using MediatR;
using mws.backend.dotnet.application.Common;
using mws.backend.dotnet.domain.Projects;

namespace mws.backend.dotnet.application.Projects;

public record GetProjectMembersQuery(Guid UserId, Guid ProjectId, int Page, int PageSize) : IRequest<PagedResult<ProjectMemberDto>>;

public class GetProjectMembersHandler(IUnitOfWork uow) : IRequestHandler<GetProjectMembersQuery, PagedResult<ProjectMemberDto>>
{
    public async Task<PagedResult<ProjectMemberDto>> Handle(GetProjectMembersQuery query, CancellationToken ct)
    {
        var isMember = await uow.Projects.IsMemberAsync(query.ProjectId, query.UserId, ct);
        if (!isMember)
        {
            throw new NotFoundException("Project not found");
        }

        var members = await uow.Projects.GetMembersWithUserAsync(query.ProjectId, query.Page, query.PageSize, ct);
        var permissions = await uow.Projects.GetMemberPermissionsAsync(query.ProjectId, ProjectPermissionScreens.Documents, ct);

        var items = members.Items.Select(m =>
        {
            permissions.TryGetValue(m.UserId, out var p);
            return new ProjectMemberDto
            {
                UserId = m.UserId,
                Username = m.User.Username,
                DisplayName = m.User.DisplayName,
                Role = m.Role,
                CanViewDocuments = m.Role == MemberRole.Owner || (p?.CanView ?? false),
                CanCreateDocuments = m.Role == MemberRole.Owner || (p?.CanCreate ?? false),
                CanEditDocuments = m.Role == MemberRole.Owner || (p?.CanEdit ?? false),
                CanDeleteDocuments = m.Role == MemberRole.Owner || (p?.CanDelete ?? false),
            };
        }).ToList();

        return new PagedResult<ProjectMemberDto>
        {
            Items = items,
            TotalCount = members.TotalCount,
            Page = members.Page,
            PageSize = members.PageSize,
        };
    }
}