using Disco.BI.Extensions;
using Disco.Data.Repository;
using Disco.Models.Areas.Config.UI.UserFlag;
using Disco.Models.Repository;
using Disco.Models.Services.Documents;
using Disco.Models.Services.Exporting;
using Disco.Models.UI.Config.DocumentTemplate;
using Disco.Services;
using Disco.Services.Authorization;
using Disco.Services.Documents;
using Disco.Services.Documents.ManagedGroups;
using Disco.Services.Exporting;
using Disco.Services.Plugins.Features.UIExtension;
using Disco.Services.Web;
using Disco.Web.Areas.Config.Models.DocumentTemplate;
using Disco.Web.Models.Shared;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;

namespace Disco.Web.Areas.Config.Controllers
{
    public partial class DocumentTemplateController : AuthorizedDatabaseController
    {
        [DiscoAuthorize(Claims.Config.DocumentTemplate.Show)]
        public virtual ActionResult Index(string id, string bulkGenerateId = null, string bulkGenerateFilename = null)
        {
            if (string.IsNullOrEmpty(id))
            {
                var m = new IndexModel()
                {
                    DocumentTemplates = Database.DocumentTemplates
                        .Select(dt => new
                        {
                            documentTemplate = dt,
                            storedInstances =
                                Database.DeviceAttachments.Count(a => a.DocumentTemplateId == dt.Id) +
                                Database.JobAttachments.Count(a => a.DocumentTemplateId == dt.Id) +
                                Database.UserAttachments.Count(a => a.DocumentTemplateId == dt.Id)
                        })
                        .ToDictionary(i => i.documentTemplate, i => i.storedInstances),
                    Packages = DocumentTemplatePackages.GetPackages()
                };

                // UI Extensions
                UIExtensions.ExecuteExtensions<ConfigDocumentTemplateIndexModel>(this.ControllerContext, m);

                return View(m);
            }
            else
            {
                // Normal Document Template
                var m = new ShowModel()
                {
                    DocumentTemplate = Database.DocumentTemplates.Include("JobSubTypes").FirstOrDefault(at => at.Id == id)
                };
                if (m.DocumentTemplate == null)
                    throw new ArgumentException("Invalid Document Template Id", nameof(id));

                m.TemplatePagesHaveAttachmentId = m.DocumentTemplate.PdfPageHasAttachmentId(Database);
                m.TemplateExpressions = m.DocumentTemplate.ExtractPdfExpressions(Database);
                m.UpdateModel(Database);

                DocumentTemplateDevicesManagedGroup devicesManagedGroup;
                if (DocumentTemplateDevicesManagedGroup.TryGetManagedGroup(m.DocumentTemplate, out devicesManagedGroup))
                    m.DevicesLinkedGroup = devicesManagedGroup;
                DocumentTemplateUsersManagedGroup usersManagedGroup;
                if (DocumentTemplateUsersManagedGroup.TryGetManagedGroup(m.DocumentTemplate, out usersManagedGroup))
                    m.UsersLinkedGroup = usersManagedGroup;

                m.BulkGenerateDownloadId = bulkGenerateId;
                m.BulkGenerateDownloadFilename = bulkGenerateFilename;

                // UI Extensions
                UIExtensions.ExecuteExtensions<ConfigDocumentTemplateShowModel>(this.ControllerContext, m);

                return View(MVC.Config.DocumentTemplate.Views.Show, m);
            }
        }

        public virtual ActionResult ShowPackage(string id)
        {
            // Document Template Package
            var m = new ShowPackageModel()
            {
                Package = DocumentTemplatePackages.GetPackage(id)
            };
            if (m.Package == null)
                throw new ArgumentException("Invalid Document Template Package Id", nameof(id));

            if (m.Package.Scope == AttachmentTypes.Job)
            {
                m.JobTypes = Database.JobTypes.Include("JobSubTypes").ToList();
                m.JobSubTypesSelected = m.Package.GetJobSubTypes(m.JobTypes.SelectMany(jt => jt.JobSubTypes));
            }
            var packageScopeString = m.Package.Scope.ToString();

            m.DocumentTemplates = Database.DocumentTemplates.Where(dt => dt.Scope == packageScopeString).ToList();
            m.DocumentTemplatesSelected = m.Package.GetDocumentTemplates(m.DocumentTemplates);

