using System.Collections.Frozen;
using CounterStrikeSharp.API;
using CounterStrikeSharp.API.Core;
using Outnumbered.Config;
using Outnumbered.Data;
using Outnumbered.Domain;

namespace Outnumbered;

// The single engine site that reads a player into an immutable PlayerSnapshot for the pure Domain math, plus the stat
// registry (_statDefs) the Domain resolvers consume. Everything pure (handicap / combat / progression / stat resolution)
// takes a snapshot + _statDefs and never touches a pawn/controller — so the CS2/CSSharp surface lives only here.
public sealed partial class OutnumberedPlugin
{
    private const int BaseMaxHp = 100;
    private const int BaseMaxArmor = 100;

    // key -> StatDef, rebuilt from Config.Stats on Load + every !og_reload. This is the stat registry the Domain resolvers
    // index (StatResolver/CombatResolver take it) — the key->def view of the named Config.Stats fields (which stay, for JSON
    // back-compat). Projected straight from StatRegistry (Stats.cs), so a new stat is one registry row, not a line here.
    // FrozenDictionary: built once per load/reload, read per-hit (OffenseMultiplier alone does 3+ lookups/hit) — frozen
    // has faster reads than Dictionary. Ordinal matches Dictionary<string,_>'s default, so lookups are bit-identical.
    private FrozenDictionary<string, StatDef> _statDefs = FrozenDictionary<string, StatDef>.Empty;

    private void RebuildStatDefs() =>
        _statDefs = StatRegistry.ToFrozenDictionary(r => r.Key, r => r.Def(Config.Stats), StringComparer.Ordinal);

    // Build the immutable Domain input for one player. `p` is optional: it supplies the live pawn Health (drives the
    // missing-HP fraction for Berserk) — null is fine for paths that don't read Health (XP rate, where t ignores HP).
    // Upgrades + Cards are held by reference, so building a snapshot per hit/tick is allocation-free.
    internal PlayerSnapshot Snapshot(PlayerData pd, CCSPlayerController? p = null)
    {
        var pawn = p?.PlayerPawn.Value;
        double now = Server.CurrentTime; // read once for the 3 ability checks below (can't advance within this build)
        return new PlayerSnapshot
        {
            Level = pd.Level,
            Prestige = pd.Prestige,
            Xp = pd.Xp,
            Kills = pd.Kills,
            Deaths = pd.Deaths,
            HeadshotKills = pd.HeadshotKills,
            Streak = pd.Streak,
            Health = pawn?.Health ?? 0,
            HandicapProgress = _driver?.HandicapProgress(pd) ?? 0.0,
            HandicapFloor = _driver?.HandicapFloor(pd) ?? -1.0,
            TeamDealMult = _driver?.TeamDealMult() ?? 1.0,
            TeamTakeMult = _driver?.TeamTakeMult() ?? 1.0,
            OverchargeActive = AbilityActive(pd, AbOvercharge, now),   // CombatResolver gates these on Abilities.Enabled
            BerserkActive = AbilityActive(pd, AbBerserk, now),
            AdrenalineActive = AbilityActive(pd, AbAdrenaline, now),
            Upgrades = pd.Upgrades,
            Cards = _driver?.CardSource(pd),                       // survival run (IStatBonusSource); null in TDM/GG
        };
    }
}