import attackCatalog from "./generated/romNativeHolyHealBindings.generated.json";
import nativeDamageProfiles from "./generated/romNativeDamageTrainingProfiles.generated.json";
import nativeStatRules from "./generated/romNativeStatRules.generated.json";
import { romNativeGearReference } from "./romNativeGear";
import type { RomClassId } from "../app/characterCatalog";
import type { RomNativeDerivedStats } from "./romNativeStatsTypes";

export type RomNativeDamageCalculationType = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10;
export type RomNativeDamageWeaponSlot = "main-hand" | "off-hand" | "ranged";

export interface RomNativeAttackComponentDescriptor {
  readonly abilityId: string;
  readonly classId: RomClassId;
  readonly group: string;
  readonly rank: number;
  readonly sourceSkillId: number;
  readonly configuredCollectMagicLevel: number;
  /** Raw MagicCollect value used directly by damage formulas after the source min-one rule. */
  readonly spellTime: number;
  readonly rangeType: number;
  readonly decreaseArg: number;
  readonly isIgnoreDmgEffect: boolean;
  readonly isFixDmgEffect: boolean;
  readonly isShareDamage: boolean;
  readonly componentId: number;
  readonly magicFunc: number;
  readonly magicType: number;
  readonly effectType: number;
  readonly attackType: number;
  readonly calculationType: number;
  readonly damagePower: number;
  readonly damagePowerSkillLevelArg: number;
  readonly fixedValue: number;
  readonly fixedType: number;
  readonly fixedDamageSkillLevelArg: number;
  readonly randomRange: number;
  readonly criticalRate: number;
  readonly ignoreMagicAbsorb: boolean;
}

export interface RomNativeDamageTrainingWeapon {
  readonly slot: RomNativeDamageWeaponSlot;
  readonly sourceItemIds: readonly number[];
  /** Native weapon main/ranged/off-hand damage before class/BodyRate formulas. */
  readonly sourceDamage: number;
  /** Raw source attack speed in tenths, consumed by RoleAttr as its base speed unit. */
  readonly speedTenths: number;
}

export interface RomNativeTrainingWeaponProfile {
  readonly status: "supported";
  readonly classId: RomClassId;
  readonly secondaryClassId: RomClassId | null;
  readonly level: number;
  readonly mainHand: RomNativeDamageTrainingWeapon;
  readonly offHand?: RomNativeDamageTrainingWeapon;
  readonly ranged?: RomNativeDamageTrainingWeapon;
  /** RoleAttr::_DMG-equivalent remainder after removing training weapon DMG from the common sidecar. */
  readonly residualFlatDamage: number;
  readonly expectedGearPhysicalDamage: number;
  readonly expectedGearMagicalDamage: number;
  readonly expectedGearMagicalDamagePoint: number;
  readonly trainingWeaponSlotDamage: number;
  readonly sourceSemantics: "runewaker-training-weapon-profile-bridge";
}

export type RomNativeDamageUnsupportedReason =
  | "training-gear-profile-not-confirmed"
  | "class-pair-outside-active-five"
  | "native-gear-damage-does-not-match-training-profile"
  | "source-weapon-profile-missing"
  | "source-and-native-weapon-damage-disagree"
  | "source-fix-coefficient-missing"
  | "attack-component-not-found"
  | "attack-component-is-not-direct-hp"
  | "attack-calculation-type-unsupported"
  | "fixed-damage-type-unsupported"
  | "training-weapon-profile-unsupported"
  | "runtime-magic-level-invalid"
  | "target-count-invalid"
  | "target-ordinal-invalid"
  | "magic-school-rate-required"
  | "required-training-weapon-missing"
  | "invalid-source-formula-input";

export type RomNativeDamageResult<T> =
  | { readonly status: "supported"; readonly value: T }
  | { readonly status: "unsupported"; readonly reason: RomNativeDamageUnsupportedReason };

interface RawAttackComponent {
  readonly componentId: number;
  readonly magicFunc: number;
  readonly magicType: number;
  readonly effectType: number;
  readonly attackType: number;
  readonly calculationType: number;
  readonly damagePower: number;
  readonly damagePowerSkillLevelArg: number;
  readonly fixedValue: number;
  readonly fixedType: number;
  readonly fixedDamageSkillLevelArg: number;
  readonly randomRange: number;
  readonly criticalRate: number;
  readonly ignoreMagicAbsorb: boolean;
}

