using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Linq;
using System.Threading.Tasks;
using BuildFeed.Model.View;
using MongoDB.Bson;
using MongoDB.Driver;

namespace BuildFeed.Model
{
   public partial class BuildRepository
   {
      private const string BUILD_COLLECTION_NAME = "builds";
      private static readonly BsonDocument sortByAddedDate = new BsonDocument(nameof(Build.Added), -1);
      private static readonly BsonDocument sortByCompileDate = new BsonDocument(nameof(Build.BuildTime), -1);
      private static readonly BsonDocument sortByLeakedDate = new BsonDocument(nameof(Build.LeakDate), -1);

      private static readonly BsonDocument sortByOrder = new BsonDocument
      {
         new BsonElement(nameof(Build.MajorVersion), -1),
         new BsonElement(nameof(Build.MinorVersion), -1),
         new BsonElement(nameof(Build.Number), -1),
         new BsonElement(nameof(Build.Revision), -1),
         new BsonElement(nameof(Build.BuildTime), -1)
      };

      private readonly IMongoCollection<Build> _buildCollection;

      public BuildRepository()
      {
         MongoClient dbClient = new MongoClient(new MongoClientSettings
         {
            Server = new MongoServerAddress(MongoConfig.Host, MongoConfig.Port)
         });

         IMongoDatabase buildDatabase = dbClient.GetDatabase(MongoConfig.Database);
         _buildCollection = buildDatabase.GetCollection<Build>(BUILD_COLLECTION_NAME);
      }

      public async Task SetupIndexes()
      {
         List<BsonDocument> indexes = await (await _buildCollection.Indexes.ListAsync()).ToListAsync();

         if (indexes.All(i => i["name"] != "_idx_group"))
         {
            await
               _buildCollection.Indexes.CreateOneAsync(
                  Builders<Build>.IndexKeys.Combine(Builders<Build>.IndexKeys.Descending(b => b.MajorVersion),
                     Builders<Build>.IndexKeys.Descending(b => b.MinorVersion),
                     Builders<Build>.IndexKeys.Descending(b => b.Number),
                     Builders<Build>.IndexKeys.Descending(b => b.Revision)),
                  new CreateIndexOptions
                  {
                     Name = "_idx_group"
                  });
         }

         if (indexes.All(i => i["name"] != "_idx_legacy"))
         {
            await _buildCollection.Indexes.CreateOneAsync(Builders<Build>.IndexKeys.Ascending(b => b.LegacyId),
               new CreateIndexOptions
               {
                  Name = "_idx_legacy"
               });
         }

         if (indexes.All(i => i["name"] != "_idx_lab"))
         {
            await _buildCollection.Indexes.CreateOneAsync(Builders<Build>.IndexKeys.Ascending(b => b.Lab),
               new CreateIndexOptions
               {
                  Name = "_idx_lab"
               });
         }

         if (indexes.All(i => i["name"] != "_idx_date"))
         {
            await _buildCollection.Indexes.CreateOneAsync(Builders<Build>.IndexKeys.Descending(b => b.BuildTime),
               new CreateIndexOptions
               {
                  Name = "_idx_date"
               });
         }
      }

      [DataObjectMethod(DataObjectMethodType.Select, true)]
      public async Task<List<Build>> Select() => await _buildCollection.Find(new BsonDocument()).ToListAsync();

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<Build> SelectById(Guid id) => await _buildCollection.Find(Builders<Build>.Filter.Eq(b => b.Id, id)).SingleOrDefaultAsync();

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<Build> SelectByLegacyId(long id) => await _buildCollection.Find(Builders<Build>.Filter.Eq(b => b.LegacyId, id)).SingleOrDefaultAsync();

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<List<Build>> SelectBuildsByOrder(int limit = -1, int skip = 0)
      {
         IFindFluent<Build, Build> query = _buildCollection.Find(new BsonDocument()).Sort(sortByOrder).Skip(skip);

         if (limit > 0)
         {
            query = query.Limit(limit);
         }

         return await query.ToListAsync();
      }

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<FrontPage> SelectFrontPage()
      {
         FrontPage fp = new FrontPage();

