// @vitest-environment jsdom
import type { BestiaryIndexEntry, PlayerCharacter } from "@initiative/domain";
import { combatantId, creatureId, playerCharacterId } from "@initiative/domain";
import { act, renderHook } from "@testing-library/react";
import { beforeEach, describe, expect, it, vi } from "vitest";
import { useEncounter } from "../use-encounter.js";

vi.mock("../../persistence/encounter-storage.js", () => ({
	loadEncounter: vi.fn().mockReturnValue(null),
	saveEncounter: vi.fn(),
}));

const { loadEncounter: mockLoad, saveEncounter: mockSave } =
	await vi.importMock<typeof import("../../persistence/encounter-storage.js")>(
		"../../persistence/encounter-storage.js",
	);

describe("useEncounter", () => {
	beforeEach(() => {
		vi.clearAllMocks();
		mockLoad.mockReturnValue(null);
	});

	it("initializes with empty encounter when persistence returns null", () => {
		const { result } = renderHook(() => useEncounter());

		expect(result.current.encounter.combatants).toEqual([]);
		expect(result.current.encounter.activeIndex).toBe(0);
		expect(result.current.encounter.roundNumber).toBe(1);
		expect(result.current.isEmpty).toBe(true);
	});

	it("initializes from stored encounter", () => {
		const stored = {
			combatants: [{ id: combatantId("c-1"), name: "Goblin" }],
			activeIndex: 0,
			roundNumber: 2,
		};
		mockLoad.mockReturnValue(stored);

		const { result } = renderHook(() => useEncounter());

		expect(result.current.encounter.combatants).toHaveLength(1);
		expect(result.current.encounter.roundNumber).toBe(2);
		expect(result.current.isEmpty).toBe(false);
	});

	it("addCombatant adds a combatant with incremental IDs and persists", () => {
		const { result } = renderHook(() => useEncounter());

		act(() => result.current.addCombatant("Goblin"));
		act(() => result.current.addCombatant("Orc"));

		expect(result.current.encounter.combatants).toHaveLength(2);
		expect(result.current.encounter.combatants[0].name).toBe("Goblin");
		expect(result.current.encounter.combatants[1].name).toBe("Orc");
		expect(result.current.isEmpty).toBe(false);
		expect(mockSave).toHaveBeenCalled();
	});

	it("removeCombatant removes a combatant and persists", () => {
		const { result } = renderHook(() => useEncounter());

		act(() => result.current.addCombatant("Goblin"));
		const id = result.current.encounter.combatants[0].id;

		act(() => result.current.removeCombatant(id));

		expect(result.current.encounter.combatants).toHaveLength(0);
		expect(result.current.isEmpty).toBe(true);
	});

	it("advanceTurn and retreatTurn update encounter state", () => {
		const { result } = renderHook(() => useEncounter());

		act(() => result.current.addCombatant("Goblin"));
		act(() => result.current.addCombatant("Orc"));

		const initialActive = result.current.encounter.activeIndex;

		act(() => result.current.advanceTurn());
		expect(result.current.encounter.activeIndex).not.toBe(initialActive);

		act(() => result.current.retreatTurn());
		expect(result.current.encounter.activeIndex).toBe(initialActive);
	});

	it("clearEncounter resets to empty and resets ID counter", () => {
		const { result } = renderHook(() => useEncounter());

		act(() => result.current.addCombatant("Goblin"));
		act(() => result.current.clearEncounter());

		expect(result.current.encounter.combatants).toHaveLength(0);
		expect(result.current.isEmpty).toBe(true);

		// After clear, IDs restart from c-1
		act(() => result.current.addCombatant("Orc"));
		expect(result.current.encounter.combatants[0].id).toBe("c-1");
	});

	it("addCombatant with opts applies initiative, ac, maxHp", () => {
		const { result } = renderHook(() => useEncounter());

		act(() =>
			result.current.addCombatant("Goblin", {
				initiative: 15,
				ac: 13,
				maxHp: 7,
			}),
		);

		const goblin = result.current.encounter.combatants[0];
		expect(goblin.initiative).toBe(15);
		expect(goblin.ac).toBe(13);
		expect(goblin.maxHp).toBe(7);
		expect(goblin.currentHp).toBe(7);
	});

	it("derived flags: hasCreatureCombatants and canRollAllInitiative", () => {
		const { result } = renderHook(() => useEncounter());

		// No creatures yet
		expect(result.current.hasCreatureCombatants).toBe(false);
		expect(result.current.canRollAllInitiative).toBe(false);

		// Add from bestiary to get a creature combatant
		const entry: BestiaryIndexEntry = {
			name: "Goblin",
			source: "MM",
			ac: 15,
			hp: 7,
			dex: 14,
			cr: "1/4",
			initiativeProficiency: 0,
			size: "Small",
			type: "humanoid",
		};

		act(() => result.current.addFromBestiary(entry));

		expect(result.current.hasCreatureCombatants).toBe(true);
		expect(result.current.canRollAllInitiative).toBe(true);
	});

	it("addFromBestiary adds combatant with HP, AC, creatureId", () => {
		const { result } = renderHook(() => useEncounter());

		const entry: BestiaryIndexEntry = {
			name: "Goblin",
			source: "MM",
			ac: 15,
			hp: 7,
			dex: 14,
			cr: "1/4",
			initiativeProficiency: 0,
			size: "Small",
			type: "humanoid",
		};

		act(() => result.current.addFromBestiary(entry));

		const combatant = result.current.encounter.combatants[0];
		expect(combatant.name).toBe("Goblin");
		expect(combatant.maxHp).toBe(7);
		expect(combatant.currentHp).toBe(7);
		expect(combatant.ac).toBe(15);
		expect(combatant.creatureId).toBe(creatureId("mm:goblin"));
	});

	it("addFromBestiary auto-numbers duplicate names", () => {
		const { result } = renderHook(() => useEncounter());

		const entry: BestiaryIndexEntry = {
			name: "Goblin",
			source: "MM",
			ac: 15,
			hp: 7,
			dex: 14,
			cr: "1/4",
			initiativeProficiency: 0,
			size: "Small",
			type: "humanoid",
		};

		act(() => result.current.addFromBestiary(entry));
		act(() => result.current.addFromBestiary(entry));

		const names = result.current.encounter.combatants.map((c) => c.name);
		expect(names).toContain("Goblin 1");
		expect(names).toContain("Goblin 2");
	});

	it("addFromPlayerCharacter adds combatant with HP, AC, color, icon", () => {
		const { result } = renderHook(() => useEncounter());

		const pc: PlayerCharacter = {
			id: playerCharacterId("pc-1"),
			name: "Aria",
			ac: 16,
			maxHp: 30,
			color: "blue",
			icon: "sword",
		};

		act(() => result.current.addFromPlayerCharacter(pc));

		const combatant = result.current.encounter.combatants[0];
		expect(combatant.name).toBe("Aria");
		expect(combatant.maxHp).toBe(30);
		expect(combatant.currentHp).toBe(30);
		expect(combatant.ac).toBe(16);
		expect(combatant.color).toBe("blue");
		expect(combatant.icon).toBe("sword");
		expect(combatant.playerCharacterId).toBe(playerCharacterId("pc-1"));
	});
});