namespace AcDream.Core.Journal;

/// <summary>
/// One page of retail's per-character journal.
/// </summary>
/// <remarks>
/// Entirely client-authored: no wire, no server, no dat. The player writes it.
/// Retail's own <c>PageInfo</c> (64 bytes, <c>g_JournalPages</c>).
/// </remarks>
/// <param name="Label">Short name, shown in the Page List. Authored max 16 characters.</param>
/// <param name="Title">Page title. Authored max 32.</param>
/// <param name="Notes">Free-form body. Authored max 2048.</param>
/// <param name="TimerDays">Countdown days.</param>
/// <param name="TimerHours">Countdown hours.</param>
/// <param name="TimerMinutes">Countdown minutes.</param>
/// <param name="LocationX">
/// Recorded location, in retail's own north-south / east-west units — what the
/// "Record" button stamps and the page shows as "00.0S, 00.0W".
/// </param>
/// <param name="LocationY">See <paramref name="LocationX"/>.</param>
/// <param name="HasLocation">
/// Whether a location was ever recorded. Distinct from (0, 0), which is a real
/// place.
/// </param>
/// <param name="RunningTimerSeconds">
/// The running countdown's remaining seconds, or 0 when the timer is not
/// running. Retail's <c>&lt;TIME&gt;</c>.
/// </param>
public sealed record JournalPage(
    string Label = "",
    string Title = "",
    string Notes = "",
    int TimerDays = 0,
    int TimerHours = 0,
    int TimerMinutes = 0,
    float LocationX = 0f,
    float LocationY = 0f,
    bool HasLocation = false,
    double RunningTimerSeconds = 0d)
{
    /// <summary>Authored <c>0x1E</c> on the label edit box.</summary>
    public const int MaxLabelLength = 16;

    /// <summary>Authored <c>0x1E</c> on the title edit box.</summary>
    public const int MaxTitleLength = 32;

    /// <summary>Authored <c>0x1E</c> on the notes edit box.</summary>
    public const int MaxNotesLength = 2048;

    /// <summary>An untouched page — what "New" produces.</summary>
    public static readonly JournalPage Empty = new();

    /// <summary>Whether the timer fields describe any duration at all.</summary>
    public bool HasTimer =>
        TimerDays != 0 || TimerHours != 0 || TimerMinutes != 0;

    /// <summary>The timer fields as a single duration.</summary>
    public TimeSpan TimerDuration =>
        new(TimerDays, TimerHours, TimerMinutes, 0);

    /// <summary>Whether a countdown is currently running on this page.</summary>
    public bool IsTimerRunning => RunningTimerSeconds > 0d;

    /// <summary>
    /// The page with every field clipped to its authored maximum. Applied at
    /// the seams that accept outside text — a load from disk, or a paste.
    /// </summary>
    public JournalPage Clipped() => this with
    {
        Label = Clip(Label, MaxLabelLength),
        Title = Clip(Title, MaxTitleLength),
        Notes = Clip(Notes, MaxNotesLength),
    };

    private static string Clip(string value, int max) =>
        value.Length <= max ? value : value[..max];
}