import type { AbilityDefinition, AbilityEffect } from "./abilityCatalog";
import type { RomGeneratedAbilityLike } from "./romAbilitySemantics";

function passiveState(sourceId: number, name: string, tag: string): readonly AbilityEffect[] {
  return [{
    kind: "apply-aura",
    recipient: "caster",
    aura: {
      id: `rom-pair-passive-${sourceId}`,
      name,
      disposition: "buff",
      durationMs: null,
      utilityTags: [tag],
    },
    sourceEffectType: -1,
    sourceAuraType: -1,
    miscValue: 0,
    triggerSpellId: sourceId,
  }];
}

/** Source-specific pair mechanics that the generic component translator cannot infer. */
export function overrideRomPriestKnightEffects(
  row: RomGeneratedAbilityLike,
  translated: readonly AbilityEffect[],
): readonly AbilityEffect[] | null {
  switch (row.sourceSkillId) {
    case 492355: // Enhanced Grace of Life: Grace of Life also raises maximum MP.
      return passiveState(492355, row.name, "rom-enhanced-grace-of-life");
    case 492361: // Life Link: Urgent Heal also heals its caster.
      return passiveState(492361, row.name, "rom-life-link");
    case 499968: // Splendor Ripple: a triggered extra heal on source skill 499967.
      return passiveState(499968, row.name, "rom-splendor-ripple");
    case 499957: // Light Guidance: activate healing bonus only with source state 499966.
      return passiveState(499957, row.name, "rom-light-guidance");
    case 492638: // Lightning Rod: Lightning shocks targets already afflicted by Bone Chill.
      return passiveState(492638, row.name, "rom-priest-mage-lightning-rod");
    case 491610: // Enhanced Holy Strike: improves Holy Strike weapon damage.
      return passiveState(491610, row.name, "rom-enhanced-holy-strike");
    case 490066: // Weaken Weapon Strength: Heavenly Arrow weakens target physical damage.
      return passiveState(490066, row.name, "rom-weaken-weapon-strength");
    case 499926: // Evil Shackles: Holy Chains can root any creature with shorter duration.
      return passiveState(499926, row.name, "rom-evil-shackles");
    case 499923: // Blood Punishment: source skill 499924 grants conditional bonuses.
      return passiveState(499923, row.name, "rom-blood-punishment");
    case 491648: // Last Prayer affects only the next spell's cast time.
      return [{
        kind: "apply-aura",
        recipient: "caster",
        aura: {
          id: "rom-pair-last-prayer-next-spell",
          name: row.name,
          disposition: "buff",
          durationMs: null,
          utilityTags: ["rom-last-prayer"],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: 51,
        miscValue: -1_000,
        triggerSpellId: 0,
      }];
    case 493271: // Light Fairy has source lifetime -1; keep it until dismissal or session end.
      return translated.map((effect) => effect.kind === "summon"
        ? { ...effect, durationMs: 86_400_000 }
        : effect);
    case 492639: // Calm Heart, component 502908: 10 seconds of Fear immunity.
      return [{
        kind: "apply-aura",
        recipient: "ability-target",
        aura: {
          id: "rom-pair-calm-heart-fear-immunity",
          name: row.name,
          disposition: "buff",
          durationMs: 10_000,
          controlImmunities: ["fear"],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: -1,
        miscValue: 0,
        triggerSpellId: 0,
      }];
    case 493046: // Sacred Protection, component 503290: +100 shield block for 20 seconds.
      return [{
        kind: "apply-aura",
        recipient: "caster",
        aura: {
          id: "rom-pair-sacred-protection-block",
          name: row.name,
          disposition: "buff",
          durationMs: 20_000,
          modifiers: [{ kind: "stat", stat: "block-chance", operation: "flat", value: 100 }],
          utilityTags: ["rom-sacred-protection"],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: 172,
        miscValue: 100,
        triggerSpellId: 0,
      }];
    case 493273: // Disregard Danger: redirect 40% of one hit; caster gains 20 Parry.
      return [
        {
          kind: "apply-aura",
          recipient: "ability-target",
          aura: {
            id: "rom-pair-disregard-danger-redirect",
            name: row.name,
            disposition: "buff",
            durationMs: 10_000,
            redirectDamagePercent: 0.4,
            utilityTags: ["rom-disregard-danger-one-hit"],
            dispelCategory: "magic",
          },
          sourceEffectType: -1,
          sourceAuraType: 143,
          miscValue: 40,
          triggerSpellId: 491614,
        },
        {
          kind: "apply-aura",
          recipient: "caster",
          aura: {
            id: "rom-pair-disregard-danger-parry",
            name: `${row.name}: Parry`,
            disposition: "buff",
            durationMs: 10_000,
            modifiers: [{ kind: "stat", stat: "parry", operation: "flat", value: 20 }],
            dispelCategory: "magic",
          },
          sourceEffectType: -1,
          sourceAuraType: 22,
          miscValue: 20,
          triggerSpellId: 0,
        },
      ];
    case 491613: // Holy Chains only roots; source flag 67 is not three controls.
      return translated.filter((effect) => effect.kind === "apply-aura" && effect.control?.kind === "root");
    default:
      return null;
  }
}

