"""File 05normalMixture_allAlgos.py

:author: Michel Bierlaire, EPFL
:date: Mon Dec 23 15:48:59 2019

 Example of a mixture of logit models, using Monte-Carlo integration.
 Three alternatives: Train, Car and Swissmetro
 SP data
"""
import numpy as np
import pandas as pd
import biogeme.database as db
import biogeme.exceptions as excep
import biogeme.biogeme as bio
import biogeme.models as models
import biogeme.optimization as opt
from biogeme.expressions import Beta, DefineVariable, bioDraws, log, MonteCarlo

import biogeme.hamabs as hamabs

# Read the data
df = pd.read_csv("swissmetro.dat",sep='\t')
database = db.Database("swissmetro",df)

# The Pandas data structure is available as database.data. Use all the
# Pandas functions to invesigate the database
#print(database.data.describe())

# The following statement allows you to use the names of the variable
# as Python variable.
globals().update(database.variables)

# Removing some observations can be done directly using pandas.
#remove = (((database.data.PURPOSE != 1) & (database.data.PURPOSE != 3)) | (database.data.CHOICE == 0))
#database.data.drop(database.data[remove].index,inplace=True)

# Here we use the "biogeme" way for backward compatibility
exclude = (( PURPOSE != 1 ) * (  PURPOSE   !=  3  ) +  ( CHOICE == 0 )) > 0
database.remove(exclude)

# Parameters to be estimated
ASC_CAR = Beta('ASC_CAR',0,None,None,0)
ASC_TRAIN = Beta('ASC_TRAIN',0,None,None,0)
ASC_SM = Beta('ASC_SM',0,None,None,1)
B_TIME = Beta('B_TIME',0,None,None,0)
B_TIME_S = Beta('B_TIME_S',0,None,None,0)
B_COST = Beta('B_COST',0,None,None,0)

# Define a random parameter, normally distributed, designed to be used
# for Monte-Carlo simulation
B_TIME_RND = B_TIME + B_TIME_S * bioDraws('B_TIME_RND','NORMAL')

# Definition of new variables
# If the person has a GA (season ticket) her incremental cost is actually 0 
# rather than the cost value gathered from the
# network data. 
SM_COST =  SM_CO   * (  GA   ==  0  ) 
TRAIN_COST =  TRAIN_CO   * (  GA   ==  0  )

# Definition of new variables: adding columns to the database 
TRAIN_TT_SCALED = DefineVariable('TRAIN_TT_SCALED',\
                                 TRAIN_TT / 100.0,database)
TRAIN_COST_SCALED = DefineVariable('TRAIN_COST_SCALED',\
                                   TRAIN_COST / 100,database)
SM_TT_SCALED = DefineVariable('SM_TT_SCALED', SM_TT / 100.0,database)
SM_COST_SCALED = DefineVariable('SM_COST_SCALED', SM_COST / 100,database)
CAR_TT_SCALED = DefineVariable('CAR_TT_SCALED', CAR_TT / 100,database)
CAR_CO_SCALED = DefineVariable('CAR_CO_SCALED', CAR_CO / 100,database)

# Definition of the utility functions
V1 = ASC_TRAIN + B_TIME_RND * TRAIN_TT_SCALED + B_COST * TRAIN_COST_SCALED
V2 = ASC_SM + B_TIME_RND * SM_TT_SCALED + B_COST * SM_COST_SCALED
V3 = ASC_CAR + B_TIME_RND * CAR_TT_SCALED + B_COST * CAR_CO_SCALED

# Associate utility functions with the numbering of alternatives
V = {1: V1,
     2: V2,
     3: V3}

# Associate the availability conditions with the alternatives
CAR_AV_SP =  DefineVariable('CAR_AV_SP',CAR_AV  * (  SP   !=  0  ),database)
TRAIN_AV_SP =  DefineVariable('TRAIN_AV_SP',TRAIN_AV  * (  SP   !=  0  ),database)
av = {1: TRAIN_AV_SP,
      2: SM_AV,
      3: CAR_AV_SP}

# Conditional to B_TIME_RND, we have a logit model (called the kernel)
prob = models.logit(V,av,CHOICE)

# We integrate over B_TIME_RND using Monte-Carlo
logprob = log(MonteCarlo(prob))

# Define level of verbosity
import biogeme.messaging as msg
logger = msg.bioMessage()
logger.setSilent()
#logger.setWarning()
#logger.setGeneral()
#logger.setDetailed()
#logger.setDebug()

# Create the Biogeme object
biogeme = bio.BIOGEME(database,logprob,numberOfDraws=2000)
biogeme.modelName = '05normalMixture'

#algos={'CFSQP':None,'scipy':opt.scipy,'Line search':opt.newtonLineSearchForBiogeme,'Trust region (cg)':opt.newtonTrustRegionForBiogeme,'LS-BFGS':opt.bfgsLineSearchForBiogeme,'TR-BFGS':opt.bfgsTrustRegionForBiogeme}
#algos={'Line search':opt.newtonLineSearchForBiogeme,'Trust region (cg)':opt.newtonTrustRegionForBiogeme,'LS-BFGS':opt.bfgsLineSearchForBiogeme,'TR-BFGS':opt.bfgsTrustRegionForBiogeme,'HAMABS':hamabs.hamabs}
algos={'HAMABS':hamabs.hamabs,'Trust region (cg)':opt.newtonTrustRegionForBiogeme}

results = {}
for name,algo in algos.items():
    try:
        results[name] = biogeme.estimate(algorithm=algo)
        g = results[name].data.g
        print(f"**** {name:21} {results[name].data.logLike:10.7f} {np.inner(g,g):10.3g} {results[name].data.optimizationTime} {results[name].data.numberOfFunctionEval:4} {results[name].data.optimizationMessage}")
    except excep.biogemeError as err:
        print(f"**** {name:21} Error: {err}")