from otree.api import *


doc = """
Simple trust game
"""


class Constants(BaseConstants):
    name_in_url = 'trust'
    players_per_group = 2
    num_rounds = 1
    endowment = cu(10)
    multiplier = 3
    instructions_template = 'trust/instructions.html'


class Subsession(BaseSubsession):
    pass


class Group(BaseGroup):
    sent_amount = models.CurrencyField(
        min=cu(0), max=Constants.endowment, doc="""Amount sent by P1"""
    )
    sent_back_amount = models.CurrencyField(doc="""Amount sent back by P2""")


class Player(BasePlayer):
    pass


# FUNCTIONS
def sent_back_amount_choices(group: Group):
    return currency_range(cu(0), group.sent_amount * Constants.multiplier, cu(1))


def set_payoffs(group: Group):
    p1 = group.get_player_by_id(1)
    p2 = group.get_player_by_id(2)
    p1.payoff = Constants.endowment - group.sent_amount + group.sent_back_amount
    p2.payoff = group.sent_amount * Constants.multiplier - group.sent_back_amount


# PAGES
class Send(Page):
    form_model = 'group'
    form_fields = ['sent_amount']

    @staticmethod
    def is_displayed(player: Player):
        return player.id_in_group == 1


class Introduction(Page):
    @staticmethod
    def is_displayed(player: Player):
        return player.round_number == 1


class WaitForP1(WaitPage):
    pass


class SendBack(Page):
    form_model = 'group'
    form_fields = ['sent_back_amount']

    @staticmethod
    def is_displayed(player: Player):
        return player.id_in_group == 2

    @staticmethod
    def vars_for_template(player: Player):
        return dict(tripled_amount=player.group.sent_amount * Constants.multiplier)


class ResultsWaitPage(WaitPage):
    after_all_players_arrive = set_payoffs


class Results(Page):
    pass


page_sequence = [Introduction, Send, WaitForP1, SendBack, ResultsWaitPage, Results]