function hasTag(tags: readonly string[] | ReadonlySet<string>, tag: string): boolean {
  return Array.isArray(tags) ? tags.includes(tag) : (tags as ReadonlySet<string>).has(tag);
}

/** Apply passive pair upgrades when their parent skill is actually cast. */
export function romPriestKnightCastEffects(
  ability: AbilityDefinition,
  effects: readonly AbilityEffect[],
  passiveTags: readonly string[] | ReadonlySet<string>,
  casterMaxHealth: number,
  targetTags: readonly string[] | ReadonlySet<string> = [],
  friendlyTargetHealthPercent = 1,
  learnedPassiveSpellIds: readonly number[] = [],
): readonly AbilityEffect[] {
  if (ability.source !== "runewaker" || casterMaxHealth <= 0) return effects;
  if (ability.dbcSpellId === 490261
    && learnedPassiveSpellIds.includes(493039)
    && friendlyTargetHealthPercent < 0.3) {
    // Saint's Blessing's active source components grant +30 healing points and
    // +1% healing power for 10 seconds. Put the aura before Heal so the
    // triggering cast itself receives the sourced bonus as well.
    return [{
      kind: "apply-aura",
      recipient: "caster",
      aura: {
        id: "rom-priest-saints-blessing-healing",
        name: "Saint's Blessing",
        disposition: "buff",
        durationMs: 10_000,
        modifiers: [
          { kind: "healing", direction: "done", operation: "flat", value: 30 },
          { kind: "healing", direction: "done", operation: "percent", value: 0.01 },
        ],
        dispelCategory: "magic",
      },
      sourceEffectType: -1,
      sourceAuraType: -1,
      miscValue: 0,
      triggerSpellId: 493039,
    }, ...effects];
  }
  switch (ability.dbcSpellId) {
    case 490290: // Enhanced Grace of Life mirrors source Grace's +50 and +1% HP as MP.
      if (!hasTag(passiveTags, "rom-enhanced-grace-of-life")) return effects;
      return [...effects, {
        kind: "apply-aura",
        recipient: "ability-target",
        aura: {
          id: "rom-pair-enhanced-grace-mana",
          name: "Enhanced Grace of Life: Mana",
          disposition: "buff",
          durationMs: 1_800_000,
          modifiers: [
            { kind: "resource", resource: "mana", property: "maximum", operation: "flat", value: 50 },
            { kind: "resource", resource: "mana", property: "maximum", operation: "percent", value: 0.01 },
          ],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: 8,
        miscValue: 50,
        triggerSpellId: 492355,
      }];
    case 491147: // Life Link duplicates Urgent Heal's effective payload on the caster.
      if (!hasTag(passiveTags, "rom-life-link")) return effects;
      return [...effects, ...effects.filter((effect) => effect.kind === "heal")
        .map((effect) => ({ ...effect, recipient: "caster" as const }))];
    case 490148: // Enhanced Holy Strike adds a conservative hybrid weapon bonus.
      if (!hasTag(passiveTags, "rom-enhanced-holy-strike")) return effects;
      return effects.map((effect) => effect.kind === "damage"
        ? { ...effect, coefficient: effect.coefficient * 1.1 }
        : effect);
    case 491354: // Weaken Weapon Strength debuffs targets hit by Heavenly Arrow.
      if (!hasTag(passiveTags, "rom-weaken-weapon-strength")) return effects;
      return [...effects, {
        kind: "apply-aura",
        recipient: "ability-target",
        aura: {
          id: "rom-pair-heavenly-arrow-weaken",
          name: "Weaken Weapon Strength",
