@page "/templates"
@attribute [Authorize]
@inject IUserSessionService Session
@inject IUserContextAccessor UserContext
@inject ISessionManager SessionMgr
@inject IElevationCoordinator Elevation
@inject ITemplateService TemplateSvc
@inject SharepointToolbox.Web.Infrastructure.Persistence.TemplateRepository TemplateRepo
@rendermode InteractiveServer

<h1 class="page-title">Site Templates</h1>
<p class="page-subtitle">Capture site structure and apply to new sites.</p>

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

<div style="display:grid;grid-template-columns:1fr 1fr;gap:16px">
    <div class="card">
        <div class="card-title">Capture Template</div>
        <SitePicker Profile="Session.CurrentProfile!" @bind-SelectedSites="_captureSites" Single="true" />
        <div class="form-group mt-8">
            <label class="form-label">Template Name</label>
            <input class="form-input" @bind="_captureName" placeholder="My Template" />
        </div>
        <div class="flex-row" style="flex-wrap:wrap">
            <label><input type="checkbox" @bind="_capLibraries" /> Libraries</label>
            <label><input type="checkbox" @bind="_capFolders" /> Folders</label>
            <label><input type="checkbox" @bind="_capGroups" /> Permission groups</label>
        </div>
        <button class="btn btn-primary mt-8" @onclick="CaptureTemplate" disabled="@_running">
            @(_running ? "Capturing…" : "Capture")
        </button>
        <ProgressPanel IsRunning="_running" StatusMessage="@_status" />
    </div>

    <div class="card">
        <div class="card-title">Apply Template</div>
        @if (_selectedTemplate == null)
        {
            <div class="alert alert-info">Select a template from the list below.</div>
        }
        else
        {
            <div class="alert alert-info">Template: <strong>@_selectedTemplate.Name</strong></div>
            <div class="form-group">
                <label class="form-label">New Site Title</label>
                <input class="form-input" @bind="_newTitle" />
            </div>
            <div class="form-group">
                <label class="form-label">New Site Alias</label>
                <input class="form-input" @bind="_newAlias" />
            </div>
            <div class="form-group">
                <label class="form-label">Admin Center URL</label>
                <input class="form-input" @bind="_adminUrl" placeholder="https://contoso-admin.sharepoint.com" />
            </div>
            <button class="btn btn-primary" @onclick="ApplyTemplate" disabled="@_running">
                @(_running ? "Applying…" : "Apply Template")
            </button>
        }
    </div>
</div>

@if (!string.IsNullOrEmpty(_error)) { <div class="alert alert-error mt-8">@_error</div> }
@if (!string.IsNullOrEmpty(_successMsg)) { <div class="alert alert-success mt-8">@_successMsg</div> }

<div class="card" style="margin-top:16px">
    <div class="card-title">Saved Templates</div>
    @if (_templates.Count == 0)
    {
        <div class="text-muted">No templates saved.</div>
    }
    @foreach (var t in _templates)
    {
        <div class="flex-row" style="padding:8px 0;border-bottom:1px solid var(--border)">
            <div>
                <div style="font-weight:600">@t.Name</div>
                <div class="text-muted">@t.SiteType · @t.CapturedAt.ToString("yyyy-MM-dd") · @t.Libraries.Count libraries</div>
            </div>
            <div class="spacer"></div>
            <button class="btn btn-secondary btn-sm" @onclick="() => _selectedTemplate = t">Use</button>
            <button class="btn btn-danger btn-sm" @onclick="() => DeleteTemplate(t)">Delete</button>
        </div>
    }
</div>

@code {
    private List<SiteInfo> _captureSites = new();
    private string _captureName = string.Empty;
    private bool _capLibraries = true, _capFolders = true, _capGroups = true;
    private SiteTemplate? _selectedTemplate;
    private string _newTitle = string.Empty, _newAlias = string.Empty, _adminUrl = string.Empty;
    private bool _running; private string _status = string.Empty, _error = string.Empty, _successMsg = string.Empty;
    private List<SiteTemplate> _templates = new();
    private CancellationTokenSource? _cts;

    protected override async Task OnInitializedAsync()
    {
        _templates = (await TemplateRepo.GetAllAsync()).ToList();
    }

    private async Task CaptureTemplate()
    {
        _error = string.Empty; _successMsg = string.Empty; _running = true;
        _cts = new CancellationTokenSource();
        var siteUrl = _captureSites.FirstOrDefault()?.Url ?? Session.CurrentProfile!.TenantUrl;
        var progress = new Progress<OperationProgress>(p => { _status = p.Message; InvokeAsync(StateHasChanged); });
        try
        {
            var opts = new SiteTemplateOptions { CaptureLibraries = _capLibraries, CaptureFolders = _capFolders, CapturePermissionGroups = _capGroups };
            var template = await Elevation.RunAsync(async c =>
            {
                var ctx = await SessionMgr.GetOrCreateContextAsync(siteUrl, Session.CurrentProfile!, c);
                return await TemplateSvc.CaptureTemplateAsync(ctx, opts, progress, c);
            }, _cts.Token);
            template.Name = string.IsNullOrWhiteSpace(_captureName) ? $"Template-{DateTime.Now:yyyyMMdd}" : _captureName;
            await TemplateRepo.SaveAsync(template);
            _templates = (await TemplateRepo.GetAllAsync()).ToList();
            _successMsg = $"Template '{template.Name}' saved.";
        }
        catch (OperationCanceledException) { _status = "Cancelled."; }
        catch (Exception ex) { _error = ex.Message; }
        finally { _running = false; await InvokeAsync(StateHasChanged); }
    }

    private async Task ApplyTemplate()
    {
        if (_selectedTemplate == null) return;
        _error = string.Empty; _successMsg = string.Empty; _running = true;
        _cts = new CancellationTokenSource();
        var adminUrl = string.IsNullOrWhiteSpace(_adminUrl)
            ? Session.CurrentProfile!.TenantUrl.Replace(".sharepoint.com", "-admin.sharepoint.com")
            : _adminUrl.Trim();
        var progress = new Progress<OperationProgress>(p => { _status = p.Message; InvokeAsync(StateHasChanged); });
        try
        {
            var ctx = await SessionMgr.GetOrCreateContextAsync(adminUrl, Session.CurrentProfile!, _cts.Token);
            var url = await TemplateSvc.ApplyTemplateAsync(ctx, _selectedTemplate, _newTitle, _newAlias, progress, _cts.Token);
            _successMsg = $"Site created: {url}";
        }
        catch (OperationCanceledException) { _status = "Cancelled."; }
        catch (Exception ex) { _error = ex.Message; }
        finally { _running = false; await InvokeAsync(StateHasChanged); }
    }

    private async Task DeleteTemplate(SiteTemplate t)
    {
        await TemplateRepo.DeleteAsync(t.Id);
        _templates.RemoveAll(x => x.Id == t.Id);
        if (_selectedTemplate?.Id == t.Id) _selectedTemplate = null;
    }
}