module Parasitemia.GUI.State

open System.Collections.Generic
open System.Windows

open Emgu.CV
open Emgu.CV.Structure

open Types

type State () =
    let sourceImages = List<SourceImage>()

    member val CurrentImage: SourceImage option = None with get, set
    member val FilePath: string = "" with get, set
    member val PatientID: string = "" with get, set

    member this.ImageParasitemia (srcImg: SourceImage) : int * int =
        List.length srcImg.rbcs,
        srcImg.rbcs |> List.fold (fun nbInfected rbc -> if rbc.infected then nbInfected + 1 else nbInfected) 0

    member this.GlobalParasitemia : int * int =
        sourceImages
        |> Seq.fold (fun (nbTotal, nbTotalInfected) srcImg ->
                        let nb, nbInfected = this.ImageParasitemia srcImg
                        nbTotal + nb, nbTotalInfected + nbInfected) (0, 0)

    member this.Save () =
        let data = { PiaZ.sources = List.ofSeq sourceImages; PiaZ.patientID = this.PatientID }
        PiaZ.save this.FilePath data

    member this.Load () =
        let data = PiaZ.load this.FilePath
        this.PatientID <- data.patientID
        sourceImages.Clear()
        sourceImages.InsertRange(0, data.sources)
        if sourceImages.Count > 0
        then this.CurrentImage <- Some sourceImages.[0]

    member this.AddSourceImage (filePath: string) : SourceImage =
        let srcImg = { num = sourceImages.Count + 1; rbcs = []; img = new Image<Bgr, byte>(filePath) }
        sourceImages.Add(srcImg)
        if sourceImages.Count = 1
        then this.CurrentImage <- Some sourceImages.[0]
        srcImg

    member this.SetResult (imgNum: int) (cells: Cell list) =
        let sourceImage = sourceImages.Find(fun srcImg -> srcImg.num = imgNum)
        let w = sourceImage.img.Width
        let h = sourceImage.img.Height
        sourceImage.rbcs <- cells
            |> List.filter (fun cell -> match cell.cellClass with HealthyRBC | InfectedRBC -> true | _ -> false )
            |> List.sortByDescending (fun cell -> cell.infectedArea, (w - cell.center.X) + (h - cell.center.Y))
            |> List.mapi (fun i cell ->
                { num = i + 1
                  infected = cell.cellClass = InfectedRBC
                  setManually = false
                  center = Point(float cell.center.X, float cell.center.Y)
                  size = Size(float cell.elements.Width, float cell.elements.Height)
                  infectedArea = cell.infectedArea })

    member this.SourceImages : SourceImage seq =
        sourceImages :> SourceImage seq

    member this.Reset () =
        this.PatientID <- ""
        sourceImages.Clear()