using Microsoft.SharePoint.Client;
using SharepointToolbox.Web.Core.Helpers;
using SharepointToolbox.Web.Core.Models;
using SharepointToolbox.Web.Services.Session;

namespace SharepointToolbox.Web.Services;

public class LibraryDiscoveryService : ILibraryDiscoveryService
{
    private readonly IElevationCoordinator _elevation;
    private readonly ISessionManager _sessionManager;

    public LibraryDiscoveryService(IElevationCoordinator elevation, ISessionManager sessionManager)
    {
        _elevation = elevation;
        _sessionManager = sessionManager;
    }

    public async Task<IReadOnlyList<string>> ListLibrariesAsync(
        TenantProfile profile, string siteUrl, CancellationToken ct = default)
    {
        if (string.IsNullOrWhiteSpace(siteUrl)) return Array.Empty<string>();

        return await _elevation.RunAsync(async c =>
        {
            var ctx = await _sessionManager.GetOrCreateContextAsync(siteUrl, profile, c);
            ctx.Load(ctx.Web, w => w.Lists.Include(l => l.Title, l => l.Hidden, l => l.BaseType));
            await ExecuteQueryRetryHelper.ExecuteQueryRetryAsync(ctx, null, c);
            return (IReadOnlyList<string>)ctx.Web.Lists
                .Where(l => !l.Hidden && l.BaseType == BaseType.DocumentLibrary)
                .Select(l => l.Title)
                .OrderBy(t => t, StringComparer.OrdinalIgnoreCase)
                .ToList();
        }, ct);
    }
}