import { creatureRuntimeBaseStats } from "./azerothCoreReference";
import { bossDifficultyMultipliers } from "./dungeonDifficulty";
import { dungeonEnemyHealthBaseline, dungeonPartyHealthScale, scaledDungeonEnemyLevel } from "./dungeonLevelScaling";
import { finalDungeonBoss } from "./dungeonRunStore";
import type { DungeonDefinition } from "./dungeonTypes";
import type { PopulationEntityDefinition } from "./mobPopulation";
import type { ContentCategoryId } from "../app/contentCategories";
import { isBiteSizedDungeonId } from "./dungeonContentSource";
import { resolveBossBalanceOverride } from "./bossBalanceOverrides";
import type { CharacterStatRuleset } from "./characterStatRuleset";
import { clampPlayerLevel } from "./progression";

// Simulator health budgets measured with the five native training builds and
// active player rotations. Keep the legacy RoM/WoW-stat curve independent.
const ROM_NATIVE_HEALTH_BANDS: readonly (readonly [number, number, number])[] = [
  // character level, trash scale, boss scale
  [1, 0.4, 0.2], [10, 1.0, 0.6], [30, 1.1, 0.85], [60, 1.5, 1.5],
  [65, 1.8, 1.9], [66, 2.6, 2.8], [79, 4.5, 4.8], [80, 4.5, 4.8],
];

// Normal training-party point-damage budgets. Native HP/DEF grows faster than
// the shared creature budget; exact source formulas bypass this adjustment.
const ROM_NATIVE_DAMAGE_BANDS: readonly (readonly [number, number])[] = [
  [1, 1], [10, 1], [30, 3], [60, 10], [65, 12], [66, 20], [79, 40], [80, 40],
];

// Legacy RoM-character parties still use their compatibility-stat output
// while generated RoM NPCs use native snapshots. Retune only the boss-health
// floor for that mixed mode; explicit native RoM health bands stay independent.
const ROM_LEGACY_BOSS_HEALTH_SCALE: readonly (readonly [level: number, scale: number])[] = [
  [1, 1], [7, 1], [8, 1.12], [70, 1.12], [80, 2.3],
];

const WOW_BOSS_HEALTH_FLOOR: readonly (readonly [level: number, health: number])[] = [
  // Calibrate the starter floors to the tested Ready five-member party while
  // retaining the existing 25/45-second mechanic windows.
  [2, 1_800],
  [4, 2_600],
  [9, 7_000],
  [21, 11_000],
  [41, 23_000],
  [51, 39_000],
  [80, 180_000],
];
const WOW_BOSS_TEST_HEALTH_FLOOR: readonly (readonly [level: number, health: number])[] = [
  [2, 900],
  [4, 1_300],
  [9, 7_000],
  [21, 11_000],
  [41, 23_000],
  // Isolated test fights are normalized to the certified companion curve.
  // Native expansion-2 template health grows much faster than the party's
  // observed level-80 DPS and previously pushed the average fight above 170s.
  [80, 44_000],
];
const WOW_BOSS_TEST_DAMAGE_SCALE: readonly (readonly [level: number, scale: number])[] = [
  [1, 1],
  [50, 1],
  // Level-80 source creature weapon damage grows faster than the certified
  // healer's throughput. This keeps test-room pressure sustained without
  // turning roughly a third of catalog coverage runs into early wipes.
  [80, 0.75],
];
const BOSS_TEST_HEALTH_FLOOR_MULTIPLIER = 0.6;
const FINAL_BOSS_HEALTH_FLOOR_MULTIPLIER = 1.9;
// A single boss follows one or two short packs. Measured Ready Priest party
// damage changes sharply with unlocks, so use a small bracket curve to keep
// these bosses near the existing 25–45 second mechanic window at levels 1–80.
const BITE_SIZED_BOSS_HEALTH_BANDS: readonly (readonly [number, number, number])[] = [
  [1, 2.2, 2.45], [9, 0.95, 1.1], [10, 0.65, 0.8], [20, 0.7, 0.85],
  [30, 0.82, 0.94], [40, 0.85, 1], [50, 0.7, 0.82],
  [55, 0.43, 0.53], [60, 0.4, 0.5], [65, 0.33, 0.4],
  [70, 0.35, 0.43], [80, 0.35, 0.43],
];

function interpolatedFloor(level: number, anchors: readonly (readonly [number, number])[]): number {
  const upperIndex = anchors.findIndex(([anchorLevel]) => level <= anchorLevel);
  if (upperIndex <= 0) return anchors[0][1];
  if (upperIndex < 0) return anchors[anchors.length - 1][1];
  const [lowerLevel, lowerHealth] = anchors[upperIndex - 1];
  const [upperLevel, upperHealth] = anchors[upperIndex];
  const progress = (level - lowerLevel) / (upperLevel - lowerLevel);
  return lowerHealth + (upperHealth - lowerHealth) * progress;
}

function partyBossHealthFloor(level: number, characterSource: ContentCategoryId, testing: boolean): number {
  if (characterSource === "wow") return interpolatedFloor(
    level,
    testing ? WOW_BOSS_TEST_HEALTH_FLOOR : WOW_BOSS_HEALTH_FLOOR,
  );
  const baseline = 1_000 + level * 1_200 + level * level * 22;
  // Each catalog is calibrated independently against its strongest canonical
  // class-role cohort so every fight retains the 25/45-second mechanic window.
  return baseline * 1.15 * dungeonPartyHealthScale(characterSource);
}

