namespace GmRelay.Web.Services;

public sealed class AuthorizedSessionService(ISessionStore sessionStore)
{
    public Task<List<WebGameGroup>> GetGroupsForGmAsync(long gmId) =>
        sessionStore.GetGroupsForGmAsync(gmId);

    public async Task<List<WebSession>?> GetUpcomingSessionsForGmAsync(Guid groupId, long gmId)
    {
        if (!await GroupBelongsToGmAsync(groupId, gmId))
        {
            return null;
        }

        return await sessionStore.GetUpcomingSessionsAsync(groupId);
    }

    public async Task<WebSession?> GetSessionForGmAsync(Guid sessionId, long gmId)
    {
        var session = await sessionStore.GetSessionAsync(sessionId);
        if (session is null)
        {
            return null;
        }

        return await GroupBelongsToGmAsync(session.GroupId, gmId) ? session : null;
    }

    public async Task UpdateSessionForGmAsync(Guid sessionId, long gmId, string title, DateTime scheduledAt, string joinLink)
    {
        var session = await GetSessionForGmAsync(sessionId, gmId);
        if (session is null)
        {
            throw new SessionAccessDeniedException(sessionId, gmId);
        }

        await sessionStore.UpdateSessionAsync(sessionId, session.GroupId, title, scheduledAt, joinLink);
    }

    private async Task<bool> GroupBelongsToGmAsync(Guid groupId, long gmId)
    {
        var group = await sessionStore.GetGroupAsync(groupId);
        return group?.GmTelegramId == gmId;
    }
}