/**
 * all.test.ts — integration test for the `/pygienium-all` orchestrator (task 12).
 *
 * Mirrors the spec scenario: run `/pygienium-all` on a small repo and assert:
 *   - every registered check runs exactly once in registry order;
 *   - run-state shows all checks complete and the overall run complete;
 *   - `.pygienium/all-summary.md` is present and lists per-check outcomes;
 *   - `--only=alpha,gamma` narrows the candidate set preserving order;
 *   - interrupted/resumed runs re-dispatch non-terminal checks while skipping
 *     terminal ones, unless `--fresh` resets everything.
 *
 * A tracker wraps the fake agent runner so we can assert dispatch order and
 * counts without a model.
 */
import { describe, expect, it, beforeEach, afterEach } from "bun:test";
import { mkdtemp, mkdir, 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,
	type AgentRunner,
} from "../src/agent-runner.js";
import { handleAllCommand, type PygieniumCtx } from "../src/commands.js";
import {
	parseAllArgs,
	runAllChecks,
	allSummaryPath,
	renderAllSummary,
	selectChecks,
} from "../src/modes/all.js";
import {
	loadRunState,
	markCheckStatus,
	applyPhaseStatus,
	PHASE_RECON,
	PHASE_ANALYSIS,
	PHASE_FIX,
	PHASE_VERIFY,
	PHASE_CLEANUP,
} from "../src/run-state.js";
import { writeFile } from "node:fs/promises";

/** Build a deterministic check whose fake runner writes on-disk artifacts. */
function fakeCheck(name: string): CheckDefinition {
	return {
		name,
		label: name.charAt(0).toUpperCase() + name.slice(1),
		description: `${name} check`,
		agentName: "scanner",
		fixAgentName: "fixer",
		phaseId: "scan",
		buildScanTask: (_cwd, scope) =>
			`!write .pygienium/checks/${name}/findings.md # ${name} findings\nscan-target:${scope.target}\n!echo ${name}-scan`,
		buildFixTask: (_cwd, _scope, findings) =>
			`!write .pygienium/checks/${name}/changes.md # ${name} changes\nbased-on:${findings.split("\n")[0] ?? ""}\n!echo ${name}-fix`,
		gate: () => undefined,
	};
}

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

/** Tracker: records dispatched agent tasks then delegates to the fake runner. */
function trackingRunner(): { runner: AgentRunner; dispatched: string[] } {
	const dispatched: string[] = [];
	const runner: AgentRunner = async (opts) => {
		const m = /pygienium\/checks\/([^/]+)\//.exec(opts.task);
		if (m) dispatched.push(m[1] as string);
		return fakeAgentRunner(opts);
	};
	return { runner, dispatched };
}

/** Capture process.stdout.write lines for the duration of `fn`. */
async function captureStdout(fn: () => Promise<void>): Promise<string[]> {
	const out: string[] = [];
	const write = process.stdout.write.bind(process.stdout);
	(process.stdout as { write: (chunk: unknown) => boolean }).write = (
		chunk: unknown,
	) => {
		out.push(String(chunk).replace(/\r?\n$/, ""));
		return true;
	};
	try {
		await fn();
	} finally {
		(process.stdout as { write: (chunk: unknown) => boolean }).write = write;
	}
	return out;
}

/** Mark a check as fully complete in the run-state (helper for seeding). */
function markComplete(
	state: Parameters<typeof markCheckStatus>[0],
	name: string,
): void {
	for (const phaseId of [
		PHASE_RECON,
		PHASE_ANALYSIS,
		PHASE_FIX,
		PHASE_VERIFY,
		PHASE_CLEANUP,
	]) {
		applyPhaseStatus(state, name, phaseId, "complete");
	}
	markCheckStatus(state, name, "complete");
}

describe("/pygienium-all orchestrator (task 12)", () => {
	let cwd: string;
	let track: ReturnType<typeof trackingRunner>;

	beforeEach(async () => {
		clearChecks();
		track = trackingRunner();
		setAgentRunner(track.runner);
		cwd = await mkdtemp(join(tmpdir(), "pygienium-all-"));
		// Seed a source file so the gate passes and recon has something to scan.
		await mkdir(join(cwd, "src"), { recursive: true });
	});

