using SharepointToolbox.Web.Core.Models;

namespace SharepointToolbox.Web.Core.Helpers;

public static class PermissionConsolidator
{
    internal static string MakeKey(UserAccessEntry entry)
        => string.Join("|",
            entry.UserLogin.ToLowerInvariant(),
            entry.PermissionLevel.ToLowerInvariant(),
            entry.AccessType.ToString(),
            entry.GrantedThrough.ToLowerInvariant());

    public static IReadOnlyList<ConsolidatedPermissionEntry> Consolidate(IReadOnlyList<UserAccessEntry> entries)
    {
        if (entries.Count == 0) return Array.Empty<ConsolidatedPermissionEntry>();
        return entries
            .GroupBy(e => MakeKey(e))
            .Select(g =>
            {
                var first = g.First();
                var locations = g.Select(e => new LocationInfo(
                    e.SiteUrl, e.SiteTitle, e.ObjectTitle, e.ObjectUrl, e.ObjectType)).ToList();
                return new ConsolidatedPermissionEntry(
                    first.UserDisplayName, first.UserLogin, first.PermissionLevel,
                    first.AccessType, first.GrantedThrough, first.IsHighPrivilege,
                    first.IsExternalUser, locations,
                    first.TargetUrl, first.TargetLabel, first.SharingLinkType);
            })
            .OrderBy(c => c.UserLogin).ThenBy(c => c.PermissionLevel).ToList();
    }
}