using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Mono.TextTemplating;
using Newtonsoft.Json;
using PSTW_CentralSystem.Areas.Inventory.Models;
using PSTW_CentralSystem.DBContext;
using PSTW_CentralSystem.Models;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Reflection;

namespace PSTW_CentralSystem.Controllers.API.Inventory
{
    [ApiController]
    [Route("[controller]")]

    public class InvMainAPI : Controller
    {
        private readonly ILogger<InvMainAPI> _logger;
        private readonly AuthDBContext _authDbContext;

        public InvMainAPI(ILogger<InvMainAPI> logger, AuthDBContext authDbContext)
        {
            _logger = logger;
            _authDbContext = authDbContext;
        }

        public class DepartmentCompany
        {
            public int DepartmentId { get; set; }
            public string? DepartmentName { get; set; }
            public int CompanyId { get; set; }
            public string? CompanyName { get; set; }
        }

        public async Task<List<DepartmentCompany>> GetDepartmentWithCompanyList()
        {
            var departmentList = await _authDbContext.Departments.ToListAsync();
            var companyList = await _authDbContext.Companies.ToListAsync();

            // Create a new list to store departments with their company name
            var departmentWithCompanyList = departmentList.Select(department => new DepartmentCompany
            {
                DepartmentId = department.DepartmentId,
                DepartmentName = department.DepartmentName,
                CompanyId = department.CompanyId,
                CompanyName = companyList.FirstOrDefault(company => company.CompanyId == department.CompanyId)?.CompanyName
            }).ToList();

            // Return the constructed list as JSON
            return departmentWithCompanyList;
        }
        public async Task<DepartmentCompany> GetDepartmentWithCompany(int companyId, int departmentId)
        {
            var departmentList = await _authDbContext.Departments.FirstOrDefaultAsync(d => d.DepartmentId == departmentId );
            var companyList = await _authDbContext.Companies.FirstOrDefaultAsync(c => c.CompanyId == companyId);

            // Create a new list to store departments with their company name
            var departmentWithCompany = new DepartmentCompany
            {
                DepartmentId = departmentList.DepartmentId,
                DepartmentName = departmentList.DepartmentName,
                CompanyId = departmentList.CompanyId,
                CompanyName = companyList?.CompanyName
            };

            // Return the constructed list as JSON
            return departmentWithCompany;
        }

        #region Manufacturer

        [HttpPost("ManufacturerList")]
        public async Task<IActionResult> ManufacturerList()
        {
            var manifacturerList = await _authDbContext.Manufacturers.ToListAsync();
            return Json(manifacturerList);
        }

        [HttpPost("AddManufacturer")]
        public async Task<IActionResult> AddManufacturer([FromBody] ManufacturerModel manufacturer)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            if (manufacturer == null)
            {
                return NotFound("Manufacturer is null");
            }

            try
            {
                _authDbContext.Manufacturers.Add(new ManufacturerModel
                {
                    ManufacturerName = manufacturer.ManufacturerName,
                });
                await _authDbContext.SaveChangesAsync();
                var updatedList = await _authDbContext.Manufacturers.ToListAsync();
                return Json(updatedList);
            }
            catch (Exception ex)
            {
                return BadRequest(ex.Message);
            }
        }

        [HttpDelete("DeleteManufacturer/{id}")]
        public async Task<IActionResult> DeleteManufacturer(int id)
        {
            var manufacturer = await _authDbContext.Manufacturers.FindAsync(id);
            if (manufacturer == null)
            {
                return NotFound(new { success = false, message = "Manufacturer not found" });
            }

            _authDbContext.Manufacturers.Remove(manufacturer);
            await _authDbContext.SaveChangesAsync();

            return Ok(new { success = true, message = "Manufacturer deleted successfully" });
        }

        #endregion Manufacturer

        #region Product

        [HttpPost("ProductList")]
        public async Task<IActionResult> ProductList()
        {
            var productList = await _authDbContext.Products.Include("Manufacturer").ToListAsync();
            return Json(productList);
        }

        [HttpPost("ProductListWithItem")]
        public async Task<IActionResult> ProductListWithItem()
        {
            var productList = await _authDbContext.Products
                .Include(p => p.Items) // Include related items
                .Include(p => p.Manufacturer) // Include related manufacturer
                .ToListAsync();

            return Json(productList);
        }


        [HttpPost("AddProduct")]
        public async Task<IActionResult> AddProduct([FromBody] ProductModel product)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            if (product == null)
            {
                return NotFound("Product is null");
            }

            try
            {
                product.QuantityProduct = 0;
                var productImage = product.ImageProduct; // Save image to wwwroot/media/inventory/images | Images name is product.ModelNo | product.ImageProduct is in base64 string
                if (!string.IsNullOrEmpty(product.ImageProduct))
                {
                    var bytes = Convert.FromBase64String(product.ImageProduct);
                    var filePath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/media/inventory/images", product.ModelNo + ".jpg");
                    await System.IO.File.WriteAllBytesAsync(filePath, bytes);
                    product.ImageProduct = "/media/inventory/images/" + product.ModelNo + ".jpg";
                }
                _authDbContext.Products.Add(product);
                await _authDbContext.SaveChangesAsync();
                var updatedList = await _authDbContext.Products.Include("Manufacturer").Where(x => x.ManufacturerId == x.ManufacturerId).ToListAsync();
                return Json(updatedList);
            }
            catch (Exception ex)
            {
                return BadRequest(ex.Message);
            }
        }

