using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using XF.Material.Forms.UI.Dialogs;
using IDigitalFormInstance = InABox.Core.IDigitalFormInstance;

namespace PRS.Mobile
{

    public class DigitalFormHostModel<TEntity, TEntityLink, TInstance> : IDigitalFormHostModel
        where TEntity : Entity, IRemotable, IPersistent, new()
        where TEntityLink : EntityLink<TEntity>, new()
        where TInstance : Entity, IRemotable, IPersistent, IDigitalFormInstance<TEntityLink>, new()
    {
        public IDigitalFormDataModel DigitalFormDataModel { get; set; }
        public DFLayout DFLayout { get; set; }
        public DigitalFormLayout DigitalFormLayout { get; set; }
        public Entity Entity { get; set; }
        public bool ReadOnly { get; set; }
        public bool NewForm { get; set; }

        public event OnDigitalFormHostModelSaved OnDigitalFormHostModelSaved;
        public event OnDigitalFormHostModelBeforeSave OnDigitalFormHostModelBeforeSave;

        public DigitalFormHostModel()
        {
            DFLayout = new DFLayout();
            NewForm = true;
            ReadOnly = false;
        }

        public void LoadItems(Entity parent, Entity form, DigitalFormLayout layout = null)
        {
            List<DigitalFormVariable> variables = new List<DigitalFormVariable>();
            
            var loadLayout = Task.Run(() =>
            {
                if (layout == null)
                    DigitalFormLayout = QueryDigitalFormLayout(form);
                else
                    DigitalFormLayout = layout;
            });
            
            var getVariables = Task.Run(() =>
            {
                variables = QueryVariables(form);
            });
            
            var loadDFDataModel = Task.Run(() =>
            {
                DigitalFormDataModel = new DigitalFormDataModel<TEntity, TEntityLink, TInstance>(parent.ID, form.ID);
                DigitalFormDataModel.Load(null);
                Entity = DigitalFormDataModel.Entity;
            });
            
            Task.WaitAll(loadLayout, getVariables, loadDFDataModel);
            
            DFLayout.LoadLayout(DigitalFormLayout.Layout);
            
            DFLayout.LoadVariables(variables);
            
            DigitalFormDataModel.Instance.Form.ID = DigitalFormLayout.Form.ID;
            
            DigitalFormDataModel.Variables = variables.ToArray();
            
            if (!string.IsNullOrWhiteSpace(DigitalFormDataModel.Instance.FormData))
                NewForm = false;

            if (DigitalFormDataModel.Instance.FormCompleted != DateTime.MinValue)
                ReadOnly = true;

            DigitalFormDataModel.BeforeModelSaved += (m) =>
            {
                OnDigitalFormHostModelBeforeSave?.Invoke();
                DigitalFormDataModel.Entity = Entity;
                CheckEntity(SaveType.BeforeSave);
            };

            DigitalFormDataModel.OnModelSaved += async (m) =>
            {
                var userResponseRequest = CheckEntity(SaveType.AfterSave);
                var response = await OnDigitalFormHostModelSaved?.Invoke(userResponseRequest);
                if (response == DigitalFormHostUserResponse.Yes)
                    DoResponseActions(userResponseRequest);
            };
        }

        private IDigitalFormInstance GetInstance(Guid iD)
        {
            return new Client<TInstance>().Query(
                new Filter<TInstance>(x => x.ID).IsEqualTo(iD)
            ).Rows.FirstOrDefault().ToObject<TInstance>();
        }

        public DigitalFormLayout QueryDigitalFormLayout(Entity form)
        {
            CoreTable layouts = QueryTableDigitalFormLayout(form);
            while (layouts == null)
                layouts = QueryTableDigitalFormLayout(form);

            DigitalFormLayout layout = layouts.Rows.FirstOrDefault(r => r.Get<DigitalFormLayout, DFLayoutType>(c => c.Type) == DFLayoutType.Mobile)?.ToObject<DigitalFormLayout>();
            while (layout == null)
                layout = layouts.Rows.FirstOrDefault()?.ToObject<DigitalFormLayout>();
            return layout;
        }

