:0 
			+ '!')
	} else {
		(output 'I accuse '
			+ (random cards:suspects)
			+ ' in the '
			+ current_room
			+ ' with the '
			+ (random cards:weapons)
			+ '!')
	}
}

(take_turn 'Rope' 'Kitchen'
	(take_turn 'Library' 'Kitchen'
		(take_turn 'Conservatory' 'Kitchen'
			(take_turn 'White' 'Kitchen'
				(take_turn 'Green' 'Kitchen'
					(take_turn 'Knife' 'Kitchen' all_cards))))))