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateShowPackageModel>(this.ControllerContext, m);

            return View(MVC.Config.DocumentTemplate.Views.ShowPackage, m);
        }

        [DiscoAuthorize(Claims.Config.DocumentTemplate.ShowStatus)]
        public virtual ActionResult ImportStatus()
        {
            var m = new ImportStatusModel();

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateImportStatusModel>(this.ControllerContext, m);

            return View();
        }

        [DiscoAuthorize(Claims.Config.DocumentTemplate.UndetectedPages)]
        public virtual ActionResult UndetectedPages()
        {
            var m = new UndetectedPagesModel()
            {
                DocumentTemplates = Database.DocumentTemplates.ToList()
            };

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateUndetectedPagesModel>(this.ControllerContext, m);

            return View(m);
        }

        [DiscoAuthorizeAll(Claims.Config.DocumentTemplate.Create, Claims.Config.DocumentTemplate.Configure)]
        public virtual ActionResult Create()
        {
            var m = new CreateModel();
            m.UpdateModel(Database);

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateCreateModel>(this.ControllerContext, m);

            return View(m);
        }

        [DiscoAuthorizeAll(Claims.Config.DocumentTemplate.Create, Claims.Config.DocumentTemplate.Configure), HttpPost]
        public virtual ActionResult Create(CreateModel model)
        {
            model.UpdateModel(Database);

            if (ModelState.IsValid)
            {
                // Check for Existing
                var existing = Database.DocumentTemplates.Where(m => m.Id == model.DocumentTemplate.Id).FirstOrDefault();
                if (existing == null)
                {

                    Database.DocumentTemplates.Add(model.DocumentTemplate);

                    if (model.DocumentTemplate.Scope == DocumentTemplate.DocumentTemplateScopes.Job)
                    {
                        model.DocumentTemplate.JobSubTypes = model.GetJobSubTypes();
                    }

                    Database.SaveChanges();

                    // Save Template
                    model.DocumentTemplate.SavePdfTemplate(Database, model.Template.InputStream);

                    return RedirectToAction(MVC.Config.DocumentTemplate.Index(model.DocumentTemplate.Id));
                }
                else
                {
                    ModelState.AddModelError("Id", "A Document Template with this Id already exists.");
                }
            }

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateCreateModel>(this.ControllerContext, model);

            return View(model);
        }

        [DiscoAuthorizeAll(Claims.Config.DocumentTemplate.Create, Claims.Config.DocumentTemplate.Configure)]
        public virtual ActionResult CreatePackage()
        {
            var m = new CreatePackageModel();

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateCreatePackageModel>(this.ControllerContext, m);

            return View(m);
        }

        [DiscoAuthorizeAll(Claims.Config.DocumentTemplate.Create, Claims.Config.DocumentTemplate.Configure), HttpPost]
        public virtual ActionResult CreatePackage(CreatePackageModel model)
        {
            if (ModelState.IsValid)
            {
                // Check for Existing
                var existing = DocumentTemplatePackages.GetPackage(model.Package.Id);
                if (existing == null)
                {
                    DocumentTemplatePackages.CreatePackage(model.Package);

                    return RedirectToAction(MVC.Config.DocumentTemplate.ShowPackage(model.Package.Id));
                }
                else
                {
                    ModelState.AddModelError("Id", "A Document Template Package with this Id already exists.");
                }
            }

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateCreatePackageModel>(this.ControllerContext, model);

            return View(model);
        }

        public static ConfigDocumentTemplateBulkGenerate BuildBulkGenerateModel(DocumentTemplate documentTemplate, DiscoDataContext database, AuthorizationToken authorization)
        {
            var model = new BulkGenerateModel()
            {
                DocumentTemplate = documentTemplate,
            };

