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BlueLaminate/BlueLaminate.Core/SkinLand/SkinLandSlug.cs

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+using System.Text;
+
+namespace BlueLaminate.Core.SkinLand;
+
+/// <summary>
+/// Builds a skin.land market URL from the catalogue's weapon + skin + wear. skin.land's
+/// market routes are <c>/market/csgo/{slug}/</c> where the slug is simply
+/// <c>{weapon}-{skin}-{wear}</c> kebab-cased — verified against the live site (e.g.
+/// "M4A4" + "Global Offensive" + "Battle-Scarred" → <c>m4a4-global-offensive-battle-scarred</c>,
+/// "AK-47" + "Redline" + "Field-Tested" → <c>ak-47-redline-field-tested</c>). No discovery
+/// or stored mapping is needed.
+/// <para>
+/// StatTrak and Souvenir are <em>separate</em> pages on skin.land (<c>stattrak-</c>/
+/// <c>souvenir-</c> prefixed slugs); this builds the base (non-special) page, which is the
+/// unit v1 sweeps per <c>SkinCondition</c>.
+/// </para>
+/// </summary>
+public static class SkinLandSlug
+{
+    private const string MarketBase = "https://skin.land/market/csgo/";
+
+    /// <summary>"M4A4", "Global Offensive", "Battle-Scarred" → the full market URL.</summary>
+    public static string MarketUrl(string weapon, string skinName, string condition) =>
+        $"{MarketBase}{Slugify($"{weapon} {skinName} {condition}")}/";
+
+    /// <summary>
+    /// Lowercase, collapse every run of non-alphanumeric characters to a single hyphen,
+    /// and trim leading/trailing hyphens. So "AK-47 | Redline (Field-Tested)" and the
+    /// catalogue's "AK-47 Redline Field-Tested" both reduce to "ak-47-redline-field-tested".
+    /// </summary>
+    public static string Slugify(string value)
+    {
+        var sb = new StringBuilder(value.Length);
+        var pendingHyphen = false;
+        foreach (var ch in value)
+        {
+            if (char.IsLetterOrDigit(ch))
+            {
+                if (pendingHyphen && sb.Length > 0)
+                {
+                    sb.Append('-');
+                }
+
+                sb.Append(char.ToLowerInvariant(ch));
+                pendingHyphen = false;
+            }
+            else
+            {
+                pendingHyphen = true;
+            }
+        }
+
+        return sb.ToString();
+    }
+}