using COA.Common;
using COA.EnterpriseServices.DataAccess.Entities;
using COA.PartnerApis.QuickBase;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;

namespace COA.EnterpriseServices.DataAccess.QuickBase
{
    internal static class FieldMapRegistry
    {
        private static readonly ICollection<FieldMap> fieldRegistry = new List<FieldMap>();
        private static readonly IDictionary<Type, string> tableRegistry = new Dictionary<Type, string>();

        static FieldMapRegistry()
        {
            AddTable<Creditor, CreditorsFieldMap>()
                .WithDefaults()
                .WithProperty(c => c.Status, CreditorsFieldMap.CreditorStatus)
                .WithProperty(c => c.ClientFirstName, CreditorsFieldMap.ClientFirstName)
                .WithProperty(c => c.ClientLastName, CreditorsFieldMap.ClientLastName)
                .WithProperty(c => c.CurrentCreditorProfileId, CreditorsFieldMap.RelatedCurrentCreditorPrimary)
                .WithProperty(c => c.OriginalCreditorProfileId, CreditorsFieldMap.RelatedOriginalCreditor)
                .WithProperty(c => c.AccountNumber, CreditorsFieldMap.AccountNum);

            AddTable<Entities.Client, ClientFieldMap>()
                .WithDefaults()
                .WithProperty(c => c.FirstName, ClientFieldMap.FirstName)
                .WithProperty(c => c.LastName, ClientFieldMap.LastName)
                .WithProperty(c => c.Email, ClientFieldMap.ClientPrimaryEmail)
                .WithProperty(c => c.Phone, ClientFieldMap.ClientPrimaryPhone);
        }

        /// <summary>
        /// Adds a table mapping for a QuickBase field map
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <typeparam name="TEnumFieldMap"></typeparam>
        /// <returns></returns>
        private static TableMap<TEntity, TEnumFieldMap> AddTable<TEntity, TEnumFieldMap>() where TEntity : IRecord
        {
            var tableNameAttribute = typeof(TEnumFieldMap).GetCustomAttribute<QuickBaseNameAttribute>();

            if (tableNameAttribute != null)
            {
                tableRegistry.Add(typeof(TEntity), tableNameAttribute.Name);
            }

            return default;
        }

        /// <summary>
        /// Adds default property mappings for common fields
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <typeparam name="TEnumFieldMap"></typeparam>
        /// <param name="table"></param>
        /// <returns></returns>
        internal static TableMap<TEntity, TEnumFieldMap> WithDefaults<TEntity, TEnumFieldMap>(this TableMap<TEntity, TEnumFieldMap> table) where TEntity : IRecord where TEnumFieldMap : Enum
        {
            fieldRegistry.Add(new FieldMap
            {
                ItemType = typeof(TEntity),
                PropertyName = nameof(IRecord.Id),
                FieldId = PartnerApis.QuickBase.Constants.RecordIdFieldId
            });

            fieldRegistry.Add(new FieldMap
            {
                ItemType = typeof(TEntity),
                PropertyName = nameof(IRecord.Created),
                FieldId = PartnerApis.QuickBase.Constants.DateCreatedFieldId
            });

            fieldRegistry.Add(new FieldMap
            {
                ItemType = typeof(TEntity),
                PropertyName = nameof(IRecord.Modified),
                FieldId = PartnerApis.QuickBase.Constants.DateModifiedFieldId
            });

            return default;
        }

        /// <summary>
        /// Adds a propert mapping for an entity property
        /// </summary>
        /// <typeparam name="TEntity"></typeparam>
        /// <typeparam name="TEnumFieldMap"></typeparam>
        /// <param name="table"></param>
        /// <param name="property"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        internal static TableMap<TEntity, TEnumFieldMap> WithProperty<TEntity, TEnumFieldMap>(this TableMap<TEntity, TEnumFieldMap> table, Expression<Func<TEntity, object>> property, TEnumFieldMap field)
        {
            if (property.Body is MemberExpression memberExpression)
            {
                fieldRegistry.Add(new FieldMap
                {
                    ItemType = memberExpression.Member.DeclaringType,
                    PropertyName = memberExpression.Member.Name,
                    FieldId = field.To<int>()
                });
            }
            else if (property.Body is UnaryExpression unaryExpression && unaryExpression.Operand is MemberExpression unaryMemberExpression)
            {
                fieldRegistry.Add(new FieldMap
                {
                    ItemType = unaryMemberExpression.Member.DeclaringType,
                    PropertyName = unaryMemberExpression.Member.Name,
                    FieldId = field.To<int>()
                });
            }

            return default;
        }

        internal static int? GetFieldId(PropertyInfo info)
        {
            var map = fieldRegistry.FirstOrDefault(m => m.ItemType == info.DeclaringType && m.PropertyName == info.Name);

            return map != null ? map.FieldId : default;
        }

        internal static QuickBaseRecordContext GetTableContext(object item)
        {
            var context = new QuickBaseRecordContext();
            var itemType = item.GetType();
            var properties = itemType.GetProperties();

            context.Table = tableRegistry.FirstOrDefault(r => r.Key == itemType).Value;

            foreach (var property in properties)
            {
                var fieldId = GetFieldId(property);
                var value = property.GetValue(item);

                if (fieldId != null)
                {
                    context.FieldIds.Add(new KeyValuePair<int, object>(fieldId.Value, value));
                }
            }

            return context;
        }
    }
}