        private CoreTable QueryTableDigitalFormLayout(Entity form)
        {
            try
            {
                return new Client<DigitalFormLayout>().Query
                    (
                new Filter<DigitalFormLayout>(x => x.Form.ID)
                    .IsEqualTo(CoreUtils.GetPropertyValue(form,"Form.ID") ?? Guid.Empty) //(form as EntityForm<TEntity, TEntityLink>).Form.ID)
                    //.And(x => x.Type).IsEqualTo(DFLayoutType.Mobile)
                    .And(x => x.Active).IsEqualTo(true),
                new Columns<DigitalFormLayout>(x => x.ID)
                    .Add(x => x.Form.ID)
                    .Add(x => x.Form.AppliesTo)
                    .Add(x => x.Layout)
                    .Add(x => x.Type)
                    );
            }
            catch (Exception ex)
            {
                InABox.Mobile.MobileLogging.Log(ex);
                return null;
            }
        }

        public List<DigitalFormVariable> QueryVariables(Entity form)
        {
            List<DigitalFormVariable> variables = new List<DigitalFormVariable>();

            var table = QueryVariablesTable(form);
            while (table == null)
                table = QueryVariablesTable(form);

            foreach (CoreRow coreRow in table.Rows)
                variables.Add(CreateVariable(coreRow));

            return variables;
        }

        private CoreTable QueryVariablesTable(Entity form)
        {
            try
            {
                return new Client<DigitalFormVariable>().Query(
                        new Filter<DigitalFormVariable>(x => x.Form.ID)
                            .IsEqualTo(CoreUtils.GetPropertyValue(form,"Form.ID") ?? Guid.Empty), //(form as EntityForm<TEntity, TEntityLink>).Form.ID),
                        new Columns<DigitalFormVariable>(x => x.Code)
                            .Add(x => x.Parameters)
                            .Add(x => x.Description)
                            .Add(x => x.VariableType),
                        null
                        );
            }
            catch (Exception ex)
            {
                InABox.Mobile.MobileLogging.Log(ex);
                return null;
            }
        }

        public List<DigitalFormVariable> QueryVariables(DigitalFormLayout layout)
        {
            List<DigitalFormVariable> variables = new List<DigitalFormVariable>();

            var table = new Client<DigitalFormVariable>().Query(
                    new Filter<DigitalFormVariable>(x => x.Form.ID).IsEqualTo(layout.Form.ID),
                    new Columns<DigitalFormVariable>(x => x.Code, x => x.Parameters, x => x.Description, x => x.VariableType),
                    null
                    );
            foreach (CoreRow coreRow in table.Rows)
                variables.Add(CreateVariable(coreRow));

            return variables;
        }

        private DigitalFormVariable CreateVariable(CoreRow row)
        {
            DigitalFormVariable v = new DigitalFormVariable();
            v.Code = row.Get<DigitalFormVariable, string>(x => x.Code);
            v.Parameters = row.Get<DigitalFormVariable, string>(x => x.Parameters);
            v.Description = row.Get<DigitalFormVariable, string>(x => x.Description);
            v.VariableType = row.Get<DigitalFormVariable, string>(x => x.VariableType);
            return v;
        }

        // public void SetPropertyValues(QAFormViewer viewer) //currently does not include Employee Forms
        // {
        //     try
        //     {
        //         if (DigitalFormLayout.Form.AppliesTo.Equals("Kanban"))
        //         {
        //             foreach (KeyValuePair<string, string> pair in viewer.EntityResults)
        //             {
        //                 if (pair.Key.Contains("ID"))
        //                 {
        //                     //this only sets the entity lookup.ID, not the description or code - is this an issue??
        //                     CoreUtils.SetPropertyValue(Entity, pair.Key, Guid.Parse(pair.Value));
        //                 }
        //                 else if (DateTime.TryParse(pair.Value, out DateTime datetime))
        //                 {
        //                     string parsedDate = "";
        //                     parsedDate = datetime.ToString("yyyy-mm-dd hh:mm:ss.zzz"); ;
        //                     CoreUtils.SetPropertyValue(Entity, pair.Key, parsedDate);
        //                 }
        //                 else
        //                 {
        //                     CoreUtils.SetPropertyValue(Entity, pair.Key, pair.Value);
        //                 }
        //
        //             }
        //         }
        //         else if (DigitalFormLayout.Form.AppliesTo.Equals("LeaveRequest"))
        //         {
        //             foreach (KeyValuePair<string, string> pair in viewer.EntityResults)
        //             {
        //                 if (pair.Key.Contains("ID"))
        //                 {
        //                     CoreUtils.SetPropertyValue(Entity, pair.Key, Guid.Parse(pair.Value));
        //                 }
        //                 else if (pair.Key.Equals("From"))
        //                 {
        //                     (Entity as LeaveRequest).From = DateTime.Parse(pair.Value);
        //                 }
        //                 else if (pair.Key.Equals("To"))
        //                 {
        //                     (Entity as LeaveRequest).To = DateTime.Parse(pair.Value);
        //                 }
        //                 else if (pair.Key.Equals("FromTime"))
        //                 {
        //                     (Entity as LeaveRequest).FromTime = TimeSpan.Parse(pair.Value);
        //                 }
        //                 else if (pair.Key.Equals("ToTime"))
        //                 {
        //                     (Entity as LeaveRequest).ToTime = TimeSpan.Parse(pair.Value);
        //                     if ((Entity as LeaveRequest).ToTime == new TimeSpan(0))
        //                     {
        //                         (Entity as LeaveRequest).ToTime = new TimeSpan(23, 59, 59);
        //                     }
        //                 }
        //                 else if (pair.Key.Equals("Notes"))
        //                 {
        //                     (Entity as LeaveRequest).Notes = (Entity as LeaveRequest).Notes + System.Environment.NewLine + pair.Value;
        //                 }
        //                 else
        //                 {
        //                     CoreUtils.SetPropertyValue(Entity, pair.Key, pair.Value);
        //                 }
        //             }
        //         }
        //     }
        //     catch (Exception e)
        //     {
        //         viewer.errors.Add(e.Message);
        //     }
        // }