interface RawAttackRank {
  readonly rank: number | null;
  readonly sourceSkillId: number;
  readonly configuredCollectMagicLevel: number;
  readonly spellTimeSeconds: number;
  readonly rangeType: number;
  readonly decreaseArg: number;
  readonly isIgnoreDmgEffect: boolean;
  readonly isFixDmgEffect: boolean;
  readonly isShareDamage: boolean;
  readonly componentIds: readonly RawAttackComponent[];
}

interface RawAttackBinding {
  readonly abilityId: string;
  readonly classId: RomClassId;
  readonly group: string;
  readonly ranks: readonly RawAttackRank[];
}

interface RawWeaponProfileRow {
  readonly level: number;
  readonly sourceItemIds: readonly number[];
  readonly weaponDamage: number;
  readonly magicalWeaponDamage: number;
  readonly speedTenths: number | null;
  readonly shieldDefense?: number;
}

type RawDamageProfileCatalog = {
  readonly profiles: Readonly<Record<string, Readonly<Record<string, readonly RawWeaponProfileRow[]>>>>;
};

type RawStatRules = {
  readonly classRows: Readonly<Record<string, { readonly args: { readonly damageRate: number } }>>;
  readonly playerFix: {
    readonly secondHandDamageCoefficient: number;
    readonly magicDamageCoefficient: number;
    readonly magicMagicalDamageCoefficient: number;
  };
};

const attackBindings = (attackCatalog as unknown as { readonly attackBindings: readonly RawAttackBinding[] }).attackBindings;
const damageProfiles = nativeDamageProfiles as unknown as RawDamageProfileCatalog;
/** Raw BaseEQ.Def[Shield] curve; excludes fixed WearEqType_DEF enchantments. */
export function romNativeTrainingShieldDefense(classId: string, level: number): number | undefined {
  return damageProfiles.profiles[classId]?.["off-hand"]?.[Math.min(79, Math.max(1, Math.trunc(level))) - 1]?.shieldDefense;
}
const statRules = nativeStatRules as unknown as RawStatRules;
const CLASS_PAIRS: Readonly<Record<string, readonly string[]>> = Object.freeze({
  "rom-knight": ["rom-scout"],
  "rom-priest": ["rom-knight"],
  "rom-rogue": ["rom-warrior"],
  "rom-scout": ["rom-rogue"],
  "rom-mage": ["rom-warlock"],
});
function finite(value: unknown): value is number {
  return typeof value === "number" && Number.isFinite(value);
}

function near(left: number, right: number): boolean {
  return Math.abs(left - right) <= 1e-5;
}

function weaponRow(classId: RomClassId, slot: RomNativeDamageWeaponSlot, level: number): RawWeaponProfileRow | undefined {
  const curve = damageProfiles.profiles[classId]?.[slot];
  return curve?.[Math.max(0, Math.min(78, Math.trunc(level) - 1))];
}

function isTrainingWeaponActive(
  classId: RomClassId,
  secondaryClassId: RomClassId | null,
  slot: RomNativeDamageWeaponSlot,
  level: number,
): boolean {
  if (slot === "main-hand") return true;
  if (slot === "off-hand") {
    return (classId === "rom-rogue" && level >= 16)
      || (classId === "rom-scout" && secondaryClassId === "rom-rogue" && level >= 16);
  }
  if (slot === "ranged") {
    return classId === "rom-scout"
      || (classId === "rom-knight" && secondaryClassId === "rom-scout" && level >= 10)
      || (classId === "rom-rogue" && level >= 12);
  }
  return false;
}

function expectedGearDamage(classId: RomClassId, secondaryClassId: RomClassId | null, level: number): {
  readonly physicalDamage: number;
  readonly magicalDamage: number;
  readonly magicalDamagePoint: number;
} {
  const catalogClass = damageProfiles.profiles[classId];
  if (!catalogClass) return { physicalDamage: Number.NaN, magicalDamage: Number.NaN, magicalDamagePoint: Number.NaN };
  const total = { physicalDamage: 0, magicalDamage: 0, magicalDamagePoint: 0 };
  for (const slot of Object.keys(catalogClass)) {
    if ((slot === "off-hand" || slot === "ranged")
      && !isTrainingWeaponActive(classId, secondaryClassId, slot as RomNativeDamageWeaponSlot, level)) continue;
    const gear = romNativeGearReference(classId, slot as Parameters<typeof romNativeGearReference>[1], level);
    total.physicalDamage += gear?.physicalDamage ?? 0;
    total.magicalDamage += gear?.magicalDamage ?? 0;
    total.magicalDamagePoint += gear?.magicalDamagePoint ?? 0;
  }
  return total;
}