/** Campaign fights retain their full durability floor; testing rooms use a reduced floor. */
export function dungeonEnemyScaling(dungeon: DungeonDefinition, entity: PopulationEntityDefinition,
  instanceId: string, characterLevel: number, difficultyId: string, bossDifficulty: number,
  characterSource: ContentCategoryId = "wow", statRuleset: CharacterStatRuleset = "wow") {
  const boss = entity.kind === "boss";
  const testing = dungeon.id.startsWith("boss-testing:");
  const level = scaledDungeonEnemyLevel(characterLevel, boss);
  const authoredHealth = entity.combat?.healthMultiplier ?? 1;
  const authoredDamage = entity.combat?.damageMultiplier ?? 1;
  const baseline = dungeonEnemyHealthBaseline(level, characterSource);
  // Isolated testing rooms retain a packaged source boss's native health so
  // developers can inspect it without changing campaign cross-catalog balance.
  const native = testing && entity.combat?.serverEntry
    ? creatureRuntimeBaseStats(entity.combat.serverEntry, level)
    : null;
  const originalHealth = (native?.health ?? baseline) * authoredHealth;
  const multipliers = boss ? bossDifficultyMultipliers(bossDifficulty) : { health: 1, damage: 1 };
  const finalBoss = boss && !testing && finalDungeonBoss(dungeon, difficultyId)?.id === instanceId;
  // Match durability to the character's game, including when crossing dungeon catalogs.
  const legacyRomCompatibilityBossScale = boss && characterSource === "rom" && statRuleset === "wow"
    ? interpolatedFloor(clampPlayerLevel(characterLevel), ROM_LEGACY_BOSS_HEALTH_SCALE)
    : 1;
  const partyHealthFloor = partyBossHealthFloor(level, characterSource, testing) * legacyRomCompatibilityBossScale;
  const biteSizedBoss = boss && !testing && isBiteSizedDungeonId(dungeon.id);
  const biteSizedFloorScale = biteSizedBoss
    ? interpolatedFloor(characterLevel, BITE_SIZED_BOSS_HEALTH_BANDS.map(([levelAnchor, floor]) => [levelAnchor, floor]))
    : 1;
  const biteSizedCeilingScale = biteSizedBoss
    ? interpolatedFloor(characterLevel, BITE_SIZED_BOSS_HEALTH_BANDS.map(([levelAnchor, , ceiling]) => [levelAnchor, ceiling]))
    : Number.POSITIVE_INFINITY;
  const finaleFloor = finalBoss && dungeon.finalBossDurability !== "standard";
  const bossFloor = partyHealthFloor * (finaleFloor ? FINAL_BOSS_HEALTH_FLOOR_MULTIPLIER
    : biteSizedFloorScale);
  // A test room's sole objective must not promote every boss to a campaign
  // finale. A reduced floor still prevents high-level source creatures with
  // tiny extrapolated level-two health from dying before mechanics can run.
  const testingBossFloor = partyHealthFloor * BOSS_TEST_HEALTH_FLOOR_MULTIPLIER;
  const testingBossCeiling = characterSource === "wow"
    ? partyHealthFloor * 0.9 * Math.max(1, Math.min(1.5, authoredHealth))
    : Number.POSITIVE_INFINITY;
  const scaledHealth = boss
    ? testing
      ? Math.max(Math.min(originalHealth, testingBossCeiling), testingBossFloor)
      : biteSizedBoss
        ? Math.min(Math.max(originalHealth, bossFloor), partyHealthFloor * biteSizedCeilingScale)
        : Math.max(originalHealth, bossFloor)
    : originalHealth;
  const testingDamageScale = testing && characterSource === "wow"
    ? interpolatedFloor(level, WOW_BOSS_TEST_DAMAGE_SCALE)
    : 1;
  const bossOverride = boss
    ? resolveBossBalanceOverride(dungeon.id, entity.id, level)
    : { healthScale: 1, damageScale: 1 };
  const nativeHealthScale = characterSource === "rom" && statRuleset === "rom"
    ? interpolatedFloor(clampPlayerLevel(characterLevel), ROM_NATIVE_HEALTH_BANDS.map(
      ([anchor, trashScale, bossScale]) => [anchor, boss ? bossScale : trashScale]))
    : 1;
  const nativeDamageBudgetScale = characterSource === "rom" && statRuleset === "rom"
    ? interpolatedFloor(clampPlayerLevel(characterLevel), ROM_NATIVE_DAMAGE_BANDS) : 1;
  return { level, maxHealth: scaledHealth * multipliers.health * bossOverride.healthScale * nativeHealthScale,
    healthMultiplier: authoredHealth * multipliers.health * bossOverride.healthScale * nativeHealthScale,
    damageMultiplier: authoredDamage * multipliers.damage * testingDamageScale * bossOverride.damageScale,
    nativeDamageBudgetScale };
}