import { describe, expect, it } from "vitest";
import { editPlayerCharacter } from "../edit-player-character.js";
import type { PlayerCharacter } from "../player-character-types.js";
import { playerCharacterId } from "../player-character-types.js";
import { isDomainError } from "../types.js";
import { expectDomainError } from "./test-helpers.js";

const id = playerCharacterId("pc-1");

function makePC(overrides?: Partial<PlayerCharacter>): PlayerCharacter {
	return {
		id,
		name: "Aragorn",
		ac: 16,
		maxHp: 120,
		color: "green",
		icon: "sword",
		...overrides,
	};
}

describe("editPlayerCharacter", () => {
	it("edits name successfully", () => {
		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
		if (isDomainError(result)) throw new Error(result.message);
		expect(result.characters[0].name).toBe("Strider");
		expect(result.events[0].type).toBe("PlayerCharacterUpdated");
	});

	it("edits multiple fields", () => {
		const result = editPlayerCharacter([makePC()], id, {
			name: "Strider",
			ac: 18,
		});
		if (isDomainError(result)) throw new Error(result.message);
		expect(result.characters[0].name).toBe("Strider");
		expect(result.characters[0].ac).toBe(18);
	});

	it("returns error for not-found id", () => {
		const result = editPlayerCharacter(
			[makePC()],
			playerCharacterId("pc-999"),
			{ name: "Nope" },
		);
		expectDomainError(result, "player-character-not-found");
	});

	it("rejects empty name", () => {
		const result = editPlayerCharacter([makePC()], id, { name: "" });
		expectDomainError(result, "invalid-name");
	});

	it("rejects invalid AC", () => {
		const result = editPlayerCharacter([makePC()], id, { ac: -1 });
		expectDomainError(result, "invalid-ac");
	});

	it("rejects invalid maxHp", () => {
		const result = editPlayerCharacter([makePC()], id, { maxHp: 0 });
		expectDomainError(result, "invalid-max-hp");
	});

	it("rejects invalid color", () => {
		const result = editPlayerCharacter([makePC()], id, { color: "neon" });
		expectDomainError(result, "invalid-color");
	});

	it("rejects invalid icon", () => {
		const result = editPlayerCharacter([makePC()], id, { icon: "banana" });
		expectDomainError(result, "invalid-icon");
	});

	it("returns error when no fields changed", () => {
		const pc = makePC();
		const result = editPlayerCharacter([pc], id, {
			name: pc.name,
			ac: pc.ac,
		});
		expectDomainError(result, "no-changes");
	});

	it("emits exactly one event on success", () => {
		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
		if (isDomainError(result)) throw new Error(result.message);
		expect(result.events).toHaveLength(1);
	});

	it("clears color when set to null", () => {
		const result = editPlayerCharacter([makePC({ color: "green" })], id, {
			color: null,
		});
		if (isDomainError(result)) throw new Error(result.message);
		expect(result.characters[0].color).toBeUndefined();
	});

	it("clears icon when set to null", () => {
		const result = editPlayerCharacter([makePC({ icon: "sword" })], id, {
			icon: null,
		});
		if (isDomainError(result)) throw new Error(result.message);
		expect(result.characters[0].icon).toBeUndefined();
	});

	it("event includes old and new name", () => {
		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
		if (isDomainError(result)) throw new Error(result.message);
		const event = result.events[0];
		if (event.type !== "PlayerCharacterUpdated") throw new Error("wrong event");
		expect(event.oldName).toBe("Aragorn");
		expect(event.newName).toBe("Strider");
	});
});