function resolveWeapon(
  classId: RomClassId,
  secondaryClassId: RomClassId | null,
  slot: RomNativeDamageWeaponSlot,
  level: number,
): RomNativeDamageResult<RomNativeDamageTrainingWeapon | undefined> {
  if (!isTrainingWeaponActive(classId, secondaryClassId, slot, level)) return { status: "supported", value: undefined };
  const row = weaponRow(classId, slot, level);
  const native = romNativeGearReference(classId, slot, level);
  if (!row || !native || row.speedTenths === null || row.weaponDamage <= 0) {
    return slot === "main-hand"
      ? { status: "unsupported", reason: "source-weapon-profile-missing" }
      : { status: "supported", value: undefined };
  }
  if (!near(row.weaponDamage, native.physicalDamage ?? 0)) {
    return { status: "unsupported", reason: "source-and-native-weapon-damage-disagree" };
  }
  return {
    status: "supported",
    value: Object.freeze({
      slot,
      sourceItemIds: row.sourceItemIds,
      sourceDamage: row.weaponDamage,
      speedTenths: row.speedTenths,
    }),
  };
}

/**
 * Reverses the RoM training-weapon stat bridge for the five explicit active class pairs.
 * The caller must first compare the complete native gear payload with automatic training gear;
 * source gear stats contain no item provenance or weapon speed. This function also checks the
 * aggregate type-25 DMG channel against the compact native training curve. Custom/unverified
 * equipment must pass `trainingGearProfileMatches: false` and remains unsupported.
 */
export function resolveRomNativeTrainingWeaponProfile(
  stats: RomNativeDerivedStats,
  evidence: { readonly trainingGearProfileMatches: boolean },
): RomNativeDamageResult<RomNativeTrainingWeaponProfile> {
  if (!evidence.trainingGearProfileMatches) {
    return { status: "unsupported", reason: "training-gear-profile-not-confirmed" };
  }
  const classId = stats.sourceInputs.classId;
  const secondaryClassId = stats.sourceInputs.secondaryClassId;
  const level = Math.max(1, Math.min(80, Math.trunc(stats.sourceInputs.level)));
  const primaryOnlyBeforeSecondaryUnlock = secondaryClassId === null && level < 10 && CLASS_PAIRS[classId] !== undefined;
  if (!primaryOnlyBeforeSecondaryUnlock && (!secondaryClassId || !CLASS_PAIRS[classId]?.includes(secondaryClassId))) {
    return { status: "unsupported", reason: "class-pair-outside-active-five" };
  }
  const expectedGear = expectedGearDamage(classId, secondaryClassId, level);
  if (!Object.values(expectedGear).every(finite)
    || !near(stats.sourceInputs.gear.physicalDamage ?? 0, expectedGear.physicalDamage)
    || !near(stats.sourceInputs.gear.magicalDamage ?? 0, expectedGear.magicalDamage)
    || !near(stats.sourceInputs.gear.magicalDamagePoint ?? 0, expectedGear.magicalDamagePoint)) {
    return { status: "unsupported", reason: "native-gear-damage-does-not-match-training-profile" };
  }

  const main = resolveWeapon(classId, secondaryClassId, "main-hand", level);
  const off = resolveWeapon(classId, secondaryClassId, "off-hand", level);
  const ranged = resolveWeapon(classId, secondaryClassId, "ranged", level);
  for (const result of [main, off, ranged]) if (result.status === "unsupported") return result;
  if (main.status !== "supported" || !main.value) {
    return { status: "unsupported", reason: "source-weapon-profile-missing" };
  }
  const weapons = [main.value, ...(off.status === "supported" && off.value ? [off.value] : []), ...(ranged.status === "supported" && ranged.value ? [ranged.value] : [])];
  const trainingWeaponSlotDamage = weapons.reduce((sum, weapon) => sum + weapon.sourceDamage, 0);
  const classDamageRate = statRules.classRows[classId]?.args.damageRate;
  if (!finite(classDamageRate)) return { status: "unsupported", reason: "source-fix-coefficient-missing" };
  const residualFlatDamage = Math.max(0,
    stats.physicalDamage - trainingWeaponSlotDamage * classDamageRate * stats.rateFactors.physicalDamage);

