module ParasitemiaUI.Utils

open System.IO

open Newtonsoft.Json
open Newtonsoft.Json.Converters

open Types

let listAsStr (s : 'a seq) =
    s |> Seq.fold (fun acc obj -> acc + (if acc = "" then "" else ", ") + obj.ToString()) ""

let percentText (nbTotal : int, nb : int) : string =
    if nbTotal = 0 then
        ""
    else
        let percent = 100. * (float nb) / (float nbTotal)
        sprintf "%.1f %% (%d / %d)" percent nb nbTotal

let roamingDir =
    Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.ApplicationData), "Parasitemia")

let predefinedPPIFilename = "predefined-ppi.json"
let predefinedPPIFilepath = Path.Combine(roamingDir, predefinedPPIFilename)

let sensorSizesFilename = "sensor-sizes.json"
let sensorSizesFilepath = Path.Combine(roamingDir, sensorSizesFilename)

let private savePredefinedPPIToFile (predefinedPPI : PredefinedPPI list) =
    try
        use file = new StreamWriter(predefinedPPIFilepath)
        file.Write(JsonConvert.SerializeObject(predefinedPPI, JsonSerializerSettings(Formatting = Formatting.Indented)))
    with
        ex ->
            Logger.Log.Error "Unable to save predefined PPI to file \"%s\": %O" predefinedPPIFilepath ex

let private saveSensorSizesToFile (sensorSizes : SensorSize list) =
    try
        use file = new StreamWriter(sensorSizesFilepath)
        file.Write(JsonConvert.SerializeObject(sensorSizes, JsonSerializerSettings(Formatting = Formatting.Indented)))
    with
        ex ->
            Logger.Log.Error "Unable to save sensor sizes to file \"%s\": %O" sensorSizesFilepath ex

let predefinedPPI : PredefinedPPI list =
    try
        use file = new StreamReader(predefinedPPIFilepath)
        JsonConvert.DeserializeObject<PredefinedPPI list>(file.ReadToEnd())
    with
    | ex ->
        savePredefinedPPIToFile defaultPredefinedPPI
        defaultPredefinedPPI

let sensorSizes : SensorSize list =
    try
        use file = new StreamReader(sensorSizesFilepath)
        JsonConvert.DeserializeObject<SensorSize list>(file.ReadToEnd())
    with
    | ex ->
        saveSensorSizesToFile defaultSensorSizes
        defaultSensorSizes