         IFindFluent<Build, Build> query = _buildCollection.Find(new BsonDocument
         {
            {
               nameof(Build.LabUrl), new BsonDocument
               {
                  { "$in", new BsonArray(ConfigurationManager.AppSettings["site:OSGLab"].Split(';')) }
               }
            }
         }).Sort(sortByCompileDate).Limit(1);
         fp.CurrentCanary = await query.FirstOrDefaultAsync();

         query = _buildCollection.Find(new BsonDocument
         {
            {
               nameof(Build.LabUrl), new BsonDocument
               {
                  { "$in", new BsonArray(ConfigurationManager.AppSettings["site:InsiderLab"].Split(';')) }
               }
            },
            {
               nameof(Build.SourceType), new BsonDocument
               {
                  {
                     "$in", new BsonArray
                     {
                        TypeOfSource.PublicRelease,
                        TypeOfSource.UpdateGDR
                     }
                  }
               }
            }
         }).Sort(sortByCompileDate).Limit(1);
         fp.CurrentInsider = await query.FirstOrDefaultAsync();

         query = _buildCollection.Find(new BsonDocument
         {
            {
               nameof(Build.LabUrl), new BsonDocument
               {
                  { "$in", new BsonArray(ConfigurationManager.AppSettings["site:ReleaseLab"].Split(';')) }
               }
            },
            {
               nameof(Build.SourceType), new BsonDocument
               {
                  {
                     "$in", new BsonArray
                     {
                        TypeOfSource.PublicRelease,
                        TypeOfSource.UpdateGDR
                     }
                  }
               }
            }
         }).Sort(sortByCompileDate).Limit(1);
         fp.CurrentRelease = await query.FirstOrDefaultAsync();

         return fp;
      }

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<List<Build>> SelectBuildsByCompileDate(int limit = -1, int skip = 0)
      {
         IFindFluent<Build, Build> query = _buildCollection.Find(new BsonDocument()).Sort(sortByCompileDate).Skip(skip);

         if (limit > 0)
         {
            query = query.Limit(limit);
         }

         return await query.ToListAsync();
      }

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<List<Build>> SelectBuildsByAddedDate(int limit = -1, int skip = 0)
      {
         IFindFluent<Build, Build> query = _buildCollection.Find(new BsonDocument()).Sort(sortByAddedDate).Skip(skip);

         if (limit > 0)
         {
            query = query.Limit(limit);
         }

         return await query.ToListAsync();
      }

      [DataObjectMethod(DataObjectMethodType.Select, false)]
      public async Task<List<Build>> SelectBuildsByLeakedDate(int limit = -1, int skip = 0)
      {
         IFindFluent<Build, Build> query = _buildCollection.Find(new BsonDocument()).Sort(sortByLeakedDate).Skip(skip);

         if (limit > 0)
         {
            query = query.Limit(limit);
         }

         return await query.ToListAsync();
      }

      [DataObjectMethod(DataObjectMethodType.Insert, true)]
      public async Task Insert(Build item)
      {
         item.Id = Guid.NewGuid();
         item.LabUrl = item.GenerateLabUrl();
         await _buildCollection.InsertOneAsync(item);
      }

      [DataObjectMethod(DataObjectMethodType.Insert, false)]
      public async Task InsertAll(IEnumerable<Build> items)
      {
         List<Build> generatedItems = new List<Build>();
         foreach (Build item in items)
         {
            item.Id = Guid.NewGuid();
            item.LabUrl = item.GenerateLabUrl();

            generatedItems.Add(item);
         }

         await _buildCollection.InsertManyAsync(generatedItems);
      }

      [DataObjectMethod(DataObjectMethodType.Update, true)]
      public async Task Update(Build item)
      {
         Build old = await SelectById(item.Id);
         item.Added = old.Added;
         item.Modified = DateTime.SpecifyKind(DateTime.Now, DateTimeKind.Utc);
         item.LabUrl = item.GenerateLabUrl();

         await _buildCollection.ReplaceOneAsync(Builders<Build>.Filter.Eq(b => b.Id, item.Id), item);
      }

      [DataObjectMethod(DataObjectMethodType.Delete, true)]
      public async Task DeleteById(Guid id)
      {
         await _buildCollection.DeleteOneAsync(Builders<Build>.Filter.Eq(b => b.Id, id));
      }
   }
}