  return {
    status: "supported",
    value: Object.freeze({
      status: "supported",
      classId,
      secondaryClassId,
      level,
      mainHand: main.value,
      ...(off.status === "supported" && off.value ? { offHand: off.value } : {}),
      ...(ranged.status === "supported" && ranged.value ? { ranged: ranged.value } : {}),
      residualFlatDamage,
      expectedGearPhysicalDamage: expectedGear.physicalDamage,
      expectedGearMagicalDamage: expectedGear.magicalDamage,
      expectedGearMagicalDamagePoint: expectedGear.magicalDamagePoint,
      trainingWeaponSlotDamage,
      sourceSemantics: "runewaker-training-weapon-profile-bridge",
    }),
  };
}

export function findRomNativeAttackComponent(input: {
  readonly abilityId: string;
  readonly sourceSkillId: number;
  readonly rank: number;
  readonly componentId: number;
}): RomNativeDamageResult<RomNativeAttackComponentDescriptor> {
  const ability = attackBindings.find((candidate) => candidate.abilityId === input.abilityId);
  const rank = ability?.ranks.find((candidate) => candidate.sourceSkillId === input.sourceSkillId && candidate.rank === input.rank);
  const component = rank?.componentIds.find((candidate) => candidate.componentId === input.componentId);
  if (!ability || !rank || !component) return { status: "unsupported", reason: "attack-component-not-found" };
  return {
    status: "supported",
    value: Object.freeze({
      abilityId: ability.abilityId,
      classId: ability.classId,
      group: ability.group,
      rank: input.rank,
      sourceSkillId: rank.sourceSkillId,
      configuredCollectMagicLevel: rank.configuredCollectMagicLevel,
      spellTime: rank.spellTimeSeconds,
      rangeType: rank.rangeType,
      decreaseArg: rank.decreaseArg,
      isIgnoreDmgEffect: rank.isIgnoreDmgEffect,
      isFixDmgEffect: rank.isFixDmgEffect,
      isShareDamage: rank.isShareDamage,
      componentId: component.componentId,
      magicFunc: component.magicFunc,
      magicType: component.magicType,
      effectType: component.effectType,
      attackType: component.attackType,
      calculationType: component.calculationType,
      damagePower: component.damagePower,
      damagePowerSkillLevelArg: component.damagePowerSkillLevelArg,
      fixedValue: component.fixedValue,
      fixedType: component.fixedType,
      fixedDamageSkillLevelArg: component.fixedDamageSkillLevelArg,
      randomRange: component.randomRange,
      criticalRate: component.criticalRate,
      ignoreMagicAbsorb: component.ignoreMagicAbsorb,
    }),
  };
}

export interface RomNativeDamageCalculation {
  readonly abilityId: string;
  readonly sourceSkillId: number;
  readonly rank: number;
  readonly componentId: number;
  readonly calculationType: number;
  readonly ownerKind: "player" | "npc";
  readonly magicLevel: number;
  /** Signed source power formula before the downstream Attack.FixValue contribution. */
  readonly sourcePower: number;
  /** Attack.FixValue * GetValue(Attack.FixType) * (1 + MagicLv * FixDmg_SkillLVArg / 100). */
  readonly sourceFixedContribution: number;
  /** Positive magnitude after the source target-count/decrease factor, before target resolution. */
  readonly damageBeforeTargetResolver: number;
  readonly targetPowerMultiplier: number;
  readonly rangePowerMultiplier: number;
  readonly ignoreMagicAbsorb: boolean;
  readonly sourceRandomRange: number;
  readonly sourceCriticalRate: number;
  readonly magicType: number;
  readonly sourceSemantics: "runewaker-magicprocess-direct-hp-outgoing-power";
}

export interface RomNativeAutoAttackProfile {
  readonly slot: RomNativeDamageWeaponSlot;
  readonly sourceDamageChannel: "Main_DMG" | "Sec_DMG" | "Bow_DMG";
  /** RoleAttr-derived weapon damage input before MainAtkDamage target/armor/random resolution. */
  readonly damage: number;
  readonly attackSpeed: number;
  /** Runewaker attack-speed source units are converted by MagicProcess scheduling at ×100 ms. */
  readonly intervalMs: number;
  readonly physicalAttack: number;
  readonly sourceItemIds: readonly number[];
  readonly sourceSemantics: "runewaker-roleattr-auto-weapon-channel";
}

export interface RomNativeWeaponRates {
  /** Known weapon-type/all-weapon multiplier beyond the native DMG_Per BodyRate. */
  readonly mainDamage?: number;
  readonly offHandDamage?: number;
  readonly rangedDamage?: number;
  readonly mainAttackSpeed?: number;
  readonly offHandAttackSpeed?: number;
  readonly rangedAttackSpeed?: number;
}

