using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using PartSource.Automation.Services;
using PartSource.Data.Contexts;
using PartSource.Data.Models;
using Ratermania.Automation.Interfaces;
using Ratermania.Shopify;
using Ratermania.Shopify.Resources;
using System.Web;

namespace PartSource.Automation.Jobs
{
    public class UpdateFitment : IAutomationJob
    {
        private readonly ILogger<UpdateFitment> _logger;
        private readonly ShopifyClient _shopifyClient;
        private readonly PartSourceContext _partSourceContext;
        private readonly FitmentContext _fitmentContext;
        private readonly VehicleFitmentService _vehicleFitmentService;

        public UpdateFitment(ILogger<UpdateFitment> logger, PartSourceContext partSourceContext, FitmentContext fitmentContext, ShopifyClient shopifyClient, VehicleFitmentService vehicleFitmentService)
        {
            _logger = logger;
            _partSourceContext = partSourceContext;
            _fitmentContext = fitmentContext;
            _shopifyClient = shopifyClient;
            _vehicleFitmentService = vehicleFitmentService;
        }

        public async Task Run(CancellationToken token, params string[] arguments)
        {

            IList<string> productTypes = await _fitmentContext.ProductTypes
                .Where(p => p.Active)
                .Select(p => HttpUtility.UrlEncode(p.Name))
                .ToListAsync();

            foreach (string productType in productTypes)
            {
                _logger.LogInformation("Processing {productType}", HttpUtility.UrlDecode(productType));

                IEnumerable<Product> products = null;
                try
                {
                    products = await _shopifyClient.Products.Get(new Dictionary<string, object> { { "limit", 250 }, { "product_type", productType } });
                    //products = new List<Product>
                    //{
                    //    await _shopifyClient.Products.GetById(7458071052335)
                    //};
                }

                catch (Exception ex)
                {
                    _logger.LogError("Failed to get products from Shopify", ex);
                    throw;
                }

                while (products != null && products.Any())
                {
                    foreach (Product product in products)
                    {
                        ImportData importData = null;
                        bool isFitment = false;

                        try
                        {
                            IEnumerable<Metafield> metafields = await _shopifyClient.Metafields.Get(new Dictionary<string, object> { { "metafield[owner_id]", product.Id }, { "metafield[owner_resource]", "product" } });
                            importData = new ImportData
                            {
                                LineCode = metafields.FirstOrDefault(m => m.Key == "custom_label_0")?.Value ?? string.Empty,
                                PartNumber = metafields.FirstOrDefault(m => m.Key == "custom_label_1")?.Value ?? string.Empty,
                                VariantSku = product.Variants[0].Sku  // They know we can't do fitment for variants
                            };

                            importData.PartNumber = importData.PartNumber.Replace("-", string.Empty);

                            //If the line code is numeric, it cannot have fitment data associated with it.
                            if (int.TryParse(importData.LineCode, out _))
                            {
                                continue;
                            }

                            // Extract Partsource bullet points if present.
                            string bodyHtml = string.IsNullOrEmpty(product.BodyHtml)
                                ? string.Empty
                                : product.BodyHtml.Substring(0, product.BodyHtml.IndexOf("</ul>") + "</ul>".Length);

                            IList<Vehicle> vehicles = _vehicleFitmentService.GetVehiclesForPart(importData.PartNumber, importData.LineCode);
                            IList<int> vehicleIdFitment = _vehicleFitmentService.GetVehicleIdFitment(vehicles);

                            if (!vehicleIdFitment.Any())
                            {
                                Console.WriteLine($"No fitment data for {importData.LineCode} {importData.PartNumber}");
                                continue;
                            }

                            string vehicleIdString = string.Join(',', vehicleIdFitment.Select(j => $"v{j}"));

                            bodyHtml += $"<div id=\"vehicleIDs\" style=\"display:none;\">{vehicleIdString}</div>";
                            isFitment = true;

                            IList<string> ymmFitment = _vehicleFitmentService.GetYmmFitment(vehicles);
                            if (ymmFitment.Count > 0)
                            {
                                isFitment = true;

                                StringBuilder stringBuilder = new StringBuilder();
                                stringBuilder.AppendLine("<table><tr><th colspan=\"2\">This Part Fits</th></tr>");

                                foreach (string fitment in ymmFitment)
                                {
                                    try
                                    {
                                        string[] parts = fitment.Split(' ', 2);
                                        stringBuilder.AppendLine($"<tr><td>{parts[1]}</td><td>{parts[0].Replace("-", ", ")}</td></tr>");
                                    }

                                    catch (Exception ex)
                                    {
                                        _logger.LogWarning(ex, "YMM fitment for {fitment} was in an invalid format", fitment);
                                    }
                                }

                                stringBuilder.AppendLine("</table>");

                                bodyHtml += $"<div id=\"seoData\">{stringBuilder}</div>";
                            }

                            List<string> tags = new List<string>();

                            for (int j = 0; j < vehicleIdFitment.Count; j += 25)
                            {
                                tags.Add(string.Join('-', vehicleIdFitment.Skip(j).Take(25).Select(j => $"v{j}")));
                            }

                            tags.AddRange(ymmFitment);

                            if (tags.Count > 249)
                            {
                                tags = tags.Take(249).ToList();
                            }

                            string zzzIsFitment = isFitment
                                ? "zzzIsFitment=true"
                                : "zzzIsFitment=false";

                            tags.Add(zzzIsFitment);

                            product.Tags = string.Join(',', tags);
                            product.BodyHtml = bodyHtml;
                            await _shopifyClient.Products.Update(product);

                            importData.IsFitment = isFitment;
                            importData.UpdatedAt = DateTime.Now;
                            importData.UpdateType = "Fitment";
                        }

                        catch (Exception ex)
                        {
                            _logger.LogError($"Failed to updated fitment data for SKU {importData?.VariantSku} - {ex.Message}", ex);
                        }

                    }
                    try
                    {
                        products = await _shopifyClient.Products.GetNext();

                    }

                    catch (Exception ex)
                    {
                        _logger.LogWarning(ex, "Failed to get the next set of products.  Retrying");
                        products = await _shopifyClient.Products.GetPrevious();
                    }
                }
            }
        }
    }
}