using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
using System.Text;

public class HighScoreManager : MonoBehaviour {

    private static readonly string CSV_HIGHSCORE_KEY = "highScores";


    public static void SaveHighscore(int score, string name){
        int insertIndex = 0;
        bool addToEndOfFile = true;
        List<string> highscoreList = LoadHighscores ();
        List<string> tempList = new List<string> ();
        StringBuilder sb = new StringBuilder ();

        //If  the highscores contains previous scores
        if (highscoreList.Count != 0) {

            //For each score value in the highscore list
            for (int i = 1; i < highscoreList.Count; i += 2){

                //If score is higher than selected value
                if (int.Parse(highscoreList[i]) < score) {

                    //set insert index
                    insertIndex = i;

                    //set addToEndOfFile to false
                    addToEndOfFile = false;
                }
            }
        }

        //If addToEndOfFile is true
        if (addToEndOfFile) {

            //Add score to end of the list
            highscoreList.Add (name);
            highscoreList.Add (score.ToString ());
        } else {

            //Move data over to a temporary list, this is faster than using insert
            for (int i = 0; i < highscoreList.Count; i++) {

                //If the current index is where we have to insert the new score
                if (i == insertIndex) {

                    //Insert the player score and name
                    tempList.Add (name);
                    tempList.Add (score.ToString ());
                }

                //Add the value from the old list to the end of the temp list
                tempList.Add (highscoreList [i]);
            }
            //Set highscoreList to the values of tempList
            highscoreList = tempList;
        }

        //Create a string with all the data from the List, with a comma (',') seperating each array item
        for (int i = 0; i < highscoreList.Count; i++){
            if (i == 0) {
                sb.Append (highscoreList [i]);
            }else{
                sb.Append (",");
                sb.Append (highscoreList [i]);
            }
        }

        //Save the string to player prefs
        SaveToPlayerPrefs(sb.ToString());

    }

    private static void SaveToPlayerPrefs(string csv){
        //Set the playerPrefs value to the input string
        PlayerPrefs.SetString(CSV_HIGHSCORE_KEY, csv);
    }

    public static List <string> LoadHighscores(){

        //If the playerPrefs exists
        if (PlayerPrefs.HasKey (CSV_HIGHSCORE_KEY)) {

            //Get the CSV string from playerPrefs
            string csv = PlayerPrefs.GetString (CSV_HIGHSCORE_KEY);

            //Return a List of strings, seperating the CSV by commas
            return csv.Split (',').ToList ();
        } else {
            //Return blank List
            return new List<string> ();
        }
    }
    public static void ShowHighscores(){
        List<string> hs = LoadHighscores();
        for(int i = 1; i < hs.Count; i += 2){
            Debug.Log(hs[i] + ":" + hs[i + 1]);
                }
                }
}