/** Exact native channels; prior-hit values are signed source HP deltas. */
export interface RomNativeSpecialDamageInputs {
  readonly throwDamage?: number;
  readonly lastSkillHitPoint?: number;
  readonly lastPhysicalHitPoint?: number;
  /** Raw BaseEQ.Def[EM_Armor_Shield], before BodyRate or aggregate DEF. */
  readonly shieldDefense?: number;
}

function profileMatchesStats(stats: RomNativeDerivedStats, profile: RomNativeTrainingWeaponProfile): boolean {
  return profile.status === "supported"
    && profile.classId === stats.sourceInputs.classId
    && profile.secondaryClassId === stats.sourceInputs.secondaryClassId
    && profile.level === stats.sourceInputs.level;
}

/**
 * Resolves the Runewaker outgoing Main_DMG, Sec_DMG, or Bow_DMG channel and attack interval.
 * This is not the completed auto-hit formula: MainAtkDamage/SecAtkDamage still apply source
 * weapon variance, target armor absorption, and the attacker-vs-target ATK/DEF ratio.
 */
export function resolveRomNativeAutoAttackProfile(input: {
  readonly stats: RomNativeDerivedStats;
  readonly trainingWeapons: RomNativeTrainingWeaponProfile;
  readonly slot: RomNativeDamageWeaponSlot;
  readonly weaponRates?: RomNativeWeaponRates;
}): RomNativeDamageResult<RomNativeAutoAttackProfile> {
  const { stats, trainingWeapons, slot } = input;
  if (!profileMatchesStats(stats, trainingWeapons)) return { status: "unsupported", reason: "training-weapon-profile-unsupported" };
  const weapon = slot === "main-hand" ? trainingWeapons.mainHand
    : slot === "off-hand" ? trainingWeapons.offHand
      : trainingWeapons.ranged;
  if (!weapon) return { status: "unsupported", reason: "required-training-weapon-missing" };
  const rate = slot === "main-hand" ? input.weaponRates?.mainDamage ?? 1
    : slot === "off-hand" ? input.weaponRates?.offHandDamage ?? 1
      : input.weaponRates?.rangedDamage ?? 1;
  const speedRate = slot === "main-hand" ? input.weaponRates?.mainAttackSpeed ?? 1
    : slot === "off-hand" ? input.weaponRates?.offHandAttackSpeed ?? 1
      : input.weaponRates?.rangedAttackSpeed ?? 1;
  if (![rate, speedRate].every(finite) || rate < 0 || speedRate < 0) {
    return { status: "unsupported", reason: "invalid-source-formula-input" };
  }
  let damage: number;
  let attackSpeed: number;
  let sourceDamageChannel: RomNativeAutoAttackProfile["sourceDamageChannel"];
  if (slot === "main-hand") {
    damage = Math.max(1,
      (trainingWeapons.residualFlatDamage + weapon.sourceDamage) * stats.rateFactors.physicalDamage * rate);
    attackSpeed = Math.max(5, weapon.speedTenths * speedRate);
    sourceDamageChannel = "Main_DMG";
  } else if (slot === "off-hand") {
    damage = Math.max(0,
      (trainingWeapons.residualFlatDamage + weapon.sourceDamage)
      * stats.rateFactors.physicalDamage * statRules.playerFix.secondHandDamageCoefficient * rate);
    attackSpeed = Math.max(5, weapon.speedTenths * speedRate);
    sourceDamageChannel = "Sec_DMG";
  } else {
    damage = Math.max(0,
      trainingWeapons.residualFlatDamage + weapon.sourceDamage * stats.rateFactors.physicalDamage * rate);
    attackSpeed = weapon.speedTenths * speedRate;
    if (attackSpeed <= 0) return { status: "unsupported", reason: "invalid-source-formula-input" };
    sourceDamageChannel = "Bow_DMG";
  }
  return {
    status: "supported",
    value: Object.freeze({
      slot,
      sourceDamageChannel,
      damage,
      attackSpeed,
      intervalMs: attackSpeed * 100,
      physicalAttack: stats.physicalAttack,
      sourceItemIds: weapon.sourceItemIds,
      sourceSemantics: "runewaker-roleattr-auto-weapon-channel",
    }),
  };
}

