################################################################################

test_that("can use SFBMs from old versions", {

  spmat <- Matrix::sparseMatrix(1, 2, x = 3, dims = c(3, 3))
  # X0 <- bigsparser::as_SFBM(spmat, "inst/testdata/old_sfbm")
  # saveRDS(X0, "tests/testthat/testdata/old_sfbm.rds", version = 2)
  test_file <- test_path("testdata/old_sfbm.rds")
  X <- readRDS(test_file)
  X$backingfile <- sub("\\.rds$", ".sbk", test_file)
  expect_false(identical(X$address, methods::new("externalptr")))
  expect_identical(sp_prodVec(X, rep(1, 3)), c(3, 0, 0))
})

################################################################################

test_that("internal function work properly", {

  spmat <- Matrix::Diagonal(4, 0:3)
  spmat[4, 2] <- 5
  spmat[1, 4] <- 6
  spmat[3, 4] <- 7

  col_range <- bigsparser:::range_col(spmat@p, spmat@i)
  expect_equal(col_range, list(c(-1, 1, 2, 0), c(-2, 3, 2, 3)))

  first_i_  <- col_range[[1]]
  col_count <- col_range[[2]] - first_i_ + 1L

  tmp <- rmio::file_create(tempfile(), 8 * sum(col_count))

  new_p <- bigsparser:::write_val_compact(
    tmp, spmat@p, spmat@i, spmat@x,
    first_i_, col_count, offset_p = 0, symmetric = FALSE)
  expect_equal(new_p, c(0, 0, 3, 4, 8))

  expect_identical(readBin(tmp, what = 1, n = 100),
                   c(1, 0, 5, 2, 6, 0, 7, 3))


  (spmat2 <- Matrix::forceSymmetric(spmat))

  col_range2 <- bigsparser:::range_col_sym(spmat2@p, spmat2@i)
  expect_equal(col_range2, list(c(3, 1, 2, 0), c(3, 1, 3, 3)))

  first_i_2  <- col_range2[[1]]
  col_count2 <- col_range2[[2]] - first_i_2 + 1L
  expect_equal(col_count2, c(1, 1, 2, 4))

  tmp2 <- rmio::file_create(tempfile(), 8 * sum(col_count2))

  new_p2 <- bigsparser:::write_val_compact(
    tmp2, spmat2@p, spmat2@i, spmat2@x,
    first_i_2, col_count2, offset_p = 0, symmetric = TRUE)
  expect_equal(new_p2, c(0, 1, 2, 4, 8))

  expect_identical(readBin(tmp2, what = 1, n = 100),
                   c(6, 1, 2, 7, 6, 0, 7, 3))

  COL_RANGE <- function(x) {
    ind <- which(x != 0)
    `if`(length(ind) > 0, range(ind) - 1L, c(-1, -2))
  }
  spmat <- Matrix::rsparsematrix(1000, 1000, 0.001)
  test5 <- bigsparser:::range_col(spmat@p, spmat@i)
  expect_equal(do.call("rbind", test5), apply(spmat, 2, COL_RANGE))

  spmat2 <- Matrix::rsparsematrix(1000, 1000, 0.001, symmetric = TRUE)
  test6 <- bigsparser:::range_col_sym(spmat2@p, spmat2@i)
  expect_equal(do.call("rbind", test6), apply(spmat2, 2, COL_RANGE))
})

################################################################################

test_that("can create an SFBM_compact from a dgCMatrix", {

  spmat <- Matrix::rsparsematrix(1000, 1000, 0.01)
  X <- as_SFBM(spmat, compact = TRUE)
  expect_true(all(X$p >= spmat@p))
  expect_equal(dim(X), spmat@Dim)

  expect_false(X$is_saved)
  X <- X$save()
  expect_true(X$is_saved)
  X2 <- readRDS(X$rds)
  expect_equal(X2$p, X$p)
  expect_equal(X2$sbk, X$sbk)
})

################################################################################

test_that("can create an SFBM_compact from a dsCMatrix", {

  spmat0 <- Matrix::rsparsematrix(1000, 1000, 0.01, symmetric = TRUE)
  X <- as_SFBM(spmat0, compact = TRUE)
  spmat <- as(spmat0, "dgCMatrix")
  X2 <- as_SFBM(spmat, compact = TRUE)
  expect_identical(readBin(X$sbk,  what = 1, n = 1e6),
                   readBin(X2$sbk, what = 1, n = 1e6))
  expect_equal(X$p, X2$p)
  expect_equal(dim(X),  spmat@Dim)
  expect_equal(dim(X2), spmat@Dim)
})

################################################################################

test_that("products between an SFBM_compact and a vector work", {

  spmat <- Matrix::rsparsematrix(1000, 1000, 0.1)
  X <- as_SFBM(spmat, compact = TRUE)
  y <- runif(1000)
  expect_equal(sp_prodVec(X, y), as.vector(spmat %*% y))
  expect_equal(sp_cprodVec(X, y), as.vector(Matrix::crossprod(spmat, y)))
})

################################################################################