module RedCat.DrugsDataExtractor

open System.Collections.Generic
open Newtonsoft.Json.Linq
open FuzzySharp

open System.IO

let drugsJson = File.ReadAllText(Path.Combine("/opt/redcatbot/", "drugs.json"))
let comboJson = File.ReadAllText(Path.Combine("/opt/redcatbot/", "combos.json"))
let DrugsJsonData = JObject.Parse(drugsJson)
let ComboJsonData = JObject.Parse(drugsJson)

let private tryExtractProps (propName: string) (jsonValue: JToken) =
    match jsonValue["properties"][propName] with
    | null -> None
    | token -> token.ToString() |> Some
    
let private tryExtract (x: string) (jsonValue: JToken) =
    match jsonValue[x] with
    | null -> None
    | token -> token.ToString() |> Some
   
let private tryExtractArray (fieldName: string) (jsonValue: JToken) =
    match jsonValue[fieldName] with
    | null -> None
    | categories ->
        categories.Values()
        |> Seq.cast<JToken>
        |> Seq.map(fun text -> text.ToString())
        |> Seq.toList |> Some
       
let private DrugNamesWithAliases =
    DrugsJsonData.Properties()
    |> Seq.map(fun obj ->
        match obj.Value |> tryExtractArray "aliases" with
        | Some aliasesList -> aliasesList |> List.map(fun al -> (al, obj.Name))
        | None -> [(obj.Name, obj.Name)])
    |> Seq.concat
    |> Map.ofSeq
    
let private DrugNames =
    DrugNamesWithAliases |> Map.values |> Set.ofSeq

let private search (userInput: string) =
    let clearString (inStr: string) = inStr.Replace("-", "").Replace(",", "")
    
    let findCond (_in: KeyValuePair<string, string>) =
        match (_in.Key, _in.Value) with
        | _, drugName when drugName = userInput || clearString drugName = userInput ->
            drugName |> Some
        | someAlias, drugName when someAlias = userInput -> drugName |> Some
        | _ -> None
        
    let drugNameFound =
        DrugNamesWithAliases
        |> Seq.choose(findCond)
        |> Seq.tryHead
    
    drugNameFound
    
type DrugRecord = {
    Name: string
    Summary: string option
    Categories: string list option
    OnSet: string option
    TotalDuration: string option
    Dose: string option
}

type ComboRecord = {
    DrugA: string
    DrugB: string
    Status: string option
    Note: string option
}

type SearchResult =
    | DrugRecord of DrugRecord 
    | ResponseText of string 
    
let getComboRecord (userInputA: string) (userInputB: string) =
    let getRecord (jsonValue: JToken) = {
        DrugA = userInputA
        DrugB = userInputB
        Status = jsonValue |> tryExtract "status" 
        Note = jsonValue |> tryExtract "note"
    }

    let tryGetCombo drugA drugB =
        match DrugsJsonData[drugA][drugB] with
        | null -> None
        | obj -> Some obj
        
    match (search userInputA, search userInputB) with
    | None, None -> Error $"Can't find both drugs {userInputA} and {userInputB}" 
    | Some _, None -> Error $"Can't find second drug {userInputB}" 
    | None, Some _ -> Error $"Can't find first drug {userInputA}"
    | Some drugA, Some drugB ->
        tryGetCombo drugA drugB
        |> Option.bind(fun jsonValue -> (getRecord jsonValue) |> Some)
        |> function
            | None -> Error $"Can't find combo from {userInputA} and {userInputB}"
            | Some combo -> combo |> Ok
 
let getSearchResponse (userInput: string) =
    let matches =
        Process.ExtractTop(userInput, DrugNames)
        |> Seq.choose(fun e -> if e.Score > 62 then e.Value |> Some else None)
        |> String.concat "\n- "
        
    match matches with
    | "" -> Error $"Can't find drug name: {userInput}"
    | matches -> $"- {matches}" |> ResponseText |> Ok
    
let getDrugRecord (userInput: string) =
    let getRecord (drugName: string) (jsonValue: JToken) = {
        Name = drugName
        Summary = jsonValue |> tryExtractProps "summary"
        Categories = jsonValue |> tryExtractArray "categories"
        OnSet = jsonValue |> tryExtractProps "onset"
        TotalDuration = jsonValue |> tryExtractProps "duration"
        Dose = jsonValue |> tryExtractProps "dose" 
    }

    match search userInput with
    | Some drugName -> getRecord drugName DrugsJsonData[drugName] |> DrugRecord |> Ok
    | None -> getSearchResponse userInput