context ("add-surface")

test_that ("basemap", {
    expect_error (add_osm_surface (), "a non-null map must be provided")
    expect_error (add_osm_surface (NULL), "map must be a ggplot2 object")
})

test_that ("obj", {
    bbox <- get_bbox (c (-0.13, 51.5, -0.11, 51.52))
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_error (add_osm_surface (map), "obj must be provided")
    expect_error (
        add_osm_surface (map, NULL),
        "obj must be a spatial object"
    )
})

test_that ("add surface", {
    bbox <- get_bbox (c (-0.13, 51.5, -0.11, 51.52))
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    obj <- london$dat_BNR
    expect_error (add_osm_surface (map, obj), "dat can not be NULL")
    expect_error (
        add_osm_surface (map, obj, NULL),
        "'data' must be of a vector type, was 'NULL'"
    )
    expect_error (
        add_osm_surface (map, obj, 1),
        "dat must have at least 3 columns"
    )
    dat <- matrix (runif (12), nrow = 4)
    expect_warning (
        add_osm_surface (map, obj, dat),
        "dat has no column names"
    )
    colnames (dat) <- c ("a", "b", "z")
    expect_warning (
        add_osm_surface (map, obj, dat),
        "dat should have columns of x/y"
    )
    colnames (dat) <- c ("x", "y", "a")
    expect_warning (
        add_osm_surface (map, obj, dat),
        "dat should have column named z"
    )

    bbdat <- get_bbox (c (-0.128, 51.502, -0.112, 51.518))
    x <- seq (bbdat [1, 1], bbdat [1, 2], length.out = dim (volcano) [1])
    y <- seq (bbdat [2, 1], bbdat [2, 2], length.out = dim (volcano) [2])
    xy <- cbind (
        rep (x, dim (volcano) [2]),
        rep (y, each = dim (volcano) [1])
    )
    z <- as.numeric (volcano)
    dat <- data.frame (x = xy [, 1], y = xy [, 2], z = z)
    cols <- gray (0:50 / 50)

    # polygons---------------------------------
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_BNR,
        dat = dat, cols = cols
    ))
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_BNR,
        dat = dat, cols = cols,
        bg = "orange"
    ))

    # lines------------------------------------
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_H,
        dat = dat, cols = cols
    ))
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_H,
        dat = dat, cols = cols,
        bg = "orange"
    ))

    # points-----------------------------------
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_T,
        dat = dat,
        cols = cols
    ))
    map <- osm_basemap (bbox = bbox, bg = "gray20")
    expect_silent (map <- add_osm_surface (map,
        obj = london$dat_T,
        dat = dat,
        cols = cols, bg = "orange"
    ))
})