using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.Xml;

namespace JC.Unity.Picker {
    public class LocationPickerGroup : MonoBehaviour
    {
        [SerializeField] TextAsset xmlFileText;
        [HideInInspector] public LocationParser locationParser;
        public LocationInfo selectLocation;
        public List<LocationPicker> locationPickerList;
        [SerializeField] Button btnClose;
        [SerializeField] Button btnEnter;
        public Action<LocationInfo> onEnter;
        
        void Awake()
        {
            locationParser = new LocationParser(xmlFileText);
            selectLocation = new LocationInfo(locationParser);
            Init();
        }
        void Start()
        {
            if (btnClose) {
                btnClose.onClick.AddListener(() => {
                    Destroy(transform.GetComponentInParent<Canvas>().gameObject);
                });
            }
            if (btnEnter) {
                btnEnter.onClick.AddListener(() => {
                    Destroy(transform.GetComponentInParent<Canvas>().gameObject);
                    onEnter?.Invoke(selectLocation);
                });
            }
        }
        public void Init() {
            for (int i = 0; i < locationPickerList.Count; i++) {
                locationPickerList[i].myGroup = this;
                locationPickerList[i].Init();
            }
            int languageID = PlayerPrefs.GetInt("Language", 0);
            string title = languageID == 0 ? "地区选择" : "Region Select";
            string title0 = languageID == 0 ? "国家" : "Country";
            string title1 = languageID == 0 ? "省" : "State";
            string title2 = languageID == 0 ? "市" : "City";
            transform.Find("TopBar/Title").GetComponent<Text>().text = title;
            transform.Find("TitleBG/Item").GetComponentInChildren<Text>().text = title0;
            transform.Find("TitleBG/Item (1)").GetComponentInChildren<Text>().text = title1;
            transform.Find("TitleBG/Item (2)").GetComponentInChildren<Text>().text = title2;
        }
        public void onDateUpdate() {
            foreach (var item in locationPickerList) {
                item.Refresh();   
            }
        }
        private float _height = -1;
        public float GetHeight() {
            if (_height == -1) {
                _height = transform.GetComponent<RectTransform>().sizeDelta.y;
            }
            return _height;
        }
        // void Test() {
        //     LocationInfo locationInfo = new LocationInfo(locationParser);
        //     while (true) {
        //         if (!locationInfo.IsValid()) {
        //             break;
        //         } else {
        //             while (true) {
        //                 if (!locationInfo.IsValid()) {
        //                     locationInfo.StateIndex = 0;
        //                     break;
        //                 } else {
        //                     while (true) {
        //                         if (!locationInfo.IsValid()) {
        //                             locationInfo.CityIndex = 0;
        //                             break;
        //                         } else {
        //                             Debug.Log(locationInfo.GetCountryRegion().Item1 + "," + locationInfo.GetState().Item1 + "," + locationInfo.GetCity().Item1);
        //                         }
        //                         locationInfo.CityIndex++;
        //                     }
        //                 }
        //                 locationInfo.StateIndex++;
        //             }
        //         }
        //         locationInfo.CountryRegionIndex++;
        //     }
        // }
    }
    public class LocationParser {
        public List<XmlNode> CountryRegionList = new List<XmlNode>();
        public LocationParser(TextAsset xmlFileText) {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(xmlFileText.text);
            XmlNode locationNode = xmlDoc.SelectSingleNode("Location");
            XmlNodeList xmlNodeList = locationNode.SelectNodes("CountryRegion");
            for (int i = 0; i < xmlNodeList.Count; i++) {
                CountryRegionList.Add(xmlNodeList[i]);
            }
        }
    }   
    public class LocationInfo {
        private LocationParser locationParser;
        public int CountryRegionIndex = 0;
        public int StateIndex = 0;
        public int CityIndex = 0; 
        public LocationInfo(LocationParser locationParser, 
                int CountryRegionIndex = 0, int StateIndex = 0, int CityIndex = 0) {
            this.locationParser = locationParser;
            this.CountryRegionIndex = CountryRegionIndex;
            this.StateIndex = StateIndex;
            this.CityIndex = CityIndex;
        }
        public LocationInfo ChangeCountryRegionIndex(int num) {
            return new LocationInfo(locationParser, CountryRegionIndex + num, 0, 0);
        }
        public LocationInfo ChangeStateIndex(int num) {
            return new LocationInfo(locationParser, CountryRegionIndex, StateIndex + num, 0);
        }
        public LocationInfo ChangeCityIndex(int num) {
            return new LocationInfo(locationParser, CountryRegionIndex, StateIndex, CityIndex + num);
        }
        public Tuple<string, string> GetCountryRegion() {
            string Name = locationParser.CountryRegionList[CountryRegionIndex].Attributes["Name"].Value;
            string Code = locationParser.CountryRegionList[CountryRegionIndex].Attributes["Code"].Value;
            return new Tuple<string, string>(Name, Code); 
        }
        public Tuple<string, string> GetState() {
            string Name = "";
            string Code = "";
            XmlNode countryRegionNode = locationParser.CountryRegionList[CountryRegionIndex];
            XmlNodeList stateList = countryRegionNode.SelectNodes("State");
            if (stateList.Count != 0) {
                XmlNode stateNode = stateList[StateIndex];
                XmlAttribute NameAtb = stateNode.Attributes["Name"];
                if (NameAtb != null) {
                    Name = NameAtb.Value;
                }
                XmlAttribute CodeAtb = stateNode.Attributes["Code"];
                if (CodeAtb != null) {
                    Code = CodeAtb.Value;
                }
            }
            return new Tuple<string, string>(Name, Code);
        }  
        public Tuple<string, string> GetCity() {
            string Name = "";
            string Code = "";
            XmlNode countryRegionNode = locationParser.CountryRegionList[CountryRegionIndex];
            XmlNodeList stateList = countryRegionNode.SelectNodes("State");
            if (stateList.Count != 0) {
                XmlNode stateNode = stateList[StateIndex];
                XmlNodeList cityList = stateNode.SelectNodes("City");
                if (cityList.Count != 0) {
                    XmlNode cityNode = cityList[CityIndex];
                    XmlAttribute NameAtb = cityNode.Attributes["Name"];
                    if (NameAtb != null) {
                        Name = NameAtb.Value;
                    }
                    XmlAttribute CodeAtb = cityNode.Attributes["Code"];
                    if (CodeAtb != null) {
                        Code = CodeAtb.Value;
                    }
                } 
            }
            return new Tuple<string, string>(Name, Code);
        }  
        public bool IsValid() {
            if (CountryRegionIndex < 0 || StateIndex < 0 || CityIndex < 0) {
                return false;
            }
            bool res1 = CountryRegionIndex < locationParser.CountryRegionList.Count;
            if (!res1) return false;
            XmlNode countryRegionNode = locationParser.CountryRegionList[CountryRegionIndex];
            XmlNodeList stateList = countryRegionNode.SelectNodes("State");
            if (stateList.Count == 0 && StateIndex == 0 && CityIndex == 0) return true;
            bool res2 = StateIndex < stateList.Count;
            if (!res2) return false;
            XmlNode stateNode = stateList[StateIndex];
            XmlNodeList cityList = stateNode.SelectNodes("City");
            if (cityList.Count == 0 && CityIndex == 0) return true;
            bool res3 = CityIndex < cityList.Count;
            if (!res3) return false;
            return true;
        }
    }
}