import type { AbilityDefinition, ResourceType } from "./abilityCatalog";
import type { ActiveAura } from "./combatAuras";

export const ROM_SCOUT_BLOOD_ARROW_ABILITY_ID = "rom-scout-general-4";
export const ROM_SCOUT_BLOOD_ARROW_SOURCE_SKILL_ID = 490434;
export const ROM_SCOUT_BLOOD_ARROW_AURA_TAG = "rom-self-health-drain";
export const ROM_SCOUT_BLOOD_ARROW_DEACTIVATION_COOLDOWN_MS = 10_000;

export interface RomBloodArrowOwnerBuild {
  readonly classId: string;
  readonly secondaryClassId?: string | null;
}

export function isRomScoutBloodArrowAbility(ability: AbilityDefinition): boolean {
  return ability.source === "runewaker"
    && ability.id === ROM_SCOUT_BLOOD_ARROW_ABILITY_ID
    && ability.classId === "rom-scout"
    && ability.secondaryClassId === undefined
    && ability.dbcSpellId === ROM_SCOUT_BLOOD_ARROW_SOURCE_SKILL_ID;
}

export function isRomKnightScoutBloodArrowOwner(owner: RomBloodArrowOwnerBuild): boolean {
  return owner.classId === "rom-knight" && owner.secondaryClassId === "rom-scout";
}

export function isRomScoutRogueBloodArrowOwner(owner: RomBloodArrowOwnerBuild): boolean {
  return owner.classId === "rom-scout" && owner.secondaryClassId === "rom-rogue";
}

export function isRomBloodArrowOwner(owner: RomBloodArrowOwnerBuild): boolean {
  return isRomKnightScoutBloodArrowOwner(owner) || isRomScoutRogueBloodArrowOwner(owner);
}

function bloodArrowDescriptionForOwner(owner: RomBloodArrowOwnerBuild): string {
  if (isRomKnightScoutBloodArrowOwner(owner)) {
    return "Activates Blood Arrow and increases ranged weapon damage. Each offensive ranged weapon skill costs 2.0% HP and 1.0% MP. Right-click the buff icon or use the skill again to deactivate; the skill enters a 10-second cooldown after deactivation.";
  }
  if (isRomScoutRogueBloodArrowOwner(owner)) {
    return "Activates Blood Arrow and increases physical ranged weapon damage. Ranged attacks cost 2.0% HP each. Right-click the buff icon or use the skill again to deactivate; the skill enters a 10-second cooldown after deactivation.";
  }
  return "Activates Blood Arrow and increases physical ranged weapon damage. Right-click the buff icon or use the skill again to deactivate; the skill enters a 10-second cooldown after deactivation.";
}

function indefiniteBloodArrowEffects(effects: AbilityDefinition["effects"]): AbilityDefinition["effects"] {
  const auraEffect = effects.find((effect) => effect.kind === "apply-aura" && effect.recipient === "caster");
  if (auraEffect?.kind !== "apply-aura") return effects;
  return [{
    ...auraEffect,
    aura: {
      ...auraEffect.aura,
      durationMs: null,
      utilityTags: auraEffect.aura.utilityTags?.includes(ROM_SCOUT_BLOOD_ARROW_AURA_TAG)
        ? auraEffect.aura.utilityTags
        : [...(auraEffect.aura.utilityTags ?? []), ROM_SCOUT_BLOOD_ARROW_AURA_TAG],
    },
  }];
}

export function romBloodArrowAbilityForOwner(
  ability: AbilityDefinition,
  owner: RomBloodArrowOwnerBuild,
): AbilityDefinition {
  if (!isRomScoutBloodArrowAbility(ability) || !isRomBloodArrowOwner(owner)) return ability;
  const description = bloodArrowDescriptionForOwner(owner);
  return {
    ...ability,
    description,
    cooldownMs: 0,
    effects: indefiniteBloodArrowEffects(ability.effects),
    ranks: ability.ranks?.map((rank) => ({
      ...rank,
      description,
      cooldownMs: 0,
      effects: indefiniteBloodArrowEffects(rank.effects),
    })),
  };
}

export function isRomKnightScoutOffensiveRangedWeaponSkill(
  ability: AbilityDefinition,
  owner: RomBloodArrowOwnerBuild,
): boolean {
  if (!isRomKnightScoutBloodArrowOwner(owner)
    || ability.source !== "runewaker"
    || ability.passive
    || ability.dbcSpellId === ROM_SCOUT_BLOOD_ARROW_SOURCE_SKILL_ID
    || ability.dbcSpellId === 492589 // Autoshot is an ongoing mode, not a cast trigger.
    || ability.sourceAttackKind === "melee"
    || !ability.effects.some((effect) => effect.kind === "damage" || effect.kind === "dot")) return false;

