using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using ln.json;
using ln.logging;
using ln.threading;

namespace ln.build
{
    public class CIJob : PoolJob
    {
        static HttpClient httpClient = new HttpClient();


        public string JobID { get; } = Guid.NewGuid().ToString("N");

        public string RepositoryURL { get; }
        public string RepositoryName { get; }
        public string Commit { get; }
        public string NotifyEMail { get; set; }

        public string WorkingDirectory { get; set; }

        public Logger Logger { get; private set; }

        List<PipeLine> pipeLines = new List<PipeLine>();
        Dictionary<string,string> variables = new Dictionary<string, string>();

        Dictionary<string,MemoryStream> logStreams = new Dictionary<string, MemoryStream>();
        Dictionary<string,Logger> logStreamLoggers = new Dictionary<string, Logger>();

        public CIJob(string repositoryName, string repositoryURL, string commit, string notifyEMail)
        {
            WorkingDirectory = Path.Combine(Path.GetTempPath(), JobID);
            Logger = new Logger(new FileLogger(Path.Combine(Path.GetTempPath(), String.Format("{0}.log", JobID))));
            Logger.Backends.Add(Logger.ConsoleLogger);

            RepositoryName = repositoryName;
            RepositoryURL = repositoryURL;
            Commit = commit;
            NotifyEMail = notifyEMail;
        }

        public Stream GetLogStream(string name)
        {
            if (!logStreams.TryGetValue(name,out MemoryStream logStream))
            {
                logStream = new MemoryStream();
                logStreams.Add(name, logStream);
            }
            return logStream;
        }
        public Logger GetLogger(string name)
        {
            if (!logStreamLoggers.TryGetValue(name, out Logger logStreamLogger))
            {
                logStreamLogger = new Logger(GetLogStream(name));
                logStreamLogger.Backends.Add(Logger.ConsoleLogger);
                logStreamLoggers.Add(name, logStreamLogger);
            }
            return logStreamLogger;
        }

        public string GetVariable(string varName) => GetVariable(varName, null);
        public string GetVariable(string varName,string defValue)
        {
            if (!variables.TryGetValue(varName,out string value))
                value = defValue;
            return value;
        }
        public void SetVariable(string varName,string value)
        {
            if (value != null)
                variables[varName] = value;
            else
                variables.Remove(varName);
        }
        public void ExtendVariable(string varName,string value) => ExtendVariable(varName, value, ':');
        public void ExtendVariable(string varName, string value, char seperator)
        {
            String currentValue = GetVariable(varName, "");
            if (String.Empty.Equals(currentValue))
            {
                currentValue = value;
            } else {
                currentValue = string.Format("{0}{1}{2}",currentValue, seperator, value);
            }
            SetVariable(varName, currentValue);
        }


        public async void UpdateBuildState(BuildState buildState)
        {
            string buildStateURL = String.Format("https://git.l--n.de/api/v1/repos/{0}/{1}/statuses/{2}",
                GetVariable("REPO_OWNER"),
                GetVariable("REPO_NAME"),
                GetVariable("COMMIT_ID")
                );

            if (buildStateURL != null)
            {
                JSONObject stateObject = new JSONObject();
                stateObject.Add("context", "ln.build");
                stateObject.Add("description", "build job pending");
                stateObject.Add("state", buildState.ToString().ToLower());
                stateObject.Add("target_url", JSONNull.Instance);

                HttpResponseMessage response = await httpClient.PostAsync(buildStateURL, new StringContent(stateObject.ToString(),Encoding.UTF8,"application/json"));
                Logger.Log(LogLevel.DEBUG, "UpdateBuildState({0}): {1}", buildState, buildStateURL);
                Logger.Log(LogLevel.DEBUG, "Response: {0}", response );

            }
        }




        public override void RunJob()
        {
            CloneRepository();
            DetectPipelines();

            try{
                foreach (PipeLine pipeLine in pipeLines)
                {
                    pipeLine.Run(this);
                }
                UpdateBuildState(BuildState.SUCCESS);
            } catch (Exception e)
            {
                UpdateBuildState(BuildState.FAILURE);
            }
            
            Notify();
            Cleanup();
        }

        void DetectPipelines()
        {
            string[] sln = Directory.GetFileSystemEntries(WorkingDirectory,"*.sln");
            if (sln.Length > 0)
            {
                pipeLines.Add(new DotNetPipeLine());
            }
        }


        public void CloneRepository()
        {
            Logging.Log("cloning repository to {0}", WorkingDirectory);
            new CommandRunner(Logger, "git", "clone",RepositoryURL,WorkingDirectory).Run();
            new CommandRunner(Logger, "git", "checkout", Commit).Run();
        }

        public void Notify()
        {
        }

        public void Cleanup()
        {
            Directory.Delete(WorkingDirectory, true);
        }


        static CIJob()
        {
            httpClient.DefaultRequestHeaders.Add("Authorization","token 1d03e9577c404b5b4f46b340147b1d500ff95b2e");
        }
    }
}