context("Check that forecasters behave as expected")

ts_data = system.file("testdata","ts_test.csv",package="talweg")
exo_data = system.file("testdata","exo_test.csv",package="talweg")
data00 <<- getData(ts_data, exo_data, input_tz="GMT", date_format="%Y-%m-%d %H:%M",
	working_tz="GMT", predict_at=0, limit=Inf)
data13 <<- getData(ts_data, exo_data, input_tz="GMT", date_format="%Y-%m-%d %H:%M",
	working_tz="GMT", predict_at=13, limit=Inf)
#Forecast at sunday to saturday (series 7 to 1), for monday to sunday (series 1 to 7)
indices <<- seq(as.Date("2007-04-01"),as.Date("2007-04-07"),"days")
pred_order = c(7,1:6) #will facilitate tests

test_that("Average method behave as expected",
{
	pred00_z = getForecast(data00, indices, "Average", "Zero",        Inf, 24)
	pred00_p = getForecast(data00, indices, "Average", "Persistence", Inf, 24)
	for (i in seq_along(indices))
	{
		#zero jump: should predict true values minus 1
		expect_equal(pred00_z$getSerie(i), rep(pred_order[i],24))
		#persistence jump == 1: should predict true values
		expect_equal(pred00_p$getSerie(i), rep(i,24))
	}

	#NOTE: days become
	#1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 (14h-->0h then 1h-->13h)
	#No jump between days, thus zero and persistence are equivalent (and wrong)
	pred13_z = getForecast(data13, indices, "Average", "Zero",        Inf, 24)
	pred13_p = getForecast(data13, indices, "Average", "Persistence", Inf, 24)
	prediction = c(rep(-13/24,11),rep(11/24,13))
	for (i in seq_along(indices))
	{
		expect_equal(pred13_z$getSerie(i), prediction ) ##TODO: prendre en compte recollement
		expect_equal(pred13_p$getSerie(i), prediction )
	}

	#A few extra checks
	expect_identical( pred00_sd$getIndexInData(1), dateIndexToInteger("2007-04-01",data00) )
	expect_identical( pred13_dd$getIndexInData(3), dateIndexToInteger("2007-04-03",data13) )
	expect_identical( pred00_dd$getIndexInData(5), dateIndexToInteger("2007-04-05",data00) )
})

test_that("Persistence method behave as expected",
{
	#Situation A: +Zero; always wrong
	pred00_sd = getForecast(data00, indices, "Persistence", "Zero", Inf, 24, same_day=TRUE)
	pred00_dd = getForecast(data00, indices, "Persistence", "Zero", Inf, 24, same_day=FALSE)
	for (i in seq_along(indices))
	{
		expect_identical(pred00_sd$getSerie(i), rep(i,24))
		expect_identical(pred00_dd$getSerie(i), rep(i,24))
	}

	pred13_sd = getForecast(data13, indices, "Persistence", "Zero", Inf, 24, same_day=TRUE)
	pred13_dd = getForecast(data13, indices, "Persistence", "Zero", Inf, 24, same_day=FALSE)
	for (i in seq_along(indices))
	{
		expect_identical(pred13_sd$getSerie(i), c( rep(i,11), rep(i%%7+1,13) ) )
		expect_identical(pred13_dd$getSerie(i), c( rep(i,11), rep(i%%7+1,13) ) )
	}

	#Situation B: +Persistence, correct when predict_at==0
	pred00_sd = getForecast(data00, indices, "Persistence", "Persistence", Inf, 24, same_day=TRUE)
	pred00_dd = getForecast(data00, indices, "Persistence", "Persistence", Inf, 24, same_day=FALSE)
	for (i in seq_along(indices))
	{
		expect_identical(pred00_sd$getSerie(i), rep(i%%7+1,24))
		expect_identical(pred00_dd$getSerie(i), rep(i%%7+1,24))
	}

	pred13_sd = getForecast(data13, indices, "Persistence", "Persistence", Inf, 24, same_day=TRUE)
	pred13_dd = getForecast(data13, indices, "Persistence", "Persistence", Inf, 24, same_day=FALSE)
	for (i in seq_along(indices))
	{
		expect_identical(pred13_sd$getSerie(i), c( rep(i,11), rep(i%%7+1,13) ) )
		expect_identical(pred13_dd$getSerie(i), c( rep(i,11), rep(i%%7+1,13) ) )
	}

	#A few extra checks
	expect_identical( pred13_sd$getIndexInData(1), dateIndexToInteger("2007-04-01",data12) )
	expect_identical( pred00_dd$getIndexInData(3), dateIndexToInteger("2007-04-03",data00) )
	expect_identical( pred13_dd$getIndexInData(5), dateIndexToInteger("2007-04-05",data13) )
})

test_that("Neighbors+Zero method behave as expected",
{
})

test_that("Neighbors+Neighbors method behave as expected",
{
})