using System.Linq;
using System.Net.Mime;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using CSVReader;
using ObjectScripts;
namespace UIScripts
{
    public class EventList : MonoBehaviour
    {

        ///<summary>
        /// The Canvas Containing the EventList
        ///</summary>
        [SerializeField] GameObject ScrollCanvas;
        ///<summary>
        /// The Prefab for a eventpage in the eventlist
        ///</summary>
        [SerializeField] GameObject EventPage;
        ///<summary>
        /// the prefab for a eventpage entry in the eventlist
        ///</summary>
        [SerializeField] GameObject EventPageEntry;
        ///<summary>
        /// the prafab for a entry in the eventpage entry
        ///</summary>
        [SerializeField] GameObject EventEntry;
        ///<summary>
        /// Eventhandler to get events 
        ///</summary>
        [SerializeField] AbstractEventHandler EventHandler;
        ///<summary>
        /// Text that shows the curren page timestamp
        ///</summary>
        [SerializeField] UnityEngine.UI.Text TimestampText;
        ///<summary>
        /// Button prefab for each entry
        ///</summary>
        [SerializeField] UnityEngine.UI.Button JumpButton;
        ///<summary>
        /// Manager to control
        ///</summary>
        [SerializeField] AbstractManager Manager;
        ///<summary>
        /// Dictionary to keep track of each page in the eventlist
        ///</summary>
        Dictionary<double, GameObject> PageDictionary;
        ///<summary>
        /// Dicitonary to keep track of each entry in a page
        ///</summary>
        Dictionary<GameObject, List<GameObject>> EventPageEntries;
        ///<summary>
        /// number of already read events
        ///</summary>
        int KnownCount = 0;
        ///<summary>
        /// Anchor for positioning the entries
        ///</summary>
        Vector2 Anchor = new Vector2(0.5f, 1);
        ///<summary>
        /// Pivot for positioning the entries
        ///</summary>
        Vector2 Pivot = new Vector2(0.5f, 0.5f);
        ///<summary>
        /// The currently shown page
        ///</summary>
        GameObject CurrentPage = null;
        ///<summary>
        /// the currently shown timestamp of the page
        ///</summary>
        double CurrentTimestamp = -1;
        ///<summary>
        /// Scrollrect to control the list
        ///</summary>
        UnityEngine.UI.ScrollRect ScrollRect;
        ///<summary>
        /// size of each step after pressing up or down
        ///</summary>
        float Stepsize = 30;

        void Start()
        {
            PageDictionary = new Dictionary<double, GameObject>();
            EventPageEntries = new Dictionary<GameObject, List<GameObject>>();
            ScrollRect = ScrollCanvas.GetComponent<UnityEngine.UI.ScrollRect>();
        }

        // Update is called once per frame
        void Update()
        {
            //handle new events
            for (int i = KnownCount; i < EventHandler.EventList.Count; i++)
            {
                //get timestamp 
                double timestamp = EventHandler.EventList[i].Event.TimestampStart;
                GameObject page;
                GameObject pageEntry;
                List<GameObject> eventPageEntries;
                //check if there is a page for that timestamp
                //if not create a new page
                if (PageDictionary.TryGetValue(timestamp, out page))
                {

                    eventPageEntries = EventPageEntries[page];
                }
                else
                {
                    page = Instantiate(EventPage, EventPage.transform.parent);
                    page.SetActive(false);
                    PageDictionary.Add(timestamp, page);
                    eventPageEntries = new List<GameObject>();
                    EventPageEntries.Add(page, eventPageEntries);
                    if (CurrentPage == null)
                    {
                        ScrollRect.content = page.GetComponent<RectTransform>();
                        CurrentTimestamp = timestamp;
                        TimestampText.text = timestamp.ToString();
                        page.SetActive(true);
                        CurrentPage = page;
                    }
                }
                //create page entry
                pageEntry = Instantiate(EventPageEntry, page.transform);
                pageEntry.SetActive(true);
                GameObject entry = pageEntry.transform.Find(EventEntry.name).gameObject;
                UnityEngine.UI.Text text = entry.transform.Find("Text").gameObject.GetComponent<UnityEngine.UI.Text>();
                UnityEngine.UI.Button button = entry.transform.Find(JumpButton.name).gameObject.GetComponent<UnityEngine.UI.Button>();
                button.onClick.AddListener(delegate { onJumpButton(timestamp); });

