using UnityEngine;
using UnityEngine.UI;
using TMPro;
using LightGlue.Unity.Game;
using LightGlue.Unity.Networking;

namespace LightGlue.Unity.Roma.UI
{
    /// <summary>
    /// Roma 场景结果显示 UI（兼容旧 LightGlueManager / 新 RomaManager）。
    /// - 优先绑定 LightGlueManager（旧场景）
    /// - 若不存在则绑定 RomaManager（新场景）
    /// </summary>
    public sealed class RomaResultUIController : MonoBehaviour
    {
        [Header("结果来源（可留空自动查找）")]
        public LightGlueManager lightGlueManager;
        public RomaManager romaManager;

        [Header("UI显示组件（可选）")]
        [Tooltip("综合状态文本（推荐绑定一个 Text 或 TMP_Text 之一）")]
        public Text statusText;
        public TMP_Text statusTmpText;

        [Tooltip("结果有效性状态文本（显示Valid/Invalid）")]
        public Text isValidText;

        [Tooltip("匹配点数量文本")]
        public Text numMatchesText;

        [Tooltip("内点比例文本")]
        public Text inliersRatioText;

        [Tooltip("相机位置X坐标文本")]
        public Text cameraXText;

        [Tooltip("相机位置Y坐标文本")]
        public Text cameraYText;

        [Header("显示设置")]
        [Range(1, 60)]
        public int updateRate = 10;

        public bool showInvalidResults = true;
        public string invalidResultText = "等待有效结果...";

        [Header("格式")]
        [Tooltip("是否按 RomaBridge 日志格式输出到 statusText/statusTmpText")]
        public bool useRomaBridgeLogFormat = true;

        private float _updateInterval;
        private float _lastUpdateTime;
        private LightGlueResult _latestResult;
        private bool _hasResult;

        private enum SourceType { None, LightGlueManager, RomaManager }
        private SourceType _source;

        private void Start()
        {
            _updateInterval = 1.0f / Mathf.Max(1, updateRate);
            _lastUpdateTime = Time.time;

            BindSource();
        }

        private void BindSource()
        {
            if (lightGlueManager == null)
                lightGlueManager = LightGlueManager.Instance;

            if (lightGlueManager != null)
            {
                _source = SourceType.LightGlueManager;
                lightGlueManager.OnResultUpdated += OnResultUpdated;
                if (lightGlueManager.HasLatestResult)
                    OnResultUpdated(lightGlueManager.LatestResult);
                return;
            }

            if (romaManager == null)
                romaManager = RomaManager.Instance;

            if (romaManager != null)
            {
                _source = SourceType.RomaManager;
                romaManager.OnResultUpdated += OnResultUpdated;
                if (romaManager.HasLatestResult)
                    OnResultUpdated(romaManager.LatestResult);
                return;
            }

            _source = SourceType.None;
            Debug.LogError("[RomaResultUI] 未找到 LightGlueManager / RomaManager，无法获取算法结果。");
        }

        private void Update()
        {
            if (Time.time - _lastUpdateTime < _updateInterval)
                return;
            _lastUpdateTime = Time.time;

            if (!_hasResult)
            {
                if (!showInvalidResults)
                    ClearUI();
                return;
            }

            UpdateUI(_latestResult);
        }

        private void UpdateUI(LightGlueResult result)
        {
            if (isValidText != null)
            {
                if (result.IsValid)
                {
                    isValidText.text = "状态: 有效";
                    isValidText.color = Color.green;
                }
                else
                {
                    isValidText.text = "状态: 无效";
                    isValidText.color = Color.red;
                }
            }

            if (numMatchesText != null)
                numMatchesText.text = $"匹配点: {result.NumMatches}";

            if (inliersRatioText != null)
                inliersRatioText.text = $"内点比例: {result.InliersRatio:P1}";

            if (cameraXText != null)
                cameraXText.text = result.IsValid ? $"相机X: {result.CameraPosition.x:F1}" : "相机X: --";
            if (cameraYText != null)
                cameraYText.text = result.IsValid ? $"相机Y: {result.CameraPosition.y:F1}" : "相机Y: --";

            string msg = BuildStatusText(result);
            if (statusText != null)
            {
                statusText.text = msg;
                statusText.color = result.IsValid ? Color.white : Color.yellow;
            }
            if (statusTmpText != null)
            {
                statusTmpText.text = msg;
                statusTmpText.color = result.IsValid ? Color.white : Color.yellow;
            }
        }

        private string BuildStatusText(LightGlueResult result)
        {
            if (!result.IsValid && showInvalidResults && !useRomaBridgeLogFormat)
                return $"无效 | 匹配:{result.NumMatches} | {invalidResultText}";

            if (!useRomaBridgeLogFormat)
            {
                if (result.IsValid)
                    return $"有效 | 匹配:{result.NumMatches} | 内点:{result.InliersRatio:P1} | 位置:({result.CameraPosition.x:F1}, {result.CameraPosition.y:F1})";
                return invalidResultText;
            }

            // 对齐你在 Console 里看到的格式：[RomaBridge] Result: valid=0 matches=500 inliers=0.000 x=0.0 y=0.0
            string prefix = _source == SourceType.LightGlueManager ? "[LightGlue]" : "[RomaBridge]";
            int valid = result.IsValid ? 1 : 0;
            return $"{prefix} Result: valid={valid} matches={result.NumMatches} inliers={result.InliersRatio:F3} x={result.CameraPosition.x:F1} y={result.CameraPosition.y:F1}";
        }

        private void ClearUI()
        {
            if (isValidText != null) isValidText.text = "状态: --";
            if (numMatchesText != null) numMatchesText.text = "匹配点: --";
            if (inliersRatioText != null) inliersRatioText.text = "内点比例: --";
            if (cameraXText != null) cameraXText.text = "相机X: --";
            if (cameraYText != null) cameraYText.text = "相机Y: --";

            if (statusText != null)
            {
                statusText.text = invalidResultText;
                statusText.color = Color.gray;
            }
            if (statusTmpText != null)
            {
                statusTmpText.text = invalidResultText;
                statusTmpText.color = Color.gray;
            }
        }

        private void OnResultUpdated(LightGlueResult result)
        {
            _latestResult = result;
            _hasResult = true;
        }

        private void OnDestroy()
        {
            if (lightGlueManager != null)
                lightGlueManager.OnResultUpdated -= OnResultUpdated;
            if (romaManager != null)
                romaManager.OnResultUpdated -= OnResultUpdated;
        }
    }
}