using DeepDrftPublic.Client.Common;
using Microsoft.JSInterop;

namespace DeepDrftPublic.Client.Services;

/// <summary>
/// Client-side runtime writer for public-site settings (Phase 18 wave 18.6), the analogue of
/// <see cref="DarkModeCookieService"/>. Reads the current preference off the in-memory
/// <see cref="PublicSiteSettings"/> (already seeded at prerender and bridged into WASM), and writes a
/// 365-day cookie via <c>document.cookie</c> interop when the listener changes it in the Settings menu —
/// the same durable-truth seam dark mode uses, so the choice survives the session and seeds the next visit's
/// prerender (no flash).
/// </summary>
public class SettingsCookieService(PublicSiteSettings settings, IJSRuntime js) : SettingsServiceBase
{
    private const int ExpiryDays = 365;

    public StreamQuality GetStreamQuality() => settings.StreamQuality;

    public async ValueTask SetStreamQualityAsync(StreamQuality quality)
    {
        if (settings.StreamQuality == quality) return;

        await WriteCookieAsync(StreamQualityCookieName, FormatStreamQuality(quality));
        settings.StreamQuality = quality;
    }

    private async ValueTask WriteCookieAsync(string name, string value)
    {
        await js.InvokeVoidAsync("DeepDrftSettings.setCookie", name, value, ExpiryDays);
    }
}