/**
 * Resolves MagicAttackCalENUM's verified GetValue overload. Special channels
 * require explicit source inputs; aggregate DEF and unsigned damage are invalid substitutes.
 */
function resolveFixedDamageStat(input: {
  readonly stats: RomNativeDerivedStats;
  readonly trainingWeapons: RomNativeTrainingWeaponProfile;
  readonly component: RomNativeAttackComponentDescriptor;
  readonly weaponRates?: RomNativeWeaponRates;
  readonly specialInputs?: RomNativeSpecialDamageInputs;
}): RomNativeDamageResult<number> {
  switch (input.component.fixedType) {
    case 0: // EM_MagicAttackCal_None
      return { status: "supported", value: 1 };
    case 1: // EM_MagicAttackCal_MPow
      return { status: "supported", value: input.stats.magicPowerRate };
    case 2: { // EM_MagicAttackCal_Weapon
      const profile = resolveRomNativeAutoAttackProfile({
        stats: input.stats, trainingWeapons: input.trainingWeapons, slot: "main-hand", weaponRates: input.weaponRates,
      });
      return profile.status === "supported" ? { status: "supported", value: profile.value.damage } : profile;
    }
    case 3: { // EM_MagicAttackCal_Shoot
      const profile = resolveRomNativeAutoAttackProfile({
        stats: input.stats, trainingWeapons: input.trainingWeapons, slot: "ranged", weaponRates: input.weaponRates,
      });
      return profile.status === "supported" ? { status: "supported", value: profile.value.damage } : profile;
    }
    case 4:
    case 10:
    case 11:
    case 12: {
      const value = input.component.fixedType === 4 ? input.specialInputs?.throwDamage
        : input.component.fixedType === 10 ? input.specialInputs?.lastSkillHitPoint
          : input.component.fixedType === 11 ? input.specialInputs?.lastPhysicalHitPoint
            : input.specialInputs?.shieldDefense;
      return value !== undefined && finite(value)
        ? { status: "supported", value }
        : { status: "unsupported", reason: "fixed-damage-type-unsupported" };
    }
    case 5: // EM_MagicAttackCal_INT
      return { status: "supported", value: input.stats.attributes.intellect };
    case 6: // EM_MagicAttackCal_STR
      return { status: "supported", value: input.stats.attributes.strength };
    case 7: // EM_MagicAttackCal_AGI
      return { status: "supported", value: input.stats.attributes.agility };
    case 8: // EM_MagicAttackCal_STA
      return { status: "supported", value: input.stats.attributes.stamina };
    case 9: // EM_MagicAttackCal_MND
      return { status: "supported", value: input.stats.attributes.wisdom };
    default:
      return { status: "unsupported", reason: "fixed-damage-type-unsupported" };
  }
}

function targetPowerMultiplier(component: RomNativeAttackComponentDescriptor, targetCount: number, targetOrdinal: number): number {
  if (component.isShareDamage) return Math.max(component.decreaseArg / 100, 1 / targetCount);
  return Math.pow(1 - component.decreaseArg / 100, targetOrdinal);
}

