@page "/duplicates"
@attribute [Authorize]
@inject IUserSessionService Session
@inject ISessionManager SessionMgr
@inject IElevationCoordinator Elevation
@inject IDuplicatesService DupSvc
@inject DuplicatesCsvExportService CsvExport
@inject DuplicatesHtmlExportService HtmlExport
@inject WebExportService WebExport
@rendermode InteractiveServer

<h1 class="page-title">Duplicate Detection</h1>

@if (!Session.HasProfile) { <NoProfilePrompt /> return; }

<div class="card">
    <SitePicker Profile="Session.CurrentProfile!" @bind-SelectedSites="_sites" />
    <div class="form-row mt-8">
        <div class="form-group">
            <label class="form-label">Mode</label>
            <select class="form-select" @bind="_mode" style="width:120px">
                <option value="Files">Files</option>
                <option value="Folders">Folders</option>
            </select>
        </div>
        <div class="form-group">
            <label class="form-label">Library (optional)</label>
            <input class="form-input" @bind="_library" />
        </div>
    </div>
    <div class="flex-row">
        <label><input type="checkbox" @bind="_matchSize" /> Match size</label>
        <label><input type="checkbox" @bind="_matchCreated" /> Match created</label>
        <label><input type="checkbox" @bind="_matchModified" /> Match modified</label>
        @if (_mode == "Folders")
        {
            <label><input type="checkbox" @bind="_matchFolderCount" /> Match subfolder count</label>
            <label><input type="checkbox" @bind="_matchFileCount" /> Match file count</label>
        }
    </div>
    <div class="flex-row mt-8">
        <button class="btn btn-primary" @onclick="RunScan" disabled="@_running">
            @(_running ? "Scanning…" : "Find Duplicates")
        </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">Duplicate Groups <span class="count-badge">@_results.Count</span></div>
            <div class="spacer"></div>
            <MergeModeSelect Value="_mergeMode" ValueChanged="v => _mergeMode = v" Visible="_bySite.Count > 1" />
            <button class="btn btn-secondary btn-sm" @onclick="ExportCsv">Export CSV</button>
            <button class="btn btn-secondary btn-sm" @onclick="ExportHtml">Export HTML</button>
        </div>
        @foreach (var g in _results.Take(100))
        {
            <div style="margin-bottom:8px;border:1px solid var(--border);border-radius:4px;overflow:hidden">
                <div style="background:#f0f0f0;padding:6px 12px;font-weight:600;font-size:13px">
                    @g.Name <span class="chip chip-blue">@g.Items.Count copies</span>
                </div>
                @foreach (var item in g.Items)
                {
                    <div style="padding:4px 12px;font-size:12px;border-top:1px solid var(--border)">
                        <span style="color:var(--text-muted)">@item.Library</span> › @item.Path
                        @if (item.SizeBytes.HasValue) { <span class="text-muted"> (@((item.SizeBytes.Value/1024.0).ToString("F1")) KB)</span> }
                    </div>
                }
            </div>
        }
        @if (_results.Count > 100) { <div class="text-muted mt-8">Showing first 100 groups. Export for all.</div> }
    </div>
}

@code {
    private List<SiteInfo> _sites = new();
    private string _library = string.Empty, _mode = "Files";
    private bool _matchSize = true, _matchCreated, _matchModified, _matchFolderCount, _matchFileCount;
    private bool _running; private string _status = string.Empty, _error = string.Empty;
    private int _current, _total;
    private List<DuplicateGroup> _results = new();
    private List<(string Label, IReadOnlyList<DuplicateGroup> Results)> _bySite = new();
    private ReportMergeMode _mergeMode = ReportMergeMode.SingleMerged;
    private CancellationTokenSource? _cts;

    private async Task RunScan()
    {
        _error = string.Empty; _results = new(); _bySite = new(); _running = true;
        _cts = new CancellationTokenSource();
        if (_sites.Count == 0) { _error = "Please select at least one site."; _running = false; return; }
        var progress = new Progress<OperationProgress>(p => { _status = p.Message; _current = p.Current; _total = p.Total; InvokeAsync(StateHasChanged); });
        try
        {
            var opts = new DuplicateScanOptions(_mode, _matchSize, _matchCreated, _matchModified, _matchFolderCount, _matchFileCount, Library: _library.TrimOrNull());
            var bySite = new List<(string, IReadOnlyList<DuplicateGroup>)>();
            var flat = new List<DuplicateGroup>();
            int i = 0;
            foreach (var site in _sites)
            {
                _cts.Token.ThrowIfCancellationRequested();
                _status = $"Scanning {site.Title} ({++i}/{_sites.Count})…";
                await InvokeAsync(StateHasChanged);
                var groups = await Elevation.RunAsync(async c =>
                {
                    var ctx = await SessionMgr.GetOrCreateContextAsync(site.Url, Session.CurrentProfile!, c);
                    return await DupSvc.ScanDuplicatesAsync(ctx, opts, progress, c);
                }, _cts.Token);
                bySite.Add((site.Title, groups));
                flat.AddRange(groups);
            }
            _bySite = bySite; _results = flat;
            _status = $"Found {_results.Count} duplicate groups across {_sites.Count} site(s).";
        }
        catch (OperationCanceledException) { _status = "Cancelled."; }
        catch (Exception ex) { _error = ex.Message; }
        finally { _running = false; await InvokeAsync(StateHasChanged); }
    }

    private void Cancel() => _cts?.Cancel();
    private async Task ExportCsv()
    {
        var ts = DateTime.Now.ToString("yyyyMMdd_HHmmss");
        var output = ReportMergeHelper.Build(_bySite, _mergeMode, "duplicates", ts, ReportFormat.Csv, rs => CsvExport.BuildCsv(rs));
        await WebExport.DownloadBytesAsync(output.Bytes, output.FileName, output.Mime);
    }
    private async Task ExportHtml()
    {
        var ts = DateTime.Now.ToString("yyyyMMdd_HHmmss");
        var output = ReportMergeHelper.Build(_bySite, _mergeMode, "duplicates", ts, ReportFormat.Html, rs => HtmlExport.BuildHtml(rs, Session.CurrentBranding));
        await WebExport.DownloadBytesAsync(output.Bytes, output.FileName, output.Mime);
    }
}