using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using Com.LuisPedroFonseca.ProCamera2D;

public class VNController : MonoBehaviour {
    [SerializeField] float bgCrossfadeTime = 0.5f;

    [SerializeField] DialogueController dialogueBox;

    [SerializeField] VNSpriteController vnSpriteCenter;
    [SerializeField] VNSpriteController vnSpriteLeft;
    [SerializeField] VNSpriteController vnSpriteRight;

    [SerializeField] Image bgBack;
    // Used for cross-fading.
    [SerializeField] Image bgFront;

    [SerializeField] bool LeaveAfterDone = false;

    [HideInInspector] VNObjectController vnAssets;
    [HideInInspector] AudioSource audioSource;
    [HideInInspector] bool isLeaving = false;

    [SerializeField] ProCamera2DTransitionsFX transition;
    [SerializeField] bool loadExternalAssets = false;

    private void Leave() {
        SceneManager.LoadScene("Manager");
    }

    public void Done() {
        if (LeaveAfterDone && !isLeaving) {
            transition.OnTransitionExitEnded = Leave;
            transition.TransitionExit();
            isLeaving = true;
        }
    }

    private class SetSpriteOptions {
        public Body spriteBody { get; set; } = Body.None;
        // Requires spriteBody.
        public int spriteHair { get; set; } = 0;
        public Expression spriteExpression { get; set; } = Expression.None;
        public bool removeSprite { get; set; } = false;
    }

    private void SetSprite(VNSpriteController spriteController, SetSpriteOptions options) {
        int spriteIndex = (int)options.spriteBody - 1;
        if (options.spriteBody != Body.None && spriteIndex < vnAssets.sprites.Count) {
            spriteController.body.gameObject.SetActive(true);
            spriteController.body.sprite = vnAssets.sprites[spriteIndex];
            spriteController.hair.gameObject.SetActive(true);
            spriteController.hair.sprite = vnAssets.spriteHairs[options.spriteHair];
        }

        int spriteExpressionIndex = (int)options.spriteExpression - 1;
        if (options.spriteExpression != Expression.None && spriteExpressionIndex < vnAssets.spriteExpressions.Count) {
            spriteController.expression.gameObject.SetActive(true);
            spriteController.expression.sprite = vnAssets.spriteExpressions[spriteExpressionIndex];
        }
        
        if (options.removeSprite) {
            spriteController.body.gameObject.SetActive(false);
            spriteController.hair.gameObject.SetActive(false);
            spriteController.expression.gameObject.SetActive(false);
        }

        Debug.Log("TODO: Effect animation");
    }

    public void Interact(DialogueInteraction interaction) {
        // Cancel any pending crossfades.
        if (bgFront != null) {
            bgFront.CrossFadeAlpha(1.0f, 0.0f, false);
        }

        // If there's a new background, fade into it.
        if (bgFront != null && bgBack != null && interaction.backgroundIndex > -1) {
            if (bgBack.sprite != null) {
                bgBack.sprite = bgFront.sprite;
                if (interaction.backgroundIndex < vnAssets.backgrounds.Count) {
                    bgFront.sprite = vnAssets.backgrounds[interaction.backgroundIndex];
                    bgFront.GetComponent<CanvasRenderer>().SetAlpha(0);
                    bgFront.CrossFadeAlpha(1.0f, bgCrossfadeTime, false);
                    Debug.Log(bgFront.color.ToString());
                    Debug.Log(bgFront.sprite.ToString());
                } else {
                    Debug.LogError("Background index out of range for interaction!");
                }
            } else {
                bgBack.sprite = bgFront.sprite = vnAssets.backgrounds[interaction.backgroundIndex];
                bgFront.CrossFadeAlpha(1.0f, 0.0f, false);
            }
        }

        // If there's an audio clip, play it.
        if (audioSource != null && interaction.audioClipIndex > -1) {
            if (interaction.audioClipIndex < vnAssets.voiceBank.Count) {
                audioSource.PlayOneShot(vnAssets.voiceBank[interaction.audioClipIndex]);
            } else {
                Debug.LogError("AudioClip index out of range for interaction!");
            }
        }

        // If a sprite is defined, set it.
        SetSprite(vnSpriteCenter, new SetSpriteOptions() {
            spriteBody =        interaction.body1,
            spriteHair =        interaction.hair1,
            spriteExpression =  interaction.expression1,
            removeSprite =      interaction.removeBody1,
        });
        SetSprite(vnSpriteLeft, new SetSpriteOptions() {
            spriteBody =        interaction.body2,
            spriteHair =        interaction.hair2,
            spriteExpression =  interaction.expression2,
            removeSprite =      interaction.removeBody2,
        });
        SetSprite(vnSpriteRight, new SetSpriteOptions() {
            spriteBody =        interaction.body3,
            spriteHair =        interaction.hair3,
            spriteExpression =  interaction.expression3,
            removeSprite =      interaction.removeBody3,
        });

        // TODO: If there's a music clip, stop the currently running clip and play it.
        Debug.Log("TODO: Music change");
    }

    // Called by DialogueControler to enforce loading before the first Interact.
    public void SetUp(Dialogue scene)
    {
        if (loadExternalAssets) {
            vnAssets = Instantiate((GameObject)Resources.Load(VNData.GetDialogueAssetPackFor(scene), typeof(GameObject))).GetComponent<VNObjectController>();
        } else {
            vnAssets = gameObject.GetComponent<VNObjectController>();
        }
        audioSource = gameObject.GetComponent<AudioSource>();

        if (LeaveAfterDone) {
            transition.TransitionEnter();
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}