using Newtonsoft.Json;
using System.Linq;
using System.Diagnostics;
using System.Text.RegularExpressions;
using ttrss_co_client.tasks;

namespace ttrss_co_client
{
    class Program
    {
        private static ttrss.ApiClient ttrssClient;
        static async Task Main(string[] args)
        {
            var conf = Configure();
            Console.WriteLine($"{DateTime.Now.ToString("o")}");

            ttrssClient = new ttrss.ApiClient(conf.BaseURI);
            await ttrssClient.Login(conf.Username, conf.Password);

            var loggedin = await ttrssClient.IsLoggedIn();
            Console.WriteLine($"logged in: {loggedin}");

            #region phase 1
            Console.WriteLine("===== phase 1 =====");

            var Phase1Tasks = new List<Task<WorkOrder>>();

            Phase1Task.TtrssClient = ttrssClient;
            Phase1Task.Conf = conf;
            var phase1TaskTypes = AppDomain.CurrentDomain.GetAssemblies()
                .SelectMany(domainAssembly => domainAssembly.GetTypes())
                .Where(type => type.IsSubclassOf(typeof(Phase1Task)) && !type.IsAbstract)
                .ToList();
            var phase1TaskConcretions = new List<Phase1Task>();
            foreach (var phase1TaskType in phase1TaskTypes)
            {
                var concretion = (Phase1Task)Activator.CreateInstance(phase1TaskType);
                concretion.TriggerLabel = conf.feedActions.FirstOrDefault(fa => fa.command == concretion.TaskName).triggerlabelCaption;
                phase1TaskConcretions.Add(concretion);
            }
            Console.WriteLine($"{phase1TaskConcretions.Count()} phase 1 task types understood");

            var unreadFeeds = await ttrssClient.GetFeeds(cat_id: -3, unread_only: true);
            Console.WriteLine($"{unreadFeeds.Count()} feeds unread");
            foreach (var uf in unreadFeeds)
            {
                Console.WriteLine($"unread feed: {uf.title}");
                var headlines = await ttrssClient.GetHeadlines(uf.id, view_mode: ttrss.ApiClient.VIEWMODE.Unread, include_attachments: true);
                foreach (var hl in headlines)
                {
                    var labelsWRTArticle = (await ttrssClient.GetLabels(hl.id));
                    var actionsForFeed = conf.feedActions.Where(fa =>
                        labelsWRTArticle.Where(l => l.@checked).Select(l => l.caption).Contains(fa.triggerlabelCaption))?.ToList();
                    if (actionsForFeed != null && actionsForFeed.Any())
                    {
                        var action = actionsForFeed.First();

                        Console.WriteLine($"    headline {hl.title} has label {action.triggerlabelCaption} / action {action.command}");

                        var appropriatePhase1Task = phase1TaskConcretions.FirstOrDefault(tt => tt.TaskName == action.command);
                        if (appropriatePhase1Task != null)
                        {
                            Phase1Tasks.Add(appropriatePhase1Task.ActOn(hl, labelsWRTArticle));
                        }
                        else
                        {
                            Console.Error.WriteLine($"couldn't find phase 1 task {action.command} for workorder referring to article id {hl.id}!");
                        }
                    }
                }
            }
            Console.WriteLine($"done processing feeds. phase 1 tasks launched. wait to complete.");
            var remainingWork = new List<WorkOrder>();
            foreach (var lingeringTask in Phase1Tasks)
            {
                var wo = await lingeringTask;
                if (wo != null)
                {
                    Console.WriteLine($"articleId {wo.articleId} left a work order; it has {wo.Phase2TaskList.Count()} phase 2 task{(wo.Phase2TaskList.Count() == 1 ? "" : "s")}");
                    remainingWork.Add(wo);
                }
            }
            Console.WriteLine($"phase 1 tasks complete, carrying {remainingWork.Count()} workorder{(remainingWork.Count() == 1 ? "" : "s")} to phase 2");
            #endregion

            #region local tasks (stripping ads, converting.)
            Console.WriteLine("===== phase 2 =====");
            //loop through working directory looking for other work orders to add
            var workOrderFiles = Directory.GetFiles($"{conf.WorkingDirectory}", "workorder.json", new EnumerationOptions() { RecurseSubdirectories = true });
            Console.WriteLine($"{workOrderFiles.Count()} workorder file{(workOrderFiles.Count() == 1 ? "" : "s")} located");
            foreach (var workorderFile in workOrderFiles)
            {
                try
                {
                    remainingWork.Add(JsonConvert.DeserializeObject<WorkOrder>(File.ReadAllText(workorderFile)));
                    Console.WriteLine($"picked up workorder task; {workorderFile}");
                    File.Delete(workorderFile);
                }
                catch (Exception e)
                {
                    Console.Error.WriteLine($"error picking up work order file {workorderFile} - {e.Message}; {e.StackTrace}");
                }
            }
            Console.WriteLine($"{remainingWork.Count} phase 2 workorders, between pulled from ttrss and read from files");

