"""File spec_swissmetro.py

Michel Bierlaire, EPFL
Mon Aug 04 2025, 10:04:53

"""

from biogeme.expressions import Beta

from variables_swissmetro import (
    CAR_AV,
    CAR_COST_SCALED,
    CAR_TT_SCALED,
    SM_AV,
    SM_COST_SCALED,
    SM_TT_SCALED,
    TRAIN_AV,
    TRAIN_COST_SCALED,
    TRAIN_TT_SCALED,
)

asc_car = Beta('asc_car', 0, None, None, 0)
asc_train = Beta('asc_train', 0, None, None, 0)
b_time = Beta('b_time', 0, None, None, 0)
b_cost = Beta('b_cost', 0, None, None, 0)

# Definition of the utility functions
v_train = asc_train + b_time * TRAIN_TT_SCALED + b_cost * TRAIN_COST_SCALED
v_swissmetro = b_time * SM_TT_SCALED + b_cost * SM_COST_SCALED
v_car = asc_car + b_time * CAR_TT_SCALED + b_cost * CAR_COST_SCALED


# Associate utility functions with the numbering of alternatives
v = {1: v_train, 2: v_swissmetro, 3: v_car}

# Associate the availability conditions with the alternatives
av = {1: TRAIN_AV, 2: SM_AV, 3: CAR_AV}