/**
 * Source-backed MagicProcess outgoing-power branches used by the five RoM training pairs.
 * Typed Attack.FixType additions supported by the audited RoleData overload are included; an
 * unported nonzero type returns an explicit unsupported result. This deliberately stops before
 * target armor/MDEF, hit, crit, variance, and auras owned by another resolver. Callers must bypass
 * common gear scaling and apply the returned target power exactly once in their target resolver.
 */
export function calculateRomNativeDamagePower(input: {
  readonly stats: RomNativeDerivedStats;
  readonly trainingWeapons: RomNativeTrainingWeaponProfile;
  readonly component: RomNativeAttackComponentDescriptor;
  /** Runtime MagicProc.MagicLv. Never inferred from unlock level or catalog rank. */
  readonly magicLevel: number;
  readonly ownerKind: "player" | "npc";
  readonly magicSchoolRate?: number;
  readonly targetCount?: number;
  readonly targetOrdinal?: number;
  readonly weaponRates?: RomNativeWeaponRates;
  readonly specialInputs?: RomNativeSpecialDamageInputs;
}): RomNativeDamageResult<RomNativeDamageCalculation> {
  const { stats, component, trainingWeapons } = input;
  if (!profileMatchesStats(stats, trainingWeapons)) return { status: "unsupported", reason: "training-weapon-profile-unsupported" };
  if (!finite(input.magicLevel) || input.magicLevel < 0) return { status: "unsupported", reason: "runtime-magic-level-invalid" };
  if (component.magicFunc !== 0 || component.attackType !== 0 || component.damagePower >= 0) {
    return { status: "unsupported", reason: "attack-component-is-not-direct-hp" };
  }
  if (![0, 1, 3, 9].includes(component.calculationType)) {
    return { status: "unsupported", reason: "attack-calculation-type-unsupported" };
  }
  const magicLevel = input.magicLevel;
  const targetCount = input.targetCount ?? 1;
  const targetOrdinal = input.targetOrdinal ?? 0;
  if (!Number.isInteger(targetCount) || targetCount < 1) return { status: "unsupported", reason: "target-count-invalid" };
  if (!Number.isInteger(targetOrdinal) || targetOrdinal < 0 || targetOrdinal >= targetCount) {
    return { status: "unsupported", reason: "target-ordinal-invalid" };
  }
  const fix = statRules.playerFix;
  const powerRate = component.rangeType === 0 ? 1 : 0.6;
  const spellTime = component.isFixDmgEffect || component.spellTime < 1 ? 1 : component.spellTime;
  const orgPower = component.damagePower
    + component.damagePower * component.damagePowerSkillLevelArg * magicLevel / 100;
  const mainDamageRate = input.weaponRates?.mainDamage ?? 1;
  const rangedDamageRate = input.weaponRates?.rangedDamage ?? 1;
  const mainAttackSpeedRate = input.weaponRates?.mainAttackSpeed ?? 1;
  const rangedAttackSpeedRate = input.weaponRates?.rangedAttackSpeed ?? 1;
  if (![powerRate, spellTime, orgPower, mainDamageRate, rangedDamageRate, mainAttackSpeedRate, rangedAttackSpeedRate].every(finite)) {
    return { status: "unsupported", reason: "invalid-source-formula-input" };
  }

  let purePower: number;
  let rangePowerMultiplier = 1;
  if (component.calculationType === 0 || component.calculationType === 9) {
    const mainDamage = Math.max(1,
      (trainingWeapons.residualFlatDamage + trainingWeapons.mainHand.sourceDamage)
      * stats.rateFactors.physicalDamage * mainDamageRate);
    if (component.calculationType === 0) {
      const mainAttackSpeed = Math.max(5, trainingWeapons.mainHand.speedTenths * mainAttackSpeedRate);
      const dps = mainDamage * 10 * spellTime / mainAttackSpeed;
      purePower = component.isIgnoreDmgEffect ? orgPower : orgPower * dps;
      if (purePower < 0) purePower -= dps * fix.magicDamageCoefficient * powerRate;
    } else {
      purePower = orgPower;
      if (purePower < 0 && !component.isIgnoreDmgEffect) {
        const spellMultiplier = component.isFixDmgEffect ? 1 : spellTime;
        purePower -= mainDamage * fix.magicDamageCoefficient * powerRate * spellMultiplier;
      }
    }
    if (purePower < 0 && component.calculationType !== 0 && component.isIgnoreDmgEffect) {
      // Physics_Point's source ignore flag removes its Main_DMG additive branch entirely.
    }
    if (purePower < 0 && component.calculationType === 0 && component.effectType === 0) {
      const schoolRate = resolveMagicSchoolRate(stats.magicPowerRate, component.magicType, input.magicSchoolRate);
      if (schoolRate === null) return { status: "unsupported", reason: "magic-school-rate-required" };
      purePower *= schoolRate;
    }
    if (purePower < 0 && component.calculationType === 9 && component.effectType === 0) {
      const schoolRate = resolveMagicSchoolRate(stats.magicPowerRate, component.magicType, input.magicSchoolRate);
      if (schoolRate === null) return { status: "unsupported", reason: "magic-school-rate-required" };
      purePower *= schoolRate;
    }
  } else if (component.calculationType === 1) {
    const schoolRate = resolveMagicSchoolRate(stats.magicPowerRate, component.magicType, input.magicSchoolRate);
    if (schoolRate === null) return { status: "unsupported", reason: "magic-school-rate-required" };
    const exRate = input.ownerKind === "player" ? 0.6 + Math.abs(magicLevel) * 0.01 : 1;
    purePower = orgPower;
    if (purePower < 0 && !component.isIgnoreDmgEffect) {
      const spellMultiplier = component.isFixDmgEffect ? 1 : spellTime;
      purePower -= exRate * stats.magicalDamage * fix.magicMagicalDamageCoefficient * powerRate * spellMultiplier;
    }
    purePower *= schoolRate;
    if (orgPower < 0) {
      purePower -= stats.magicalDamagePoint;
      if (purePower > -1) purePower = -1;
    }
  } else {
    const ranged = trainingWeapons.ranged;
    if (!ranged) return { status: "unsupported", reason: "required-training-weapon-missing" };
    const rangedDamage = Math.max(0,
      trainingWeapons.residualFlatDamage + ranged.sourceDamage * stats.rateFactors.physicalDamage * rangedDamageRate);
    const rangedAttackSpeed = Math.max(5, ranged.speedTenths * rangedAttackSpeedRate);
    purePower = orgPower * (rangedDamage * 10 / rangedAttackSpeed);
    if (purePower < 0) purePower -= rangedDamage * fix.magicDamageCoefficient * powerRate;
  }

