using System.Collections.Generic;
using UnityEngine.InputSystem;
using UnityEngine;

[RequireComponent(typeof(CharacterVoiceObject))]
public class DialogPlayer : MonoBehaviour
{
    [SerializeField] private List<DialogGroup> _dialogGroups;
    private Dictionary<string, DialogGroup> _dialogGroupMap;
    private Animator _animator;
    public bool IsPlaying { get; private set; }

    private void Awake()
    {
        _dialogGroupMap = new Dictionary<string, DialogGroup>();
        foreach (var g in _dialogGroups)
            _dialogGroupMap[g.DialogGroupName] = g;

        _animator = GetComponentInChildren<Animator>();
    }

    public async Awaitable Play()
    {
        if(_dialogGroups.Count > 0)
            _ = Play(_dialogGroups[0].DialogGroupName);
    }

    public async Awaitable Play(string groupName)
    {
        if (IsPlaying) return;
        if (!_dialogGroupMap.TryGetValue(groupName, out var group))
        {
            Debug.LogWarning($"[DialogPlayer] 그룹 없음: {groupName}");
            return;
        }

        IsPlaying = true;
        try
        {
            var node = group.StartNode;
            while (node != null)
            {
                await PlayNode(node);

                if (node.Choices != null && node.Choices.Count > 0)
                {
                    int picked = await WaitForChoice(node);
                    node = node.Choices[picked].DestinationNode;
                }
                else
                {
                    node = node.Next;
                }
            }
        }
        finally
        {
            IsPlaying = false;
        }

        Debug.Log("[DialogPlayer] 대화 종료");
    }

    private async Awaitable PlayNode(DialogNode node)
    {
        var speakerName = node.Speaker != null ? node.Speaker.Name : "(누구?)";
        Debug.Log($"[{speakerName}] {node.TalkText}");

        // 보이스 재생
        if (node.Voice != null && node.Speaker != null)
        {
            var voiceObj = CharacterVoiceObject.Find(node.Speaker);
            if (voiceObj != null && node.Voice.Clip != null)
                voiceObj.Play(node.Voice.Clip);
        }

        if (node.Gesture != null)
            _animator.CrossFade(node.Gesture.StateName, node.Gesture.CrossFadeDuration, node.Gesture.AnimationLayer);
        if (node.Expression != null)
            _animator.CrossFade(node.Expression.StateName, node.Expression.CrossFadeDuration, node.Expression.AnimationLayer);

        // 대기 시간 결정
        float wait = 0f;
        if (node.Voice != null && node.Voice.Clip != null)
            wait = node.Voice.Clip.length;
        else
            wait = node.LineDuration;

        if (wait > 0f)
            await Awaitable.WaitForSecondsAsync(wait);
        else
            await WaitForAdvanceInput();  // 수동 진행
    }

    private async Awaitable<int> WaitForChoice(DialogNode node)
    {
        // TODO: 선택지 UI 띄우기. 일단은 첫 번째 선택지 자동 선택 (테스트용)
        Debug.Log("[DialogPlayer] 선택지 대기 — 일단 0번 자동 선택");
        await Awaitable.WaitForSecondsAsync(0.5f);
        return 0;
    }

    private async Awaitable WaitForAdvanceInput()
    {
        // TODO: VR 컨트롤러 버튼 입력 대기. 일단은 1초 대기
        await Awaitable.WaitForSecondsAsync(1f);
    }
}