using TMPro;
using UnityEngine;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace AppUI.Util.Input
{
    /// <summary>
    /// 挂在包含 <see cref="TMP_InputField"/> 的物体上（可与输入框同物体或手动引用）。
    /// 绑定清空按钮与密码可见切换按钮；可选为按钮上的 Graphic 设置「两种状态」自定义颜色。
    /// </summary>
    [DisallowMultipleComponent]
    public class TMP_InputFieldActionBar : MonoBehaviour
    {
        [Header("输入框")]
        [SerializeField]
        TMP_InputField inputField;

        [Header("清空")]
        [SerializeField]
        Button clearButton;

        [Tooltip("用于变色：可为按钮子物体上的 Image / RawImage 等；不填则尝试用 Button.targetGraphic")]
        [SerializeField]
        Graphic clearTintTarget;

        [SerializeField]
        bool clearUseTwoColors = true;

        [SerializeField]
        Color clearWhenEmptyColor = new Color(1f, 1f, 1f, 0.35f);

        [SerializeField]
        Color clearWhenHasTextColor = Color.white;

        [FormerlySerializedAs("hideClearButtonWhenEmpty")]
        [SerializeField]
        bool hideClearWhenEmpty;

        [Header("密码显示/隐藏")]
        [SerializeField]
        Button passwordToggleButton;

        [Tooltip("用于变色：不填则尝试用 Button.targetGraphic")]
        [SerializeField]
        Graphic passwordTintTarget;

        [SerializeField]
        bool passwordUseTwoColors = true;

        [SerializeField]
        Color passwordConcealedColor = Color.white;

        [SerializeField]
        Color passwordRevealedColor = new Color(0.4f, 0.75f, 1f, 1f);

        [Tooltip("绑定密码切换按钮时：进入界面是否强制为密文（默认隐藏密码）。关闭则可沿用输入框上原有的 Content Type")]
        [SerializeField]
        bool passwordStartsConcealed = true;

        bool _passwordRevealed;

        void Awake()
        {
            if (inputField == null)
                inputField = GetComponent<TMP_InputField>();
        }

        void OnEnable()
        {
            if (inputField != null)
                inputField.onValueChanged.AddListener(OnInputValueChanged);

            if (clearButton != null)
                clearButton.onClick.AddListener(OnClearClicked);

            if (passwordToggleButton != null)
                passwordToggleButton.onClick.AddListener(OnPasswordToggleClicked);

            ApplyPasswordInitialState();
            RefreshClearUi();
            RefreshPasswordTint();
        }

        void OnDisable()
        {
            if (inputField != null)
                inputField.onValueChanged.RemoveListener(OnInputValueChanged);

            if (clearButton != null)
                clearButton.onClick.RemoveListener(OnClearClicked);

            if (passwordToggleButton != null)
                passwordToggleButton.onClick.RemoveListener(OnPasswordToggleClicked);
        }

        void OnInputValueChanged(string _)
        {
            RefreshClearUi();
        }

        void OnClearClicked()
        {
            if (inputField == null)
                return;

            inputField.text = string.Empty;
            inputField.ActivateInputField();
            RefreshClearUi();
        }

        void OnPasswordToggleClicked()
        {
            if (inputField == null || passwordToggleButton == null)
                return;

            _passwordRevealed = !_passwordRevealed;
            ApplyPasswordContentType();
            inputField.ForceLabelUpdate();
            RefreshPasswordTint();
        }

        void ApplyPasswordInitialState()
        {
            if (inputField == null)
                return;

            if (passwordToggleButton == null)
                return;

            if (passwordStartsConcealed)
            {
                _passwordRevealed = false;
                ApplyPasswordContentType();
                inputField.ForceLabelUpdate();
            }
            else
                SyncPasswordStateFromField();
        }

        void SyncPasswordStateFromField()
        {
            if (inputField == null)
                return;

            _passwordRevealed = inputField.contentType != TMP_InputField.ContentType.Password;
        }

        void ApplyPasswordContentType()
        {
            inputField.contentType = _passwordRevealed
                ? TMP_InputField.ContentType.Standard
                : TMP_InputField.ContentType.Password;
        }

        void RefreshClearUi()
        {
            if (inputField == null)
                return;

            bool hasText = !string.IsNullOrEmpty(inputField.text);

            if (hideClearWhenEmpty && clearButton != null)
                clearButton.gameObject.SetActive(hasText);

            if (clearUseTwoColors)
                ApplyTint(GetClearTintGraphic(), hasText ? clearWhenHasTextColor : clearWhenEmptyColor);
        }

        void RefreshPasswordTint()
        {
            if (!passwordUseTwoColors || passwordToggleButton == null)
                return;

            ApplyTint(GetPasswordTintGraphic(), _passwordRevealed ? passwordRevealedColor : passwordConcealedColor);
        }

        Graphic GetClearTintGraphic()
        {
            if (clearTintTarget != null)
                return clearTintTarget;
            return clearButton != null ? clearButton.targetGraphic : null;
        }

        Graphic GetPasswordTintGraphic()
        {
            if (passwordTintTarget != null)
                return passwordTintTarget;
            return passwordToggleButton != null ? passwordToggleButton.targetGraphic : null;
        }

        static void ApplyTint(Graphic g, Color c)
        {
            if (g != null)
                g.color = c;
        }

#if UNITY_EDITOR
        void OnValidate()
        {
            if (inputField == null)
                inputField = GetComponent<TMP_InputField>();
        }
#endif
    }
}