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open OUnit2

module Option = Tools.Option

let u = UTF8.from_utf8string

let _msg ~expected ~result = begin

  let get_string v = match v with
  | None -> "Undefined"
  | Some x -> UTF8.raw_encode @@ ScTypes.Result.show x
  in

    Printf.sprintf "Expected %s but got %s"
    (get_string expected)
    (get_string result)
end

let build_num value = ScTypes.number (
  DataType.Num.of_num @@ Num.num_of_int value
)

(** Test a simple references between two cells *)
let test_create_ref_1 ctx = begin

  let s = Sheet.Raw.empty
       |> Sheet.Raw.add (3,3) @@ Expression.load @@ u"=-1"
       |> snd |> Sheet.Raw.add (0,0) @@ Expression.load @@ u"=C3"
       |> snd in
  let result = (Sheet.Raw.get_value (0, 0) s) in
  let expected = Some (ScTypes.Result (build_num (-1))) in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_create_ref_2 ctx = begin

  let s = Sheet.Raw.empty
       |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=C3"
       |> snd |> Sheet.Raw.add (3,3) @@ Expression.load @@ u"=A1"
       |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"123"
       |> snd in


  let result = (Sheet.Raw.get_value (2, 2) s) in
  let expected = Some (ScTypes.Result (build_num 123)) in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_create_direct_cycle ctx = begin

  let s = Sheet.Raw.empty
       |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=B2 + 1"
       |> snd in
  let result = (Sheet.Raw.get_value (2, 2) s) in
  let expected = Some (ScTypes.Error Errors.TypeError) in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_create_indirect_cycle ctx = begin

  let s = Sheet.Raw.empty
       |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=A1"
       |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=2"
       |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=B2+1"
       |> snd |> Sheet.Raw.add (0,0) @@ Expression.load @@ u"=A1"
       |> snd in
  let result = (Sheet.Raw.get_value (0, 0) s) in
  let expected = Some (ScTypes.Error Errors.Cycle) in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_check_cycle3 ctx = begin

  let s = Sheet.Raw.empty
      (* First set A1 to 3 *)
      |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=3"
      |> snd |> Sheet.Raw.add (1,2) @@ Expression.load @@ u"=A1"
      |> snd |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=A1"
      |> snd |> Sheet.Raw.add (5,5) @@ Expression.load @@ u"=B2"
      (* A3 = A1 + A1 = 6 *)
      |> snd |> Sheet.Raw.add (1,3) @@ Expression.load @@ u"=A2 + E5"
      (* Then set A1 to 2 *)
      |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=2"
      |> snd in
  let result = (Sheet.Raw.get_value (1, 3) s) in
  (* A3 = A1 + A1 = 4 *)
  let expected = Some (ScTypes.Result (build_num 4)) in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_delete ctx = begin

  let s = Sheet.Raw.empty
       |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=C3"
       |> snd |> Sheet.Raw.add (3,3) @@ Expression.load @@ u"=A1"
       |> snd |> Sheet.Raw.remove (2,2)
       |> snd |> Sheet.Raw.remove (3,3)
       |> snd in
  let result = (Sheet.Raw.get_value (3, 3) s) in
  let expected = None in

  assert_equal
    ~msg:(_msg ~expected ~result)
    expected
    result
end

let test_update_succs1 ctx = begin

  let result = Sheet.Raw.empty
       |> Sheet.Raw.add (1,1) @@ Expression.load @@ u" =1"
       |> snd |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=A2"
       |> snd |> Sheet.Raw.add (1,2) @@ Expression.load @@ u"=A1/1"
       |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=2"
       |> fst in

  (* All the cells are updated by the change *)
  let expected = Cell.Set.of_list [(1,1); (1, 2); (2,2)] in

  let msg = Printf.sprintf "Expected %s but got %s"
    (UTF8.raw_encode @@ Tools.String.print_buffer Cell.Set.printb expected)
    (UTF8.raw_encode @@ Tools.String.print_buffer Cell.Set.printb result) in

  assert_equal ~msg
    expected
    result
end

let test_update_succs2 ctx = begin

  let result = Sheet.Raw.empty
       |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=1"
       |> snd |> Sheet.Raw.add (2,2) @@ Expression.load @@ u"=A2"
       |> snd |> Sheet.Raw.add (1,2) @@ Expression.load @@ u"=A1/0"
       |> snd |> Sheet.Raw.add (1,1) @@ Expression.load @@ u"=2"
       |> fst in
  (* Only (1, 1) is updated ; (2, 2) does not change, neither (2, 2) *)
  let expected = Cell.Set.of_list [(1,1)] in

  assert_equal
    expected
    result
end

let tests = "sheet_test">::: [
    "test_ref1"     >:: test_create_ref_1;
    "test_ref2"     >:: test_create_ref_2;
    "test_cycle1"   >:: test_create_direct_cycle;
    "test_cycle2"   >:: test_create_indirect_cycle;
    "test_cycle3"   >:: test_check_cycle3;
    "test_delete"   >:: test_delete;
    "test_update_succs1"   >:: test_update_succs1;
    "test_update_succs2"   >:: test_update_succs2;
 ]