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

	it("parseAllArgs parses path, --fix, --fresh, --no-gitignore, and --only", () => {
		const p = parseAllArgs("subdir --fix --only=alpha,beta --fresh", cwd);
		expect(p.target).toBe(join(cwd, "subdir"));
		expect(p.fix).toBe(true);
		expect(p.fresh).toBe(true);
		expect(p.gitignore).toBe(true); // default: keep the .gitignore guard on
		expect(p.only).toEqual(["alpha", "beta"]);
		const noGi = parseAllArgs("--no-gitignore", cwd);
		expect(noGi.gitignore).toBe(false);
		expect(noGi.target).toBe(cwd);
	});

	it("selectChecks preserves registry order for the --only subset", () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		registerCheck(fakeCheck("gamma"));
		const subset = selectChecks(["gamma", "alpha"]); // order in --only is irrelevant
		expect(subset.map((c) => c.name)).toEqual(["alpha", "gamma"]);
		expect(selectChecks().length).toBe(3);
		expect(selectChecks([]).length).toBe(3);
	});

	it("runs every registered check exactly once in registry order", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		registerCheck(fakeCheck("gamma"));

		await captureStdout(() => handleAllCommand("--fix", stubCtx(cwd)));

		// Each check dispatched once for scan + once for fix (3 checks × 2 phases).
		const scanDispatches = track.dispatched.filter((n) => n !== undefined);
		expect(scanDispatches).toEqual([
			"alpha",
			"alpha",
			"beta",
			"beta",
			"gamma",
			"gamma",
		]);

		const state = await loadRunState(cwd);
		expect(state?.status).toBe("complete");
		expect(state?.checks.alpha.status).toBe("complete");
		expect(state?.checks.beta.status).toBe("complete");
		expect(state?.checks.gamma.status).toBe("complete");
		expect(state?.recon.complete).toBe(true);
	});

	it("writes .pygienium/all-summary.md listing per-check outcomes", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));

		await captureStdout(() => handleAllCommand("--fix", stubCtx(cwd)));

		const summary = await readFile(allSummaryPath(cwd), "utf8");
		expect(summary).toContain("# Pygienium all-run summary");
		expect(summary).toContain("- status: complete");
		expect(summary).toContain("## alpha — complete");
		expect(summary).toContain("## beta — complete");
		expect(summary).toContain("## alpha — complete (--fix)");
		// Artifact paths + line counts are referenced.
		expect(summary).toContain("findings:");
		expect(summary).toContain("changes:");
		// Artifacts actually exist on disk.
		const alphaFindings = await readFile(
			join(cwd, ".pygienium", "checks", "alpha", "findings.md"),
			"utf8",
		);
		expect(alphaFindings).toContain("alpha findings");
	});

	it("--only narrows the run to the named subset", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		registerCheck(fakeCheck("gamma"));

		await captureStdout(() =>
			handleAllCommand("--only=alpha,gamma", stubCtx(cwd)),
		);

		// Only alpha + gamma dispatched (beta never touched).
		expect(track.dispatched).toContain("alpha");
		expect(track.dispatched).toContain("gamma");
		expect(track.dispatched).not.toContain("beta");

		const state = await loadRunState(cwd);
		expect(state?.checks.alpha.status).toBe("complete");
		expect(state?.checks.gamma.status).toBe("complete");
		// beta was not part of the selected set, so has no entry.
		expect(state?.checks.beta).toBeUndefined();

		const summary = await readFile(allSummaryPath(cwd), "utf8");
		expect(summary).toContain("## alpha");
		expect(summary).toContain("## gamma");
		expect(summary).not.toContain("## beta");
	});

	it("skips terminal checks on re-run; --fresh re-runs them", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));

		// First run: both complete.
		await captureStdout(() => handleAllCommand("--fix", stubCtx(cwd)));
		expect(track.dispatched.length).toBe(4); // 2 checks × 2 phases
		const firstAlphaFix = await readFile(
			join(cwd, ".pygienium", "checks", "alpha", "changes.md"),
			"utf8",
		);

		// Second run without --fresh: both already terminal → skipped.
		track.dispatched.length = 0;
		const out = await captureStdout(() =>
			handleAllCommand("--fix", stubCtx(cwd)),
		);
		expect(track.dispatched).toHaveLength(0);
		expect(out.join("\n")).toContain("skipping");
		const state2 = await loadRunState(cwd);
		expect(state2?.status).toBe("complete");

		// Third run with --fresh: both re-dispatched from scratch.
		track.dispatched.length = 0;
		await captureStdout(() => handleAllCommand("--fix --fresh", stubCtx(cwd)));
		expect(track.dispatched).toEqual(["alpha", "alpha", "beta", "beta"]);
		const state3 = await loadRunState(cwd);
		expect(state3?.status).toBe("complete");
		// The fresh re-run overwrote alpha's changes.md (still valid content).
		const alphaFix2 = await readFile(
			join(cwd, ".pygienium", "checks", "alpha", "changes.md"),
			"utf8",
		);
		expect(alphaFix2).toContain("alpha changes");
		void firstAlphaFix;
	});

	it("resumes an interrupted run (re-dispatches non-terminal checks only)", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));

