// using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using System.Security.Claims;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.ChangeTracking;
using PhoneToolMX.Models;
using System.Net.NetworkInformation;

// ReSharper disable CheckNamespace
// ReSharper disable UnusedAutoPropertyAccessor.Global

namespace PhoneToolMX.Data {
    public class PTMXContext : DbContext
    {
        public DbSet<Phone> Phones { get; set; }
        public DbSet<PhoneModel> PhoneModels { get; set; }
        public DbSet<Extension> Extensions { get; set; }
        public DbSet<CustomData> CustomData { get; set; }
        public DbSet<User> Users { get; set; }

        public PTMXContext(DbContextOptions<PTMXContext> options) : base(options)
        {
        }

        #region Public helpers
        
        /// <summary>
        /// Adds an <see cref="IOwnedModel"/> entity to the database, marking the given <see cref="User"/> as its owner.
        /// </summary>
        /// <param name="owner">The <see cref="User"/> that owns this entity.</param>
        /// <param name="entity">The entity to be created.</param>
        /// <typeparam name="TEntity">A model conforming to <see cref="IOwnedModel"/>.</typeparam>
        /// <returns>The entity entry for the created entity.</returns>
        public async Task<EntityEntry<TEntity>> AddOwnable<TEntity>(User owner, TEntity entity) where TEntity: OwnedBase
        {
            var set = Set<TEntity>();
            entity.Owners ??= new List<User>();
            entity.Owners.Add(owner);
            var entry = await AddAsync(entity);
            return entry;
        }

        /// <summary>
        /// Gets all entities of a certain model owned by the <see cref="User"/>.
        /// </summary>
        /// <param name="owner">The <see cref="User"/> object to be considered the owner.</param>
        /// <typeparam name="TEntity">A model conforming to <see cref="IOwnedModel"/></typeparam>
        /// <returns>All entities of the model owned by the given user</returns>
        public ICollection<TEntity> GetOwned<TEntity>(User owner) where TEntity : class, IOwnedModel
        {
            if (owner == null) return null;
            var entity = Set<TEntity>().Where(x => x.Owners.Any(o => o.Id == owner.Id));
            // eager load all w/ AlwaysInclude
            entity = typeof(TEntity).GetProperties()
                .Where(p => p.GetCustomAttributes(typeof(AlwaysIncludeAttribute), true)
                    .Length != 0)
                .Aggregate(entity, (current, prop) => current.Include(prop.Name));
            return entity.ToList();
        }

        /// <summary>
        /// Gets a model entity by its Id
        /// </summary>
        /// <param name="id">Id of the model, or null if you're like that</param>
        /// <typeparam name="TEntity">A model confirming to <see cref="IModel"/> that has a given DbSet</typeparam>
        /// <returns>The model defined by the Id, or null if none exist.</returns>
        /// <remarks>If null is provided as the id, null will be returned. <c>id</c> is nullable solely for compatibility.
        /// </remarks>
        public TEntity GetEntityById<TEntity>(int? id) where TEntity : class, IModel
        {
            return id == null ? null : Set<TEntity>().FirstOrDefault(o => o.Id == id);
        }
        
        #endregion
        
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            // Core of PTMX: Phones and extensions
            var ext = modelBuilder.Entity<Extension>();
            ext.HasKey(x => x.Id);
            ext.Property(x => x.Id).UseIdentityColumn();
            ext.Property(x => x.ExtId).HasComputedColumnSql("\"Id\" + 1000", stored: true);
            
            var phone = modelBuilder.Entity<Phone>();
            phone
                .HasMany(p => p.Extensions)
                .WithMany(x => x.Phones);
            phone.HasKey(p => p.Id);
            phone.Property(p => p.Id).UseIdentityColumn();
            // Randomly generates a 24-char password
            phone
                .Property(p => p.Password)
                .HasDefaultValueSql("encode(gen_random_bytes(18), 'base64')");

            // Wallpapers, ringtones, etc
            var cd = modelBuilder.Entity<CustomData>();
            cd.HasKey(c => c.Id);
            cd.Property(c => c.Id).UseIdentityColumn();
            
            // Phone models, for custom tests
            var pm = modelBuilder.Entity<PhoneModel>();
            pm.HasKey(p => p.Id);
            pm.Property(p => p.Id).UseIdentityColumn();
            pm.HasData(new PhoneModel
            {
                Id = 0,
                ModelName = "Polycom VVX300/310",
                MaxExtensions = 6,
                PreVvxPolycom = false,
            });
            
            // Authz/RBAC
            var userEnt = modelBuilder.Entity<User>();
            userEnt
                .HasMany(u => u.Phones)
                .WithMany(p => p.Owners);
            userEnt
                .HasMany(u => u.Extensions)
                .WithMany(x => x.Owners);
            userEnt
                .HasKey(u => u.Id);

            modelBuilder.Entity<Role>()
                .HasKey(r => r.Id);
        }
    }
}