using FruitBank.Common.Entities;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Azure;
using Nop.Plugin.Misc.FruitBankPlugin.Areas.Admin.Models;
using Nop.Plugin.Misc.FruitBankPlugin.Domains.DataLayer;
using Nop.Plugin.Misc.FruitBankPlugin.Services;
using Nop.Services.Security;
using Nop.Web.Areas.Admin.Controllers;
using Nop.Web.Framework;
using Nop.Web.Framework.Mvc.Filters;
using System.Text;

namespace Nop.Plugin.Misc.FruitBankPlugin.Areas.Admin.Controllers
{
    [Area(AreaNames.ADMIN)]
    [AuthorizeAdmin]  
    public class ManagementPageController : BaseAdminController
    {
        private readonly IPermissionService _permissionService;
        protected readonly FruitBankDbContext _dbContext;
        protected readonly AICalculationService _aiCalculationService;

        public ManagementPageController(IPermissionService permissionService, FruitBankDbContext fruitBankDbContext, AICalculationService aiCalculationService)
        {
            _permissionService = permissionService;
            _dbContext = fruitBankDbContext;
            _aiCalculationService = aiCalculationService;
        }

        public async Task<IActionResult> Test()
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();
            var testPageModel = new TestPageModel();
            testPageModel.Grids = new List<TestGridModel>();

            var testGridModel2 = new TestGridModel();
            testGridModel2.GridName = "Orders";
            testGridModel2.ViewComponentName = "ShippingDocumentGridComponent";
            testPageModel.Grids.Add(testGridModel2);
            
            var testGridModel = new TestGridModel();
            testGridModel.GridName = "Shipping";
            testGridModel.ViewComponentName = "ShippingGridComponent";
            testPageModel.Grids.Add(testGridModel);

            var testGridModel3 = new TestGridModel();
            testGridModel3.GridName = "Partners";
            testGridModel3.ViewComponentName = "PartnersGridComponent";
            testPageModel.Grids.Add(testGridModel3);

            //testGridModel.ViewComponentLocation = "~/Plugins/Misc.FruitBankPlugin/Areas/Admin/Components/Views/_ShippingGridComponent.cshtml";
            return View("~/Plugins/Misc.FruitBankPlugin/Areas/Admin/Views/Order/Test.cshtml", testPageModel);
        }

        [HttpGet]
        public async Task<IActionResult> GetShippings()
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();
           
            // Mock data for now
            var model = _dbContext.Shippings.GetAll(true).OrderByDescending(s => s.Created).ToList();
            var valami = model;
            //model. = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);
            return Json(model);
        }

        [HttpGet]
        public async Task<IActionResult> GetShippingDocuments()
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();

            // Mock data for now
            var model = await _dbContext.ShippingDocuments.GetAll(true).OrderByDescending(sd => sd.Created).ToListAsync();
            var valami = model;
            //model. = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);
            return Json(model);
        }

        [HttpPost]
        public async Task<IActionResult> ShippingDocumentList(int shippingId)
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();

            // Apply filters to mock data
            var model = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);

            return Json(model);
        }
        
        [HttpGet]
        public async Task<IActionResult> GetPartners()
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();

            // Mock data for now
            var model = await _dbContext.Partners.GetAll().OrderByDescending(p => p.Created).ToListAsync();
            var valami = model;
            //model. = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);
            return Json(model);
        }

        [HttpGet]
        public async Task<IActionResult> GetShippingItemsByShippingDocumentId(int shippingDocumentId)
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();

            // Mock data for now
            var model = await _dbContext.ShippingItems.GetAll(true).Where(sd => sd.ShippingDocumentId == shippingDocumentId).OrderByDescending(sd => sd.Created).ToListAsync();
            var valami = model;
            //model. = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);
            return Json(model);
        }

        [HttpGet]
        public async Task<IActionResult> GetShippingDocumentsByShippingDocumentId(int shippingDocumentId)
        {
            if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                return AccessDeniedView();

            // Mock data for now
            var model = await _dbContext.ShippingDocumentToFiles.GetAll().Where(f => f.ShippingDocumentId == shippingDocumentId).OrderByDescending(sd => sd.Created).ToListAsync();
            var valami = model;
            //model. = await _dbContext.GetShippingDocumentsByShippingIdAsync(shippingId);
            return Json(model);
        }

        [HttpPost]
        [RequestSizeLimit(10485760)] // 10MB
        [RequestFormLimits(MultipartBodyLengthLimit = 10485760)]
        public async Task<IActionResult> UploadFile(UploadModel model)
        {
            var files = model.Files;
            var shippingDocumentId = model.ShippingDocumentId;
            try
            {
                if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                    return Json(new { success = false, errorMessage = "Access denied" });

                if (files == null || files.Count == 0)
                    return Json(new { success = false, errorMessage = "No file selected" });

                foreach (var file in files)
                {
                    // Validate file type (PDF only)
                    if (!file.ContentType.Equals("application/pdf", StringComparison.OrdinalIgnoreCase))
                        return Json(new { success = false, errorMessage = "Only PDF files are allowed" });

                    // Validate file size (max 10MB)
                    if (file.Length > 10 * 1024 * 1024)
                        return Json(new { success = false, errorMessage = "File size must be less than 10MB" });

