/**
 * run-state.test.ts — run-state reconciliation, error hygiene, and the
 * .gitignore guard (issues surfaced by the MagnaFluo all-run: "partial" for
 * all-failed runs, stale errors on completed checks, staged artifacts).
 */
import { describe, expect, it, beforeEach, afterEach } from "bun:test";
import { mkdtemp, mkdir, readFile, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import {
	ensureRunStateIgnored,
	initRunState,
	markCheckStatus,
	reconcileRunStatus,
} from "../src/run-state.js";

/** Build a run state whose checks carry the given statuses. */
function stateWith(
	...statuses: Array<[name: string, status: string]>
): ReturnType<typeof initRunState> {
	const state = initRunState(
		"/virtual/cwd",
		statuses.map(([name]) => ({ name, label: name })),
	);
	for (const [name, status] of statuses) {
		markCheckStatus(
			state,
			name,
			status as "complete" | "failed" | "skipped",
			status === "failed" ? "boom" : undefined,
		);
	}
	return state;
}

describe("reconcileRunStatus", () => {
	it("is in_progress while nothing is terminal", () => {
		expect(reconcileRunStatus(stateWith())).toBe("in_progress");
		expect(
			reconcileRunStatus(initRunState("/virt", [{ name: "a", label: "a" }])),
		).toBe("in_progress");
	});

	it("is complete only when every check is complete", () => {
		expect(
			reconcileRunStatus(stateWith(["a", "complete"], ["b", "complete"])),
		).toBe("complete");
	});

	it("is partial when some checks failed and others completed", () => {
		expect(
			reconcileRunStatus(stateWith(["a", "complete"], ["b", "failed"])),
		).toBe("partial");
	});

	it("is partial when checks were skipped", () => {
		expect(
			reconcileRunStatus(stateWith(["a", "complete"], ["b", "skipped"])),
		).toBe("partial");
	});

	it("is failed when every check failed (not partial)", () => {
		expect(
			reconcileRunStatus(stateWith(["a", "failed"], ["b", "failed"])),
		).toBe("failed");
		expect(reconcileRunStatus(stateWith(["a", "failed"]))).toBe("failed");
	});

	it("is partial for a mixed failed/skipped run (some degraded, none ok)", () => {
		expect(
			reconcileRunStatus(stateWith(["a", "failed"], ["b", "skipped"])),
		).toBe("partial");
	});
});

describe("check error hygiene", () => {
	it("a failed check records its error", () => {
		const s = stateWith(["a", "failed"]);
		expect(s.checks.a?.error).toBe("boom");
	});

	it("a later success clears the stale error (resume-complete invariant)", () => {
		const s = stateWith(["a", "failed"]);
		expect(s.checks.a?.error).toBe("boom");
		markCheckStatus(s, "a", "complete");
		expect(s.checks.a?.error).toBeUndefined();
		expect(s.checks.a?.status).toBe("complete");
	});
});

describe("ensureRunStateIgnored", () => {
	let cwd: string;
	beforeEach(async () => {
		cwd = await mkdtemp(join(tmpdir(), "pygium-git-"));
		await mkdir(join(cwd, ".git"), { recursive: true }); // pretend it's a work tree
	});
	afterEach(async () => {
		await rm(cwd, { recursive: true, force: true });
	});

	it("creates .gitignore with .pygienium/ when absent", async () => {
		expect(await ensureRunStateIgnored(cwd)).toBe(true);
		const content = await readFile(join(cwd, ".gitignore"), "utf8");
		expect(content).toContain(".pygienium/");
	});

	it("appends to an existing .gitignore without the marker", async () => {
		await writeFile(join(cwd, ".gitignore"), "node_modules/\n", "utf8");
		expect(await ensureRunStateIgnored(cwd)).toBe(true);
		const content = await readFile(join(cwd, ".gitignore"), "utf8");
		expect(content).toContain(".pygienium/");
		expect(content).toContain("node_modules/");
	});

	it("leaves an existing marker untouched and reports no change", async () => {
		await writeFile(
			join(cwd, ".gitignore"),
			".pygienium/\nnode_modules/\n",
			"utf8",
		);
		expect(await ensureRunStateIgnored(cwd)).toBe(false);
		const content = await readFile(join(cwd, ".gitignore"), "utf8");
		expect(content).toBe(".pygienium/\nnode_modules/\n");
	});

	it("is a no-op outside a git work tree", async () => {
		const plain = await mkdtemp(join(tmpdir(), "pygium-nogit-"));
		try {
			expect(await ensureRunStateIgnored(plain)).toBe(false);
			await expect(
				readFile(join(plain, ".gitignore"), "utf8"),
			).rejects.toThrow();
		} finally {
			await rm(plain, { recursive: true, force: true });
		}
	});
});