module ParasitesMarker2

open System.Drawing

open Emgu.CV
open Emgu.CV.Structure

type Result = {
    darkStain: Image<Gray, byte>
    stain: Image<Gray, byte>
    infection: Image<Gray, byte> }

// Create three binary markers :
// * 'Dark stain' corresponds to the colored pixel, it's independent of the size of the areas.
// * 'Stain' corresponds to the stain around the parasites.
// * 'Infection' corresponds to the parasite. It shouldn't contain thrombocytes.
let find (filteredGreen: Image<Gray, byte>) (filteredGreenFloat: Image<Gray, float32>) (kmediansResult: KMedians.Result) (config: Config.Config) : Result * Image<Gray, byte> * Image<Gray, byte> =

    // We use the filtered image to find the dark stain.
    let { KMedians.fg = fg; KMedians.median_bg = median_bg; KMedians.median_fg = median_fg; KMedians.d_fg = d_fg } = kmediansResult
    let darkStain = d_fg.Cmp(median_bg * config.Parameters.darkStainLevel, CvEnum.CmpType.GreaterThan)
    darkStain._And(filteredGreenFloat.Cmp(median_fg, CvEnum.CmpType.LessThan))

    let marker (area: int) (threshold: float) : Image<Gray, byte> * Image<Gray, byte> =
        let closed = filteredGreen.Copy()
        ImgTools.areaClose closed area
        let diff = closed - filteredGreen

        let min = ref [| 0. |]
        let minLocation = ref <| [| Point() |]
        let max = ref [| 0. |]
        let maxLocation = ref <| [| Point() |]
        diff.MinMax(min, max, minLocation, maxLocation)

        diff._ThresholdBinary((!max).[0] * threshold |> Gray, Gray(255.))
        diff, closed

    let parasitesMarker, filteredGreenWithoutParasites  = marker (int config.ParasiteArea) config.Parameters.infectionLevel
    let stainMarker, filteredGreenWithoutStain = marker (int config.StainArea) config.Parameters.stainLevel

    { darkStain = darkStain
      stain = parasitesMarker
      infection = stainMarker },
    filteredGreenWithoutParasites,
    filteredGreenWithoutStain