namespace NexusReader.UI.Shared.Services;

public interface IReaderNavigationService
{
    Guid CurrentEbookId { get; }
    int CurrentChapterIndex { get; }
    int TotalChapters { get; }
    string ChapterTitle { get; }
    string? PendingScrollBlockId { get; set; }

    event Func<Task>? OnNavigationChanged;

    Task GoToChapter(int index);
    Task GoToNextChapter();
    Task GoToPreviousChapter();
    Task UpdateMetadataAsync(int currentIndex, int totalChapters, string title);

    /// <summary>
    /// Navigates to the reader for a specific book and records the current ebook ID.
    /// </summary>
    void NavigateToBook(Guid bookId);

    /// <summary>
    /// Sets the active book context (ID and optional chapter) without triggering browser routing.
    /// </summary>
    void SetBook(Guid bookId, int chapterIndex = 0);
}