#if UNITY_EDITOR
using System;
using System.Collections.Generic;
using System.Net.Http;
using UnityEditor;
using UnityEngine;
using OnDeviceAgent.AgentCore;
namespace OnDeviceAgent.AgentCore.Editor
{

    [CustomPropertyDrawer(typeof(OllamaModelDropdownAttribute))]
    public sealed class OllamaModelDropdownDrawer : PropertyDrawer
    {
        static readonly Dictionary<string, string[]> s_Cache = new Dictionary<string, string[]>();
        static readonly Dictionary<string, double> s_CacheAt = new Dictionary<string, double>();
        static readonly HttpClient s_Http = new HttpClient { Timeout = TimeSpan.FromSeconds(1.5) };
        const double CacheSeconds = 30.0;

        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            if (property.propertyType != SerializedPropertyType.String)
            {
                EditorGUI.PropertyField(position, property, label);
                return;
            }

            var attr = (OllamaModelDropdownAttribute)attribute;
            var endpoint = ResolveEndpoint(attr, property);
            var current = property.stringValue ?? string.Empty;
            var models = GetModels(endpoint);

            var options = new List<string>(models.Length + 1);
            if (!string.IsNullOrEmpty(current) && Array.IndexOf(models, current) < 0)
                options.Add(current + "  (not in /api/tags)");
            options.AddRange(models);
            if (options.Count == 0)
                options.Add(string.IsNullOrEmpty(current) ? "(no models)" : current);

            var selectedIndex = 0;
            for (var i = 0; i < options.Count; i++)
            {
                var name = options[i];
                var marker = name.IndexOf("  (not in", StringComparison.Ordinal);
                var bare = marker >= 0 ? name.Substring(0, marker) : name;
                if (bare == current) { selectedIndex = i; break; }
            }

            const float refreshWidth = 22f;
            var popupRect = new Rect(position.x, position.y, position.width - refreshWidth - 2f, position.height);
            var refreshRect = new Rect(position.xMax - refreshWidth, position.y, refreshWidth, position.height);

            EditorGUI.BeginChangeCheck();
            var newIndex = EditorGUI.Popup(popupRect, label, selectedIndex, ToGuiContents(options));
            if (EditorGUI.EndChangeCheck())
            {
                var chosen = options[newIndex];
                var marker = chosen.IndexOf("  (not in", StringComparison.Ordinal);
                property.stringValue = marker >= 0 ? chosen.Substring(0, marker) : chosen;
            }

            if (GUI.Button(refreshRect, new GUIContent("↻", "Refresh models from " + endpoint)))
            {
                s_CacheAt[endpoint] = 0;
                GetModels(endpoint);
                EditorWindow.focusedWindow?.Repaint();
            }
        }

        static GUIContent[] ToGuiContents(List<string> items)
        {
            var arr = new GUIContent[items.Count];
            for (var i = 0; i < items.Count; i++)
                arr[i] = new GUIContent(items[i]);
            return arr;
        }

        static string ResolveEndpoint(OllamaModelDropdownAttribute attr, SerializedProperty property)
        {
            if (!string.IsNullOrWhiteSpace(attr.EndpointField))
            {
                var sibling = property.serializedObject.FindProperty(attr.EndpointField);
                if (sibling != null
                    && sibling.propertyType == SerializedPropertyType.String
                    && !string.IsNullOrWhiteSpace(sibling.stringValue))
                    return sibling.stringValue.Trim();
            }
            return string.IsNullOrWhiteSpace(attr.Endpoint) ? "http://localhost:11434" : attr.Endpoint.Trim();
        }

        static string[] GetModels(string endpoint)
        {
            if (s_Cache.TryGetValue(endpoint, out var cached)
                && s_CacheAt.TryGetValue(endpoint, out var at)
                && EditorApplication.timeSinceStartup - at < CacheSeconds)
                return cached;

            var result = Array.Empty<string>();
            try
            {
                var url = endpoint.TrimEnd('/') + "/api/tags";
                var json = s_Http.GetStringAsync(url).GetAwaiter().GetResult();
                var parsed = JsonUtility.FromJson<TagsResponse>(json);
                if (parsed != null && parsed.models != null)
                {
                    var names = new List<string>(parsed.models.Length);
                    for (var i = 0; i < parsed.models.Length; i++)
                    {
                        var n = parsed.models[i] != null ? parsed.models[i].name : null;
                        if (!string.IsNullOrEmpty(n))
                            names.Add(n);
                    }
                    names.Sort(StringComparer.Ordinal);
                    result = names.ToArray();
                }
            }
            catch
            {
                // Endpoint unreachable, non-fatal; current value is preserved.
            }

            s_Cache[endpoint] = result;
            s_CacheAt[endpoint] = EditorApplication.timeSinceStartup;
            return result;
        }

        [Serializable] sealed class TagsResponse { public TagEntry[] models; }
        [Serializable] sealed class TagEntry { public string name; }
    }
}
#endif