import type { AbilityDefinition } from "./abilityCatalog";
import type { AuraDefinition, DamageSchool } from "./combatAuras";

export const WOW335_WARLOCK_METAMORPHOSIS_AURA_TAG = "wow335-warlock-metamorphosis";
export const WOW335_WARLOCK_METAMORPHOSIS_FORM_ID = 22;
export const WOW335_WARLOCK_METAMORPHOSIS_IMMOLATION_TAG = "wow335-warlock-immolation-aura";
export const WOW335_WARLOCK_METAMORPHOSIS_IMMOLATION_AP_AURA_TAG = "wow335-warlock-immolation-ap";
export const WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS = Object.freeze([
  "wow335-warlock-shadow-cleave",
  "wow335-warlock-challenging-howl",
  "wow335-warlock-demon-charge",
  "wow335-warlock-immolation-aura",
] as const);

export interface WarlockMetamorphosisEffects {
  readonly rank: 1;
  readonly durationMs: 30_000;
  readonly cooldownMs: 180_000;
  readonly armorContributionPercent: 130;
  readonly damagePercent: 15;
  readonly meleeCritChanceTakenReductionPercent: 6;
  readonly stunSnareDurationReductionPercent: 25;
  readonly allowedSchools: readonly ["fire", "shadow"];
  /** PvP-only modifier is sourced but has no player-target model here. */
  readonly pvpDamageBonusPercent: null;
}

/**
 * Values come from the generated local Metamorphosis talent-1886 row and its
 * source spells 47241, 54817, and 54879 in the local 3.3.5a talent DBC.
 * The PvP-only +10% damage tooltip rider is omitted because this runtime has
 * no PvP player-target model.
 */
export function wow335WarlockMetamorphosisEffectsForRank(rank: number): WarlockMetamorphosisEffects | null {
  if (!Number.isFinite(rank) || Math.trunc(rank) < 1) return null;
  return {
    rank: 1,
    durationMs: 30_000,
    cooldownMs: 180_000,
    armorContributionPercent: 130,
    damagePercent: 15,
    meleeCritChanceTakenReductionPercent: 6,
    stunSnareDurationReductionPercent: 25,
    allowedSchools: ["fire", "shadow"],
    pvpDamageBonusPercent: null,
  };
}

export interface WarlockMetamorphosisAbilityContext {
  readonly school?: DamageSchool;
  readonly schools?: readonly DamageSchool[];
  /** Explicit local metadata for spells that are allowed during shapeshift. */
  readonly usableWhileShapeshifted?: boolean;
}

/** The local Metamorphosis description permits Fire/Shadow or shapeshift-safe spells. */
export function warlockMetamorphosisAbilityEligible(
  isMetamorphosisActive: boolean,
  ability: WarlockMetamorphosisAbilityContext,
): boolean {
  const schools = [ability.school, ...(ability.schools ?? [])];
  return !isMetamorphosisActive
    || ability.usableWhileShapeshifted === true
    || schools.some((school) => school === "fire" || school === "shadow");
}

/** Gate based only on explicit spell schools or explicit shapeshift-safe text. */
export function warlockMetamorphosisCanCastAbilityWhileActive(
  ability: Pick<AbilityDefinition, "id" | "description" | "effects" | "castRules">,
): boolean {
  if ((WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS as readonly string[]).includes(ability.id)) return true;
  const schools: DamageSchool[] = ability.effects.flatMap((effect) => (
    (effect.kind === "damage" || effect.kind === "dot") && effect.school ? [effect.school] : []
  ));
  if (ability.castRules?.school) schools.push(ability.castRules.school);
  if (!schools.length && ability.effects.some((effect) => effect.kind === "damage" || effect.kind === "dot")) {
    const text = ability.description.toLowerCase();
    if (/\bshadow\s+(?:damage|spell|magic)\b/.test(text)) schools.push("shadow");
    else if (/\bfire\s+(?:damage|spell|magic)\b/.test(text)) schools.push("fire");
  }
  return warlockMetamorphosisAbilityEligible(true, {
    schools,
    usableWhileShapeshifted: /\busable while shapeshifted\b/i.test(ability.description),
  });
}

export function warlockMetamorphosisFormActionReady(abilityId: string, isFormActive: boolean): boolean {
  return !(WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS as readonly string[]).includes(abilityId)
    || isFormActive;
}

export function wow335WarlockMetamorphosisControlDuration(
  durationMs: number,
  mechanic: string,
  isFormActive: boolean,
): number {
  const safeDuration = Math.max(0, Number.isFinite(durationMs) ? durationMs : 0);
  return isFormActive && ["stun", "root", "slow"].includes(mechanic)
    ? Math.round(safeDuration * 0.75)
    : safeDuration;
}

