using System;
using System.Collections.Generic;
using System.IO;
using System.Text.Json.Serialization;
using ln.logging;

namespace ln.build 
{

    public class PipeLine
    {

        List<Step> steps = new List<Step>();

        public PipeLine()
        {
        }

        public void AddStep(Step step) => steps.Add(step);

        public virtual void Run(CIJob job)
        {
            job.Logger.Log(LogLevel.INFO,"PipeLine [{0}] start",GetType().Name);

            foreach (Step step in steps)
            {
                if (step.Run(job) != 0)
                    break;
            }

            job.Logger.Log(LogLevel.INFO,"PipeLine [{0}] ended", GetType().Name);
        }

        public abstract class Step
        {
            public string Name { get; }
            public Step(string stepName)
            {
                Name = stepName;
            }

            public abstract int Run(CIJob job);

            public string DefaultLogFileName => String.Format("step.{0}.log", Name);
        }

    }

    public delegate void CommandExitedDelegate(CommandStep commandStep, CIJob job, int exitCode);
    public class CommandStep : PipeLine.Step
    {
        public event CommandExitedDelegate OnCommandExited;

        public CommandRunner CommandRunner { get; }

        public CommandStep(string stepName, string filename,params string[] arguments)
        :base(stepName)
        {
            CommandRunner = new CommandRunner(filename, arguments);
        }

        public override int Run(CIJob job)
        {
            CommandRunner.WorkingDirectory = job.WorkingDirectory;
            
            int result = CommandRunner.Run(job.Logger, job.GetLogStream(DefaultLogFileName));
            OnCommandExited?.Invoke(this, job, result);
            return result;
        }
    }

}