using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc.Rendering;
using EveryThing.Data;
using EveryThing.Models;
using EveryThing.Models.CodeTable;
using EveryThing.Models.Project;
using EveryThing.Models.Invoice;
using Microsoft.EntityFrameworkCore;

namespace EveryThing.Pages.Projects
{
    [Authorize(Roles = "Administrator,ProjecThingUser")]
    public class CreateEditPartItemModel : PageModel
    {
        private readonly ApplicationDbContext _context;
        private readonly UserManager<IdentityApplicationUser> _userManager;
        private readonly SignInManager<IdentityApplicationUser> _loginManager;
        private readonly RoleManager<IdentityApplicationRole> _roleManager;

        public CreateEditPartItemModel(ApplicationDbContext context, UserManager<IdentityApplicationUser> userManager, SignInManager<IdentityApplicationUser> loginManager, RoleManager<IdentityApplicationRole> roleManager)
        {
            _context = context;
            _userManager = userManager;
            _loginManager = loginManager;
            _roleManager = roleManager;
        }

        public IActionResult OnGet(int idProject, int idProjectPart, bool edit, int? idProjectPartItem, int? idArticleCopyFrom)
        {
            var user = _userManager.GetUserAsync(User).Result;

            IdProject = idProject;
            ViewData["IdProject"] = idProject;
            ViewData["IdItemFk"] = new SelectList(_context.CodeTableItems
                .Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active && x.CodeTableItemType == CodeTableItemType.Product)
                .OrderBy(x => x.Title), "IdItem", "Title");
            ViewData["IdMaterialFk"] = new SelectList(_context.CodeTableItems
                .Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active && x.CodeTableItemType == CodeTableItemType.Material)
                .OrderBy(x => x.Title), "IdItem", "Title");
            ViewData["IdMaterialSupplierFk"] = new SelectList(_context.CodeTablePartners
                .Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active && x.Supplier)
                .OrderBy(x => x.Title), "IdPartner", "Title");
            ViewData["IdCodeTableOperationFk"] = new SelectList(_context.CodeTableOperations
                .OrderBy(x => x.Title), "Id", "Title");

            ViewData["Edit"] = edit;

            if (edit)
            {
                ProjectPartItem = _context.ProjectPartItems
                    .Include(x => x.ProjectPart)
                        .ThenInclude(x => x.Project)
                    .FirstOrDefault(x => x.IdProjectPartItem == idProjectPartItem);

                if (ProjectPartItem == null)
                {
                    return NotFound();
                }

                ProjectPartItemOperations = _context.ProjectPartItemOperations
                    .Include(x => x.Operation)
                    .Where(x => x.IdProjectPartItemFk == ProjectPartItem.IdProjectPartItem)
                    .OrderBy(x => x.Order)
                    .ToList();

                var usedOperationIds = ProjectPartItemOperations.Select(x => x.IdCodeTableOperationFk).ToList();
                ViewData["IdCodeTableOperationFk"] = new SelectList(_context.CodeTableOperations
                    .Where(x => !usedOperationIds.Contains(x.Id))
                    .OrderBy(x => x.Title), "Id", "Title");

                CooperationInvoiceItems = _context.InvoiceItems
                    .Include(x => x.Invoice)
                        .ThenInclude(x => x.Partner)
                    .Where(x => x.IdProjectPartItem == ProjectPartItem.IdProjectPartItem
                                && x.Invoice.Type == Invoice.InvoiceType.Cooperation)
                    .ToList();
            }
            else
            {
                ProjectPartItem = new ProjectPartItem
                {
                    NumberOfSets = 1,
                    IdProjectPartFk = idProjectPart
                };
                ProjectPartItemOperations = new List<ProjectPartItemOperation>();
                CooperationInvoiceItems = new List<InvoiceItem>();
            }

            if (idArticleCopyFrom != null)
            {
                var item = _context.ProjectPartItems
                    .OrderByDescending(x => x.DateModified)
                    .ThenByDescending(x => x.IdProjectPartItem)
                    .FirstOrDefault(x => x.IdItemFk == idArticleCopyFrom && (!edit || x.IdProjectPartFk != ProjectPartItem.IdProjectPartFk));

                if (item != null)
                {
                    ProjectPartItem.IdItemFk = item.IdItemFk;
                    ProjectPartItem.NumberOfItems = item.NumberOfItems;
                    ProjectPartItem.NumberOfSets = item.NumberOfSets;
                    ProjectPartItem.IdMaterialFk = item.IdMaterialFk;
                    ProjectPartItem.MaterialDimensions = item.MaterialDimensions;
                    ProjectPartItem.IdMaterialSupplierFk = item.IdMaterialSupplierFk;
                    ProjectPartItem.MaterialPrice = item.MaterialPrice;
                    ProjectPartItem.WorkPrice = item.WorkPrice;
                    ProjectPartItem.SellingPrice = item.SellingPrice;
                }
            }


            return Page();
        }

        [BindProperty]
        public Models.Project.ProjectPartItem ProjectPartItem { get; set; }

        [BindProperty]
        public int IdProject { get; set; }

        public IList<ProjectPartItemOperation> ProjectPartItemOperations { get; set; }

        public IList<InvoiceItem> CooperationInvoiceItems { get; set; }

        public async Task<IActionResult> OnPostAsync(bool edit)
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }
            ProjectPartItem.DateModified = DateTime.Now;
            var user = _userManager.GetUserAsync(User).Result;
            if (!edit)
            {
                ProjectPartItem.Status = ProjectPartItemStatus.Opened;

                var items = _context.ProjectPartItems
                    .Where(x => x.IdProjectPartFk == ProjectPartItem.IdProjectPartFk).ToList();

