namespace ProjectM.Simulation
{
    /// <summary>
    /// Central home for gameplay-balance constants that were previously buried as <c>private const</c>s
    /// inside individual systems, so designers have one searchable place to tune them. Burst-safe (compile-time
    /// <c>const</c>s only — they inline into the consuming systems with no runtime cost or managed reference).
    /// <para>
    /// Systems reference these via <c>Tuning.*</c> (wired in the 2026-06-04 polish pass, Stage C). When adding a
    /// new tunable value, prefer adding it here over a local private const UNLESS it already has an obvious,
    /// well-named public home (see the cross-references below) — duplicating a literal creates two sources of truth.
    /// </para>
    /// <para>
    /// <b>Values that already live in a clear, public, semantically-named home (NOT duplicated here):</b>
    /// <list type="bullet">
    /// <item><see cref="CyclePhase.ExpeditionTicks"/> / <see cref="CyclePhase.BuildTicks"/> — cycle phase durations.</item>
    /// <item><see cref="RegionMath.ExpeditionOffsetX"/> — base→expedition world-space offset.</item>
    /// <item>Per-ability/character stats — authored in ScriptableObjects, baked to the AbilityDatabase blob (M3).</item>
    /// </list>
    /// </para>
    /// </summary>
    public static class Tuning
    {
        // ---- Ability damage upgrade (AbilityUpgradeSystem) ----

        /// <summary>Distinct sentinel SourceId so the upgrade <c>StatModifier</c> is found + grown in place
        /// (replace-by-SourceId keeps the bounded modifier buffer from growing a row per upgrade).</summary>
        public const uint AbilityUpgradeSourceId = 0x00A0E711u;

        /// <summary>Damage bonus added per upgrade tier (PercentAdd op): +25% per tier.</summary>
        public const float AbilityUpgradeTierStep = 0.25f;

        /// <summary>Aether cost charged to the shared ledger per upgrade tier.</summary>
        public const int AbilityUpgradeCostAmount = 20;

        // ---- Resource harvest (ResourceHarvestSystem) ----

        /// <summary>Effective projectile radius used by the swept-segment node-hit test (added to the node's
        /// <c>HitRadius</c>). Tunnel-safe because the segment is reconstructed from <c>Projectile.LastStep</c>.</summary>
        public const float HarvestProjectileRadius = 0.2f;

        // ---- Enemy knockback (ProjectileDamageSystem stamps on hit; EnemyAISystem applies + suppresses seek/strike) ----

        /// <summary>Knockback speed (world units/sec) a Husk recoils at when shot; 0 disables knockback globally.</summary>
        public const float KnockbackSpeed = 8f;

        /// <summary>Server ticks the knockback lasts (~60 ticks/sec).</summary>
        public const int KnockbackDurationTicks = 8;

        // ---- Husk attack telegraph (EnemyAISystem 2-phase strike; client cue in CombatFeedbackSystem) ----

        /// <summary>Wind-up ticks before a Husk strike lands (~0.37s @ 60 ticks/sec) — sized for a fair tell
        /// under interp lag (>= ~250ms reaction + interp buffer; Slice 1 readability). 0/1 = near-instant (legacy).</summary>
        public const int AttackWindupTicks = 22;

        // ---- Production / automation (M7: Harvester/Conveyor/Fabricator) ----

        /// <summary>Max production cycles a single machine awards in one process (bounds within-session
        /// catch-up after any skipped ticks; restore re-seats the baseline so this never reflects wall-clock).</summary>
        public const int MaxProductionCatchup = 600;

        /// <summary>EB-2: Charge (turret munition) consumed per turret shot, withdrawn from the global ledger. A
        /// turret with 0 Charge SOFT-FAILS (no shot, no cooldown advance). A ledger-fed Fabricator mints Charge from
        /// Ore. Operator feel-fork: keep generous so turrets stay fed while you keep mining.</summary>
        public const int TurretChargeCostPerShot = 1;

        // ---- Cold start (CycleDirectorSpawnSystem seeds the shared ledger on a NEW game) ----

        /// <summary>DR-042 C6c: Ore deposited into the shared ledger at spawn on a NEW game ONLY (a restored save keeps
        /// its persisted ledger). Bootstraps the Fabricator(30)->Charge->Turret(10) chain so a turret placed before any
        /// mining isn't a silent cold deadlock. Ore-only so the 'build a Fabricator to arm turrets' lesson survives.</summary>
        public const int StartingOre = 50;

        // ---- Inventory (per-player bag; InventoryMath / ResourceHarvestSystem / InventoryDepositSystem) ----

        /// <summary>Max stacks a player can carry; InventoryMath rejects deposits past this and the harvest remainder spills to the global ledger.</summary>
        public const int InventoryMaxSlots = 24;

        /// <summary>Default per-slot stack cap when an item has no ItemDatabase entry (the catalog is optional at runtime).</summary>
        public const int DefaultStackMax = 999;

        // ---- Equipment stat-mod SourceIds (EquipSystem) ----
        //   One DISTINCT sentinel per slot: slot i tags its mods with EquipSourceIdBase + i. All of a slot's
        //   inline mods share that one id and are stripped target-agnostically via
        //   TimedModifierUtil.RemoveBySourceId on unequip/swap. Full StatModifier SourceId map (keep DISJOINT):
        //   0u = pickups + debug-injection; 0x00A0E711 = ability-damage upgrade; 0x00DEB061 = debug stat command;
        //   0x00E91000.. = equipment (4 slots); 0x00C1A550.. = class traits (Slice 2, permanent).

        /// <summary>Base for per-slot equipment SourceIds; slot i tags its mods with <c>EquipSourceIdBase + i</c>.</summary>
        public const uint EquipSourceIdBase = 0x00E91000u;

        /// <summary>Slice 2: base SourceId for a class's permanent trait StatModifiers (Warrior/Ranger seeds).
        /// DISJOINT from equipment/upgrade/debug ranges; class traits are NEVER stripped (permanent per session).</summary>
        public const uint ClassSourceId = 0x00C1A550u;
    }
}