import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "fs";
import { tmpdir } from "os";
import { join } from "path";
import { afterEach, describe, expect, it, vi } from "vitest";
import { reinjectNow, resolveReinjectSkillNames } from "../src/reinject";
import { createDefaultSettings } from "../src/settings";
import { createInitialState, trackSkill } from "../src/state";

const tempDirs: string[] = [];

afterEach(() => {
	for (const dir of tempDirs.splice(0)) {
		rmSync(dir, { recursive: true, force: true });
	}
});

function tempSkillDir(name: string): { filePath: string; baseDir: string } {
	const root = mkdtempSync(join(tmpdir(), "pi-skill-reinject-now-"));
	tempDirs.push(root);
	const baseDir = join(root, name);
	mkdirSync(baseDir, { recursive: true });
	const filePath = join(baseDir, "SKILL.md");
	writeFileSync(filePath, "# skill\n", "utf8");
	return { filePath, baseDir };
}

describe("resolveReinjectSkillNames", () => {
	it("includes loose tracked skill when file exists and requireRegistered is false", () => {
		const { filePath, baseDir } = tempSkillDir("loose");
		const state = createInitialState();
		trackSkill(state, { name: "loose", filePath, baseDir, source: "slash" });

		expect(resolveReinjectSkillNames(state, createDefaultSettings(), [])).toEqual(["loose"]);
	});

	it("excludes unregistered skills when requireRegistered is true", () => {
		const { filePath, baseDir } = tempSkillDir("strict");
		const state = createInitialState();
		trackSkill(state, { name: "strict", filePath, baseDir, source: "slash" });
		const settings = createDefaultSettings();
		settings.requireRegistered = true;

		expect(resolveReinjectSkillNames(state, settings, [])).toEqual([]);
	});
});

describe("reinjectNow loose path", () => {
	it("sends skill block from disk for unregistered tracked skill", () => {
		const { filePath, baseDir } = tempSkillDir("loose");
		const state = createInitialState();
		trackSkill(state, { name: "loose", filePath, baseDir, source: "slash" });
		const sendUserMessage = vi.fn();
		const pi = { sendUserMessage } as never;
		const ctx = { hasUI: false, isIdle: () => true } as never;

		reinjectNow(pi, state, createDefaultSettings(), ctx, []);

		expect(sendUserMessage).toHaveBeenCalledTimes(1);
		expect(sendUserMessage.mock.calls[0]?.[0]).toContain('<skill name="loose"');
	});
});