@page "/versions"
@attribute [Authorize]
@inject IUserSessionService Session
@inject IUserContextAccessor UserContext
@inject ISessionManager SessionMgr
@inject IElevationCoordinator Elevation
@inject IVersionCleanupService VersionSvc
@inject VersionCleanupHtmlExportService HtmlExport
@inject WebExportService WebExport
@rendermode InteractiveServer

<h1 class="page-title">Version Cleanup</h1>

@if (!Session.HasProfile) { <NoProfilePrompt /> return; }
@if (UserContext.Role < UserRole.TechN1) { <WriteGuard /> return; }

<div class="card">
    <div class="form-row">
        <div class="form-group">
            <label class="form-label">Site URL</label>
            <input class="form-input" @bind="_siteUrl" placeholder="@Session.CurrentProfile!.TenantUrl" />
        </div>
    </div>
    <div class="flex-row">
        <button class="btn btn-secondary" @onclick="LoadLibraries" disabled="@_loading">
            @(_loading ? "Loading…" : "Load Libraries")
        </button>
    </div>
    @if (_libraries.Count > 0)
    {
        <div class="form-group mt-8">
            <label class="form-label">Libraries (none = all)</label>
            <div style="max-height:200px;overflow-y:auto;border:1px solid var(--border);border-radius:4px;padding:4px">
                @foreach (var lib in _libraries)
                {
                    <label style="display:flex;align-items:center;gap:6px;padding:4px 8px;cursor:pointer">
                        <input type="checkbox" checked="@_selectedLibs.Contains(lib)" @onchange="e => ToggleLib(lib, (bool)e.Value!)" />
                        @lib
                    </label>
                }
            </div>
        </div>
    }
    <div class="form-row mt-8">
        <div class="form-group" style="flex:0 0 auto">
            <label class="form-label">Keep last N versions</label>
            <input class="form-input" type="number" @bind="_keepLast" min="0" max="999" style="width:80px" />
        </div>
        <div class="form-group" style="display:flex;align-items:center;padding-top:20px">
            <label><input type="checkbox" @bind="_keepFirst" /> Keep first version</label>
        </div>
    </div>
    <div class="flex-row mt-8">
        <button class="btn btn-danger" @onclick="RunCleanup" disabled="@_running">
            @(_running ? "Cleaning…" : "Delete Old Versions")
        </button>
        @if (_running) { <button class="btn btn-secondary" @onclick="Cancel">Cancel</button> }
    </div>
    <ProgressPanel IsRunning="_running" StatusMessage="_status" Current="_current" Total="_total" />
</div>

@if (!string.IsNullOrEmpty(_error)) { <div class="alert alert-error">@_error</div> }

@if (_results.Count > 0)
{
    <div class="card">
        <div class="flex-row">
            <div class="card-title">Results <span class="count-badge">@_results.Count files</span></div>
            <div class="spacer"></div>
            <button class="btn btn-secondary btn-sm" @onclick="ExportHtml">Export HTML</button>
        </div>
        <div class="alert alert-info">
            Versions deleted: <strong>@_results.Sum(r => r.VersionsDeleted)</strong> |
            Freed: <strong>@((_results.Sum(r => r.BytesFreed) / 1048576.0).ToString("F2")) MB</strong> |
            Errors: <strong>@_results.Count(r => r.Error != null)</strong>
        </div>
        <div class="data-table-wrap">
            <table class="data-table">
                <thead><tr><th>Library</th><th>File</th><th class="num">Before</th><th class="num">Deleted</th><th class="num">Freed (KB)</th><th>Error</th></tr></thead>
                <tbody>
                    @foreach (var r in _results.Take(500))
                    {
                        <tr>
                            <td>@r.Library</td>
                            <td title="@r.FileServerRelativeUrl">@r.FileName</td>
                            <td class="num">@r.VersionsBefore</td>
                            <td class="num">@r.VersionsDeleted</td>
                            <td class="num">@((r.BytesFreed / 1024.0).ToString("F1"))</td>
                            <td style="color:var(--danger)">@r.Error</td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>
    </div>
}

@code {
    private string _siteUrl = string.Empty;
    private int _keepLast = 5; private bool _keepFirst;
    private List<string> _libraries = new(), _selectedLibs = new();
    private bool _running, _loading; private string _status = string.Empty, _error = string.Empty;
    private int _current, _total;
    private List<VersionCleanupResult> _results = new();
    private CancellationTokenSource? _cts;

    private async Task LoadLibraries()
    {
        _loading = true; _error = string.Empty;
        try
        {
            var siteUrl = string.IsNullOrWhiteSpace(_siteUrl) ? Session.CurrentProfile!.TenantUrl : _siteUrl.Trim();
            _libraries = (await Elevation.RunAsync(async c =>
            {
                var ctx = await SessionMgr.GetOrCreateContextAsync(siteUrl, Session.CurrentProfile!, c);
                return await VersionSvc.ListLibraryTitlesAsync(ctx, c);
            }, CancellationToken.None)).ToList();
        }
        catch (Exception ex) { _error = ex.Message; }
        finally { _loading = false; }
    }

    private void ToggleLib(string lib, bool selected) { if (selected) _selectedLibs.Add(lib); else _selectedLibs.Remove(lib); }

    private async Task RunCleanup()
    {
        _error = string.Empty; _results.Clear(); _running = true;
        _cts = new CancellationTokenSource();
        var siteUrl = string.IsNullOrWhiteSpace(_siteUrl) ? Session.CurrentProfile!.TenantUrl : _siteUrl.Trim();
        var progress = new Progress<OperationProgress>(p => { _status = p.Message; _current = p.Current; _total = p.Total; InvokeAsync(StateHasChanged); });
        try
        {
            var opts = new VersionCleanupOptions(_selectedLibs, _keepLast, _keepFirst);
            _results = (await Elevation.RunAsync(async c =>
            {
                var ctx = await SessionMgr.GetOrCreateContextAsync(siteUrl, Session.CurrentProfile!, c);
                return await VersionSvc.DeleteOldVersionsAsync(ctx, opts, progress, c);
            }, _cts.Token)).ToList();
            _status = $"Complete: {_results.Sum(r => r.VersionsDeleted)} versions deleted.";
        }
        catch (OperationCanceledException) { _status = "Cancelled."; }
        catch (Exception ex) { _error = ex.Message; }
        finally { _running = false; await InvokeAsync(StateHasChanged); }
    }

    private void Cancel() => _cts?.Cancel();
    private async Task ExportHtml() { await WebExport.DownloadHtmlAsync(HtmlExport.BuildHtml(_results, Session.CurrentBranding), $"versions_{DateTime.Now:yyyyMMdd_HHmmss}.html"); }
}