using OwnChar.Api.Packets;
using OwnChar.Api.Packets.General;
using OwnChar.Api.Packets.Groups;
using OwnChar.Api.Updates;
using OwnChar.Data;
using OwnChar.Data.Model.Client;
using OwnChar.Server.Data.Model;
using OwnChar.Server.Extensions;

namespace OwnChar.Server.Api.Endpoint.Implementations;

internal class GroupsApi(IServer server) : IApiEndpoint
{
    public void Initialize(IApiBuilder builder)
    {
        builder.Map("/groups/get/byid", GetById);
        builder.Map("/groups/get", Get);
        builder.Map("/groups/create", Create);
        builder.Map("/groups/update", Update);
        builder.Map("/groups/delete", Delete);
        builder.Map("/groups/members/get", GetMembers);
        builder.Map("/groups/members/add", AddMembers);
        builder.Map("/groups/members/update", UpdateMember);
        builder.Map("/groups/members/remove", RemoveMembers);
    }

    private IResult GetById(GetSinlgeObjectRequest request)
    {
        if (!server.CheckLogin(request, UserType.Guest, out UserAccountDb? user))
            return TypedResults.Unauthorized();

        if (server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.ObjectId && n.Members.Any(m => m.User != null && m.User.Id == user.Id)) is not GroupDb group)
            return TypedResults.Ok(new GetSingleObjectResponse<Group>(null).With(OwnCharResponseError.NotFound));

        return TypedResults.Ok(new GetSingleObjectResponse<Group>(group.ToClient()));
    }

    private IResult Get(GetGroupsRequest request)
    {
        if (!server.CheckLogin(request, UserType.Guest, out UserAccountDb? user))
            return TypedResults.Unauthorized();

        IQueryable<GroupDb> groups;

        if (request.UseProfileId && server.Data!.Set<UserProfileDb>().FirstOrDefault(p => p.Id == request.ProfileId) is UserProfileDb profile)
            groups = server.Data!.Set<GroupDb>().Where(group => group.Members.Any(m => m.User != null && m.User.Id == profile.Id));
        else if (request.IncludeNonPublic && user.Is(UserType.Admin))
            groups = server.Data!.Set<GroupDb>();
        else
            groups = Array.Empty<GroupDb>().AsQueryable(); // Currently not supported.

        return TypedResults.Ok(new GetGroupsResponse([.. groups.Select(g => g.ToClient())]));
    }

    private IResult Create(CreateGroupRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user))
            return TypedResults.Unauthorized();

        var group = new GroupDb();
        
        if (!string.IsNullOrWhiteSpace(request.Name))
            group.Name = request.Name;

        group.Members.Add(new()
        {
            User = user.Profile,
            Level = MemberLevel.Owner,
        });

        server.Data!.Update(group);
        server.Data.SaveChanges();

        return TypedResults.Ok(new CreateGroupResponse(group.ToClient()));
    }

    private IResult Update(UpdateRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.Update.Id) is not GroupDb group
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Admin
            || user.IsNot(UserType.Admin)))
            return TypedResults.Unauthorized();

        if (request.Update is not GroupUpdate update)
            return TypedResults.Ok(new UpdateResponse().With(OwnCharResponseError.Default));

        group.Name = update.Name;
        group.Fandom = update.Fandom;

        server.Data.Update(group);
        server.Data.SaveChanges();

        return TypedResults.Ok(new UpdateResponse());
    }

    private IResult Delete(DeleteObjectRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.ObjectId) is not GroupDb group
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Owner)
            || user.IsNot(UserType.Admin))
            return TypedResults.Unauthorized();

        server.Data.Remove(group);
        server.Data.SaveChanges();

        return TypedResults.Ok(new DeleteObjectResponse());
    }

    private IResult GetMembers(GetGroupMembersRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.GroupId) is not GroupDb group
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Member)
            || user.IsNot(UserType.Admin))
            return TypedResults.Unauthorized();

        var members = group.Members.Select(n => n.ToClient());
        return TypedResults.Ok(new GetGroupMembersResponse(members.ToList()));
    }

    private IResult AddMembers(GroupMemberAddRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.GroupId) is not GroupDb group
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Admin)
            || user.IsNot(UserType.Admin))
            return TypedResults.Unauthorized();

        var addedMembers = new List<MemberEntryDb>();

        foreach (var kvp in request.Members)
        {
            if (group.Members.FirstOrDefault(m => m.User != null && m.User.Id == kvp.Key) is not MemberEntryDb member
                && server.Data.Set<UserProfileDb>().FirstOrDefault(u => u.Id == kvp.Key) is UserProfileDb mu)
            {
                member = new()
                {
                    User = mu,
                    Level = kvp.Value,
                };
                server.Data.Update(member);
                server.Data.Update(group);
                server.Data.SaveChanges();
            }
        }

        return TypedResults.Ok(new GroupMemberAddResponse(addedMembers.Select(m => m.ToClient()).ToList()));
    }

    private IResult UpdateMember(UpdateRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Id == request.Update.Id) is not GroupDb group
            || group.Members.FirstOrDefault(m => m.Id == request.Update.Id) is not MemberEntryDb member
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Admin
            || user.IsNot(UserType.Admin)))
            return TypedResults.Unauthorized();

        if (request.Update is not MemberUpdate update)
            return TypedResults.Ok(new UpdateResponse().With(OwnCharResponseError.Default));

        member.Level = update.Level;

        server.Data.Update(member);
        server.Data.SaveChanges();

        return TypedResults.Ok(new UpdateResponse());
    }

    private IResult RemoveMembers(DeleteObjectRequest request)
    {
        if (!server.CheckLogin(request, UserType.User, out UserAccountDb? user)
            || server.Data?.Set<MemberEntryDb>().FirstOrDefault(m => m.Id == request.ObjectId) is not MemberEntryDb member
            || server.Data?.Set<GroupDb>().FirstOrDefault(n => n.Members.Contains(member)) is not GroupDb group
            || !group.Members.Any(m => m.Id == user.Profile!.Id && m.Level >= MemberLevel.Admin
            || user.IsNot(UserType.Admin)))
            return TypedResults.Unauthorized();

        group.Members.Remove(member);
        server.Data.Remove(member);
        server.Data.Update(group);
        server.Data.SaveChanges();

        return TypedResults.Ok(new DeleteObjectResponse());
    }
}