        private void DoResponseActions(DigitalFormHostResponseRequest userResponseRequest)
        {
            if (userResponseRequest == DigitalFormHostResponseRequest.CloseKanban)
            {
                var kanban = Entity as Kanban;
                kanban.Category = "Complete";
                Task.Run(() => { new Client<Kanban>().Save(kanban, "Completed after completing all forms for task"); });
            }
        }

        private DigitalFormHostResponseRequest CheckEntity(SaveType saveType)
        {
            if (Entity.GetType() == typeof(Kanban))
                return DoKanbanActions(saveType);
            else if (Entity.GetType() == typeof(LeaveRequest))
                (Entity as LeaveRequest).EmployeeLink.ID = App.Data.Me.ID;
            return DigitalFormHostResponseRequest.None;
        }

        private DigitalFormHostResponseRequest DoKanbanActions(SaveType saveType)
        {
            if (saveType == SaveType.BeforeSave)
                CheckAndCreateKanban();
            else if (saveType == SaveType.AfterSave)
            {
                CheckSubscriber();
                return CheckKanbanForms();
            }
            return DigitalFormHostResponseRequest.None;
        }

        private DigitalFormHostResponseRequest CheckKanbanForms()
        {
            if (Entity.ID != Guid.Empty)
            {
                CoreTable table = new Client<KanbanForm>().Query(new Filter<KanbanForm>(x => x.Parent.ID).IsEqualTo(Entity.ID),
                        new Columns<KanbanForm>(x => x.FormCompleted));
                if (table.Rows.Any())
                {
                    List<DateTime> dates = new List<DateTime>();
                    foreach (CoreRow row in table.Rows)
                    {
                        dates.Add(row.Get<KanbanForm, DateTime>(x => x.FormCompleted));
                    }
                    var incompletedates = dates.Where(x => x.Equals(DateTime.MinValue));
                    if (!incompletedates.Any())
                    {
                        return DigitalFormHostResponseRequest.CloseKanban;
                    }
                }
            }
            return DigitalFormHostResponseRequest.None;
        }

        private void CheckAndCreateKanban()
        {
            if (Entity.ID == Guid.Empty)
            {
                Kanban kanban = Entity as Kanban;
                kanban.EmployeeLink.ID = App.Data.Me.ID;
                kanban.DueDate = DateTime.Today;
                kanban.Title = "Form - " + DigitalFormLayout.Form.Description;
                kanban.Notes = new string[] { "Created by Forms App" };
                kanban.Category = "In Progress";

                Entity = kanban;
            }
        }

        private void CheckSubscriber()
        {
            var sub = new Client<KanbanSubscriber>().Query(
                new Filter<KanbanSubscriber>(x => x.Kanban.ID).IsEqualTo(Entity.ID),
                new Columns<KanbanSubscriber>(x => x.ID)
                );
            if (sub.Rows.Count == 0)
                AddSubscriber();
        }

        private void AddSubscriber()
        {
            KanbanSubscriber subscriber = new KanbanSubscriber();
            subscriber.Kanban.ID = Entity.ID;
            subscriber.Assignee = true;
            subscriber.Employee.ID = App.Data.Me.ID;
            new Client<KanbanSubscriber>().Save(subscriber, "Updated From Mobile Device");
        }

        enum SaveType
        {
            BeforeSave,
            AfterSave,
        }
    }
}