		// Seed an interrupted run: alpha complete, beta pending (interrupted).
		const { initRunState, saveRunState } = await import("../src/run-state.js");
		const state = initRunState(cwd, [
			{ name: "alpha", label: "alpha", fix: true },
			{ name: "beta", label: "beta", fix: true },
		]);
		state.recon = {
			complete: true,
			path: join(cwd, ".pygienium", "recon.json"),
			finishedAt: Date.now(),
		};
		// Pre-create alpha's on-disk artifacts so its completed entry has artifacts.
		const alphaDir = join(cwd, ".pygienium", "checks", "alpha");
		await mkdir(alphaDir, { recursive: true });
		await writeFile(
			join(alphaDir, "findings.md"),
			"# alpha findings\nalpha-scan\n",
		);
		await writeFile(
			join(alphaDir, "changes.md"),
			"# alpha changes\nalpha-fix\n",
		);
		markComplete(state, "alpha");
		// beta was interrupted mid-analysis — left at in_progress.
		applyPhaseStatus(state, "beta", PHASE_RECON, "complete");
		applyPhaseStatus(state, "beta", PHASE_ANALYSIS, "in_progress");
		await saveRunState(state);

		// Resume via all-run: only beta should re-dispatch.
		const out = await captureStdout(() =>
			handleAllCommand("--fix", stubCtx(cwd)),
		);
		expect(track.dispatched).not.toContain("alpha");
		expect(track.dispatched).toContain("beta");
		expect(out.join("\n")).toContain("skipping");

		const after = await loadRunState(cwd);
		expect(after?.status).toBe("complete");
		expect(after?.checks.alpha.status).toBe("complete");
		expect(after?.checks.beta.status).toBe("complete");
	});

	it("runAllChecks supports scan-only (no fix phase, no changes artifacts)", async () => {
		registerCheck(fakeCheck("alpha"));
		const outcome = await runAllChecks({ cwd });
		expect(outcome.ran).toEqual(["alpha"]);
		expect(outcome.skipped).toEqual([]);
		expect(outcome.status).toBe("complete");
		const state = await loadRunState(cwd);
		expect(state?.checks.alpha.fix).toBe(false);
		expect(state?.checks.alpha.changes).toBeUndefined();
		// Summary still written.
		const summary = await readFile(outcome.summaryPath, "utf8");
		expect(summary).toContain("## alpha — complete");
		expect(outcome.summaryPath).toBe(allSummaryPath(cwd));
	});

	it("renders a summary even when no checks are registered/selected", async () => {
		const outcome = await runAllChecks({ cwd, only: ["nonexistent"] });
		expect(outcome.ran).toEqual([]);
		const summary = await readFile(outcome.summaryPath, "utf8");
		expect(summary).toContain("# Pygienium all-run summary");
		expect(summary).toContain("- checks: 0");
	});

	it("renderAllSummary reflects per-check statuses and fix tags", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		await runAllChecks({ cwd, fix: true });
		const state = (await loadRunState(cwd))!;
		const md = renderAllSummary(state, selectChecks());
		expect(md).toContain("## alpha — complete (--fix)");
		expect(md).toContain("phases: recon:C");
	});

	it("the unified strip surfaces every check name over the run", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		const out = await captureStdout(() => handleAllCommand("", stubCtx(cwd)));
		const joined = out.join("\n");
		// Each check name appears in the strip line at least once.
		expect(joined).toContain("Alpha");
		expect(joined).toContain("Beta");
		expect(joined).toContain("all [");
	});

	it("renders only the unified widget in UI mode (no per-check spinner)", async () => {
		registerCheck(fakeCheck("alpha"));
		registerCheck(fakeCheck("beta"));
		const calls: Array<[string, string[] | undefined]> = [];
		const ui = {
			setWidget: (key: string, content: string[] | undefined) => {
				calls.push([key, content]);
			},
		} as never; // stub ExtensionUIContext (tests have no pi type imports)

		await runAllChecks({ cwd, ui, hasUI: true });

		const keys = new Set(calls.map(([k]) => k));
		// The unified strip drives the widget area…
		expect(keys.has("pygienium-all-progress")).toBe(true);
		// …and per-check strips never claim it, so no second spinner can
		// flicker/swap against the unified one.
		expect(keys.has("pygienium-progress")).toBe(false);
		// The widget is cleared when the run completes.
		const last = calls[calls.length - 1]!;
		expect(last[0]).toBe("pygienium-all-progress");
		expect(last[1]).toBeUndefined();
	});
});