                //the text to show
                text.text = string.Format("EventType: {0} - Pos:{1} - EndTime:{2}", EventHandler.EventList[i].Event.Type, EventHandler.EventList[i].Event.Pos, EventHandler.EventList[i].Event.TimestampEnd);

                //set the postion
                RectTransform rectPageEntry = pageEntry.GetComponent<RectTransform>();
                rectPageEntry.anchorMax = Anchor;
                rectPageEntry.anchorMin = Anchor;
                Vector2 pos = -new Vector2(0, eventPageEntries.Count * rectPageEntry.sizeDelta.y + rectPageEntry.sizeDelta.y / 2);
                rectPageEntry.anchoredPosition = pos;

                //add the entry to the page
                eventPageEntries.Add(pageEntry);
                //increase the page size
                page.GetComponent<RectTransform>().sizeDelta += new Vector2(0, rectPageEntry.sizeDelta.y);
                //increase the count
                KnownCount += 1;

            }
        }
        ///<summary>
        /// On Button in List pressed
        ///</summary>
        void onJumpButton(double timestamp)
        {
            Manager.JumpToTimestamp(timestamp);
            Manager.StopPressed();
        }
        ///<summary>
        /// On up button pressed
        ///</summary>
        public void ScrollbarUP()
        {
            CurrentPage.GetComponent<RectTransform>().anchoredPosition = CurrentPage.GetComponent<RectTransform>().anchoredPosition - new Vector2(0, Stepsize);
        }
        ///<summary>
        /// On down button pressed
        ///</summary>
        public void ScrollbarDOWN()
        {
            CurrentPage.GetComponent<RectTransform>().anchoredPosition = CurrentPage.GetComponent<RectTransform>().anchoredPosition + new Vector2(0, Stepsize);
        }
        ///<summary>
        /// get previous page
        ///</summary>
        public void OnLeft()
        {
            double nextPageTimestamp = PageDictionary.Keys.Where(k => k < CurrentTimestamp).DefaultIfEmpty().Max();
            GameObject nextPage;
            if (PageDictionary.TryGetValue(nextPageTimestamp, out nextPage))
            {
                nextPage = PageDictionary[nextPageTimestamp];

                ScrollRect.content = nextPage.GetComponent<RectTransform>();
                CurrentPage.SetActive(false);
                CurrentTimestamp = nextPageTimestamp;
                TimestampText.text = CurrentTimestamp.ToString();
                nextPage.SetActive(true);
                CurrentPage = nextPage;
                CurrentPage.GetComponent<RectTransform>().anchoredPosition = new Vector2(0, -CurrentPage.GetComponent<RectTransform>().sizeDelta.y);
            }
        }
        ///<summary>
        /// get next page
        ///</summary>
        public void OnRight()
        {
            double nextPageTimestamp = PageDictionary.Keys.Where(k => k > CurrentTimestamp).DefaultIfEmpty().Min();
            GameObject nextPage;
            if (PageDictionary.TryGetValue(nextPageTimestamp, out nextPage))
            {
                nextPage = PageDictionary[nextPageTimestamp];
                ScrollRect.content = nextPage.GetComponent<RectTransform>();
                CurrentPage.SetActive(false);
                CurrentTimestamp = nextPageTimestamp;
                TimestampText.text = CurrentTimestamp.ToString();
                nextPage.SetActive(true);
                CurrentPage = nextPage;
                CurrentPage.GetComponent<RectTransform>().anchoredPosition = new Vector2(0, -CurrentPage.GetComponent<RectTransform>().sizeDelta.y);
            }

        }
    }
}