@inject ISiteDiscoveryService SiteDiscovery

<div class="site-picker">
    <div class="flex-row" style="gap:8px;align-items:flex-end">
        <div class="form-group" style="flex:1">
            <label class="form-label">@(Single ? "Site" : "Sites")</label>
            <input class="form-input" @bind="_filter" @bind:event="oninput" placeholder="Filter loaded sites by name or URL…" />
        </div>
        <button class="btn btn-secondary" @onclick="LoadSites" disabled="@_loading">
            @(_loading ? "Loading…" : (_all.Count > 0 ? "Reload sites" : "Load sites"))
        </button>
    </div>

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

    @if (_all.Count > 0)
    {
        <div class="flex-row mt-8" style="gap:12px;align-items:center">
            @if (!Single)
            {
                <button class="btn btn-link btn-sm" @onclick="SelectAllFiltered">Select all (@Filtered.Count())</button>
            }
            <button class="btn btn-link btn-sm" @onclick="ClearSelection">Clear</button>
            <span class="spacer"></span>
            <span class="count-badge">@SelectedSites.Count selected</span>
        </div>
        <div class="site-picker-list" style="max-height:240px;overflow:auto;border:1px solid var(--border);border-radius:4px;padding:4px;margin-top:6px">
            @foreach (var s in Filtered)
            {
                <label style="display:flex;align-items:center;gap:8px;padding:3px 6px;cursor:pointer">
                    @if (Single)
                    {
                        <input type="radio" name="@_radioName" checked="@IsSelected(s)" @onchange="e => SelectSingle(s)" />
                    }
                    else
                    {
                        <input type="checkbox" checked="@IsSelected(s)" @onchange="e => Toggle(s, (bool)(e.Value ?? false))" />
                    }
                    <span>@s.Title</span>
                    <span class="text-muted" style="font-size:11px">@s.Url</span>
                </label>
            }
            @if (!Filtered.Any())
            {
                <div class="text-muted" style="padding:6px">No sites match the filter.</div>
            }
        </div>
    }
    else if (!_loading)
    {
        <div class="text-muted mt-8" style="font-size:12px">Click “Load sites” to list the tenant’s SharePoint sites, then @(Single ? "pick one." : "tick the ones to scan.")</div>
    }
</div>

@code {
    [Parameter] public TenantProfile Profile { get; set; } = default!;
    [Parameter] public List<SiteInfo> SelectedSites { get; set; } = new();
    [Parameter] public EventCallback<List<SiteInfo>> SelectedSitesChanged { get; set; }
    [Parameter] public bool Disabled { get; set; }
    [Parameter] public bool Single { get; set; }

    private readonly string _radioName = "sp-" + Guid.NewGuid().ToString("N");
    private List<SiteInfo> _all = new();
    private string _filter = string.Empty;
    private bool _loading;
    private string _error = string.Empty;

    private IEnumerable<SiteInfo> Filtered =>
        string.IsNullOrWhiteSpace(_filter)
            ? _all
            : _all.Where(s =>
                s.Title.Contains(_filter, StringComparison.OrdinalIgnoreCase) ||
                s.Url.Contains(_filter, StringComparison.OrdinalIgnoreCase));

    private bool IsSelected(SiteInfo s) =>
        SelectedSites.Any(x => string.Equals(x.Url, s.Url, StringComparison.OrdinalIgnoreCase));

    private async Task LoadSites()
    {
        _loading = true; _error = string.Empty;
        try
        {
            _all = (await SiteDiscovery.SearchSitesAsync(Profile)).ToList();
            if (_all.Count == 0) _error = "No sites returned. The account may lack Sites.Read.All.";
        }
        catch (Exception ex) { _error = ex.Message; }
        finally { _loading = false; }
    }

    private async Task Toggle(SiteInfo s, bool on)
    {
        if (on)
        {
            if (!IsSelected(s)) SelectedSites.Add(s);
        }
        else
        {
            SelectedSites.RemoveAll(x => string.Equals(x.Url, s.Url, StringComparison.OrdinalIgnoreCase));
        }
        await SelectedSitesChanged.InvokeAsync(SelectedSites);
    }

    private async Task SelectSingle(SiteInfo s)
    {
        SelectedSites = new List<SiteInfo> { s };
        await SelectedSitesChanged.InvokeAsync(SelectedSites);
    }

    private async Task SelectAllFiltered()
    {
        foreach (var s in Filtered)
            if (!IsSelected(s)) SelectedSites.Add(s);
        await SelectedSitesChanged.InvokeAsync(SelectedSites);
    }

    private async Task ClearSelection()
    {
        SelectedSites.Clear();
        await SelectedSitesChanged.InvokeAsync(SelectedSites);
    }
}