          disposition: "debuff",
          durationMs: 10_000,
          modifiers: [{ kind: "damage", direction: "dealt", school: "physical", operation: "percent", value: -0.1 }],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: -1,
        miscValue: -10,
        triggerSpellId: 490066,
      }];
    case 491613: { // Evil Shackles halves duration on non-undead/demon targets.
      if (!hasTag(passiveTags, "rom-evil-shackles") || hasTag(targetTags, "rom-target-undead-demon")) return effects;
      return effects.map((effect) => effect.kind === "apply-aura" && effect.control?.kind === "root"
        ? { ...effect, aura: { ...effect.aura, durationMs: Math.max(1_000, Math.round((effect.aura.durationMs ?? 10_000) / 2)) } }
        : effect);
    }
    case 490273: // Source 499967 keeps Wave Armor's shield and adds heal component 623009.
      if (!hasTag(passiveTags, "rom-splendor-ripple")) return effects;
      return [...effects, {
        kind: "heal",
        recipient: "ability-target",
        coefficient: 0,
        basePoints: 106.25,
        pointsPerLevel: 21.25,
        sourceLevel: 1,
      }];
    case 499966: // Devotion Halo refreshes Light Guidance while the halo is active.
      if (!hasTag(passiveTags, "rom-light-guidance")) return effects;
      return [...effects, {
        kind: "apply-aura",
        recipient: "caster",
        aura: {
          id: "rom-pair-light-guidance-healing",
          name: "Light Guidance",
          disposition: "buff",
          durationMs: 900_000,
          modifiers: [{ kind: "healing", direction: "done", operation: "percent", value: 0.05 }],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: 149,
        miscValue: 5,
        triggerSpellId: 623015,
      }];
    case 490212: // Lightning Rod adds source child 502907 only while Bone Chill is on the target.
      if (!hasTag(passiveTags, "rom-priest-mage-lightning-rod")
        || !hasTag(targetTags, "rom-491165-501548-0")) return effects;
      return [...effects, {
        kind: "apply-aura",
        recipient: "ability-target",
        aura: {
          id: "rom-priest-mage-lightning-rod-shock",
          name: "Electric Shock",
          disposition: "debuff",
          durationMs: 20_000,
          modifiers: [
            { kind: "stat", stat: "resistance:frost", operation: "flat", value: -50 },
            { kind: "stat", stat: "resistance:nature", operation: "flat", value: -50 },
          ],
          utilityTags: ["rom-priest-mage-lightning-rod-shock"],
        },
        sourceEffectType: -1,
        sourceAuraType: -1,
        miscValue: 0,
        triggerSpellId: 502907,
      }];
    case 490434: // Source 499924 adds component 623167 to the base Blood Arrow.
      if (!hasTag(passiveTags, "rom-blood-punishment")) return effects;
      return [...effects, {
        kind: "apply-aura",
        recipient: "caster",
        aura: {
          id: "rom-pair-blood-arrow-healing-received",
          name: "Blood Punishment",
          disposition: "buff",
          durationMs: 30_000,
          modifiers: [{ kind: "healing", direction: "taken", operation: "percent", value: 0.5 }],
          utilityTags: ["rom-blood-arrow-upgrade"],
          dispelCategory: "magic",
        },
        sourceEffectType: -1,
        sourceAuraType: 144,
        miscValue: 50,
        triggerSpellId: 623167,
      }];
    default:
      return effects;
  }
}

