namespace LibraryTests

    module TestingHelpers =

        open System
        open System.Drawing
        open System.Reflection
        open System.IO

        let loadLocation = __SOURCE_DIRECTORY__ + "/LoadingTestArea"
        let saveLocation  = __SOURCE_DIRECTORY__ + "/SavingTestArea"

        let allColours =
            let properties =
                typeof<Brushes>.GetProperties(BindingFlags.Public ||| BindingFlags.Static)
            seq { for prop in properties -> prop}
            |> Seq.toArray

        let randomBrush () =
            let item = allColours.[Random().Next(allColours.Length)]
            item.GetValue(null, null)

        let imagesInLoadingTestArea = Directory.GetFileSystemEntries (loadLocation, "*.png")

        let generateLoadPath () =
            let rand = Random ()
            let files = imagesInLoadingTestArea
            files.[rand.Next(files.Length)]

        let generateSavePath originalFilePath =
            let fileName = Path.GetFileName originalFilePath
            saveLocation + "/" + fileName

        let fileSaved path = File.Exists path

    module PropertyTests =

        open FsCheck.Xunit
        open DeathSocket
        open System.Drawing
        open DeathSocket.GridPainter
        open TestingHelpers
        open System.IO

        [<Property>]
        let ``Can apply grid to image and save it`` () =
            let oPath = generateLoadPath ()
            let sPath = generateSavePath oPath
            let spec =
                { originalPath = oPath
                  savePath = sPath
                  colour = randomBrush () :?> Brush
                  penWidth = float32 0.1
                  rows = 10
                  columns = 10 }
            applyGrid spec
            |> Async.RunSynchronously
            (File.Exists sPath) = true

    module UnitTests =

        open System.IO
        open TestingHelpers
        open Xunit

        // This test is just a check to make sure the property tests have what they need to run.
        [<Fact>]
        let ``LoadingTestArea contains at least 100 test images`` () =
            let length = imagesInLoadingTestArea.Length
            let imagesAreThere = if length < 100 then false else true
            Assert.True imagesAreThere