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

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 (score > int.Parse(highscoreList[i])) {

                    //set insert index
                    insertIndex = i - 1;

                    //set addToEndOfFile to false
                    addToEndOfFile = false;

                    break;
                }
            }
        }

        //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();
        //Debug.Log(string.Format("-----There are {0} highscore entries-----", hs.Count() / 2));

        for (int i = 0; i < hs.Count; i += 2) {
           // Debug.Log(string.Format("Entry: {0}|Name: {1}|Score: {2}", i / 2, hs[i], hs[i + 1]));
        }
    }

    public static List<string> GetHighscores() {
        List<string> hs = LoadHighscores();
        List<string> returnHs = new List<string>();

        int limit;

        if (hs.Count > 6) {
            limit = 6;
        } else {
            limit = hs.Count;
        }

        for (int i = 0; i < limit; i += 2) {
            returnHs.Add(hs[i]);
        }
        return returnHs;
    }

}