                ProjectPartItem.ProjectPartItemNumber = items.Count <= 0 ? 1 : items.Max(x => x.ProjectPartItemNumber) + 1;
                _context.ProjectPartItems.Add(ProjectPartItem);
                await _context.SaveChangesAsync();
            }
            else
            {
                _context.Attach(ProjectPartItem).State = EntityState.Modified;

                try
                {
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!ProjectPartItemExists(ProjectPartItem.IdProjectPartItem))
                    {
                        return NotFound();
                    }

                    throw;
                }
            }

            return RedirectToPage("./Edit", new { id = IdProject });
        }

        private bool ProjectPartItemExists(int id)
        {
            return _context.ProjectPartItems.Any(e => e.IdProjectPartItem == id);
        }

        public IActionResult OnGetCodeTableItems(int type)
        {
            var user = _userManager.GetUserAsync(User).Result;
            var codeTableItemType = (CodeTableItemType)type;

            var items = new SelectList(_context.CodeTableItems
                .Where(x => x.IdCompanyFk == user.IdCompanyFk && x.Active && x.CodeTableItemType == codeTableItemType)
                .OrderBy(x => x.Title), "IdItem", "Title");

            return new JsonResult(new { items = items });
        }

        public IActionResult OnPostProjectPartItemOperation(int idProjectPartItem, int idCodeTableOperation)
        {
            var maxOrder = _context.ProjectPartItemOperations
                .Where(x => x.IdProjectPartItemFk == idProjectPartItem)
                .Select(x => (short?)x.Order)
                .Max() ?? 0;

            var operation = new ProjectPartItemOperation
            {
                IdProjectPartItemFk = idProjectPartItem,
                IdCodeTableOperationFk = idCodeTableOperation,
                Finished = false,
                Order = (short)(maxOrder + 1)
            };

            _context.ProjectPartItemOperations.Add(operation);
            _context.SaveChanges();

            var title = _context.CodeTableOperations
                .Where(x => x.Id == idCodeTableOperation)
                .Select(x => x.Title)
                .FirstOrDefault();

            return new JsonResult(new { successful = true, idProjectPartItemOperation = operation.Id, title });
        }

        public IActionResult OnPostToggleProjectPartItemOperationFinished(int idProjectPartItemOperation)
        {
            var successful = true;
            var error = "";

            var operation = _context.ProjectPartItemOperations
                .FirstOrDefault(x => x.Id == idProjectPartItemOperation);

            if (operation != null)
            {
                operation.Finished = !operation.Finished;
                _context.SaveChanges();
            }
            else
            {
                successful = false;
                error = $"Operation with ID: {idProjectPartItemOperation} not found";
            }

            return new JsonResult(new { successful, error, finished = operation?.Finished });
        }

        public IActionResult OnDeleteProjectPartItemOperation(int idProjectPartItemOperation)
        {
            var successful = true;
            var error = "";

            var operation = _context.ProjectPartItemOperations
                .FirstOrDefault(x => x.Id == idProjectPartItemOperation);

            if (operation != null)
            {
                _context.ProjectPartItemOperations.Remove(operation);
                _context.SaveChanges();
            }
            else
            {
                successful = false;
                error = $"Operation with ID: {idProjectPartItemOperation} not found";
            }

            return new JsonResult(new { successful, error, idProjectPartItemOperation });
        }

        public IActionResult OnPostAddDefaultOperations(int idProjectPartItem)
        {
            var existingOperationIds = _context.ProjectPartItemOperations
                .Where(x => x.IdProjectPartItemFk == idProjectPartItem)
                .Select(x => x.IdCodeTableOperationFk)
                .ToList();

            var defaultOperations = _context.CodeTableOperations
                .Where(x => x.Default && !existingOperationIds.Contains(x.Id))
                .OrderBy(x => x.Title)
                .ToList();

            var added = new List<object>();

            var maxOrder = _context.ProjectPartItemOperations
                .Where(x => x.IdProjectPartItemFk == idProjectPartItem)
                .Select(x => (short?)x.Order)
                .Max() ?? 0;

            foreach (var op in defaultOperations)
            {
                maxOrder++;
                var newOp = new ProjectPartItemOperation
                {
                    IdProjectPartItemFk = idProjectPartItem,
                    IdCodeTableOperationFk = op.Id,
                    Finished = false,
                    Order = maxOrder
                };
                _context.ProjectPartItemOperations.Add(newOp);
                _context.SaveChanges();

                added.Add(new { idProjectPartItemOperation = newOp.Id, idCodeTableOperation = op.Id, title = op.Title });
            }

            return new JsonResult(new { successful = true, operations = added });
        }

        public IActionResult OnPostMoveOperation(int idProjectPartItemOperation, string direction)
        {
            var operation = _context.ProjectPartItemOperations
                .FirstOrDefault(x => x.Id == idProjectPartItemOperation);

            if (operation == null)
                return new JsonResult(new { successful = false, error = "Operation not found" });

            ProjectPartItemOperation neighbor;

            if (direction == "up")
            {
                neighbor = _context.ProjectPartItemOperations
                    .Where(x => x.IdProjectPartItemFk == operation.IdProjectPartItemFk && x.Order < operation.Order)
                    .OrderByDescending(x => x.Order)
                    .FirstOrDefault();
            }
            else
            {
                neighbor = _context.ProjectPartItemOperations
                    .Where(x => x.IdProjectPartItemFk == operation.IdProjectPartItemFk && x.Order > operation.Order)
                    .OrderBy(x => x.Order)
                    .FirstOrDefault();
            }

            if (neighbor == null)
                return new JsonResult(new { successful = true });

            var temp = operation.Order;
            operation.Order = neighbor.Order;
            neighbor.Order = temp;
            _context.SaveChanges();

            return new JsonResult(new { successful = true });
        }
    }
}