// Copyright (c) Pixel Crushers. All rights reserved.

using UnityEngine;
using System.Collections.Generic;

namespace PixelCrushers.DialogueSystem
{

    /// <summary>
    /// This component hooks up the elements of a Unity UI quest template.
    /// Add it to your quest template and assign the properties.
    /// </summary>
    [AddComponentMenu("")] // Use wrapper.
    public class UnityUIQuestTemplate : MonoBehaviour
    {

        [Header("Quest Heading")]
        [Tooltip("The heading - name or description depends on window setting")]
        public UnityEngine.UI.Button heading;

        [Tooltip("Used for Description")]
        public UnityEngine.UI.Text description;

        public UnityUIQuestTemplateAlternateDescriptions alternateDescriptions = new UnityUIQuestTemplateAlternateDescriptions();

        [Header("Quest Entries")]
        [Tooltip("(Optional) If set, holds instantiated quest entries")]
        public Transform entryContainer;

        [Tooltip("Used for quest entries")]
        public UnityEngine.UI.Text entryDescription;

        public UnityUIQuestTemplateAlternateDescriptions alternateEntryDescriptions = new UnityUIQuestTemplateAlternateDescriptions();

        [Header("Buttons")]
        [Tooltip("Used for Track button if quest is trackable")]
        public UnityEngine.UI.Button trackButton;

        [Tooltip("Used for Abandon button if quest is abandonable")]
        public UnityEngine.UI.Button abandonButton;

        protected List<GameObject> entryInstances = new List<GameObject>();

        public bool ArePropertiesAssigned
        {
            get
            {
                return (heading != null) &&
                    (description != null) && (entryDescription != null) &&
                    (trackButton != null) && (abandonButton != null);
            }
        }

        protected int numEntries = 0;

        public virtual void Initialize()
        {
            if (description != null) description.gameObject.SetActive(false);
            if (entryDescription != null) entryDescription.gameObject.SetActive(false);
            alternateEntryDescriptions.SetActive(false);
            if (entryContainer != null) entryContainer.gameObject.SetActive(false);
        }

        public virtual void ClearQuestDetails()
        {
            if (entryContainer == null)
            {

                // No container, so clear entryDescription, which is a big multi-line string:
                if (entryDescription != null)
                {
                    entryDescription.text = string.Empty;
                }
            }
            else
            {
                // Clear container:
                for (int i = 0; i < entryInstances.Count; i++)
                {
                    Destroy(entryInstances[i]);
                }
                entryInstances.Clear();
            }
            numEntries = 0;
        }

        public virtual void AddEntryDescription(string text, QuestState entryState)
        {
            if (entryContainer == null)
            {

                // No container, so make entryDescription a big multi-line string:
                if (entryState != QuestState.Unassigned)
                {
                    alternateEntryDescriptions.SetActive(false);
                    if (entryDescription != null)
                    {
                        if (numEntries == 0)
                        {
                            entryDescription.gameObject.SetActive(true);
                            entryDescription.text = text;
                        }
                        else
                        {
                            entryDescription.text += "\n" + text;
                        }
                    }
                }
            }
            else
            {

                // Instantiate into container:
                if (numEntries == 0)
                {
                    entryContainer.gameObject.SetActive(true);
                    if (entryDescription != null) entryDescription.gameObject.SetActive(false);
                    alternateEntryDescriptions.SetActive(false);
                }
                switch (entryState)
                {
                    case QuestState.Active:
                        InstantiateFirstValidTextElement(text, entryContainer, entryDescription);
                        break;
                    case QuestState.Success:
                        InstantiateFirstValidTextElement(text, entryContainer, alternateEntryDescriptions.successDescription, entryDescription);
                        break;
                    case QuestState.Failure:
                        InstantiateFirstValidTextElement(text, entryContainer, alternateEntryDescriptions.failureDescription, entryDescription);
                        break;
                }
            }
            numEntries++;
        }

        protected void InstantiateFirstValidTextElement(string text, Transform container, params UnityEngine.UI.Text[] textElements)
        {
            for (int i = 0; i < textElements.Length; i++)
            {
                if (textElements[i] != null)
                {
                    var instance = Instantiate(textElements[i].gameObject) as GameObject;
                    entryInstances.Add(instance); ;
                    instance.transform.SetParent(container.transform, false);
                    instance.SetActive(true);
                    var textElement = instance.GetComponent<UnityEngine.UI.Text>();
                    if (textElement != null) textElement.text = text;
                    return;
                }
            }
        }

    }

}