using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Weee.Models;
using Weee.Models.ExtensionMethods;

namespace Weee.Supports
{
    public class CarbonEmissionCalculator
    {
        public static decimal GetMaterialProductionAndTransportPhase(ICollection<Material> materials)
        {
            return CalculateMaterialProductionAndTransportPhase(materials);
        }

        public static decimal GetProductionPhase(ProductLCA productLca)
        {

            //warning , this code is duplicated in ProductLCAInventoryExcelExporter.cs private function "InsertProductCO2DataInManufacturing"
            var snapshot = productLca.SnapShotSurveyResult;
            if (snapshot == null) return 0m;
            var scopeOneData = snapshot.Scope1FabResult * snapshot.constantFactorInWorkHour;
            var scopeTwoData = snapshot.Scope2FabResult * snapshot.constantFactorInWorkHour;
            var scopeThreeData = snapshot.Scope3FabResult * snapshot.constantFactorInWorkHour;
            var primaryData = scopeOneData + scopeThreeData + scopeTwoData;
            var secondaryDataOfManufacturing = (snapshot.SecondaryWasteResult + snapshot.SecondaryWasteTransportResult) * snapshot.constantFactorInWorkHour;
            var lcaResultCO2 = secondaryDataOfManufacturing + primaryData;
            return lcaResultCO2.HasValue ? lcaResultCO2.Value : 0m;
        }

        public static decimal GetDeliveryPhase(ProductLCA productLca)
        {
            return CalculateDeliveryPhase(productLca);
        }

        public static decimal GetAbandonedPhase(InventoryStageData inventoryStageData)
        {
            return CalculateAbandonedPhase(inventoryStageData);
        }

        public static decimal GetSecondDataTypeOfPartsKgCO2e(ICollection<Material> materials)
        {
            //land mine ! this is related to ProductLCAInventoryExcelExporter.InsertCO2Inventory
            return materials.Where(x => x.RequestSent != null)
                            .Where(x => x.RequestSent.AcceptReplyDate != null)
                            .Where(x => x.RequestSent.RepliedByWhichLCA != null)
                            .Sum(x => x.KgCO2e);
        }

        public static decimal GetPrimaryDataTypeOfPartsKgCO2e(ICollection<Material> materials)
        {
            decimal primaryDataTypeOfPartsKgCO2e = 0;

            foreach (var material in materials)
            {
                var requestSent = material.RequestSent;
                var repliedLca = requestSent != null ? requestSent.RepliedByWhichLCA : null;
                if (requestSent == null || repliedLca == null) continue;

                var totalKgCO2e = CalculateTotalKgCO2e(repliedLca);
                var distributeWeight = CalculateDistributeWeight(repliedLca);
                var distributeArea = CalculateDistributeArea(repliedLca);
                var distributeHour = CalculateDistributeHour(repliedLca);

                if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWeight &&
                    distributeWeight != 0)
                {
                    primaryDataTypeOfPartsKgCO2e += totalKgCO2e / distributeWeight;
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byArea &&
                         distributeArea != 0)
                {
                    primaryDataTypeOfPartsKgCO2e += totalKgCO2e / distributeArea;
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWorkHour &&
                         distributeHour != 0)
                {
                    primaryDataTypeOfPartsKgCO2e += totalKgCO2e / distributeHour;
                }
            }

            return primaryDataTypeOfPartsKgCO2e;
        }

        public static decimal GetMaterialScopeOneDistributeKgCO2e(ICollection<Material> materials)
        {
            decimal materialScopeOneDistributeKgCO2e = 0;

            foreach (var material in materials)
            {
                var requestSent = material.RequestSent;
                var repliedLca = requestSent != null ? requestSent.RepliedByWhichLCA : null;

                if (requestSent == null || repliedLca == null || repliedLca.SnapShotSurveyResult == null) continue;

                var scopeOneKgCO2e = repliedLca.SnapShotSurveyResult.Scope1FabResult;

                if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWeight &&
                    CalculateDistributeWeight(repliedLca) != 0)
                {
                    materialScopeOneDistributeKgCO2e += scopeOneKgCO2e / CalculateDistributeWeight(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byArea &&
                         CalculateDistributeArea(repliedLca) != 0)
                {
                    materialScopeOneDistributeKgCO2e += scopeOneKgCO2e / CalculateDistributeArea(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWorkHour &&
                         CalculateDistributeHour(repliedLca) != 0)
                {
                    materialScopeOneDistributeKgCO2e += scopeOneKgCO2e / CalculateDistributeHour(repliedLca);
                }
            }

