module main
{
    type philosopher_state_t = enum { THINKING, HUNGRY, EATING };

    var phil1, phil2, phil3, phil4, phil5 : philosopher_state_t;
    var chopstick1, chopstick2, chopstick3, chopstick4, chopstick5 : boolean;

    procedure take_chopsticks(p: philosopher_state_t, left: boolean, right: boolean)
        modifies left;
        modifies right;
    {
        assume(p == HUNGRY && !left && !right);
        left = true;
        right = true;
    }

    procedure release_chopsticks(p: philosopher_state_t, left: boolean, right: boolean)
        modifies left;
        modifies right;
    {
        assume(p == EATING && left && right);
        left = false;
        right = false;
    }

    init {
        phil1 = THINKING; phil2 = THINKING; phil3 = THINKING; phil4 = THINKING; phil5 = THINKING;
        chopstick1 = false; chopstick2 = false; chopstick3 = false; chopstick4 = false; chopstick5 = false;
    }

    next {
        // Philosopher 1
        if (phil1 == HUNGRY && !chopstick5 && !chopstick1) {
            take_chopsticks(phil1, chopstick5, chopstick1);
            phil1 = EATING;
        } else if (phil1 == EATING) {
            release_chopsticks(phil1, chopstick5, chopstick1);
            phil1 = THINKING;
        }

        // Philosopher 2
        // Add similar logic for Philosopher 2

        // Philosopher 3
        // Add similar logic for Philosopher 3

        // Philosopher 4
        // Add similar logic for Philosopher 4

        // Philosopher 5
        // Add similar logic for Philosopher 5
    }

    property deadlock_possible {
        deadlock {
            phil1 == HUNGRY && phil2 == HUNGRY && phil3 == HUNGRY && phil4 == HUNGRY && phil5 == HUNGRY &&
            chopstick1 && chopstick2 && chopstick3 && chopstick4 && chopstick5
        }
    }
}
