using System.Collections.Generic;

namespace Guru.Editor
{
    using System.Xml;
    using System.IO;
    using UnityEngine;
    
    /// <summary>
    /// Android 配置修改器
    /// </summary>
    public class MainManifestDoc
    {
        private const string TargetPath = "Plugins/Android/AndroidManifest.xml";
        private const string XmlnsAndroid = "xmlns:android";
        private const string NamespaceAndroid = "http://schemas.android.com/apk/res/android";
        private const string XmlnsTools= "xmlns:tools";
        private const string NamespaceTools = "http://schemas.android.com/tools";
        
        
        
        private XmlDocument _doc;
        public XmlDocument Doc => _doc;

        private string _docPath;
        private bool _isReady = false;
        
        private XmlElement _manifestNode;
        private XmlElement _applicationNode;
        private XmlNodeList _metadataList;
        private XmlNodeList _permissionList;

        
        #region Initiallize
        
        /// <summary>
        /// 加载文件
        /// </summary>
        /// <param name="docPath"></param>
        /// <returns></returns>
        public static MainManifestDoc Load(string docPath = "")
        {
            if (string.IsNullOrEmpty(docPath))
            {
                docPath = Path.GetFullPath(Path.Combine(Application.dataPath, TargetPath));
            }

            if (!File.Exists(docPath))
            {
                Debug.LogError($"--- File not found: {docPath}");
                return null;
            }

            var mod = new MainManifestDoc();
            mod.ReadFromPath(docPath);
            return mod;
        }

        public static MainManifestDoc Read(string xmlStr, string docPath = "")
        {
            var mod = new MainManifestDoc();
            mod.ReadFromXml(xmlStr, docPath);
            return mod;
        }
        

        /// <summary>
        /// 从文件路径读取
        /// </summary>
        /// <param name="docPath"></param>
        public void ReadFromPath(string docPath)
        {
            _isReady = false;
            if (File.Exists(_docPath))
            {
                _docPath = docPath;
                var xmlStr = File.ReadAllText(docPath);
                ReadFromXml(xmlStr);
            }
        }


        public void ReadFromXml(string xmlStr, string docPath = "")
        {
            _doc = new XmlDocument();
            _doc.LoadXml(xmlStr);
            Init();
        }


        /// <summary>
        /// Initializes the Doc
        /// </summary>
        private void Init()
        {
            // --- Root Nodes ---
            _manifestNode = _doc.SelectSingleNode("manifest") as XmlElement;
            _applicationNode = _doc.SelectSingleNode("manifest/application") as XmlElement;
            // --- Metadatas ---
            _metadataList = _applicationNode.SelectNodes("meta-data");
            // --- Permissions ---
            _permissionList = _applicationNode.SelectNodes("uses-permission");

            AddXmlnsAndroid();
            AddXmlnsTools();
            _isReady = true;
        }

        /// <summary>
        /// Save Doc
        /// </summary>
        public void Save(string docPath = "")
        {
            if (_isReady)
            {
                if(string.IsNullOrEmpty(docPath)) docPath = _docPath;
                if (!string.IsNullOrEmpty(docPath))
                {
                    var dir = Directory.GetParent(docPath);
                    if(!dir.Exists) dir.Create();
                    _doc.Save(_docPath);

                }

            }
        }

        #endregion

        #region Node Opreation

        
        public static bool AddAttribute(XmlElement node, string key, string value)
        {
            if (node != null)
            {
                if (node.HasAttribute(key))
                {
                    node.Attributes[key].Value = value;
                }
                else
                {
                    node.SetAttribute(key, value);
                }
                return true;
            }
            return false;
        }
        
        

        #endregion
        

        #region API

        public bool AddXmlnsAndroid()
        {
            return AddAttribute(_manifestNode, XmlnsAndroid, NamespaceAndroid);
        }
        
        public bool AddXmlnsTools()
        {
            return AddAttribute(_manifestNode, XmlnsTools, NamespaceTools);
        }
        
        /// <summary>
        /// Add Replace Item
        /// </summary>
        /// <param name="item"></param>
        public void AddReplaceItem(string item)
        {
            if (_manifestNode != null)
            {
                List<string> items = new List<string>(5);
                if (_manifestNode.HasAttribute("replace", NamespaceTools))
                {
                    var arr = _manifestNode.GetAttribute("replace",NamespaceTools).Split(',');
                    if(arr != null && arr.Length > 0)
                    {
                        items.AddRange(arr);
                    }
                }

                if (!items.Contains(item)) items.Add(item);
                
                _manifestNode.SetAttribute("replace",  NamespaceTools, string.Join(",", items));
            }
        }


        /// <summary>
        /// Set metadata
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void SetMetadata(string key, string value)
        {
            _metadataList = _applicationNode?.SelectNodes("meta-data") ?? null;
            
            XmlElement item = null;
            if (_metadataList != null)
            {
                foreach (XmlElement e in _metadataList)
                {
                    // var nm =    e.GetAttribute("name", NamespaceAndroid);
                    if (e.GetAttribute("name", NamespaceAndroid) is string k && k == key)
                    {
                        item = e;
                        break;
                    }
                }
            }

            if (item == null)
            {
                item = _doc.CreateElement("meta-data");
                _applicationNode?.AppendChild(item);
            }
            
            item.SetAttribute("name", NamespaceAndroid, key);
            item.SetAttribute("value", NamespaceAndroid, value);
        }


        #endregion



        #region Output


        public override string ToString()
        {
            if (_doc != null) return _doc.InnerXml;
            return this.ToString();
        }


        #endregion
        
        
        
        





    }
}