/**
 * deep-modules.test.ts — integration test for the deep-modules check.
 *
 * Seeds a temp workspace with a pass-through wrapper module (a shallow
 * abstraction), runs the check with the deterministic fake agent runner, and
 * asserts:
 *   - the scan persists `findings.md` flagging the wrapper as a pass-through;
 *   - with `--fix`, the safe consolidation is applied (wrapper rewritten/
 *     removed) and `changes.md` records it (auto), while a risky
 *     external-importer case is listed for review (manual), never auto-applied.
 */
import { describe, expect, it, beforeEach, afterEach } from "bun:test";
import { existsSync } from "node:fs";
import { mkdtemp, mkdir, rm, writeFile, readFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import {
	clearChecks,
	getCheck,
	registerCheck,
	type CheckDefinition,
} from "../src/checks/registry.js";
import {
	setAgentRunner,
	resetAgentRunner,
	fakeAgentRunner,
} from "../src/agent-runner.js";
import { handleCheckCommand, type PygieniumCtx } from "../src/commands.js";
import { loadRunState } from "../src/run-state.js";
import {
	findingsPath,
	changesPath,
	check as deepModulesCheck,
} from "../src/checks/deep-modules.js";

function stubCtx(cwd: string): PygieniumCtx {
	return { cwd,  hasUI: false, ui: undefined } as PygieniumCtx;
}

/** Drop a pass-through wrapper module that forwards a single lib call. */
async function seedPassThrough(
	dir: string,
): Promise<{ wrapper: string; lib: string }> {
	const wrapper = join(dir, "wrapper.ts");
	const lib = join(dir, "lib.ts");
	await mkdir(dir, { recursive: true }).catch(() => {});
	await writeFile(
		lib,
		`export function compute(x: number): number { return x * 2; }\n`,
		"utf8",
	);
	// Shallow pass-through: forwards every argument to `lib` with zero added logic.
	await writeFile(
		wrapper,
		`import { compute } from "./lib";\nexport function run(x: number) { return compute(x); }\n`,
		"utf8",
	);
	return { wrapper, lib };
}

describe("deep-modules check", () => {
	let cwd: string;

	beforeEach(async () => {
		clearChecks();
		setAgentRunner(fakeAgentRunner);
		// Re-register explicitly: the module's import-time registerCheck only
		// runs once (module cache), so clearChecks + registerCheck restores it
		// deterministically for each test.
		registerCheck(deepModulesCheck);
		cwd = await mkdtemp(join(tmpdir(), "pygienium-deep-"));
	});

	afterEach(async () => {
		resetAgentRunner();
		await rm(cwd, { recursive: true, force: true }).catch(() => {});
	});

	it("is registered and uses the deep-modules scanner agent", () => {
		const check = getCheck("deep-modules");
		expect(check).toBeDefined();
		expect((check as CheckDefinition)?.agentName).toBe("deep-modules");
	});

	it("flags the pass-through wrapper in findings.md", async () => {
		await seedPassThrough(cwd);
		const check = getCheck("deep-modules")!;

		await handleCheckCommand(check, "", stubCtx(cwd));

		const findings = await readFile(findingsPath(cwd), "utf8");
		expect(findings).toContain("wrapper.ts");
		expect(findings).toContain("pass-through-wrapper");
		expect(findings).toMatch(/importers:\s*0/);

		// Run state records the scan summary as findings text.
		const state = await loadRunState(cwd);
		expect(state?.checks["deep-modules"]?.status).toBe("complete");
		expect(state?.checks["deep-modules"]?.findings).toContain(
			"deep-modules: 1 issue",
		);
	});

	it("scan-only does not write changes.md", async () => {
		await seedPassThrough(cwd);
		const check = getCheck("deep-modules")!;

		await handleCheckCommand(check, "", stubCtx(cwd));

		expect(existsSync(changesPath(cwd))).toBe(false);
	});

	it("--fix applies the safe consolidation and records changes.md (auto), and defers the risky one (manual)", async () => {
		await seedPassThrough(cwd);
		// Also drop a "risky" adapter so we can assert it is NOT auto-applied.
		await writeFile(
			join(cwd, "risky-adapter.ts"),
			`// adapter-layer with external importers — should be listed for review only\nexport const risky = true;\n`,
			"utf8",
		);
		const check = getCheck("deep-modules")!;

		await handleCheckCommand(check, "--fix", stubCtx(cwd));

		const changes = await readFile(changesPath(cwd), "utf8");
		// Safe pass-through: consolidation applied (auto).
		expect(changes).toContain("wrapper.ts");
		expect(changes).toMatch(/auto/);
		expect(changes).toMatch(/consolidat/i);

		// Risky adapter: listed for review, not auto-applied (manual).
		expect(changes).toContain("risky-adapter.ts");
		expect(changes).toMatch(/manual/);

		// The safe wrapper was rewritten — no longer a pass-through.
		const wrapperContent = await readFile(join(cwd, "wrapper.ts"), "utf8");
		expect(wrapperContent).not.toContain("import { compute }");
		expect(wrapperContent).toContain("Consolidated");

		const state = await loadRunState(cwd);
		expect(state?.checks["deep-modules"]?.fix).toBe(true);
		expect(state?.checks["deep-modules"]?.changes).toContain(
			"1 auto-applied, 1 deferred",
		);
		expect(state?.checks["deep-modules"]?.status).toBe("complete");
	});

	it("findings.md and changes.md live under .pygienium/checks/deep-modules/", async () => {
		await seedPassThrough(cwd);
		const check = getCheck("deep-modules")!;
		await handleCheckCommand(check, "--fix", stubCtx(cwd));
		expect(findingsPath(cwd)).toBe(
			join(cwd, ".pygienium", "checks", "deep-modules", "findings.md"),
		);
		expect(changesPath(cwd)).toBe(
			join(cwd, ".pygienium", "checks", "deep-modules", "changes.md"),
		);
	});

	it("skips when the target has no source files", async () => {
		const empty = await mkdtemp(join(tmpdir(), "pygienium-empty-"));
		try {
			const check = getCheck("deep-modules")!;
			await handleCheckCommand(check, empty, stubCtx(cwd));
			const state = await loadRunState(cwd);
			expect(state?.checks["deep-modules"]?.status).toBe("skipped");
		} finally {
			await rm(empty, { recursive: true, force: true }).catch(() => {});
		}
	});
});