import { expect } from "@esm-bundle/chai";
import sinon from "sinon";
import { MissionManager } from "../../src/managers/MissionManager.js";
import { narrativeManager } from "../../src/managers/NarrativeManager.js";

describe("Manager: MissionManager", () => {
  let manager;
  let mockNarrativeManager;

  beforeEach(() => {
    manager = new MissionManager();

    // Mock narrativeManager
    mockNarrativeManager = {
      startSequence: sinon.stub(),
      addEventListener: sinon.stub(),
      removeEventListener: sinon.stub(),
    };

    // Replace the singleton reference in the manager if possible
    // Since it's imported, we'll need to stub the methods we use
    sinon.stub(narrativeManager, "startSequence");
    sinon.stub(narrativeManager, "addEventListener");
    sinon.stub(narrativeManager, "removeEventListener");
  });

  afterEach(() => {
    sinon.restore();
  });

  it("CoA 1: Should initialize with tutorial mission registered", () => {
    expect(manager.missionRegistry.has("MISSION_TUTORIAL_01")).to.be.true;
    expect(manager.activeMissionId).to.be.null;
    expect(manager.completedMissions).to.be.instanceof(Set);
  });

  it("CoA 2: registerMission should add mission to registry", () => {
    const newMission = {
      id: "MISSION_TEST_01",
      config: { title: "Test Mission" },
      objectives: { primary: [] },
    };

    manager.registerMission(newMission);

    expect(manager.missionRegistry.has("MISSION_TEST_01")).to.be.true;
    expect(manager.missionRegistry.get("MISSION_TEST_01")).to.equal(newMission);
  });

  it("CoA 3: getActiveMission should return tutorial if no active mission", () => {
    const mission = manager.getActiveMission();

    expect(mission).to.exist;
    expect(mission.id).to.equal("MISSION_TUTORIAL_01");
  });

  it("CoA 4: getActiveMission should return active mission if set", () => {
    const testMission = {
      id: "MISSION_TEST_01",
      config: { title: "Test" },
      objectives: { primary: [] },
    };
    manager.registerMission(testMission);
    manager.activeMissionId = "MISSION_TEST_01";

    const mission = manager.getActiveMission();

    expect(mission.id).to.equal("MISSION_TEST_01");
  });

  it("CoA 5: setupActiveMission should initialize objectives", () => {
    const mission = manager.getActiveMission();
    mission.objectives = {
      primary: [
        { type: "ELIMINATE_ALL", target_count: 5 },
        { type: "ELIMINATE_UNIT", target_def_id: "ENEMY_GOBLIN", target_count: 3 },
      ],
    };

    manager.setupActiveMission();

    expect(manager.currentObjectives).to.have.length(2);
    expect(manager.currentObjectives[0].current).to.equal(0);
    expect(manager.currentObjectives[0].complete).to.be.false;
    expect(manager.currentObjectives[1].target_count).to.equal(3);
  });

  it("CoA 6: onGameEvent should update ELIMINATE_ALL objectives", () => {
    manager.setupActiveMission();
    manager.currentObjectives = [
      { type: "ELIMINATE_ALL", target_count: 3, current: 0, complete: false },
    ];

    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_1" });
    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_2" });
    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_3" });

    expect(manager.currentObjectives[0].current).to.equal(3);
    expect(manager.currentObjectives[0].complete).to.be.true;
  });

  it("CoA 7: onGameEvent should update ELIMINATE_UNIT objectives for specific unit", () => {
    manager.setupActiveMission();
    manager.currentObjectives = [
      {
        type: "ELIMINATE_UNIT",
        target_def_id: "ENEMY_GOBLIN",
        target_count: 2,
        current: 0,
        complete: false,
      },
    ];

    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_GOBLIN" });
    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_OTHER" }); // Should not count
    manager.onGameEvent("ENEMY_DEATH", { unitId: "ENEMY_GOBLIN" });

    expect(manager.currentObjectives[0].current).to.equal(2);
    expect(manager.currentObjectives[0].complete).to.be.true;
  });

  it("CoA 8: checkVictory should dispatch mission-victory event when all objectives complete", () => {
    const victorySpy = sinon.spy();
    window.addEventListener("mission-victory", victorySpy);

    manager.setupActiveMission();
    manager.currentObjectives = [
      { type: "ELIMINATE_ALL", target_count: 2, current: 2, complete: true },
    ];
    manager.activeMissionId = "MISSION_TUTORIAL_01";

    manager.checkVictory();

    expect(victorySpy.called).to.be.true;
    expect(manager.completedMissions.has("MISSION_TUTORIAL_01")).to.be.true;

    window.removeEventListener("mission-victory", victorySpy);
  });

  it("CoA 9: completeActiveMission should add mission to completed set", () => {
    manager.activeMissionId = "MISSION_TUTORIAL_01";

    manager.completeActiveMission();

    expect(manager.completedMissions.has("MISSION_TUTORIAL_01")).to.be.true;
  });

  it("CoA 10: load should restore completed missions", () => {
    const saveData = {
      completedMissions: ["MISSION_TUTORIAL_01", "MISSION_TEST_01"],
    };

    manager.load(saveData);

    expect(manager.completedMissions.has("MISSION_TUTORIAL_01")).to.be.true;
    expect(manager.completedMissions.has("MISSION_TEST_01")).to.be.true;
  });

  it("CoA 11: save should serialize completed missions", () => {
    manager.completedMissions.add("MISSION_TUTORIAL_01");
    manager.completedMissions.add("MISSION_TEST_01");

    const saved = manager.save();

    expect(saved.completedMissions).to.be.an("array");
    expect(saved.completedMissions).to.include("MISSION_TUTORIAL_01");
    expect(saved.completedMissions).to.include("MISSION_TEST_01");
  });

  it("CoA 12: _mapNarrativeIdToFileName should convert narrative IDs to filenames", () => {
    expect(manager._mapNarrativeIdToFileName("NARRATIVE_TUTORIAL_INTRO")).to.equal(
      "tutorial_intro"
    );
    expect(manager._mapNarrativeIdToFileName("NARRATIVE_TUTORIAL_SUCCESS")).to.equal(
      "tutorial_success"
    );
    // The implementation converts NARRATIVE_UNKNOWN to narrative_unknown (lowercase with NARRATIVE_ prefix removed)
    expect(manager._mapNarrativeIdToFileName("NARRATIVE_UNKNOWN")).to.equal("narrative_unknown");
  });
});