  const scoutSkill = ability.classId === "rom-scout"
    && ability.secondaryClassId === undefined
    && ability.romSkillGroup === "general";
  const knightScoutElite = ability.classId === "rom-knight" && ability.secondaryClassId === "rom-scout";
  return (scoutSkill || knightScoutElite)
    && (/ranged weapon DPS/i.test(ability.description) || ability.dbcSpellId === 490420);
}

export function isRomScoutRogueRangedAttackSkill(
  ability: AbilityDefinition,
  owner: RomBloodArrowOwnerBuild,
): boolean {
  if (!isRomScoutRogueBloodArrowOwner(owner)
    || ability.source !== "runewaker"
    || ability.passive
    || ability.dbcSpellId === ROM_SCOUT_BLOOD_ARROW_SOURCE_SKILL_ID
    || ability.dbcSpellId === 492589 // Autoshot is an ongoing mode, not a cast trigger.
    || ability.sourceAttackKind === "melee"
    || !ability.effects.some((effect) => effect.kind === "damage" || effect.kind === "dot")) return false;

  const scoutGeneralSkill = ability.classId === "rom-scout"
    && ability.secondaryClassId === undefined
    && (ability.romSkillGroup === "general" || ability.romSkillGroup === "primary");
  return scoutGeneralSkill
    && (/ranged weapon DPS/i.test(ability.description) || ability.dbcSpellId === 490420);
}

export function romBloodArrowCastCosts(
  ability: AbilityDefinition,
  owner: RomBloodArrowOwnerBuild,
  auras: readonly ActiveAura[],
  ownerId: string,
  maxHealth: number,
  maxMana: number,
  now?: number,
): readonly { readonly resource: ResourceType; readonly amount: number }[] {
  if (!isRomBloodArrowOwner(owner)
    || !auras.some((aura) => aura.sourceId === ownerId
      && aura.targetId === ownerId
      && (now === undefined || aura.expiresAt === null || aura.expiresAt > now)
      && aura.definition.utilityTags?.includes(ROM_SCOUT_BLOOD_ARROW_AURA_TAG))) return [];

  if (isRomKnightScoutBloodArrowOwner(owner)
    && isRomKnightScoutOffensiveRangedWeaponSkill(ability, owner)) {
    return [
      { resource: "health", amount: Math.max(0, Math.round(maxHealth * 0.02)) },
      { resource: "mana", amount: Math.max(0, Math.round(maxMana * 0.01)) },
    ];
  }

  if (isRomScoutRogueBloodArrowOwner(owner)
    && isRomScoutRogueRangedAttackSkill(ability, owner)) {
    return [{ resource: "health", amount: Math.max(0, Math.round(maxHealth * 0.02)) }];
  }

  return [];
}

export function romScoutRogueBloodArrowRangedAutoAttackCost(
  owner: RomBloodArrowOwnerBuild,
  auras: readonly ActiveAura[],
  ownerId: string,
  maxHealth: number,
  now: number,
): number {
  return isRomScoutRogueBloodArrowOwner(owner)
    && hasOwnedRomScoutBloodArrow(auras, ownerId, now)
    ? Math.max(0, Math.round(maxHealth * 0.02))
    : 0;
}

export function hasOwnedRomScoutBloodArrow(
  auras: readonly ActiveAura[],
  ownerId: string,
  now: number,
): boolean {
  return auras.some((aura) => aura.sourceId === ownerId
    && aura.targetId === ownerId
    && (aura.expiresAt === null || aura.expiresAt > now)
    && aura.definition.utilityTags?.includes(ROM_SCOUT_BLOOD_ARROW_AURA_TAG));
}

export function isOwnedRomScoutBloodArrowAura(aura: ActiveAura, ownerId: string): boolean {
  return aura.sourceId === ownerId
    && aura.targetId === ownerId
    && aura.definition.utilityTags?.includes(ROM_SCOUT_BLOOD_ARROW_AURA_TAG) === true;
}

export function deactivateRomBloodArrowFromAuraContextMenu(
  aura: ActiveAura,
  ownerId: string,
  deactivate: (ownerId: string, now?: number) => boolean,
  now?: number,
): boolean {
  return isOwnedRomScoutBloodArrowAura(aura, ownerId)
    && deactivate(ownerId, now);
}