# coding=utf-8

# Hint.instantiate takes a hint object (dictionary) to be sent to the client
# and sets additional fields based on previously sent hints.

# Simple hint: don't do anything.
class Hint(object):
    def __init__(self, name):
        self.name = name

    def instantiate(self, hint, prev_hints):
        pass

# Hint sequence: each time this hint is sent, increase the message index until
# the last message is reached, then repeat that.
class HintSequence(Hint):
    def __init__(self, name, length):
        self.name = name
        self.length = length

    def instantiate(self, hint, prev_hints):
        index = 0
        for prev_hint in prev_hints:
            if prev_hint['id'] == self.name:
                index = max(index, prev_hint['indices'][0]+1)
        index = min(index, self.length-1)
        hint['indices'] = [index]