using Unity.Collections;
using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// One authored PERMANENT meta upgrade: tiered (buy tier owned+1 up to <see cref="MaxTier"/>), priced in Aether
    /// with a linear ramp (<c>cost(owned) = BaseCost + owned*CostGrowth</c>), class-gated by <see cref="ClassMask"/>
    /// (bit0 = Warrior, bit1 = Ranger — resolve via <see cref="BoonMath.MaskFor"/>, NEVER a raw <c>1&lt;&lt;ClassId</c>:
    /// the stored ClassId is the normalized FrameKind 2/3). <see cref="Id"/> is the stable APPEND-ONLY key
    /// persisted in SaveData v6 and keyed into the live StatModifier as <c>Tuning.MetaSourceIdBase + Id</c>.
    /// DISTINCT from <see cref="BoonDefBlob"/> — boons are run-scoped single-shots; overloading one catalog would
    /// blur the two channels (DR-037). <see cref="PrereqId"/> = 0xFF means no prerequisite (v1 ships a FLAT catalog
    /// — the operator default; trees are an authoring change, not a code change).
    /// </summary>
    public struct MetaUpgradeDefBlob
    {
        public byte Id;
        public byte ClassMask;
        public byte Target;      // StatTarget as byte
        public byte Op;          // ModOp as byte
        public byte MaxTier;
        public float ValuePerTier;
        public int BaseCost;
        public int CostGrowth;
        public byte PrereqId;    // 0xFF = none
        public byte PrereqTier;
        public FixedString64Bytes Name;
        public FixedString128Bytes Desc;
    }

    /// <summary>The baked permanent-upgrade pool (config blob, both worlds, NOT replicated).</summary>
    public struct MetaUpgradeCatalogBlob
    {
        public BlobArray<MetaUpgradeDefBlob> Defs;
    }

    /// <summary>Singleton carrying the baked meta catalog (ONE MetaCatalogAuthoring in the gameplay subscene).</summary>
    public struct MetaUpgradeCatalog : IComponentData
    {
        public BlobAssetReference<MetaUpgradeCatalogBlob> Value;
    }

    /// <summary>Pure helpers over the meta catalog + the director's <see cref="MetaTierState"/> record.</summary>
    public static class MetaMath
    {
        /// <summary>Find a def index by its stable id (-1 when absent — callers preserve-and-skip unknown ids).</summary>
        public static int FindDef(ref MetaUpgradeCatalogBlob pool, byte id)
        {
            for (int i = 0; i < pool.Defs.Length; i++)
                if (pool.Defs[i].Id == id) return i;
            return -1;
        }

        /// <summary>The owned tier of (class, upgrade) in the record buffer (absent row = 0).</summary>
        public static byte TierOf(DynamicBuffer<MetaTierState> record, byte classId, byte upgradeId)
        {
            for (int i = 0; i < record.Length; i++)
                if (record[i].ClassId == classId && record[i].UpgradeId == upgradeId) return record[i].Tier;
            return 0;
        }

        /// <summary>Aether cost of buying tier owned+1 (linear ramp; compute from the CLAMPED owned tier).</summary>
        public static int CostForTier(in MetaUpgradeDefBlob def, byte ownedClamped)
            => def.BaseCost + ownedClamped * def.CostGrowth;
    }

    /// <summary>
    /// The DEFAULT v1 meta table + the blob builder the baker AND EditMode tests share (the BoonCatalogData
    /// pattern; an empty designer-row list on the authoring bakes this verbatim). FLAT catalog — every
    /// PrereqId = 0xFF (operator default: validate the economy before prereq trees). Ids append-only.
    /// Priced for the 15%-Aether node economy (~2-5 Aether per lucky room).
    /// </summary>
    public static class MetaCatalogData
    {
        public static BlobAssetReference<MetaUpgradeCatalogBlob> BuildDefault(Allocator allocator = Allocator.Persistent)
        {
            var builder = new BlobBuilder(Allocator.Temp);
            ref var root = ref builder.ConstructRoot<MetaUpgradeCatalogBlob>();
            var defs = builder.Allocate(ref root.Defs, 8);
            int i = 0;
            // id, mask(1=Warrior,2=Ranger,3=both), target, op, maxTier, valuePerTier, baseCost, growth, name, desc
            defs[i++] = Make(1, 3, StatTarget.MaxHealth, ModOp.Flat, 5, 15f, 10, 5, "Reinforced Frame", "+15 max health per tier");
            defs[i++] = Make(2, 3, StatTarget.Damage, ModOp.PercentAdd, 5, 0.08f, 12, 6, "Sharpened Arsenal", "+8% ability damage per tier");
            defs[i++] = Make(3, 3, StatTarget.CooldownTicks, ModOp.PercentMult, 3, -0.06f, 15, 10, "Swift Recovery", "-6% ability cooldown per tier");
            defs[i++] = Make(4, 3, StatTarget.MoveSpeed, ModOp.PercentAdd, 3, 0.05f, 10, 8, "Fleet Stride", "+5% move speed per tier");
            defs[i++] = Make(5, 1, StatTarget.MeleeDamage, ModOp.PercentAdd, 4, 0.10f, 12, 6, "Warrior's Might", "+10% melee damage per tier");
            defs[i++] = Make(6, 1, StatTarget.MeleeRange, ModOp.PercentAdd, 3, 0.08f, 10, 6, "Warrior's Reach", "+8% melee reach per tier");
            defs[i++] = Make(7, 2, StatTarget.Range, ModOp.PercentAdd, 4, 0.10f, 12, 6, "Ranger's Longshot", "+10% projectile range per tier");
            defs[i++] = Make(8, 2, StatTarget.ProjectileSpeed, ModOp.PercentAdd, 3, 0.10f, 10, 6, "Ranger's Velocity", "+10% projectile speed per tier");
            var blob = builder.CreateBlobAssetReference<MetaUpgradeCatalogBlob>(allocator);
            builder.Dispose();
            return blob;
        }

        static MetaUpgradeDefBlob Make(byte id, byte mask, StatTarget target, ModOp op, byte maxTier,
            float valuePerTier, int baseCost, int growth, string name, string desc)
        {
            return new MetaUpgradeDefBlob
            {
                Id = id,
                ClassMask = mask,
                Target = (byte)target,
                Op = (byte)op,
                MaxTier = maxTier,
                ValuePerTier = valuePerTier,
                BaseCost = baseCost,
                CostGrowth = growth,
                PrereqId = 0xFF,
                PrereqTier = 0,
                Name = new FixedString64Bytes(name),
                Desc = new FixedString128Bytes(desc),
            };
        }
    }
}