            return materialScopeOneDistributeKgCO2e;
        }

        public static decimal GetMaterialScopeTwoDistributeKgCO2e(ICollection<Material> materials)
        {
            decimal materialScopeTwoDistributeKgCO2e = 0;

            foreach (var material in materials)
            {
                var requestSent = material.RequestSent;
                var repliedLca = requestSent != null ? requestSent.RepliedByWhichLCA : null;

                if (requestSent == null || repliedLca == null || repliedLca.SnapShotSurveyResult == null) continue;

                var scopeTwoKgCO2e = repliedLca.SnapShotSurveyResult.Scope2FabResult;

                if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWeight &&
                    CalculateDistributeWeight(repliedLca) != 0)
                {
                    materialScopeTwoDistributeKgCO2e += scopeTwoKgCO2e / CalculateDistributeWeight(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byArea &&
                         CalculateDistributeArea(repliedLca) != 0)
                {
                    materialScopeTwoDistributeKgCO2e += scopeTwoKgCO2e / CalculateDistributeArea(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWorkHour &&
                         CalculateDistributeHour(repliedLca) != 0)
                {
                    materialScopeTwoDistributeKgCO2e += scopeTwoKgCO2e / CalculateDistributeHour(repliedLca);
                }
            }

            return materialScopeTwoDistributeKgCO2e;
        }

        public static decimal GetMaterialScopeThreeDistributeKgCO2e(ICollection<Material> materials)
        {
            decimal materialScopeThreeDistributeKgCO2e = 0;

            foreach (var material in materials)
            {
                var requestSent = material.RequestSent;
                var repliedLca = requestSent != null ? requestSent.RepliedByWhichLCA : null;

                if (requestSent == null || repliedLca == null || repliedLca.SnapShotSurveyResult == null) continue;

                var scopeThreeKgCO2e = repliedLca.SnapShotSurveyResult.Scope3FabResult;

                if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWeight &&
                    CalculateDistributeWeight(repliedLca) != 0)
                {
                    materialScopeThreeDistributeKgCO2e += scopeThreeKgCO2e / CalculateDistributeWeight(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byArea &&
                         CalculateDistributeArea(repliedLca) != 0)
                {
                    materialScopeThreeDistributeKgCO2e += scopeThreeKgCO2e / CalculateDistributeArea(repliedLca);
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWorkHour &&
                         CalculateDistributeHour(repliedLca) != 0)
                {
                    materialScopeThreeDistributeKgCO2e += scopeThreeKgCO2e / CalculateDistributeHour(repliedLca);
                }
            }

            return materialScopeThreeDistributeKgCO2e;
        }

        public static decimal GetWasteTransportDistributeByHour(ProductLCA productLca)
        {
            if (productLca == null ||
                productLca.SnapShotSurveyResult == null ||
                productLca.SnapShotSurveyResult.constantFactorInWorkHour == null) return 0;
            return productLca.SnapShotSurveyResult.SecondaryWasteTransportResult * productLca.SnapShotSurveyResult.constantFactorInWorkHour.Value;
        }

        private static decimal CalculateMaterialProductionAndTransportPhase(ICollection<Material> materials)
        {
            decimal materialProductionAndTransportPhase = 0;

            foreach (var material in materials)
            {
                var requestSent = material.RequestSent;
                ProductLCA repliedLca = requestSent != null ? requestSent.RepliedByWhichLCA : new ProductLCA();
                decimal totalKgCO2e = CalculateTotalKgCO2e(repliedLca);

                if (requestSent == null || repliedLca == null)
                {
                    materialProductionAndTransportPhase += material.KgCO2e;
                    continue;
                }

