import { describe, expect, it } from "vitest";
import type { ClassId } from "../app/characterCatalog";
import { classCanEquipItem, equipmentSlotForItem } from "./equipment";
import {
  compareEquipmentUpgrade,
  resolvedAverageItemLevel,
  resolvedEquipmentItems,
  resolvedEquipmentLoadout,
  type HeirloomContext,
} from "./heirloomEquipment";
import { itemStatsFor } from "./itemStats";
import { LOOT_CATALOG, scaledLootItemLevel, type LootCatalogItem } from "./lootCatalog";
import type { InventoryItem } from "./lootTypes";
import {
  SPECIALIZATION_DEFINITIONS,
  type SpecializationDefinition,
} from "./specializationCatalog";
import { useCombatStore } from "./combatStore";
import { normalizeInventory } from "./lootTypes";

const templates = LOOT_CATALOG.bosses.flatMap((boss) => boss.items);

function context(profile: SpecializationDefinition, level: number, ownerKind: "player" | "party" = "player"): HeirloomContext {
  return {
    ownerId: ownerKind === "player" ? "player" : `party-${profile.id}`,
    ownerKind,
    classId: profile.classId,
    specializationId: profile.id,
    role: profile.role,
    level,
  };
}

function catalogItem(template: LootCatalogItem, itemLevel: number, suffix = "test"): InventoryItem {
  return {
    instanceId: `${template.itemId}:${itemLevel}:${suffix}`,
    itemId: template.itemId,
    itemKey: template.itemKey,
    name: template.itemName,
    quality: template.quality,
    inventorySlot: template.inventorySlot,
    armorType: template.armorType,
    weaponType: template.weaponType,
    itemLevel,
    sourceItemLevel: template.sourceItemLevel,
    stats: itemStatsFor({ ...template, itemLevel }),
    quantity: 1,
    sourceBossKey: "test-boss",
    sourceBossName: "Test Boss",
    acquiredAt: 1,
  };
}

function compatibleItems(classId: ClassId, level: number): InventoryItem[] {
  return templates
    .map((template, index) => catalogItem(template, level, String(index)))
    .filter((item) => classCanEquipItem(classId, item));
}

describe("specialization-aware heirlooms", () => {
  it("caps player heirlooms at 79 and party heirlooms at 80", () => {
    const profile = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "priest:holy")!;
    expect(new Set(resolvedEquipmentItems({}, [], context(profile, 80)).map((item) => item.itemLevel))).toEqual(new Set([79]));
    expect(new Set(resolvedEquipmentItems({}, [], context(profile, 80, "party")).map((item) => item.itemLevel))).toEqual(new Set([80]));
    expect(resolvedAverageItemLevel({}, [], context(profile, 40))).toBe(40);
  });

  it("fills all applicable slots and uses the specialization weapon layout", () => {
    const protection = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "warrior:protection")!;
    const loadout = resolvedEquipmentLoadout({}, [], context(protection, 40));
    expect(loadout["head"]?.quality).toBe("heirloom");
    expect(loadout["finger"]?.quality).toBe("heirloom");
    expect(loadout["trinket"]?.quality).toBe("heirloom");
    expect(loadout["main-hand"]?.inventorySlot).toBe("one-hand");
    expect(loadout["off-hand"]?.armorType).toBe("shield");
  });