            model.TemplatePageCount = model.DocumentTemplate.PdfPageHasAttachmentId(database).Count;
            model.UserFlags = database.UserFlags.Select(f => new ItemWithCount<UserFlag>()
            {
                Item = f,
                Count = f.UserFlagAssignments.Where(a => a.RemovedDate == null).Count(),
            }).ToList();
            model.DeviceProfiles = database.DeviceProfiles.Select(p => new ItemWithCount<DeviceProfile>()
            {
                Item = p,
                Count = p.Devices.Where(d => d.AssignedUserId != null).Count(),
            }).ToList();
            model.DeviceBatches = database.DeviceBatches.Select(p => new ItemWithCount<DeviceBatch>()
            {
                Item = p,
                Count = p.Devices.Where(d => d.AssignedUserId != null).Count(),
            }).ToList();
            model.DocumentTemplates = database.DocumentTemplates.Select(dt => new ItemWithCount<DocumentTemplate>()
            {
                Item = dt,
            }).ToList();
            foreach (var record in model.DocumentTemplates)
            {
                switch (record.Item.AttachmentType)
                {
                    case AttachmentTypes.Device:
                        record.Count = database.DeviceAttachments.Where(a => a.DocumentTemplateId == record.Item.Id).Select(a => a.Device.AssignedUser).Distinct().Count();
                        break;
                    case AttachmentTypes.Job:
                        record.Count = database.JobAttachments.Where(a => a.DocumentTemplateId == record.Item.Id).Select(a => a.Job.User).Distinct().Count();
                        break;
                    case AttachmentTypes.User:
                        record.Count = database.UserAttachments.Where(a => a.DocumentTemplateId == record.Item.Id).Select(a => a.User).Distinct().Count();
                        break;
                    default:
                        throw new NotSupportedException();
                }
            }
            if (authorization.Has(Claims.User.ShowDetails))
            {
                model.UserDetails = database.UserDetails.Where(d => d.Scope == "Details").GroupBy(d => d.Key).Select(g => new ItemWithCount<string>()
                {
                    Item = g.Key,
                    Count = g.Count(),
                }).ToList();
            }
            else
            {
                model.UserDetails = new List<ItemWithCount<string>>();
            }

            return model;
        }

        [DiscoAuthorizeAll(Claims.Config.DocumentTemplate.BulkGenerate, Claims.User.Actions.GenerateDocuments)]
        public virtual ActionResult BulkGenerate(string id)
        {
            var documentTemplate = Database.DocumentTemplates.FirstOrDefault(at => at.Id == id);

            if (documentTemplate == null)
                throw new ArgumentException("Invalid Document Template Id", nameof(id));

            if (documentTemplate.Scope != DocumentTemplate.DocumentTemplateScopes.User)
                throw new NotSupportedException("Only user-scoped document templates can be bulk generated using this method");


            var model = BuildBulkGenerateModel(documentTemplate, Database, Authorization);

            // UI Extensions
            UIExtensions.ExecuteExtensions(ControllerContext, model);

            return View(MVC.Config.DocumentTemplate.Views.BulkGenerate, model);
        }

        [HttpGet]
        [DiscoAuthorize(Claims.Config.DocumentTemplate.Export)]
        public virtual ActionResult Export(string id, Guid? exportId)
        {
            var m = new ExportModel()
            {
                Options = DocumentExportOptions.DefaultOptions(),
                DocumentTemplates = Database.DocumentTemplates.OrderBy(d => d.Id).ToList(),
            };

            m.Fields = ExportFieldsModel.Create(m.Options, nameof(DocumentExportOptions.LatestOnly));

            var userCustomDetailKeys = Database.UserDetails.Where(d => d.Scope == "Details").Select(d => d.Key).Distinct().OrderBy(k => k).ToList();
            if (userCustomDetailKeys.Any())
            {
                var group = new ExportOptionGroup("User Custom Details");
                foreach (var key in userCustomDetailKeys)
                {
                    group.Add(new ExportOptionField()
                    {
                        GroupName = group.Name,
                        Name = key,
                        DisplayName = key.TrimEnd('*', '&'),
                        Description = $"{key} custom detail for the user associated with the document instance",
                        Checked = false,
                        Key = "UserDetailCustom",
                        Value = key,
                    });
                }
                m.Fields.FieldGroups.Add(group);
            }

            if (ExportTask.TryFromCache(exportId, out var context))
            {
                m.ExportId = exportId;
                m.ExportResult = context.Result;
            }

            if (!string.IsNullOrWhiteSpace(id))
            {
                var template = m.DocumentTemplates.FirstOrDefault(d => string.Equals(d.Id, id, StringComparison.OrdinalIgnoreCase));

                if (template != null)
                {
                    m.Options.DocumentTemplateIds.Add(template.Id);
                }
            }

            // UI Extensions
            UIExtensions.ExecuteExtensions<ConfigDocumentTemplateExportModel>(ControllerContext, m);

            return View(m);
        }

        public virtual ActionResult ExpressionBrowser()
        {
            // for backwards compatibility
            return RedirectToAction(MVC.Config.Expressions.Browser());
        }

    }
}