        [HttpDelete("DeleteProduct/{id}")]
        public async Task<IActionResult> DeleteProduct(int id)
        {
            var Product = await _authDbContext.Products.FindAsync(id);
            if (Product == null)
            {
                return NotFound(new { success = false, message = "Product not found" });
            }

            _authDbContext.Products.Remove(Product);
            await _authDbContext.SaveChangesAsync();

            return Ok(new { success = true, message = "Product deleted successfully" });
        }

        #endregion Product

        #region Company

        [HttpPost("CompanyDepartmentList")]
        public async Task<IActionResult> CompanyDepartmentList()
        {
            var companyList = await _authDbContext.Companies
                .Include(c => c.Departments)
                .Select(c => new { c.CompanyId, c.CompanyName, Departments = c.Departments
                    .OrderBy(d => d.DepartmentId)
                    .Select(d => new { d.DepartmentId, d.DepartmentName }) 
                })
                .ToListAsync();
            return Json(companyList);
        }

        #endregion Company

        #region Department

        [HttpPost("DepartmentCompanyList")]
        public async Task<IActionResult> DepartmentCompanyList()
        {
            var itemDepartment = await _authDbContext.Departments
            .Include(d => d.Company) // Include the related Company entity
            .Select(d => new
            {
                d.DepartmentId,
                d.DepartmentName,
                d.CompanyId,
                d.Company.CompanyName,
            })
            .ToListAsync();

            //return Json(await GetDepartmentWithCompanyList());
            return Json(itemDepartment);
        }

        #endregion Department

        #region Supplier

        [HttpPost("SupplierList")]
        public async Task<IActionResult> SupplierList()
        {
            var supplierList = await _authDbContext.Suppliers.ToListAsync();
            return Json(supplierList);
        }

        #endregion Supplier

        #region Item

        [HttpPost("ItemList")]
        public async Task<IActionResult> ItemList()
        {
            var itemList = await _authDbContext.Items.ToListAsync();
            return Json(itemList);
        }

        [HttpPost("AddItem")]
        public async Task<IActionResult> AddItem([FromBody] ItemModel item)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            if (item == null)
            {
                return NotFound("Item is null");
            }

            try
            {
                var companyDepartment = await GetDepartmentWithCompany(item.CompanyId, item.DepartmentId);
                var itemProduct = _authDbContext.Products.Where(p => p.ProductId == item.ProductId).FirstOrDefault();
                string? companyInitial = companyDepartment?.CompanyName?.ToString().Substring(0, 1).ToUpper();
                string? depatmentInitial = companyDepartment?.DepartmentName?.ToString().Substring(0, 1).ToUpper();
                char? initialCategory = itemProduct?.Category.ToString().Substring(0, 1).ToUpper().FirstOrDefault();
                string? productId = itemProduct?.ProductId.ToString("D3");
                string? itemId = item?.ItemID+1.ToString("D5");
                var uniqueId = companyInitial+depatmentInitial+initialCategory+productId+itemId?.ToUpper();
                _authDbContext.Items.Add(item);
                await _authDbContext.SaveChangesAsync();
                var updatedItem = await _authDbContext.Items.Select(i => new
                {
                    i.ItemID,
                    i.UniqueID,
                    i.CompanyId,
                    i.DepartmentId,
                    i.ProductId,
                    i.SerialNumber,
                    i.Quantity,
                    i.Supplier,
                    i.PurchaseDate,
                    i.PONo,
                    i.Currency,
                    i.PriceInRM,
                    i.CurrencyRate,
                    i.ConvertPrice,
                    i.DODate,
                    i.Warranty,
                    i.EndWDate,
                    i.InvoiceDate,
                }).FirstOrDefaultAsync(i => i.ItemID == item.ItemID);

                updatedItem.UniqueID = uniqueId;
                _authDbContext.Items.Add(item);
                await _authDbContext.SaveChangesAsync();
                return Json(updatedItem);
            }
            catch (Exception ex)
            {
                return BadRequest(ex.Message);
            }
        }

        [HttpDelete("DeleteItem/{id}")]
        public async Task<IActionResult> DeleteItem(int id)
        {
            var item = await _authDbContext.Items.FindAsync(id);
            if (item == null)
            {
                return NotFound(new { success = false, message = "Item not found" });
            }

            _authDbContext.Items.Remove(item);
            await _authDbContext.SaveChangesAsync();

            return Ok(new { success = true, message = "Item deleted successfully" });
        }

        #endregion Item
    }
}