using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;

#if UNITY_XCODE_API_BUILD
namespace UnityEditor.iOS.Xcode
#else
namespace UnityEditor.iOS.Xcode.Custom
#endif
{
    internal class XcScheme
    {
        XDocument m_Doc;

        // Returns the current build configuration. Returns null if it is not set.
        public string GetBuildConfiguration()
        {
            var el = m_Doc.Root.XPathSelectElement("./LaunchAction");
            if (el == null)
                throw new Exception("The xcscheme document does not contain build configuration setting");
            var attr = el.Attribute("buildConfiguration");
            if (attr == null)
                return null;
            return attr.Value;
        }

        public void SetBuildConfiguration(string buildConfigName)
        {
            var el = m_Doc.Root.XPathSelectElement("./LaunchAction");
            if (el == null)
                throw new Exception("The xcscheme document does not contain build configuration setting");
            el.SetAttributeValue("buildConfiguration", buildConfigName);
        }
 
        public void ReadFromFile(string path)
        {
            ReadFromString(File.ReadAllText(path));
        }

        public void ReadFromStream(TextReader tr)
        {
            ReadFromString(tr.ReadToEnd());
        }

        public void ReadFromString(string text)
        {
            m_Doc = PlistDocument.ParseXmlNoDtd(text);
        }

        public void WriteToFile(string path)
        {
            System.Text.Encoding utf8WithoutBom = new System.Text.UTF8Encoding(false);
            File.WriteAllText(path, WriteToString(), utf8WithoutBom);
        }

        public void WriteToStream(TextWriter tw)
        {
            tw.Write(WriteToString());
        }

        public string WriteToString()
        {
            return PlistDocument.CleanDtdToString(m_Doc, null).Replace("\r\n", "\n");
        }        
    }

} // namespace UnityEditor.iOS.XCode