import { afterEach, describe, expect, it } from "bun:test";
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import { filterProcessEnv, getDbBusyTimeoutMs, parseEnvFile, setInteractiveHost } from "@oh-my-pi/pi-utils/env";

const tempDirs: string[] = [];
const runtimeProbePath = path.join(import.meta.dir, "fixtures", "test-runtime-probe.ts");

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

function writeTempEnv(content: string): string {
	const dir = fs.mkdtempSync(path.join(os.tmpdir(), "pi-utils-env-"));
	tempDirs.push(dir);
	const filePath = path.join(dir, ".env");
	fs.writeFileSync(filePath, content);
	return filePath;
}

describe("getDbBusyTimeoutMs", () => {
	it("defaults to the bounded headless timeout", () => {
		const previous = setInteractiveHost(false);
		try {
			expect(getDbBusyTimeoutMs()).toBe(1000);
		} finally {
			setInteractiveHost(previous);
		}
	});

	it("keeps the interactive timeout for interactive hosts", () => {
		const previous = setInteractiveHost(true);
		try {
			expect(getDbBusyTimeoutMs()).toBe(5000);
		} finally {
			setInteractiveHost(previous);
		}
	});
});
async function runRuntimeProbe(
	env: Record<string, string | undefined>,
	probePath = runtimeProbePath,
): Promise<boolean> {
	const cwd = path.dirname(writeTempEnv(""));
	const proc = Bun.spawn([process.execPath, probePath], {
		cwd,
		env: { ...process.env, ...env },
		stdout: "pipe",
		stderr: "pipe",
	});
	const [stdout, stderr, exitCode] = await Promise.all([
		new Response(proc.stdout).text(),
		new Response(proc.stderr).text(),
		proc.exited,
	]);
	expect(exitCode, stderr).toBe(0);
	return JSON.parse(stdout) as boolean;
}

describe("parseEnvFile", () => {
	it("ignores malformed names and nul-containing values", () => {
		const filePath = writeTempEnv(
			[
				"GOOD=value",
				"_ALSO_GOOD='quoted value'",
				"1BAD=value",
				"BAD-NAME=value",
				"BAD NAME=value",
				"BAD_VALUE=before\0after",
				"# comment",
				"NO_EQUALS",
			].join("\n"),
		);

		expect(parseEnvFile(filePath)).toEqual({
			GOOD: "value",
			_ALSO_GOOD: "quoted value",
		});
	});

	it("mirrors valid OMP_ variables to PI_ variables", () => {
		const filePath = writeTempEnv("OMP_FEATURE=enabled\nOMP_BAD=before\0after\n");

		expect(parseEnvFile(filePath)).toEqual({
			OMP_FEATURE: "enabled",
			PI_FEATURE: "enabled",
		});
	});

	it("matches Bun dotenv syntax for export prefixes and inline comments", () => {
		const filePath = writeTempEnv(
			[
				"export EXPORTED=value",
				"COMMENTED=secret # trailing comment",
				'QUOTED_HASH="keep # this"',
				"NO_SPACE=http://host/path#frag",
			].join("\n"),
		);

		expect(parseEnvFile(filePath)).toEqual({
			EXPORTED: "value",
			COMMENTED: "secret",
			QUOTED_HASH: "keep # this",
			NO_SPACE: "http://host/path#frag",
		});
	});

	it("keeps escaped quotes inside quoted values literal, matching Bun", () => {
		const filePath = writeTempEnv(['JSON="{\\"a\\":1}"', "SINGLE='it\\'s'"].join("\n"));

		expect(parseEnvFile(filePath)).toEqual({
			JSON: '{\\"a\\":1}',
			SINGLE: "it\\'s",
		});
	});
});

describe("filterProcessEnv", () => {
	it("drops entries that cannot be passed to process spawn env", () => {
		expect(
			filterProcessEnv({
				GOOD: "value",
				EMPTY: "",
				"BAD=NAME": "value",
				BAD_VALUE: "before\0after",
				MISSING: undefined,
			}),
		).toEqual({
			GOOD: "value",
			EMPTY: "",
		});
	});

	it("drops macOS malloc stack logging toggles instead of forwarding disabled values", () => {
		expect(
			filterProcessEnv({
				GOOD: "value",
				MallocStackLogging: "0",
				MallocStackLoggingNoCompact: "0",
			}),
		).toEqual({
			GOOD: "value",
		});
	});

	it("preserves Windows-style variable names containing parentheses", () => {
		// `ProgramFiles(x86)` and friends are standard on Windows and must
		// survive the scrub so Git Bash discovery in procmgr.ts can resolve
		// 32-bit Program Files installations.
		expect(
			filterProcessEnv({
				"ProgramFiles(x86)": "C:\\Program Files (x86)",
				"CommonProgramFiles(x86)": "C:\\Program Files (x86)\\Common Files",
			}),
		).toEqual({
			"ProgramFiles(x86)": "C:\\Program Files (x86)",
			"CommonProgramFiles(x86)": "C:\\Program Files (x86)\\Common Files",
		});
	});
});

describe("isBunTestRuntime", () => {
	it("does not treat shared application env names as a test runner signal", async () => {
		expect(await runRuntimeProbe({ NODE_ENV: "test", BUN_ENV: undefined, PI_TEST_RUNTIME: undefined })).toBe(false);
		expect(await runRuntimeProbe({ NODE_ENV: undefined, BUN_ENV: "test", PI_TEST_RUNTIME: undefined })).toBe(false);
	});

	it("honors the private test runner signal", async () => {
		expect(await runRuntimeProbe({ NODE_ENV: undefined, BUN_ENV: undefined, PI_TEST_RUNTIME: "1" })).toBe(true);
	});

	it("recognizes Bun's underscore test entrypoints", async () => {
		const dir = path.dirname(writeTempEnv(""));
		const underscoreProbePath = path.join(dir, "runtime_test.ts");
		const envModulePath = path.join(import.meta.dir, "..", "src", "env.ts");
		fs.writeFileSync(
			underscoreProbePath,
			`import { isBunTestRuntime } from ${JSON.stringify(envModulePath)};\nprocess.stdout.write(JSON.stringify(isBunTestRuntime()));\n`,
		);
		expect(
			await runRuntimeProbe(
				{ NODE_ENV: "test", BUN_ENV: undefined, PI_TEST_RUNTIME: undefined },
				underscoreProbePath,
			),
		).toBe(true);
	});
});