using UnityEngine;
using UnityEngine.UI;
using TMPro;

namespace AibisDream.UI
{
    [ExecuteAlways]
    public class ProgressBar : MonoBehaviour
    {
        [SerializeField]
        float currentValue = 0f;

        [SerializeField]
        float maxValue = 100.0f;

        [SerializeField]
        bool hasText = true;

        [SerializeField]
        TextMeshProUGUI text;

        [SerializeField]
        RectTransform foreground;

        [SerializeField]
        RectTransform foregroundArea;

        [SerializeField]
        Vector2Int validRange = new Vector2Int(20, 80);

        [SerializeField]
        Color normalColor = Color.green;

        [SerializeField]
        Color abnormalColor = Color.red;

        [SerializeField]
        RectTransform rangeMarker;

        [SerializeField]
        Image foregroundImage;

        bool bDelayedUpdate = false;
        
        public float CurrentValue
        {
            get => currentValue;
            set
            {
                if(currentValue == value)
                {
                    return;
                }
                currentValue = value;
                OnValueChanged();
            }
        }
        
        public float MaxValue
        {
            get => maxValue;
            set
            {
                if(maxValue == value)
                {
                    return;
                }
                maxValue = value;
                OnValueChanged();
            }
        }

        public bool HasText
        {
            get => hasText;
            set
            {
                if (hasText == value)
                {
                    return;
                }
                hasText = value;
                UpdateText();
            }
        }

        public Vector2Int ValidRange
        {
            get => validRange;
            set
            {
                if (validRange == value)
                {
                    return;
                }
                validRange = value;
                ValidateRange();
                OnValueChanged();
            }
        }

        void OnValueChanged()
        {
            if(maxValue < 0)
            {
                maxValue = 100.0f;
            }
            if(currentValue < 0)
            {
                currentValue = 0f;
            }
            currentValue = Mathf.Clamp(currentValue, 0, maxValue);
            UpdateGUI();
        }

        void Start(){
            UpdateGUI();
        }

        void Update()
        {
            if(Application.isPlaying)
            {
                UpdateGUI();
            }
            else
            {
                if(bDelayedUpdate)
                {
                    bDelayedUpdate = false;
                    OnValueChanged();
                } 
            }  
        }
             
        void UpdateGUI()
        {            
            UpdateForeground();  
            UpdateRangeMarker();
            UpdateText();
        }

        void UpdateForeground()
        {
            if (foreground == null || foregroundArea == null)
            {
                return;
            }

            float maxWidth = foregroundArea.rect.width;
            Vector2 offsetMax = foreground.offsetMax;
            offsetMax.x = -(maxWidth - maxWidth*(currentValue / maxValue));
            foreground.offsetMax = offsetMax;

            // 根据范围检查结果设置颜色
            if (foregroundImage != null)
            {
                foregroundImage.color = IsInRange(currentValue) ? normalColor : abnormalColor;
            }
        }

        void UpdateRangeMarker()
        {
            if (rangeMarker == null || foregroundArea == null || maxValue <= 0)
            {
                return;
            }

            float maxWidth = foregroundArea.rect.width;
            float rangeStart = validRange.x / maxValue * maxWidth;
            float rangeWidth = (validRange.y - validRange.x) / maxValue * maxWidth;

            // 设置范围标记的位置和大小
            Vector2 offsetMin = rangeMarker.offsetMin;
            Vector2 offsetMax = rangeMarker.offsetMax;
            
            offsetMin.x = rangeStart;
            offsetMax.x = -(maxWidth - rangeStart - rangeWidth);
            
            rangeMarker.offsetMin = offsetMin;
            rangeMarker.offsetMax = offsetMax;
        }

        void UpdateText()
        {
            if (text != null && text.gameObject.activeSelf != hasText)
            {
                text.gameObject.SetActive(hasText);
            }
            if (hasText && (text != null))
            {
                text.text = Mathf.Floor(currentValue) +"/"+ Mathf.Floor(maxValue);
            }
        }

        bool IsInRange(float value)
        {
            return value >= validRange.x && value <= validRange.y;
        }

        void ValidateRange()
        {
            if (validRange.x < 0)
            {
                validRange.x = 0;
            }
            if (validRange.y > maxValue)
            {
                validRange.y = Mathf.RoundToInt(maxValue);
            }
            if (validRange.x > validRange.y)
            {
                validRange.x = validRange.y;
            }
        }

        #if UNITY_EDITOR
        protected void OnValidate()
        {
            ValidateRange();
            bDelayedUpdate = true;    
        }
        #endif
    }
}