using AutoMapper;
using Bit.Core.Models.Data;
using Bit.Core.Repositories;
using Bit.Infrastructure.EntityFramework.Models;
using Bit.Infrastructure.EntityFramework.Repositories.Queries;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;

namespace Bit.Infrastructure.EntityFramework.Repositories;

public class CollectionRepository : Repository<Core.Entities.Collection, Collection, Guid>, ICollectionRepository
{
    public CollectionRepository(IServiceScopeFactory serviceScopeFactory, IMapper mapper)
        : base(serviceScopeFactory, mapper, (DatabaseContext context) => context.Collections)
    { }

    public override async Task<Core.Entities.Collection> CreateAsync(Core.Entities.Collection collection)
    {
        await base.CreateAsync(collection);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            await dbContext.UserBumpAccountRevisionDateByCollectionIdAsync(collection.Id, collection.OrganizationId);
            await dbContext.SaveChangesAsync();
        }
        return collection;
    }

    public override async Task DeleteAsync(Core.Entities.Collection collection)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            await dbContext.UserBumpAccountRevisionDateByCollectionIdAsync(collection.Id, collection.OrganizationId);
            await dbContext.SaveChangesAsync();
        }
        await base.DeleteAsync(collection);
    }

    public override async Task UpsertAsync(Core.Entities.Collection collection)
    {
        await base.UpsertAsync(collection);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            await dbContext.UserBumpAccountRevisionDateByCollectionIdAsync(collection.Id, collection.OrganizationId);
            await dbContext.SaveChangesAsync();
        }
    }

    public async Task CreateAsync(Core.Entities.Collection obj, IEnumerable<SelectionReadOnly> groups)
    {
        await CreateAsync(obj);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var availibleGroups = await (from g in dbContext.Groups
                                         where g.OrganizationId == obj.OrganizationId
                                         select g.Id).ToListAsync();
            var collectionGroups = groups
                .Where(g => availibleGroups.Contains(g.Id))
                .Select(g => new CollectionGroup
                {
                    CollectionId = obj.Id,
                    GroupId = g.Id,
                    ReadOnly = g.ReadOnly,
                    HidePasswords = g.HidePasswords,
                });
            await dbContext.AddRangeAsync(collectionGroups);
            await dbContext.UserBumpAccountRevisionDateByOrganizationIdAsync(obj.OrganizationId);
            await dbContext.SaveChangesAsync();
        }
    }

    public async Task DeleteUserAsync(Guid collectionId, Guid organizationUserId)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var query = from cu in dbContext.CollectionUsers
                        where cu.CollectionId == collectionId &&
                            cu.OrganizationUserId == organizationUserId
                        select cu;
            dbContext.RemoveRange(await query.ToListAsync());
            await dbContext.UserBumpAccountRevisionDateByOrganizationUserIdAsync(organizationUserId);
            await dbContext.SaveChangesAsync();
        }
    }

    public async Task<CollectionDetails> GetByIdAsync(Guid id, Guid userId)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            return (await GetManyByUserIdAsync(userId)).FirstOrDefault(c => c.Id == id);
        }
    }

    public async Task<Tuple<Core.Entities.Collection, ICollection<SelectionReadOnly>>> GetByIdWithGroupsAsync(Guid id)
    {
        var collection = await base.GetByIdAsync(id);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var collectionGroups = await (from cg in dbContext.CollectionGroups
                                          where cg.CollectionId == id
                                          select cg).ToListAsync();
            var selectionReadOnlys = collectionGroups.Select(cg => new SelectionReadOnly
            {
                Id = cg.GroupId,
                ReadOnly = cg.ReadOnly,
                HidePasswords = cg.HidePasswords,
            }).ToList();
            return new Tuple<Core.Entities.Collection, ICollection<SelectionReadOnly>>(collection, selectionReadOnlys);
        }
    }

    public async Task<Tuple<CollectionDetails, ICollection<SelectionReadOnly>>> GetByIdWithGroupsAsync(Guid id, Guid userId)
    {
        var collection = await GetByIdAsync(id, userId);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var query = from cg in dbContext.CollectionGroups
                        where cg.CollectionId.Equals(id)
                        select new SelectionReadOnly
                        {
                            Id = cg.GroupId,
                            ReadOnly = cg.ReadOnly,
                            HidePasswords = cg.HidePasswords,
                        };
            var configurations = await query.ToArrayAsync();
            return new Tuple<CollectionDetails, ICollection<SelectionReadOnly>>(collection, configurations);
        }
    }

    public async Task<int> GetCountByOrganizationIdAsync(Guid organizationId)
    {
        var query = new CollectionReadCountByOrganizationIdQuery(organizationId);
        return await GetCountFromQuery(query);
    }

    public async Task<ICollection<Core.Entities.Collection>> GetManyByOrganizationIdAsync(Guid organizationId)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var query = from c in dbContext.Collections
                        where c.OrganizationId == organizationId
                        select c;
            var collections = await query.ToArrayAsync();
            return collections;
        }
    }

    public async Task<ICollection<CollectionDetails>> GetManyByUserIdAsync(Guid userId)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            return await (from c in new UserCollectionDetailsQuery(userId).Run(dbContext)
                          group c by new { c.Id, c.OrganizationId, c.Name, c.CreationDate, c.RevisionDate, c.ExternalId } into collectionGroup
                          select new CollectionDetails
                          {
                              Id = collectionGroup.Key.Id,
                              OrganizationId = collectionGroup.Key.OrganizationId,
                              Name = collectionGroup.Key.Name,
                              CreationDate = collectionGroup.Key.CreationDate,
                              RevisionDate = collectionGroup.Key.RevisionDate,
                              ExternalId = collectionGroup.Key.ExternalId,
                              ReadOnly = Convert.ToBoolean(collectionGroup.Min(c => Convert.ToInt32(c.ReadOnly))),
                              HidePasswords = Convert.ToBoolean(collectionGroup.Min(c => Convert.ToInt32(c.HidePasswords))),
                          }).ToListAsync();
        }
    }

