import { describe, expect, it } from "vitest";
import { deriveDungeonEncounterCombatEvents } from "./dungeonEncounterCombatEvents";

describe("dungeon encounter combat event bridge", () => {
  it("emits stable engage, descending health, and death edges once", () => {
    const engaged = deriveDungeonEncounterCombatEvents({}, {
      boss: { engaged: true, dead: false, despawned: false, health: 1_000, maxHealth: 1_000 },
    }, 1);
    expect(engaged.events).toEqual([{ kind: "entity-engaged", entityId: "boss", now: 1 }]);

    const damaged = deriveDungeonEncounterCombatEvents(engaged.cursor, {
      boss: { engaged: true, dead: false, despawned: false, health: 490, maxHealth: 1_000 },
    }, 2);
    expect(damaged.events).toEqual([{
      kind: "entity-health",
      entityId: "boss",
      healthPercent: 49,
      now: 2,
    }]);

    const unchanged = deriveDungeonEncounterCombatEvents(damaged.cursor, {
      boss: { engaged: true, dead: false, despawned: false, health: 490, maxHealth: 1_000 },
    }, 3);
    expect(unchanged.events).toEqual([]);

    const dead = deriveDungeonEncounterCombatEvents(unchanged.cursor, {
      boss: { engaged: false, dead: true, despawned: false, health: 0, maxHealth: 1_000 },
    }, 4);
    expect(dead.events).toEqual([{ kind: "entity-death", entityId: "boss", now: 4 }]);
    expect(deriveDungeonEncounterCombatEvents(dead.cursor, {
      boss: { engaged: false, dead: true, despawned: false, health: 0, maxHealth: 1_000 },
    }, 5).events).toEqual([]);
  });

  it("does not treat scripted despawn as death and permits a later respawn edge", () => {
    const first = deriveDungeonEncounterCombatEvents({}, {
      add: { engaged: true, dead: false, despawned: false, health: 100, maxHealth: 100 },
    }, 1);
    const despawned = deriveDungeonEncounterCombatEvents(first.cursor, {
      add: { engaged: false, dead: false, despawned: true, health: 100, maxHealth: 100 },
    }, 2);
    expect(despawned.events).toEqual([]);
    expect(despawned.cursor).toEqual({});
    expect(deriveDungeonEncounterCombatEvents(despawned.cursor, {
      add: { engaged: true, dead: false, despawned: false, health: 100, maxHealth: 100 },
    }, 3).events).toEqual([{ kind: "entity-engaged", entityId: "add", now: 3 }]);
  });
});