            Phase2Task.TtrssClient = ttrssClient;
            Phase2Task.Conf = conf;
            var phase2TaskTypes = AppDomain.CurrentDomain.GetAssemblies()
                .SelectMany(domainAssembly => domainAssembly.GetTypes())
                .Where(type => type.IsSubclassOf(typeof(Phase2Task)) && !type.IsAbstract)
                .ToList();
            var phase2TaskConcretions = new List<Phase2Task>();
            foreach (var phase2TaskType in phase2TaskTypes)
            {
                var concretion = (Phase2Task)Activator.CreateInstance(phase2TaskType);
                phase2TaskConcretions.Add(concretion);
            }

            ChatMessage.ChatScript = conf.ChatScript;

            while (remainingWork.Count > 0)
            {
                //todo: solve the halting problem
                //ok but seriously, maybe I could time out work orders after a while? but converting a 3-hour 4k video could easily take an hour!
                Console.WriteLine($"{phase2TaskConcretions.Count()} phase 2 task types understood");

                var Phase2Tasks = new List<Task<Tuple<Phase2Task.TaskStatus, WorkOrder>>>();


                Console.WriteLine($"launching first pass over work orders in phase 2.");
                foreach (var wo in remainingWork)
                {
                    var taskName = wo.Phase2TaskList[wo.Phase2TaskList.Keys.Min()];

                    var appropriatePhase2Task = phase2TaskConcretions.FirstOrDefault(tt => tt.TaskName == taskName);
                    if (appropriatePhase2Task != null)
                    {
                        wo.Phase2TaskList.Remove(wo.Phase2TaskList.Keys.Min());
                        Console.WriteLine("launching phase 2 task: " + taskName);
                        Phase2Tasks.Add(appropriatePhase2Task.ActOn(wo));
                    }
                    else
                    {
                        Console.Error.WriteLine($"couldn't find phase 2 task {taskName} for workorder referring to article id {wo.articleId}!");
                    }
                }

                Console.WriteLine($"phase 2 tasks launched. now the complex part.");

                remainingWork = new List<WorkOrder>();
                foreach (var lingeringTask in Phase2Tasks)
                {
                    var wo = await lingeringTask;
                    var wop = Path.Combine(conf.WorkingDirectory, wo.Item2.guid.ToString(), "workorder.json");
                    File.WriteAllText(wop, JsonConvert.SerializeObject(wo.Item2));
                    //if you tell me it's done, or you need to continue now.... I believe you.
                    switch (wo.Item1)
                    {
                        case Phase2Task.TaskStatus.Done:
                            File.Delete(wop);
                            Directory.Delete(Path.Combine(conf.WorkingDirectory, wo.Item2.guid.ToString()));
                            break;
                        case Phase2Task.TaskStatus.ContinueNow:
                            remainingWork.Add(wo.Item2);
                            break;
                        case Phase2Task.TaskStatus.TryLater:
                            break;
                    }
                }
                Console.WriteLine($"{remainingWork.Count} phase 2 tasks to be re-looped.");
            }
            #endregion
            await ttrssClient.Logout();
            Console.WriteLine($"logged out of ttrss.");

            Console.WriteLine($"done for real");
        }
        static Configuration Configure(string configurationPath = "appsettings.json")
        {
            if (!File.Exists(configurationPath))
            {
                Console.Error.WriteLine($"could not find configuration at {configurationPath}! copying sample to that spot.");
                File.Copy("sample-appsettings.json", configurationPath); //and you know what, if that explodes at the OS level, the OS should give you an error
                return null;
            }
            var fileContents = File.ReadAllText(configurationPath);
            if (string.IsNullOrWhiteSpace(fileContents))
            {
                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
                File.Copy("sample-appsettings.json", configurationPath, true);
                return null;
            }

            var conf = JsonConvert.DeserializeObject<Configuration>(fileContents);

            if (conf == null)
            {
                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
                File.Copy("sample-appsettings.json", configurationPath, true);
                return null;
            }

            return conf;
        }
    }
}