using System;
using System.Collections.Generic;

namespace AcDream.App.UI.Layout;

/// <summary>
/// Shared text shaping for retail indicator detail pages. Retail
/// <c>UIElement_Text::SetText</c> reflows newline-delimited strings into the
/// authored field width; acdream's retained text seam carries already-shaped
/// lines, so controllers perform the equivalent shaping before publication.
/// </summary>
internal static class IndicatorDetailText
{
    public static IReadOnlyList<UiText.Line> Shape(UiText target, string text)
    {
        ArgumentNullException.ThrowIfNull(target);
        text ??= string.Empty;

        float maxWidth = Math.Max(1f, target.Width - (2f * target.Padding));
        float Measure(string value)
            => target.DatFont?.MeasureWidth(value)
               ?? target.Font?.MeasureWidth(value)
               ?? value.Length * 8f;

        var lines = new List<UiText.Line>();
        string normalized = text.Replace("\\n", "\n", StringComparison.Ordinal);
        foreach (string paragraph in normalized.Split('\n'))
        {
            if (paragraph.Length == 0)
            {
                lines.Add(new UiText.Line(string.Empty, target.DefaultColor));
                continue;
            }

            foreach (string line in ChatWindowController.WrapText(paragraph, maxWidth, Measure))
                lines.Add(new UiText.Line(line, target.DefaultColor));
        }
        return lines;
    }
}