    public async Task<ICollection<SelectionReadOnly>> GetManyUsersByIdAsync(Guid id)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var query = from cu in dbContext.CollectionUsers
                        where cu.CollectionId == id
                        select cu;
            var collectionUsers = await query.ToListAsync();
            return collectionUsers.Select(cu => new SelectionReadOnly
            {
                Id = cu.OrganizationUserId,
                ReadOnly = cu.ReadOnly,
                HidePasswords = cu.HidePasswords,
            }).ToArray();
        }
    }

    public async Task ReplaceAsync(Core.Entities.Collection collection, IEnumerable<SelectionReadOnly> groups)
    {
        await UpsertAsync(collection);
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);
            var groupsInOrg = dbContext.Groups.Where(g => g.OrganizationId == collection.OrganizationId);
            var modifiedGroupEntities = dbContext.Groups.Where(x => groups.Select(x => x.Id).Contains(x.Id));
            var target = (from cg in dbContext.CollectionGroups
                          join g in modifiedGroupEntities
                              on cg.CollectionId equals collection.Id into s_g
                          from g in s_g.DefaultIfEmpty()
                          where g == null || cg.GroupId == g.Id
                          select new { cg, g }).AsNoTracking();
            var source = (from g in modifiedGroupEntities
                          from cg in dbContext.CollectionGroups
                              .Where(cg => cg.CollectionId == collection.Id && cg.GroupId == g.Id).DefaultIfEmpty()
                          select new { cg, g }).AsNoTracking();
            var union = await target
                .Union(source)
                .Where(x =>
                    x.cg == null ||
                    ((x.g == null || x.g.Id == x.cg.GroupId) &&
                    (x.cg.CollectionId == collection.Id)))
                .AsNoTracking()
                .ToListAsync();
            var insert = union.Where(x => x.cg == null && groupsInOrg.Any(c => x.g.Id == c.Id))
                .Select(x => new CollectionGroup
                {
                    CollectionId = collection.Id,
                    GroupId = x.g.Id,
                    ReadOnly = groups.FirstOrDefault(g => g.Id == x.g.Id).ReadOnly,
                    HidePasswords = groups.FirstOrDefault(g => g.Id == x.g.Id).HidePasswords,
                }).ToList();
            var update = union
                .Where(
                    x => x.g != null &&
                    x.cg != null &&
                    (x.cg.ReadOnly != groups.FirstOrDefault(g => g.Id == x.g.Id).ReadOnly ||
                    x.cg.HidePasswords != groups.FirstOrDefault(g => g.Id == x.g.Id).HidePasswords)
                )
                .Select(x => new CollectionGroup
                {
                    CollectionId = collection.Id,
                    GroupId = x.g.Id,
                    ReadOnly = groups.FirstOrDefault(g => g.Id == x.g.Id).ReadOnly,
                    HidePasswords = groups.FirstOrDefault(g => g.Id == x.g.Id).HidePasswords,
                });
            var delete = union
                .Where(
                    x => x.g == null &&
                    x.cg.CollectionId == collection.Id
                )
                .Select(x => new CollectionGroup
                {
                    CollectionId = collection.Id,
                    GroupId = x.cg.GroupId,
                })
                .ToList();

            await dbContext.AddRangeAsync(insert);
            dbContext.UpdateRange(update);
            dbContext.RemoveRange(delete);
            await dbContext.UserBumpAccountRevisionDateByCollectionIdAsync(collection.Id, collection.OrganizationId);
            await dbContext.SaveChangesAsync();
        }
    }

    public async Task UpdateUsersAsync(Guid id, IEnumerable<SelectionReadOnly> requestedUsers)
    {
        using (var scope = ServiceScopeFactory.CreateScope())
        {
            var dbContext = GetDatabaseContext(scope);

            var organizationId = await dbContext.Collections
                .Where(c => c.Id == id)
                .Select(c => c.OrganizationId)
                .FirstOrDefaultAsync();

            var existingCollectionUsers = await dbContext.CollectionUsers
                .Where(cu => cu.CollectionId == id)
                .ToListAsync();

            foreach (var requestedUser in requestedUsers)
            {
                var existingCollectionUser = existingCollectionUsers.FirstOrDefault(cu => cu.OrganizationUserId == requestedUser.Id);
                if (existingCollectionUser == null)
                {
                    // This is a brand new entry
                    dbContext.CollectionUsers.Add(new CollectionUser
                    {
                        CollectionId = id,
                        OrganizationUserId = requestedUser.Id,
                        HidePasswords = requestedUser.HidePasswords,
                        ReadOnly = requestedUser.ReadOnly,
                    });
                    continue;
                }

                // It already exists, update it
                existingCollectionUser.HidePasswords = requestedUser.HidePasswords;
                existingCollectionUser.ReadOnly = requestedUser.ReadOnly;
                dbContext.CollectionUsers.Update(existingCollectionUser);
            }

            // Remove all existing ones that are no longer requested
            var requestedUserIds = requestedUsers.Select(u => u.Id);
            dbContext.CollectionUsers.RemoveRange(existingCollectionUsers.Where(cu => !requestedUserIds.Contains(cu.OrganizationUserId)));
            await dbContext.UserBumpAccountRevisionDateByCollectionIdAsync(id, organizationId);
            await dbContext.SaveChangesAsync();
        }
    }
}