                    // Create upload directory if it doesn't exist
                    var uploadsPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", "uploads", "shippingDocuments");
                    Directory.CreateDirectory(uploadsPath);

                    // Generate unique filename
                    var fileName = $"{Guid.NewGuid()}_{file.FileName}";
                    var filePath = Path.Combine(uploadsPath, fileName);

                    // Save file
                    using (var stream = new FileStream(filePath, FileMode.Create))
                    {
                        await file.CopyToAsync(stream);
                    }

                    // Extract text with PdfPig
                    var pdfText = new StringBuilder();
                    using (var pdf = UglyToad.PdfPig.PdfDocument.Open(filePath))
                    {
                        foreach (var page in pdf.GetPages())
                        {
                            pdfText.AppendLine(page.Text);
                        }
                    }

                    // Log extracted text for debugging
                    Console.WriteLine("Extracted PDF text:");
                    Console.WriteLine(pdfText.ToString());

                    // Analyze PDF with AI to extract structured data
                    var aiAnalysis = await _aiCalculationService.GetOpenAIPDFAnalyzisFromText(
                        pdfText.ToString(),
                        "Extract the following information from this shipping document and return as JSON: documentDate, recipientName, senderName, invoiceNumber, totalAmount, itemCount, notes. If a field is not found, return null for that field."
                    );

                    // Parse AI response (assuming it returns JSON)
                    var extractedData = ParseShippingDocumentAIResponse(aiAnalysis);

                    //TODO: Save document record to database
                    Console.WriteLine("AI Analysis Result:");
                    Console.WriteLine(extractedData.RecipientName);
                    Console.WriteLine(extractedData.SenderName);
                    Console.WriteLine(extractedData.InvoiceNumber);
                    Console.WriteLine(extractedData.TotalAmount);
                    Console.WriteLine(extractedData.ItemCount);
                    Console.WriteLine(extractedData.Notes);


                    var documentId = 1; // Replace with: savedDocument.Id

                    // Return structured document model
                    var documentModel = new ShippingDocumentModel
                    {
                        Id = documentId,
                        ShippingId = shippingDocumentId,
                        FileName = file.FileName,
                        FilePath = $"/uploads/shippingDocuments/{fileName}",
                        FileSize = (int)(file.Length / 1024),
                        DocumentDate = extractedData.DocumentDate,
                        RecipientName = extractedData.RecipientName,
                        SenderName = extractedData.SenderName,
                        InvoiceNumber = extractedData.InvoiceNumber,
                        TotalAmount = extractedData.TotalAmount,
                        ItemCount = extractedData.ItemCount,
                        Notes = extractedData.Notes,
                        RawAIAnalysis = aiAnalysis // Store the raw AI response for debugging
                    };

                }

                // var savedDocument = await _documentService.InsertDocumentAsync(document);

                // Mock saved document ID


                //return Json(new
                //{
                //    success = true,
                //    document = documentModel
                //});

                return Ok($"Files for Shipping Document ID {shippingDocumentId} were uploaded successfully!");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error uploading file: {ex}");
                //return Json(new { success = false, errorMessage = ex.Message });
                return BadRequest("No files were uploaded.");
            }
        }

        private ExtractedDocumentData ParseShippingDocumentAIResponse(string aiResponse)
        {
            try
            {
                // Try to parse as JSON first
                var data = System.Text.Json.JsonSerializer.Deserialize<ExtractedDocumentData>(
                    aiResponse,
                    new System.Text.Json.JsonSerializerOptions { PropertyNameCaseInsensitive = true }
                );
                return data ?? new ExtractedDocumentData();
            }
            catch
            {
                // If JSON parsing fails, return empty data with the raw response in notes
                return new ExtractedDocumentData
                {
                    Notes = $"AI Analysis (raw): {aiResponse}"
                };
            }
        }

        // Helper class for extracted data
        private class ExtractedDocumentData
        {
            public DateTime? DocumentDate { get; set; }
            public string RecipientName { get; set; }
            public string SenderName { get; set; }
            public string InvoiceNumber { get; set; }
            public decimal? TotalAmount { get; set; }
            public int? ItemCount { get; set; }
            public string Notes { get; set; }
        }

        [HttpPost]
        public async Task<IActionResult> DeleteUploadedFile(string filePath)
        {
            try
            {
                if (!await _permissionService.AuthorizeAsync(StandardPermission.Security.ACCESS_ADMIN_PANEL))
                    return Json(new { success = false, message = "Access denied" });

                if (string.IsNullOrEmpty(filePath))
                    return Json(new { success = false, message = "Invalid file path" });

                // TODO: Delete document record from database first
                // var document = await _documentService.GetDocumentByFilePathAsync(filePath);
                // if (document != null)
                //     await _documentService.DeleteDocumentAsync(document);

                var fullPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", filePath.TrimStart('/'));

                if (System.IO.File.Exists(fullPath))
                {
                    System.IO.File.Delete(fullPath);
                    return Json(new { success = true });
                }

                return Json(new { success = false, message = "File not found" });
            }
            catch (Exception ex)
            {
                return Json(new { success = false, message = ex.Message });
            }
        }

    }

    public class UploadModel
    {
        public int ShippingDocumentId { get; set; }
        public List<IFormFile> Files { get; set; }
    }
}