using Microsoft.AspNetCore.Components;

namespace DeepDrftPublic.Client.Common;

/// <summary>
/// Environment-gated robots bridge (Phase 22 remediation §4). The beta/staging site is web-hosted and must
/// not be crawled, so the <i>default</i> robots directive is environment-gated: <c>index,follow</c> only in
/// Production, <c>noindex,nofollow</c> everywhere else. A per-page <see cref="SeoModel.Robots"/> override
/// still wins — this only sets the default.
///
/// <para>
/// Crawlers read the server-prerendered HTML, so correctness lives in the server prerender pass — but the
/// value must be identical across the InteractiveAuto double render (AC6), so the WASM pass has to resolve
/// the same flag. The WASM assembly has no <c>IWebHostEnvironment</c> (config comes from the server). This
/// mirrors the DarkMode bridge exactly: a scoped service the server seeds during prerender (from
/// <c>IWebHostEnvironment.IsProduction()</c>) and <c>[PersistentState]</c> rounds to the client, so both
/// passes resolve the identical value. <c>SeoHead</c> injects this rather than an environment dependency,
/// honouring the no-environment-in-the-component constraint.
/// </para>
/// </summary>
public class SeoEnvironment
{
    /// <summary>
    /// True only in Production. Seeded server-side and persisted across the WASM boot. Defaults to
    /// <c>false</c> so the fail-safe is "do not index" — a missing bridge never accidentally opens a
    /// non-production site to crawlers.
    /// </summary>
    [PersistentState]
    public bool IsProduction { get; set; }

    /// <summary>The environment-gated default robots directive. Explicit page values override this.</summary>
    public string DefaultRobots => IsProduction ? "index,follow" : "noindex,nofollow";
}