using System;

namespace FileInterface.Scheduler
{
    public sealed class SchedulerRuntime : IDisposable
    {
        private readonly CronScheduler _scheduler;
        private readonly FileSystemWatcherManager _watcherManager;
        private readonly WebAdminServer _web;
        private readonly IDisposable _ownedResource;
        private bool _disposed;

        public SchedulerRuntime(ICustomFunctionInvoker invoker, SchedulerOptions options)
            : this(invoker, options, null)
        {
        }

        public SchedulerRuntime(ICustomFunctionInvoker invoker, SchedulerOptions options, IDisposable ownedResource)
        {
            if (invoker == null) throw new ArgumentNullException("invoker");
            if (options == null) options = new SchedulerOptions();

            _ownedResource = ownedResource;
            var cronRepository = new CronJobRepository(options.ConfigFile);
            var watcherRepository = new WatcherJobRepository(options.WatcherConfigFile);
            var log = new JobLog(5000);
            var cronExecutor = new CronJobExecutor(invoker, log);
            var watcherExecutor = new WatcherJobExecutor(invoker, log);
            _scheduler = new CronScheduler(cronRepository, cronExecutor, log);
            _watcherManager = new FileSystemWatcherManager(watcherRepository, watcherExecutor, log);
            _web = new WebAdminServer(cronRepository, _scheduler, watcherRepository, _watcherManager, log, options);
        }

        public void Start()
        {
            _scheduler.Start();
            _watcherManager.Start();
            _web.Start();
        }

        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;
            try { _web.Dispose(); }
            finally
            {
                try { _watcherManager.Dispose(); }
                finally
                {
                    try { _scheduler.Dispose(); }
                    finally { if (_ownedResource != null) _ownedResource.Dispose(); }
                }
            }
        }
    }
}