2D6-Dungeon/src/rules/combatTurns.test.ts

import { describe, expect, it } from "vitest";

import { sampleContentPack } from "@/data/sampleContentPack";

import { createStartingAdventurer } from "./character";
import { startCombatFromRoom } from "./combat";
import { resolveEnemyTurn, resolvePlayerAttack } from "./combatTurns";
import { createRoomStateFromTemplate } from "./rooms";

function createSequenceRoller(values: number[]) {
  let index = 0;

  return () => {
    const next = values[index];
    index += 1;
    return next;
  };
}

function createGuardCombat() {
  const adventurer = createStartingAdventurer(sampleContentPack, {
    name: "Aster",
    weaponId: "weapon.short-sword",
    armourId: "armour.leather-vest",
    scrollId: "scroll.lesser-heal",
  });
  const room = createRoomStateFromTemplate(
    sampleContentPack,
    "room.level1.guard-room",
    1,
    "room.level1.normal.guard-room",
  );
  room.encounter = {
    id: `${room.id}.encounter`,
    sourceTableCode: "L1G",
    creatureIds: ["a", "b"],
    creatureNames: ["Guard", "Warrior"],
    resultLabel: "Guard and Warrior",
    resolved: true,
  };

  return {
    adventurer,
    ...startCombatFromRoom({
      content: sampleContentPack,
      adventurer,
      room,
      at: "2026-03-15T13:00:00.000Z",
    }),
  };
}

describe("combat turns", () => {
  it("lets the player hit an enemy and pass initiative", () => {
    const { adventurer, combat } = createGuardCombat();
    const targetId = combat.enemies[0]!.id;

    const result = resolvePlayerAttack({
      content: sampleContentPack,
      combat,
      adventurer,
      manoeuvreId: "manoeuvre.exact-strike",
      targetEnemyId: targetId,
      roller: createSequenceRoller([6, 6]),
      at: "2026-03-15T13:01:00.000Z",
    });

    expect(result.combat.actingSide).toBe("enemy");
    expect(result.combat.selectedManoeuvreId).toBe("manoeuvre.exact-strike");
    expect(result.combat.enemies[0]?.hpCurrent).toBeLessThan(result.combat.enemies[0]!.hpMax);
    expect(result.logEntries[0]?.text).toContain("deals");
  });

  it("marks an enemy defeated when the player deals lethal damage", () => {
    const { adventurer, combat } = createGuardCombat();
    combat.enemies[0]!.hpCurrent = 1;

    const result = resolvePlayerAttack({
      content: sampleContentPack,
      combat,
      adventurer,
      manoeuvreId: "manoeuvre.guard-break",
      targetEnemyId: combat.enemies[0]!.id,
      roller: createSequenceRoller([6, 5]),
      at: "2026-03-15T13:02:00.000Z",
    });

    expect(result.defeatedEnemyIds).toEqual([combat.enemies[0]!.id]);
    expect(result.logEntries.map((entry) => entry.text)).toContain("Guard is defeated.");
  });

  it("lets an enemy attack the player and advances the round", () => {
    const { adventurer, combat } = createGuardCombat();
    const afterPlayer = resolvePlayerAttack({
      content: sampleContentPack,
      combat,
      adventurer,
      manoeuvreId: "manoeuvre.exact-strike",
      targetEnemyId: combat.enemies[0]!.id,
      roller: createSequenceRoller([4, 4]),
      at: "2026-03-15T13:03:00.000Z",
    });

    const result = resolveEnemyTurn({
      content: sampleContentPack,
      combat: afterPlayer.combat,
      adventurer,
      roller: createSequenceRoller([6, 6]),
      at: "2026-03-15T13:04:00.000Z",
    });

    expect(result.combat.round).toBe(2);
    expect(result.combat.actingSide).toBe("player");
    expect(result.combat.player.hpCurrent).toBeLessThan(result.combat.player.hpMax);
    expect(result.logEntries[0]?.text).toContain("attacks");
  });

  it("rejects player turns that target a defeated enemy", () => {
    const { adventurer, combat } = createGuardCombat();
    combat.enemies[0]!.hpCurrent = 0;

    expect(() =>
      resolvePlayerAttack({
        content: sampleContentPack,
        combat,
        adventurer,
        manoeuvreId: "manoeuvre.exact-strike",
        targetEnemyId: combat.enemies[0]!.id,
      }),
    ).toThrow("Unknown or defeated target");
  });
});