                if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWeight &&
                    CalculateDistributeWeight(repliedLca) != 0)
                {
                    decimal totalKgCO2eDistributeByWeight = totalKgCO2e / CalculateDistributeWeight(repliedLca);
                    materialProductionAndTransportPhase += (totalKgCO2eDistributeByWeight +
                                                            repliedLca.SnapShotSurveyResult.SecondaryDirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryIndirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryWrapMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryTransportResult) * material.Quantity;
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byArea &&
                         CalculateDistributeArea(repliedLca) != 0)
                {
                    decimal totalKgCO2eDistributeByArea = totalKgCO2e / CalculateDistributeArea(repliedLca);
                    materialProductionAndTransportPhase += (totalKgCO2eDistributeByArea +
                                                            repliedLca.SnapShotSurveyResult.SecondaryDirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryIndirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryWrapMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryTransportResult) * material.Quantity;
                }
                else if (requestSent.DivideBy == ProductLCAReplyRequest.DivideByOptions.byWorkHour &&
                         CalculateDistributeHour(repliedLca) != 0)
                {
                    decimal totalKgCO2eDistributeByHour = totalKgCO2e / CalculateDistributeHour(repliedLca);
                    materialProductionAndTransportPhase += (totalKgCO2eDistributeByHour +
                                                            repliedLca.SnapShotSurveyResult.SecondaryDirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryIndirectMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryWrapMaterialResult +
                                                            repliedLca.SnapShotSurveyResult.SecondaryTransportResult) * material.Quantity;
                }
            }

            return materialProductionAndTransportPhase;
        }

        private static decimal CalculateProductionPhase(ProductLCA productLca)
        {
            decimal distributeTotalKgCO2e = 0;
            if (CalculateDistributeWeight(productLca) != 0)
            {
                distributeTotalKgCO2e = CalculateTotalKgCO2e(productLca) / CalculateDistributeWeight(productLca);
            }
            else if (CalculateDistributeArea(productLca) != 0)
            {
                distributeTotalKgCO2e = CalculateTotalKgCO2e(productLca) / CalculateDistributeArea(productLca);
            }
            else if (CalculateDistributeHour(productLca) != 0)
            {
                distributeTotalKgCO2e = CalculateDistributeArea(productLca) / CalculateDistributeHour(productLca);
            }

            return distributeTotalKgCO2e + productLca.Materials.Sum(x => x.KgCO2e);
        }

        private static decimal CalculateDeliveryPhase(ProductLCA productLca)
        {
            return productLca.SnapShotSurveyResult.SecondaryTransportResult;
        }


        private static decimal CalculateAbandonedPhase(InventoryStageData inventoryStageData)
        {
            return inventoryStageData != null ? inventoryStageData.ProductAbandonedStageCarbonFootprint : 0;
        }

        private static decimal CalculateTotalKgCO2e(ProductLCA productLca)
        {
            if (productLca == null || productLca.SnapShotSurveyResult == null) return 0;

            return productLca.SnapShotSurveyResult.Scope1FabResult
                  + productLca.SnapShotSurveyResult.Scope2FabResult
                  + productLca.SnapShotSurveyResult.Scope3FabResult
                  + productLca.SnapShotSurveyResult.SecondaryWasteResult
                  + productLca.SnapShotSurveyResult.SecondaryWasteTransportResult;
        }

        private static decimal CalculateDistributeWeight(ProductLCA productLca)
        {

            if (productLca.SnapShotSurveyResult == null ||
                productLca.SnapShotSurveyResult.constantFactorInWeight == null ||
                productLca.SnapShotSurveyResult.constantFactorInWeight.Value == 0m) return 0;

            return (1m / productLca.SnapShotSurveyResult.constantFactorInWeight.Value);
        }

        private static decimal CalculateDistributeArea(ProductLCA productLca)
        {
            if (productLca.SnapShotSurveyResult == null ||
                productLca.SnapShotSurveyResult.constantFactorInArea == null ||
                productLca.SnapShotSurveyResult.constantFactorInArea.Value == 0m) return 0;

            return (1m / productLca.SnapShotSurveyResult.constantFactorInArea.Value);
        }

        private static decimal CalculateDistributeHour(ProductLCA productLca)
        {
            if (productLca.SnapShotSurveyResult == null ||
                productLca.SnapShotSurveyResult.constantFactorInWorkHour == null ||
                productLca.SnapShotSurveyResult.constantFactorInWorkHour.Value == 0m) return 0;

            return (1m / productLca.SnapShotSurveyResult.constantFactorInWorkHour.Value);
        }
    }
}