from otree.api import *
import os

# -------------------
# Constants
# -------------------
class C(BaseConstants):
    NAME_IN_URL = 'instructions'
    PLAYERS_PER_GROUP = None
    NUM_ROUNDS = 22

# -------------------
# Group / Player / Subsession
# -------------------
class Group(BaseGroup):
    pass

class Player(BasePlayer):
    pass

class Subsession(BaseSubsession):
    pass 

# -------------------
# Pages
# -------------------
class Start(Page):
    @staticmethod
    def is_displayed(player):
        return player.round_number == 1
    
class Consent(Page):
    @staticmethod
    def is_displayed(player):
        return player.round_number == 1
    
class Instructions(Page):
    allow_back_button = True

    @staticmethod
    def vars_for_template(player: Player):
        round_number = player.round_number
        image_path = f"instructions/FVY2 Instructions-20_Page_{round_number}.png"
        return dict(
            round_number=round_number,
            image_path=image_path,
            max_rounds=C.NUM_ROUNDS,
        )

# Page sequence
# -------------------
page_sequence = [Start, Consent, Instructions]