context("dutils")

test_that("dsort", {
    data("hubble",package="lava")
    expect_equivalent(order(dsort(hubble, ~sigma)$sigma),
                      seq_len(nrow(hubble)))
})

test_that("dsort", {
    data("hubble",package="lava")
    h1 <- hubble
    drename(h1,fun=toupper) <- ~.    
    expect_equivalent(colnames(h1),toupper(names(hubble)))
})


test_that("daggregate", {    
    dd <- data.frame(a=1:20,b=20:1,
                    g1=rep(0:1,10),
                    g2=rep(0:1,each=10),
                    g3=rbinom(20,1,0.5))
    dd$g1[1:2] <- NA
    dd$g2[2:3] <- NA
    dd$a[3:7] <- NA
    ##dcor(dd,.~g1+g2)

    r1 <- dcor(dd, "[acg][12]*$", regex=TRUE, use="pairwise")
    r2 <- cor(dd[,c("a","g1","g2")], use="pairwise")
    expect_equal(norm(r1-r2), 0)
    r1 <- dcor(dd, "[ab]",subset=is.na(g1), regex=TRUE, use="pairwise")
    dd0 <- subset(dd, is.na(g1))
    r2 <- cor(dd[, c("a","b")], use="pairwise")
    expect_equal(norm(r1-r2), 0)
    suppressWarnings(r1 <- dcor(dd, ~.|is.na(g1)|is.na(g2))) # do not warn about zero sd
    dd0 <- subset(dd, is.na(g1) | is.na(g2), select=-c(g1,g2))
    suppressWarnings(r2 <- dcor(dd0)) # do not warn about zero sd
    expect_equal(r1,r2)
    r1 <- dcor(dd, use="pairwise")
    expect_equal(norm(r1-cor(dd, use="pairwise")), 0)
})

test_that("dby", {
    dd <- dby2(iris, . ~ Species, mean, median, REDUCE=T)
    val <- dreshape(dd,varying=list(mean="mean*",median="median*"),dropid=TRUE)
    val$num <- gsub("mean.","",val$num)

    val <- dreshape(dd,varying=c("mean","median"),dropid=TRUE)
    val$num <- gsub("^.","",val$num)
    
    expect_true(ncol(val)==4)
    expect_true(nrow(val)==3*4)
    val0 <- subset(val, Species=="setosa" & num=="Sepal.Width")
    val1 <- subset(iris, Species=="setosa", select="Sepal.Width")[,1]
    expect_true(abs(val0[1,"mean"]-mean(val1))<1e-16)
    expect_true(abs(val0[1,"median"]-median(val1))<1e-16)
})

test_that("dsample", {
    n <- 10
    d <- data.frame(id=rep(0:1,5),x=seq(0,1,length.out=10),y=seq(1,0,length.out=10),
                   id2=rep(1:5,each=2))
    d1 <- dsample(d, ~id, size=3)
    expect_true(ncol(d1)==5)
    expect_true(nrow(d1)==15)

    d2 <- dsample(d, .~id|x>0.5, size=3)
    expect_true(ncol(d2)==4)
    expect_true(all(d2$x>0))
    
    d3 <- dsample(d, .~id+id2, size=3)
    expect_true(ncol(d3)==3)

    d4 <- dsample(d, .~id+id2|x>0, size=3)
    expect_true(ncol(d4)==3)
    expect_true(all(d4$x>0))

    
})