/**
 * check-runner.test.ts — integration test for the orchestration keystone.
 *
 * Registers a throwaway "smoke" check whose fake sub-agent writes a marker
 * file, then invokes the per-check command handler with a stub context and
 * asserts the run-state marks the check complete and the marker exists.
 * Also asserts `--fix` runs the fix phase and records changes, while
 * scan-only does not.
 */
import { describe, expect, it, beforeEach, afterEach } from "bun:test";
import { mkdtemp, readFile, rm } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import {
	clearChecks,
	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, runStatePath } from "../src/run-state.js";

function smokeCheck(): CheckDefinition {
	return {
		name: "smoke",
		label: "Smoke",
		description: "Throwaway smoke check for tests",
		agentName: "scanner",
		fixAgentName: "fixer",
		phaseId: "scan",
		buildScanTask: (_cwd, scope) =>
			`!write .pygienium/smoke.marker smoke-complete\n!echo smoke-findings for ${scope.target}`,
		buildFixTask: (_cwd, _scope, findings) =>
			`!echo applied-fixes based on: ${findings.split("\n")[0] ?? ""}`,
		gate: () => undefined,
	};
}

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

describe("check-runner integration", () => {
	let cwd: string;

	beforeEach(async () => {
		clearChecks();
		setAgentRunner(fakeAgentRunner);
		cwd = await mkdtemp(join(tmpdir(), "pygienium-smoke-"));
	});

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

	it("runs a smoke check, writes a marker, and marks the check complete", async () => {
		registerCheck(smokeCheck());
		const check = smokeCheck();

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

		const state = await loadRunState(cwd);
		expect(state).toBeDefined();
		expect(state?.checks.smoke.status).toBe("complete");
		expect(state?.status).toBe("complete");

		const marker = await readFile(
			join(cwd, ".pygienium", "smoke.marker"),
			"utf8",
		);
		expect(marker.trim()).toBe("smoke-complete");

		expect(state?.checks.smoke.findings).toContain("smoke-findings");
		expect(
			state?.checks.smoke.phases.map((p) => `${p.id}=${p.status}`).join(","),
		).toContain("analysis=complete");
		expect(
			state?.checks.smoke.phases.find((p) => p.id === "fix"),
		).toBeUndefined();
	});

	it("scan-only does not produce changes and skips the fix phase", async () => {
		const check = smokeCheck();
		await handleCheckCommand(check, "", stubCtx(cwd));

		const state = await loadRunState(cwd);
		expect(state?.checks.smoke.fix).toBe(false);
		expect(state?.checks.smoke.changes).toBeUndefined();
		const fixPhase = state?.checks.smoke.phases.find((p) => p.id === "fix");
		expect(fixPhase).toBeUndefined();
	});

	it("--fix runs the fix phase and records changes", async () => {
		const check = smokeCheck();
		await handleCheckCommand(check, "--fix", stubCtx(cwd));

		const state = await loadRunState(cwd);
		expect(state?.checks.smoke.status).toBe("complete");
		expect(state?.checks.smoke.fix).toBe(true);
		expect(state?.checks.smoke.changes).toContain("applied-fixes");
		expect(state?.checks.smoke.phases.find((p) => p.id === "fix")?.status).toBe(
			"complete",
		);
	});

	it("persists run-state.json at the expected path", async () => {
		const check = smokeCheck();
		await handleCheckCommand(check, "", stubCtx(cwd));
		expect(runStatePath(cwd)).toBe(join(cwd, ".pygienium", "run-state.json"));
		const raw = await readFile(runStatePath(cwd), "utf8");
		expect(JSON.parse(raw).checks.smoke.status).toBe("complete");
	});

	it("marks a check skipped when the gate returns an error", async () => {
		const gated: CheckDefinition = {
			...smokeCheck(),
			name: "gated",
			label: "Gated",
			gate: () => "no source files matched",
		};
		await handleCheckCommand(gated, "", stubCtx(cwd));
		const state = await loadRunState(cwd);
		expect(state?.checks.gated.status).toBe("skipped");
		expect(state?.checks.gated.error).toBe("no source files matched");
	});
});