using System;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace Ichni.NodeScript
{
    public class NodeUIBuilder
    {
        Transform parent;
        GameObject dropdownPrefab;
        GameObject inputPrefab;

        public NodeUIBuilder(Transform parent, GameObject dropdownPrefab, GameObject inputPrefab)
        {
            this.parent = parent;
            this.dropdownPrefab = dropdownPrefab;
            this.inputPrefab = inputPrefab;
        }

        public NodeUIBuilder Dropdown(string label, string[] options, int defaultIndex, Action<int> onChanged)
        {
            if (parent == null || dropdownPrefab == null || options == null || options.Length == 0) return this;

            var go = UnityEngine.Object.Instantiate(dropdownPrefab, parent);
            go.name = "dd_" + label;

            var dd = go.GetComponentInChildren<TMP_Dropdown>();
            if (dd != null)
            {
                dd.ClearOptions();
                foreach (var o in options) dd.options.Add(new TMP_Dropdown.OptionData(o));
                dd.value = defaultIndex;
                dd.onValueChanged.AddListener(i => onChanged?.Invoke(i));
            }

            var lbl = go.GetComponentInChildren<TMP_Text>();
            if (lbl != null && lbl.transform != dd?.transform) lbl.text = label;

            return this;
        }

        public NodeUIBuilder FloatField(string label, float defaultValue, Action<float> onChanged)
        {
            if (parent == null || inputPrefab == null) return this;

            var go = UnityEngine.Object.Instantiate(inputPrefab, parent);
            go.name = "inp_" + label;

            var input = go.GetComponentInChildren<TMP_InputField>();
            if (input != null)
            {
                input.text = defaultValue.ToString("0.##");
                input.contentType = TMP_InputField.ContentType.DecimalNumber;
                input.onValueChanged.AddListener(s =>
                {
                    if (float.TryParse(s, out float v)) onChanged?.Invoke(v);
                });
            }

            var lbl = go.GetComponentInChildren<TMP_Text>();
            if (lbl != null && lbl.transform != input?.transform) lbl.text = label;

            return this;
        }

        /// <summary>类型选择下拉（NodeConst / NodeCombine 用）</summary>
        public NodeUIBuilder TypeDropdown(string[] options, int defaultIndex, Action<int> onChanged)
        {
            return Dropdown("Type", options, defaultIndex, onChanged);
        }

        /// <summary>Bool 开关（NodeSelect 的 condition 备选）</summary>
        public NodeUIBuilder Toggle(string label, bool defaultValue, Action<bool> onChanged)
        {
            if (parent == null || dropdownPrefab == null) return this;

            var go = UnityEngine.Object.Instantiate(dropdownPrefab, parent);
            go.name = "tgl_" + label;

            var dd = go.GetComponentInChildren<TMP_Dropdown>();
            if (dd != null)
            {
                dd.ClearOptions();
                dd.options.Add(new TMP_Dropdown.OptionData("False"));
                dd.options.Add(new TMP_Dropdown.OptionData("True"));
                dd.value = defaultValue ? 1 : 0;
                dd.onValueChanged.AddListener(i => onChanged?.Invoke(i == 1));
            }

            var lbl = go.GetComponentInChildren<TMP_Text>();
            if (lbl != null && lbl.transform != dd?.transform) lbl.text = label;

            return this;
        }
    }
}