library(testthat)
library(hydflood)

context("flood2")

test_that("flood2: checks", {
    if (Sys.info()["nodename"] == "pvil-rr") {
        # Elbe
        hf <- Sys.getenv("hydflood")
        x <- hydSpatRaster(
            filename_dem = paste0(hf, "/data-raw/raster.dem.tif"),
            filename_csa = paste0(hf, "/data-raw/raster.csa.tif"))
        
        # create a temporal sequence
        seq <- seq(as.Date("2016-12-01"), as.Date("2016-12-31"), by = "day")
        
        # errors
        # x missing
        expect_error(flood2(seq = seq), "The 'x' argument has to be supplied.")
        
        # x class
        expect_error(flood2(x = seq), "'x' must be type 'SpatRaster'")
        
        # seq missing
        expect_error(flood2(x), "The 'seq' argument has to be supplied.")
        
        # seq class
        expect_error(flood2(x, c("a", "b")),
                     "'seq' must be either type 'Date' or c('POSIXct', 'POSIXt",
                     fixed = TRUE)
        
        # seq length
        expect_error(flood2(x, numeric()),
                     "'seq' must have length larger 0.")
        
        # seq NA
        expect_error(flood2(x, as.Date(NA)),
                     "'seq' or elements of it must not be NA.")
        
        # seq range Date
        seq <- seq(as.Date("1958-12-21"), as.Date("1958-12-22"), by = "days")
        expect_error(flood2(x, seq),
                     "'seq' must be between 1960-01-01 and yesterday")
        seq <- seq(as.Date("2050-12-21"), as.Date("2050-12-22"), by = "days")
        expect_error(flood2(x, seq),
                     "'seq' must be between 1960-01-01 and yesterday")
        
        # seq range POSIX
        now <- Sys.time()
        months_ago <- now - 3600 * 24 * 30 * 2
        seq <- c(months_ago - 3600, months_ago - 3600 * 2)
        expect_error(flood2(x, seq),
                     "00:00:00 and now, if type of 'seq' is c('POSIXct', 'POSI",
                     fixed = TRUE)
        seq <- seq(as.Date("2016-12-01"), as.Date("2016-12-31"), by = "day")
        
        # filename length
        expect_error(flood2(x, seq, filename = 1),
                     "'filename' must be type 'character'.")
        expect_error(flood2(x, seq, filename = c("a", "b")),
                     "'filename' must have length 1.")
    }
})


test_that("flood2: Elbe", {
    if (Sys.info()["nodename"] == "pvil-rr") {
        # Elbe
        hf <- Sys.getenv("hydflood")
        x <- hydSpatRaster(
            filename_dem = paste0(hf, "/data-raw/raster.dem.tif"),
            filename_csa = paste0(hf, "/data-raw/raster.csa.tif"))
        
        # create a temporal sequence
        seq <- seq(as.Date("2016-12-01"), as.Date("2016-12-31"), by = "day")
        
        # compute a flood duration
        fd <- flood2(x = x, seq = seq)
        
        expect_equal(class(fd)[1], "SpatRaster")
        expect_equal(minmax(fd)["max",], length(seq))
        expect_equal(minmax(fd)["min",], 0)
    }
})


test_that("flood2: Rhine", {
    if (Sys.info()["nodename"] == "pvil-rr") {
        # Rhine
        hf <- Sys.getenv("hydflood")
        x <- hydSpatRaster(
            filename_dem = paste0(hf, "/data-raw/raster.dem_plittersdorf.tif"),
            filename_csa = paste0(hf, "/data-raw/raster.csa_plittersdorf.tif"))
        
        # create a temporal sequence
        seq <- seq(as.Date("2016-12-01"), as.Date("2016-12-31"), by = "day")
        
        # compute a flood duration
        fd <- flood2(x = x, seq = seq)
        
        expect_equal(class(fd)[1], "SpatRaster")
        expect_equal(minmax(fd)["max",], length(seq))
        expect_equal(minmax(fd)["min",], 0)
    }
})