/** Select the pair-specific payload branches that depend on target state. */
export function romPriestKnightConditionalCastEffects(
  ability: AbilityDefinition,
  effects: readonly AbilityEffect[],
  sealStacks: number,
  targetIsCaster: boolean,
): readonly AbilityEffect[] {
  if (ability.source !== "runewaker"
    || ability.classId !== "rom-knight"
    || ability.secondaryClassId !== "rom-priest") return effects;

  if (ability.dbcSpellId === 490194) {
    const baseHit = effects.find((effect) => effect.kind === "damage");
    if (!baseHit) return effects;
    // The generated row carries a placeholder heal with no source-backed
    // amount; only the Holy Seal components grant healing.
    const nonDamage = effects.filter((effect) => effect.kind !== "damage" && effect.kind !== "heal");
    const seals = Math.min(4, Math.max(0, Math.trunc(sealStacks)));
    if (seals === 0) return [baseHit, ...nonDamage];
    const healPercent = Math.min(8, seals * 2) / 100;
    return [
      baseHit,
      ...nonDamage,
      { kind: "heal", coefficient: 0, percentMaxHealth: healPercent, recipient: "caster" },
      {
        kind: "heal",
        coefficient: 0,
        percentMaxHealth: healPercent,
        scope: "party",
        center: "caster",
        maximumTargets: 1,
        excludeCaster: true,
      },
      { kind: "combo", amount: -seals },
    ];
  }

  if (ability.dbcSpellId === 491640) {
    const selectedThreatPolarity = targetIsCaster ? 1 : -1;
    const hasThreatPayload = effects.some((effect) => effect.kind === "apply-aura"
      && effect.aura.modifiers?.some((modifier) => modifier.kind === "stat" && modifier.stat === "threat"));
    if (!hasThreatPayload) return effects;
    return effects.map((effect) => effect.kind === "apply-aura" && effect.aura.modifiers?.some((modifier) =>
      modifier.kind === "stat" && modifier.stat === "threat")
      ? {
        ...effect,
        aura: {
          ...effect.aura,
          modifiers: effect.aura.modifiers?.map((modifier) => modifier.kind === "stat" && modifier.stat === "threat"
            ? { ...modifier, value: Math.abs(modifier.value) * selectedThreatPolarity }
            : modifier),
        },
      }
      : effect);
  }

  return effects;
}

/** Source skill 499966 is granted by the level-70 Priest/Knight elite pair. */
export function romPriestKnightAdditionalAbilities(
  catalog: readonly AbilityDefinition[],
): readonly AbilityDefinition[] {
  const lightGuidance = catalog.find((ability) => ability.dbcSpellId === 499957
    && ability.classId === "rom-priest" && ability.secondaryClassId === "rom-knight");
  if (!lightGuidance) return [];
  const effects: readonly AbilityEffect[] = [{
    kind: "apply-aura",
    recipient: "caster",
    scope: "party",
    aura: {
      id: "rom-pair-devotion-halo",
      name: "Devotion Halo",
      disposition: "buff",
      durationMs: 900_000,
      modifiers: [{ kind: "stat", stat: "wisdom", operation: "percent", value: 0.05 }],
      dispelCategory: "magic",
    },
    sourceEffectType: -1,
    sourceAuraType: 164,
    miscValue: 5,
    triggerSpellId: 623016,
  }, {
    kind: "apply-aura",
    recipient: "caster",
    scope: "party",
    excludeCaster: true,
    aura: {
      id: "rom-pair-devotion-halo-mana",
      name: "Devotion Halo Mana",
      disposition: "buff",
      durationMs: 900_000,
      modifiers: [{ kind: "resource", resource: "mana", property: "cost", operation: "percent", value: -0.06 }],
      dispelCategory: "magic",
    },
    sourceEffectType: -1,
    sourceAuraType: 164,
    miscValue: -6,
    triggerSpellId: 623016,
  }];
  return [{
    id: "rom-priest-rom-knight-elite-70-devotion-halo",
    classId: "rom-priest",
    secondaryClassId: "rom-knight",
    dbcSpellId: 499966,
    name: "Devotion Halo",
    unlockLevel: 70,
    icon: lightGuidance.icon,
    sigil: "DH",
    description: "Raises party Wisdom by 5% and lowers party mana costs by 6% for 15 minutes.",
    target: "self",
    range: { min: 0, max: 5 },
    radius: 20,
    castMode: "instant",
    castTimeMs: 0,
    cooldownMs: 0,
    gcdMs: 1_500,
    cost: { resource: "mana", amount: 0 },
    costs: [],
    effects,
    passive: false,
    source: "runewaker",
    sourceUnlockLevel: 70,
    romSkillGroup: "elite",
  }];
}