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;
    }
}