using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using ln.build.commands;
using ln.build.semver;
using ln.json;
using ln.logging;

namespace ln.build.pipeline
{

    public class DefaultPipeLine
    {
        public CommandEnvironment CommandEnvironment { get; }
        public CIService CIService { get; }

        List<Stage> stages = new List<Stage>();
        public IEnumerable<Stage> Stages => stages;

        public Versioning Versioning { get; set; }

        List<string> loadedTemplates = new List<string>();
        public IEnumerable<string> LoadedTemplates => loadedTemplates;

        public DefaultPipeLine(CIService ciService)
        {
            CIService = ciService;
            CommandEnvironment = new CommandEnvironment();
        }
        public DefaultPipeLine(CIService ciService, CommandEnvironment commandEnvironment)
        {
            CIService = ciService;
            CommandEnvironment = new CommandEnvironment(commandEnvironment);
        }

        public void LoadJson(JSONObject jsonPipeLine)
        {
            if (jsonPipeLine.ContainsKey("templates"))
            {
                foreach (JSONString jsonTemplateName in jsonPipeLine["templates"].Children)
                {
                    if (!loadedTemplates.Contains(jsonTemplateName.Value))
                    {
                        loadedTemplates.Add(jsonTemplateName.Value);

                        string repoTemplate = Path.Combine(CommandEnvironment.WorkingDirectory, String.Format("{0}.ln", jsonTemplateName.Value));
                        string systemTemplate = Path.Combine(CIService.ContextDirectory, "scripts", "pipeline", String.Format("{0}.ln", jsonTemplateName.Value));
    
                        if (File.Exists(repoTemplate))
                        {
                            LoadJson(JSONParser.ParseFile(repoTemplate) as JSONObject);
                        } else if (File.Exists(systemTemplate))
                        {
                            LoadJson(JSONParser.ParseFile(systemTemplate) as JSONObject);
                        } else
                            throw new FileNotFoundException(String.Format("{0}.ln", jsonTemplateName.Value));
                    }
                }
            }

            if (jsonPipeLine.ContainsKey("env"))
                CommandEnvironment.Apply(jsonPipeLine["env"] as JSONObject);

            if (jsonPipeLine.ContainsKey("stages"))
            {
                JSONArray jsonStages = jsonPipeLine["stages"] as JSONArray;
                foreach (JSONObject jsonStage in jsonStages.Children)
                {
                    Stage stage = GetStage(jsonStage["name"].ToNative().ToString());
                    stage.LoadJson(jsonStage);
                }
            }

            if (jsonPipeLine.ContainsKey("versioning"))
                Versioning = new Versioning(jsonPipeLine["versioning"] as JSONObject);
        }

        public void Run()
        {
            foreach (Stage stage in stages)
            {
                CommandEnvironment.Logger.Log(LogLevel.INFO,"-------------------------------------------------------------------------------------");
                CommandEnvironment.Logger.Log(LogLevel.INFO,"STAGE: {0}", stage.Name);
                CommandEnvironment.Logger.Log(LogLevel.INFO,"-------------------------------------------------------------------------------------");
                stage.Run();
            }
        }

        public Stage GetStage(string stageName)
        {
            foreach (Stage stage in stages)
            {
                if (stageName.Equals(stage.Name))
                    return stage;
            }

            Stage _stage = new Stage(this);
            _stage.Name = stageName;
            stages.Add(_stage);
            return _stage;
        }

    }

    public class Stage
    {
        public DefaultPipeLine PipeLine { get; }
        public string Name { get; set; }
        public int Priority { get; set; }

        public CommandEnvironment CommandEnvironment { get; }

        public List<string> commands = new List<string>();

        public Stage(DefaultPipeLine pipeLine)
        {
            PipeLine = pipeLine;
            CommandEnvironment = new CommandEnvironment(pipeLine.CommandEnvironment);
        }

        public void LoadJson(JSONObject jsonStage)
        {
            Name = jsonStage["name"].ToNative().ToString();
            if (jsonStage.ContainsKey("priority"))
                Priority = (int)(long)jsonStage["priority"].ToNative();

            if (jsonStage.ContainsKey("env"))
            {
                CommandEnvironment.Apply(jsonStage["env"] as JSONObject);
            }
            if (jsonStage.ContainsKey("commands"))
            {
                JSONArray jsonCommands = jsonStage["commands"] as JSONArray;
                foreach (JSONValue jsonValue in jsonCommands.Children)
                {
                    Logging.Log(LogLevel.DEBUG, "stage {0} command: {1}", Name, jsonValue.ToNative().ToString());
                    commands.Add(jsonValue.ToNative().ToString());
                }
            }
            if (jsonStage.ContainsKey("secrets"))
            {
                JSONObject jsonSecrets = jsonStage["secrets"] as JSONObject;
                foreach (string key in jsonSecrets.Keys)
                {
                    CommandEnvironment.Set(key, CommandEnvironment.SecretStorage?.GetSecret(jsonSecrets[key]?.ToNative()?.ToString()));
                }
            }
        }


        public void Run()
        {
            foreach (string command in commands)
                PipeLine.CIService.StageCommands.Run(this, command.Split());
        }
    }

}