initial commit

Pages/Guides/Mode.cshtml.cs

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+using System.Text.Json;
+using CsWeb.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace CsWeb.Pages.Guides;
+
+public class ModeModel(Fleet fleet) : PageModel
+{
+    private static readonly string[] Known = ["tdm", "gungame", "survival"];
+
+    public string Mode { get; private set; } = "";
+    public Cached<BalancePayload>? Balance { get; private set; }
+    public BalancePayload? B => Balance?.Data;
+
+    public async Task<IActionResult> OnGetAsync(string mode)
+    {
+        mode = mode.ToLowerInvariant();
+        if (!Known.Contains(mode)) return NotFound();
+        Mode = mode;
+        (_, Balance) = await fleet.BalanceForMode(mode);
+        return Page();
+    }
+
+    // The GG ladder rows from the balance payload's GunGame.Ladder ([{Weapon, Tier}]).
+    public IEnumerable<(string Weapon, int Tier)> Ladder()
+    {
+        if (B is null || B.GunGame.ValueKind != JsonValueKind.Object) yield break;
+        if (!B.GunGame.TryGetProperty("Ladder", out var l) || l.ValueKind != JsonValueKind.Array) yield break;
+        foreach (var e in l.EnumerateArray())
+            yield return (Fmt.StrOf(e, "Weapon"), Fmt.IntOf(e, "Tier"));
+    }
+
+    // Survival card catalog rows ([{Key, Name, PerPick, Cap, Flat?, IsTeam?, Detail?}] — tolerant of shape drift).
+    public IEnumerable<JsonElement> Cards()
+    {
+        if (B is null || B.Survival.ValueKind != JsonValueKind.Object) yield break;
+        if (!B.Survival.TryGetProperty("Cards", out var c) || c.ValueKind != JsonValueKind.Array) yield break;
+        foreach (var e in c.EnumerateArray()) yield return e;
+    }
+}