  if (!finite(purePower)) return { status: "unsupported", reason: "invalid-source-formula-input" };
  let sourceFixedContribution = 0;
  if (component.fixedValue !== 0) {
    const fixedStat = resolveFixedDamageStat({
      stats, trainingWeapons, component, weaponRates: input.weaponRates, specialInputs: input.specialInputs,
    });
    if (fixedStat.status !== "supported") return fixedStat;
    sourceFixedContribution = component.fixedValue * fixedStat.value
      * (1 + magicLevel * component.fixedDamageSkillLevelArg / 100);
  }
  if (!finite(sourceFixedContribution)) return { status: "unsupported", reason: "invalid-source-formula-input" };
  const targetMultiplier = targetPowerMultiplier(component, targetCount, targetOrdinal);
  rangePowerMultiplier = powerRate;
  // For non-shared targets MagicProcess attenuates PurePower in its target loop,
  // then CalPhyDamage/CalMagicDamage adds the typed fixed term per target. Shared
  // damage passes FinFixPowerRate into that later target resolver, scaling both.
  const signedPower = component.isShareDamage
    ? (purePower + sourceFixedContribution) * targetMultiplier
    : purePower * targetMultiplier + sourceFixedContribution;
  return {
    status: "supported",
    value: Object.freeze({
      abilityId: component.abilityId,
      sourceSkillId: component.sourceSkillId,
      rank: component.rank,
      componentId: component.componentId,
      calculationType: component.calculationType,
      ownerKind: input.ownerKind,
      magicLevel,
      sourcePower: purePower,
      sourceFixedContribution,
      damageBeforeTargetResolver: Math.max(0, -signedPower),
      targetPowerMultiplier: targetMultiplier,
      rangePowerMultiplier,
      ignoreMagicAbsorb: component.ignoreMagicAbsorb,
      sourceRandomRange: component.randomRange,
      sourceCriticalRate: component.criticalRate,
      magicType: component.magicType,
      sourceSemantics: "runewaker-magicprocess-direct-hp-outgoing-power",
    }),
  };
}

function resolveMagicSchoolRate(baseMagicPowerRate: number, magicType: number, schoolRate?: number): number | null {
  if (magicType >= 0 && magicType <= 5) {
    return finite(schoolRate) ? baseMagicPowerRate * schoolRate : null;
  }
  return baseMagicPowerRate;
}

/** Source FIX rows are retained for targeted formula tests and callers that need exact raw coefficients. */
export function getRomNativeDamageFixCoefficients(): {
  readonly secondHandDamage: number;
  readonly physicalMagicPowerCoefficient: number;
  readonly magicalMagicPowerCoefficient: number;
} | null {
  const fix = statRules.playerFix;
  if (![fix.secondHandDamageCoefficient, fix.magicDamageCoefficient, fix.magicMagicalDamageCoefficient].every(finite)) return null;
  return Object.freeze({
    secondHandDamage: fix.secondHandDamageCoefficient,
    physicalMagicPowerCoefficient: fix.magicDamageCoefficient,
    magicalMagicPowerCoefficient: fix.magicMagicalDamageCoefficient,
  });
}