/** Spell.dbc Immolated child: tooltip formula is 4.5 × player level − 3. */
export function wow335WarlockImmolationAttackPowerReduction(level: number): number {
  const safeLevel = Math.max(1, Math.trunc(Number.isFinite(level) ? level : 1));
  return Math.max(0, Math.round(4.5 * safeLevel - 3));
}

export function wow335WarlockImmolationAttackPowerAura(level: number): AuraDefinition {
  const reduction = wow335WarlockImmolationAttackPowerReduction(level);
  return {
    id: `wow335:warlock:immolation-ap:${reduction}`,
    name: "Immolated",
    description: `Reduces attack power by ${reduction} for 30 seconds.`,
    disposition: "debuff",
    durationMs: 30_000,
    maxStacks: 1,
    stackBehavior: "replace",
    uniqueBySource: true,
    utilityTags: [WOW335_WARLOCK_METAMORPHOSIS_IMMOLATION_AP_AURA_TAG],
    modifiers: [{ kind: "stat", stat: "attack-power", operation: "flat", value: -reduction }],
  };
}

/** Numeric modifiers currently expressible by the shared aura resolver. */
export function wow335WarlockMetamorphosisAuraForRank(rank: number): AuraDefinition | null {
  const effects = wow335WarlockMetamorphosisEffectsForRank(rank);
  if (!effects) return null;
  return {
    id: "wow335:warlock:metamorphosis",
    name: "Metamorphosis",
    description: "Increases armor contribution from cloth and leather by 130% and damage dealt by 15%; reduces melee critical hits against you by 6% and stun and snare durations by 25% while transformed. The PvP-only +10% damage rider is not applied because PvP player targets are unsupported.",
    disposition: "buff",
    durationMs: effects.durationMs,
    maxStacks: 1,
    stackBehavior: "replace",
    uniqueBySource: true,
    exclusiveGroup: "warlock:form",
    utilityTags: ["shapeshift", WOW335_WARLOCK_METAMORPHOSIS_AURA_TAG],
    modifiers: [
      { kind: "stat", stat: "armor", operation: "percent", value: effects.armorContributionPercent / 100 },
      { kind: "stat", stat: "incoming-melee-critical-strike", operation: "flat", value: -effects.meleeCritChanceTakenReductionPercent },
      { kind: "damage", direction: "dealt", operation: "percent", value: effects.damagePercent / 100 },
    ],
  };
}

const formOnly = { sourceRankText: "Demon", formOnly: true } as const;