  it("allocates only useful archetype stats", () => {
    const protection = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "warrior:protection")!;
    const holy = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "priest:holy")!;
    const combat = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "rogue:combat")!;
    const protectionStats = resolvedEquipmentItems({}, [], context(protection, 40)).find((item) => item.inventorySlot === "chest")!.stats;
    const holyStats = resolvedEquipmentItems({}, [], context(holy, 40)).find((item) => item.inventorySlot === "chest")!.stats;
    const combatStats = resolvedEquipmentItems({}, [], context(combat, 40)).find((item) => item.inventorySlot === "chest")!.stats;
    expect(protectionStats).toMatchObject({ stamina: expect.any(Number), defenseRating: expect.any(Number), blockRating: expect.any(Number), spellPower: 0 });
    expect(holyStats).toMatchObject({ intellect: expect.any(Number), spirit: expect.any(Number), spellPower: expect.any(Number), mp5: expect.any(Number), attackPower: 0 });
    expect(combatStats).toMatchObject({ agility: expect.any(Number), attackPower: expect.any(Number), hitRating: expect.any(Number), spellPower: 0 });
    expect(protectionStats.blockRating).toBeGreaterThan(0);
    expect(holyStats.spellPower).toBeGreaterThan(0);
    expect(combatStats.agility).toBeGreaterThan(0);
  });

  it.each([1, 40, 79])("keeps compatible same-level boss items below heirlooms at level %i", (level) => {
    for (const profile of SPECIALIZATION_DEFINITIONS) {
      const loadout = resolvedEquipmentLoadout({}, [], context(profile, level));
      for (const item of compatibleItems(profile.classId, level)) {
        expect(compareEquipmentUpgrade(item, loadout, profile, context(profile, level)).isUpgrade, `${profile.id}: ${item.name}`).toBe(false);
      }
    }
  });

  it("opens a real item-level-85 upgrade path for every gear profile at level 80", () => {
    expect(scaledLootItemLevel(79)).toBe(79);
    expect(scaledLootItemLevel(80)).toBe(85);
    for (const profile of SPECIALIZATION_DEFINITIONS) {
      const loadout = resolvedEquipmentLoadout({}, [], context(profile, 80));
      const upgrades = compatibleItems(profile.classId, 85)
        .filter((item) => compareEquipmentUpgrade(item, loadout, profile, context(profile, 80)).isUpgrade);
      expect(upgrades.length, profile.id).toBeGreaterThan(0);
    }
  });

  it("lets earned assignments override a slot and restores its heirloom when removed", () => {
    const profile = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "priest:holy")!;
    const ownerContext = context(profile, 80);
    const item = compatibleItems(profile.classId, 85).find((candidate) => equipmentSlotForItem(candidate) === "head")
      ?? compatibleItems(profile.classId, 85)[0];
    const slot = equipmentSlotForItem(item)!;
    const equipped = resolvedEquipmentLoadout({ player: { [slot]: item.instanceId } }, [item], ownerContext);
    expect(equipped[slot]).toBe(item);
    expect(resolvedEquipmentLoadout({}, [item], ownerContext)[slot]?.quality).toBe("heirloom");
  });

  it("preserves player health and resource percentages across gear maximum changes", () => {
    const profile = SPECIALIZATION_DEFINITIONS.find((definition) => definition.id === "priest:holy")!;
    useCombatStore.getState().initializeCharacter({
      classId: "priest",
      specializationId: profile.id,
      role: profile.role,
      level: 40,
    });
    const item = compatibleItems("priest", 85).find((candidate) => equipmentSlotForItem(candidate) === "head")
      ?? compatibleItems("priest", 85)[0];
    const before = useCombatStore.getState();
    useCombatStore.setState({
      health: before.maxHealth * 0.4,
      resource: before.maxResource * 0.25,
      inventory: [item],
    });
    expect(useCombatStore.getState().equipItem(item.instanceId)).toBe(true);
    expect(useCombatStore.getState().health / useCombatStore.getState().maxHealth).toBeCloseTo(0.4, 5);
    expect(useCombatStore.getState().resource / useCombatStore.getState().maxResource).toBeCloseTo(0.25, 5);
  });

  it("raises persisted item safety to 255 without admitting virtual heirlooms", () => {
    const persisted = { ...compatibleItems("priest", 85)[0], itemLevel: 999 };
    expect(normalizeInventory([persisted])[0].itemLevel).toBe(255);
    expect(normalizeInventory([{ ...persisted, quality: "heirloom" }])).toEqual([]);
  });
});