import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import { createTestSession, type TestSession } from "../../../test/harness";
import { __test } from "../index.ts";

const extensionPath = path.resolve(import.meta.dirname, "../index.ts");
const pairs = [{ executor: "openai/gpt-4o", advisor: "openai/gpt-4o" }];

type Case = { user?: unknown; project?: unknown; untrusted?: boolean };

describe("angel settings resolution", () => {
	let t: TestSession | undefined;
	let root: string | undefined;
	afterEach(() => {
		t?.dispose();
		t = undefined;
		if (root) rmSync(root, { recursive: true, force: true });
		root = undefined;
	});

	async function start(input: Case) {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-angel-settings-"));
		const write = (dir: string, value: unknown) => {
			mkdirSync(dir, { recursive: true });
			writeFileSync(
				path.join(dir, "settings.json"),
				JSON.stringify({ angel: value }),
			);
		};
		if ("user" in input)
			write(path.join(root, ".test-home/.pi/agent"), input.user);
		if ("project" in input) write(path.join(root, ".pi"), input.project);
		t = await createTestSession({ cwd: root, extensions: [extensionPath] });
		if (input.untrusted) t.session.settingsManager.setProjectTrusted(false);
		// The harness already emitted session_start; count only this start.
		const before = t.events.uiCallsFor("notify").length;
		await t.session.extensionRunner.emit({
			type: "session_start",
			reason: "startup",
		});
		const warnings = t.events
			.uiCallsFor("notify")
			.slice(before)
			.filter((call) => call.args[1] === "warning")
			.map((call) => call.args[0]);
		return {
			active: t.session.getActiveToolNames().includes("angel"),
			warnings,
		};
	}

	it.each([
		["default unconfigured", {}, false],
		["user pairs", { user: { pairs } }, true],
		["project pairs", { project: { pairs } }, true],
		[
			"project enabled false merged over user pairs",
			{ user: { pairs }, project: { enabled: false } },
			false,
		],
		[
			"project enabled true merged over user enabled false",
			{ user: { pairs, enabled: false }, project: { enabled: true } },
			true,
		],
		[
			"project pairs array replaces user pairs",
			{ user: { pairs }, project: { pairs: [] } },
			false,
		],
		[
			"untrusted project ignored",
			{ user: { pairs }, project: { enabled: false }, untrusted: true },
			true,
		],
	] satisfies [string, Case, boolean][])(
		"%s",
		async (_name, input, expected) => {
			const { active, warnings } = await start(input);
			expect(active).toBe(expected);
			expect(warnings).toEqual([]);
		},
	);

	it.each([
		[
			"non-object project block",
			{ user: { pairs }, project: true },
			"Invalid angel from project settings: expected an object",
		],
		[
			"merged enabled string",
			{ user: { pairs }, project: { enabled: "false" } },
			"Invalid angel from merged project and user settings: enabled must be a boolean",
		],
		[
			"user thinkingLevel",
			{ user: { pairs, thinkingLevel: "extreme" } },
			"Invalid angel from user settings: thinkingLevel must be one of off, minimal, low, medium, high, xhigh, max",
		],
		[
			"user pair shape",
			{ user: { pairs: [{ executor: "openai/gpt-4o" }] } },
			"Invalid angel from user settings: pairs must be an array of { executor, advisor } strings",
		],
		[
			"user subagentExtensions",
			{ user: { pairs, subagentExtensions: "web" } },
			'Invalid angel from user settings: subagentExtensions must be "all", "none", or an extension-name array',
		],
	] satisfies [string, Case, string][])(
		"rejects %s without falling through",
		async (_name, input, message) => {
			const { active, warnings } = await start(input);
			expect(active).toBe(false);
			expect(warnings).toEqual([`${message}; Angel unconfigured`]);
		},
	);
});

describe("angel sub-agent extensions", () => {
	it("defaults sub-agent extension loading to none", () => {
		expect(__test.resolveSubagentExtensions(undefined)).toMatchObject({
			all: false,
			paths: [],
		});
	});

	it("resolves a static sibling-extension whitelist", () => {
		const selection = __test.resolveSubagentExtensions([" web ", "web"]);
		expect(selection.all).toBe(false);
		expect(selection.paths).toHaveLength(1);
		expect(selection.paths[0]?.replaceAll("\\", "/")).toMatch(
			/extensions\/web\/index\.ts$/,
		);
	});

	it("rejects unknown sibling extensions", () => {
		expect(() => __test.resolveSubagentExtensions(["does-not-exist"])).toThrow(
			"angel: unknown sub-agent extension: does-not-exist",
		);
	});
});