/** These rankless buttons are reconstructed from their local Spell.dbc rows and children. */
export const WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITIES: readonly AbilityDefinition[] = [
  {
    id: WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS[0], classId: "warlock", dbcSpellId: 50581,
    name: "Shadow Cleave", unlockLevel: 1, sourceUnlockLevel: 1,
    icon: "/assets/ui/spells/spell_shadow_shadowfury.png", sigil: "SC",
    description: "Inflicts 110 Shadow damage to an enemy target and nearby allies, affecting up to 3 targets. Costs 4% base mana.",
    target: "hostile", range: { min: 0, max: 5 }, castMode: "instant", castTimeMs: 0,
    cooldownMs: 6_000, gcdMs: 0,
    cost: { resource: "mana", amount: 4, percentage: true, percentageBasis: "base-mana" },
    effects: [{ kind: "damage", coefficient: 0, school: "shadow", basePoints: 110, dieSides: 1, bonusPowerCoefficient: 1 }],
    targeting: { shape: "chain", maximumTargets: 3 },
    source: "wow335-progression", ...formOnly,
  } as AbilityDefinition,
  {
    id: WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS[1], classId: "warlock", dbcSpellId: 59671,
    name: "Challenging Howl", unlockLevel: 1, sourceUnlockLevel: 1,
    icon: "/assets/ui/spells/ability_warlock_demonicempowerment.png", sigil: "CH",
    description: "Forces all nearby enemies within 10 yards to focus attacks on you for 6 seconds.",
    target: "self", range: { min: 0, max: 0 }, radius: 10, castMode: "instant", castTimeMs: 0,
    cooldownMs: 180_000, gcdMs: 1_500, cost: { resource: "rage", amount: 0 },
    effects: [{ kind: "taunt", durationMs: 6_000 }],
    targeting: { shape: "circle", radius: 10 }, source: "wow335-progression", ...formOnly,
  } as AbilityDefinition,
  {
    id: WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS[2], classId: "warlock", dbcSpellId: 54785,
    name: "Demon Charge", unlockLevel: 1, sourceUnlockLevel: 1,
    icon: "/assets/ui/spells/ability_warlock_demonicempowerment.png", sigil: "DC",
    description: "Charge an enemy, stunning it for 3 seconds. Range 8–25 yards; 45 second cooldown.",
    target: "hostile", range: { min: 8, max: 25 }, castMode: "instant", castTimeMs: 0,
    cooldownMs: 45_000, gcdMs: 1_500, cost: { resource: "mana", amount: 0 },
    effects: [
      { kind: "movement", movement: "charge", toward: "target" },
      { kind: "status", status: "stun", durationMs: 3_000 },
    ], source: "wow335-progression", ...formOnly,
  } as AbilityDefinition,
  {
    id: WOW335_WARLOCK_METAMORPHOSIS_FORM_ABILITY_IDS[3], classId: "warlock", dbcSpellId: 50589,
    name: "Immolation Aura", unlockLevel: 1, sourceUnlockLevel: 1,
    icon: "/assets/ui/spells/spell_fire_selfdestruct.png", sigil: "IA",
    description: "For 10 seconds, burns nearby enemies for 251 Fire damage plus 11.5 per level and 14.3% spell power every second within 8 yards, reducing their attack power by 4.5 × level − 3 for 30 seconds. Costs 64% base mana.",
    target: "self", range: { min: 0, max: 0 }, radius: 8, castMode: "instant", castTimeMs: 0,
    cooldownMs: 30_000, gcdMs: 1_500,
    cost: { resource: "mana", amount: 64, percentage: true, percentageBasis: "base-mana" },
    effects: [
      { kind: "dot", coefficient: 0, school: "fire", basePoints: 251, dieSides: 1, pointsPerLevel: 11.5,
        bonusPowerCoefficient: 0.143, sourceLevel: 1, ticks: 10, intervalMs: 1_000, tag: WOW335_WARLOCK_METAMORPHOSIS_IMMOLATION_TAG },
      { kind: "apply-aura", recipient: "caster", aura: {
        id: "wow335:warlock:immolation-aura", name: "Immolation Aura",
        description: "Emits Fire pulses for 10 seconds. Loss of control suppresses pulses.",
        disposition: "buff", durationMs: 10_000, maxStacks: 1, stackBehavior: "replace",
        utilityTags: [WOW335_WARLOCK_METAMORPHOSIS_IMMOLATION_TAG],
      }, sourceEffectType: 6, sourceAuraType: 23, miscValue: 0, triggerSpellId: 50590 },
    ],
    targeting: { shape: "circle", radius: 8 }, source: "wow335-progression", ...formOnly,
  } as AbilityDefinition,
];

export function wow335WarlockMetamorphosisAbility(): AbilityDefinition {
  return {
    id: "wow335-warlock-metamorphosis", classId: "warlock", dbcSpellId: 59672,
    name: "Metamorphosis", unlockLevel: 1, sourceUnlockLevel: 1,
    icon: "/assets/ui/spells/spell_shadow_demonform.png", sigil: "ME",
    description: "Transform into a Demon for 30 seconds. Increases armor contribution from cloth and leather items by 130% and damage dealt by 15%; reduces melee critical chance taken by 6% and stun/snare duration by 25%. Grants four Demon-only abilities. Only Fire/Shadow spells and abilities or spells explicitly usable while shapeshifted may be cast. PvP-only +10% damage is unsupported.",
    target: "self", range: { min: 0, max: 0 }, castMode: "instant", castTimeMs: 0,
    cooldownMs: 180_000, gcdMs: 0, cost: { resource: "mana", amount: 0 },
    effects: [{ kind: "apply-aura", recipient: "caster", aura: wow335WarlockMetamorphosisAuraForRank(1)!,
      sourceEffectType: 6, sourceAuraType: 36, miscValue: WOW335_WARLOCK_METAMORPHOSIS_FORM_ID, triggerSpellId: 0 }],
    talentNodeId: "talent-1886", source: "wow335-progression",
  };
}