using Microsoft.AspNetCore.Mvc;
using System.Reflection.Emit;
using System.Xml;
using System.Xml.Linq;


namespace AddressPaser.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class PatentGetterController : ControllerBase
    {
        [HttpGet(Name = "GetPatentbyAppNo")]
        public List<string> GetPatentbyAppNo(string appNo)
        {
            IPRS.xiaoshi.sz.com.IPRSSearcher searcher = new IPRS.xiaoshi.sz.com.IPRSSearcher();
            string retXml = searcher.GetPatentFullTxtInfo(appNo);
            
            List<string> technicalFieldTexts = new List<string>();
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(retXml);

            XmlNamespaceManager nsManager = new XmlNamespaceManager(xmlDoc.NameTable);
            nsManager.AddNamespace("business", "http://www.sipo.gov.cn/XMLSchema/business");
            nsManager.AddNamespace("base", "http://www.sipo.gov.cn/XMLSchema/base");

            // XPath to find all <p> tags within <technical-field>
            XmlNodeList TNodes = xmlDoc.SelectNodes("//cn-patent-document/application-body/description/technical-field/p");

            

            if (TNodes != null)
            {
                if (TNodes.Count != 0)
                {
                    foreach (XmlNode pNode in TNodes)
                    {
                        // Extract the text content of each <p> tag
                        technicalFieldTexts.Add(pNode.InnerText.Trim());
                    }
                }
                else
                {
                    // 选择所有 business:Description 下的 base:Paragraphs 节点
                    XmlNodeList paragraphs = xmlDoc.DocumentElement.SelectNodes("//business:Description/base:Paragraphs",
                        nsManager
                    );

                    // 遍历节点提取内容
                    foreach (XmlNode para in paragraphs)
                    {
                        technicalFieldTexts.Add(para.InnerText);
                    }
                }
            }
            

            // XPath to find all <p> tags within <technical-field>
            XmlNodeList BNodes = xmlDoc.SelectNodes("//cn-patent-document/application-body/description/background-art/p");

            if (TNodes != null)
            {
                foreach (XmlNode pNode in BNodes)
                {
                    // Extract the text content of each <p> tag
                    technicalFieldTexts.Add(pNode.InnerText.Trim());
                }
            }

            // XPath to find all <p> tags within <technical-field>
            XmlNodeList DNodes = xmlDoc.SelectNodes("//cn-patent-document/application-body/description/disclosure/p");

            if (TNodes != null)
            {
                foreach (XmlNode pNode in DNodes)
                {
                    // Extract the text content of each <p> tag
                    technicalFieldTexts.Add(pNode.InnerText.Trim());
                }
            }

            // XPath to find all <p> tags within <technical-field>
            XmlNodeList MNodes = xmlDoc.SelectNodes("//cn-patent-document/application-body/description/mode-for-invention/p");

            if (TNodes != null)
            {
                foreach (XmlNode pNode in MNodes)
                {
                    // Extract the text content of each <p> tag
                    technicalFieldTexts.Add(pNode.InnerText.Trim());
                }
            }

            if(technicalFieldTexts.Count == 0)
            {
                // XPath to find all <p> tags within <technical-field>
                XmlNodeList desNodes = xmlDoc.SelectNodes("//cn-patent-document/application-body/description/p");

                if (TNodes != null)
                {
                    foreach (XmlNode pNode in desNodes)
                    {
                        // Extract the text content of each <p> tag
                        technicalFieldTexts.Add(pNode.InnerText.Trim());
                    }
                }
            }


            return technicalFieldTexts;
        }
    }
}