import std/math
import std/options
import std/strutils
import std/unittest
import pkg/stint
import pkg/serde
import pkg/questionable
import pkg/questionable/results

suite "json serialization - deserialize":

  test "deserializes NaN float":
    check %NaN == newJString("nan")

  test "deserialize enum":
    type MyEnum = enum
      First,
      Second
    let json = newJString("Second")
    check !MyEnum.fromJson(json) == Second

  test "deserializes UInt256 from non-hex string representation":
    let json = newJString("100000")
    check !UInt256.fromJson(json) == 100000.u256

  test "deserializes Option[T] when has a value":
    let json = newJInt(1)
    check (!fromJson(?int, json) == some 1)

  test "deserializes Option[T] when doesn't have a value":
    let json = newJNull()
    check !fromJson(?int, json) == none int

  test "deserializes float":
    let json = newJFloat(1.234)
    check !float.fromJson(json) == 1.234

  test "deserializes Inf float":
    let json = newJString("inf")
    check !float.fromJson(json) == Inf

  test "deserializes -Inf float":
    let json = newJString("-inf")
    check !float.fromJson(json) == -Inf

  test "deserializes NaN float":
    let json = newJString("nan")
    check (!float.fromJson(json)).isNaN

  test "deserializes array to sequence":
    let expected = @[1, 2, 3]
    let json = !"[1,2,3]".parseJson
    check !seq[int].fromJson(json) == expected

  test "deserializes uints int.high or smaller":
    let largeUInt: uint = uint(int.high)
    let json = newJInt(BiggestInt(largeUInt))
    check !uint.fromJson(json) == largeUInt

  test "deserializes large uints":
    let largeUInt: uint = uint(int.high) + 1'u
    let json = newJString($BiggestUInt(largeUInt))
    check !uint.fromJson(json) == largeUInt

  test "can deserialize json objects":
    type MyObj = object
      mystring: string
      myint: int
      myoption: ?bool

    let expected = MyObj(mystring: "abc", myint: 123, myoption: some true)

    let json = !parseJson("""{
                              "mystring": "abc",
                              "myint": 123,
                              "myoption": true
                            }""")
    check !MyObj.fromJson(json) == expected

  test "ignores serialize pragma when deserializing":
    type MyObj = object
      mystring {.serialize.}: string
      mybool: bool

    let expected = MyObj(mystring: "abc", mybool: true)

    let json = !parseJson("""{
                              "mystring": "abc",
                              "mybool": true
                            }""")

    check !MyObj.fromJson(json) == expected

  test "deserializes objects with extra fields":
    type MyObj = object
      mystring: string
      mybool: bool

    let expected = MyObj(mystring: "abc", mybool: true)

    let json = !"""{
                    "mystring": "abc",
                    "mybool": true,
                    "extra": "extra"
                  }""".parseJson
    check !MyObj.fromJson(json) == expected

  test "deserializes objects with less fields":
    type MyObj = object
      mystring: string
      mybool: bool

    let expected = MyObj(mystring: "abc", mybool: false)

    let json = !"""{
                    "mystring": "abc"
                  }""".parseJson
    check !MyObj.fromJson(json) == expected

  test "deserializes ref objects":
    type MyRef = ref object
      mystring: string
      myint: int

    let expected = MyRef(mystring: "abc", myint: 1)

    let json = !"""{
                    "mystring": "abc",
                    "myint": 1
                  }""".parseJson

    let deserialized = !MyRef.fromJson(json)
    check deserialized.mystring == expected.mystring
    check deserialized.myint == expected.myint