import { describe, expect, it } from "vitest";
import {
  damageAfterArmor,
  healthFromStamina,
  itemStatSummary,
  itemStatsFor,
  normalizeItemStats,
  weaponDps,
} from "./itemStats";

describe("boss item stats", () => {
  it("scales the original 3.3.5a attributes without changing their distribution", () => {
    const base = {
      itemId: 5404,
      inventorySlot: "chest",
      armorType: "leather",
      weaponType: null,
    } as const;
    const low = itemStatsFor({ ...base, quality: "uncommon", itemLevel: 10 });
    const high = itemStatsFor({ ...base, quality: "rare", itemLevel: 30 });

    expect(high.agility).toBeGreaterThan(low.agility);
    expect(high.armor).toBeGreaterThan(low.armor);
    expect(high.strength).toBe(0);
    expect(itemStatSummary(high)).toContain("Agility");
    expect(itemStatSummary(high)).toContain("Armor");
  });

  it("retains original weapon damage, school, speed, and DPS", () => {
    const firebelcher = itemStatsFor({
      itemId: 5243,
      quality: "rare",
      inventorySlot: "ranged",
      armorType: null,
      weaponType: "wand",
      itemLevel: 20,
      sourceItemLevel: 20,
    });
    expect(firebelcher.rangedWeapon).toMatchObject({
      damageMin: 24,
      damageMax: 45,
      damageSchool: "fire",
      speedMs: 1700,
    });
    expect(weaponDps(firebelcher.rangedWeapon!)).toBeCloseTo(20.29, 2);
  });

  it("migrates pre-stat saved loot from its captured item metadata", () => {
    const fallback = {
      itemId: 6631,
      quality: "rare" as const,
      inventorySlot: "two-hand",
      armorType: null,
      weaponType: "staff",
      itemLevel: 25,
    };
    expect(normalizeItemStats(undefined, fallback)).toEqual(itemStatsFor(fallback));
  });

  it("persists explicit RoM-native gear separately from unchanged WotLK stats", () => {
    const source = {
      itemId: 999001,
      quality: "rare" as const,
      inventorySlot: "head",
      armorType: null,
      weaponType: null,
      itemLevel: 20,
      sourceItemLevel: 20,
      sourceStats: { strength: 8, spellPower: 40 },
      romNative: { strength: 3, magicalDamage: 17, healPowerRateFactor: 1.15 },
    };
    const item = itemStatsFor(source);
    expect(item).toMatchObject({ strength: 8, spellPower: 40 });
    expect(item.romNative).toEqual(source.romNative);
    expect(normalizeItemStats(item, source)).toMatchObject({
      strength: 8,
      spellPower: 40,
      romNative: source.romNative,
    });
  });

  it("turns stamina into health and armor into reduced incoming damage", () => {
    expect(healthFromStamina(7)).toBe(70);
    expect(damageAfterArmor(100, 0, 20)).toBe(100);
    expect(damageAfterArmor(100, 120, 20)).toBeLessThan(100);
  });
});