import { describe, expect, it } from "vitest";
import { joinModelName, modelKeys, modelsForKey, splitModelName } from "./model-select";

describe("splitModelName", () => {
	it("splits on the first slash", () => {
		expect(splitModelName("openai/gpt-4")).toEqual({ key: "openai", model: "gpt-4" });
	});

	it("keeps slashes in the model part (splits only the first)", () => {
		expect(splitModelName("openrouter/anthropic/claude")).toEqual({
			key: "openrouter",
			model: "anthropic/claude",
		});
	});

	it("treats a slashless name as all key", () => {
		expect(splitModelName("local")).toEqual({ key: "local", model: "" });
	});
});

describe("joinModelName", () => {
	it("recombines key + model", () => {
		expect(joinModelName("openai", "gpt-4")).toBe("openai/gpt-4");
	});

	it("returns just the key when the model is empty", () => {
		expect(joinModelName("local", "")).toBe("local");
	});

	it("round-trips with splitModelName", () => {
		const full = "openrouter/anthropic/claude";
		const { key, model } = splitModelName(full);
		expect(joinModelName(key, model)).toBe(full);
	});
});

describe("modelKeys", () => {
	it("returns distinct keys in first-seen order", () => {
		expect(
			modelKeys(["openai/gpt-4", "openai/gpt-4o", "anthropic/claude-3", "google/gemini"]),
		).toEqual(["openai", "anthropic", "google"]);
	});

	it("is empty for no models", () => {
		expect(modelKeys([])).toEqual([]);
	});
});

describe("modelsForKey", () => {
	it("returns the model suffixes under a key, in order", () => {
		const models = ["openai/gpt-4", "anthropic/claude-3", "openai/gpt-4o"];
		expect(modelsForKey(models, "openai")).toEqual(["gpt-4", "gpt-4o"]);
	});

	it("returns empty for an unknown key", () => {
		expect(modelsForKey(["openai/gpt-4"], "anthropic")).toEqual([]);
	});
});