import test from "node:test";
import assert from "node:assert/strict";

import { patchPiSubagentsSource, stripPiSubagentBuiltinModelSource } from "../scripts/lib/pi-subagents-patch.mjs";

const CASES = [
	{
		name: "index.ts config path",
		file: "index.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const configPath = path.join(os.homedir(), ".pi", "agent", "extensions", "subagent", "config.json");',
			"",
		].join("\n"),
		original: 'const configPath = path.join(os.homedir(), ".pi", "agent", "extensions", "subagent", "config.json");',
		expected: 'const configPath = path.join(resolvePiAgentDir(), "extensions", "subagent", "config.json");',
	},
	{
		name: "agents.ts user agents dir",
		file: "agents.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const userDir = path.join(os.homedir(), ".pi", "agent", "agents");',
			"",
		].join("\n"),
		original: 'const userDir = path.join(os.homedir(), ".pi", "agent", "agents");',
		expected: 'const userDir = path.join(resolvePiAgentDir(), "agents");',
	},
	{
		name: "artifacts.ts sessions dir",
		file: "artifacts.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const sessionsBase = path.join(os.homedir(), ".pi", "agent", "sessions");',
			"",
		].join("\n"),
		original: 'const sessionsBase = path.join(os.homedir(), ".pi", "agent", "sessions");',
		expected: 'const sessionsBase = path.join(resolvePiAgentDir(), "sessions");',
	},
	{
		name: "run-history.ts history file",
		file: "run-history.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const HISTORY_PATH = path.join(os.homedir(), ".pi", "agent", "run-history.jsonl");',
			"",
		].join("\n"),
		original: 'const HISTORY_PATH = path.join(os.homedir(), ".pi", "agent", "run-history.jsonl");',
		expected: 'const HISTORY_PATH = path.join(resolvePiAgentDir(), "run-history.jsonl");',
	},
	{
		name: "skills.ts agent dir",
		file: "skills.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const AGENT_DIR = path.join(os.homedir(), ".pi", "agent");',
			"",
		].join("\n"),
		original: 'const AGENT_DIR = path.join(os.homedir(), ".pi", "agent");',
		expected: "const AGENT_DIR = resolvePiAgentDir();",
	},
	{
		name: "chain-clarify.ts chain save dir",
		file: "chain-clarify.ts",
		input: [
			'import * as os from "node:os";',
			'import * as path from "node:path";',
			'const dir = path.join(os.homedir(), ".pi", "agent", "agents");',
			"",
		].join("\n"),
		original: 'const dir = path.join(os.homedir(), ".pi", "agent", "agents");',
		expected: 'const dir = path.join(resolvePiAgentDir(), "agents");',
	},
];

for (const scenario of CASES) {
	test(`patchPiSubagentsSource rewrites ${scenario.name}`, () => {
		const patched = patchPiSubagentsSource(scenario.file, scenario.input);

		assert.match(patched, /function resolvePiAgentDir\(\): string \{/);
		assert.match(patched, /process\.env\.PI_CODING_AGENT_DIR\?\.trim\(\)/);
		assert.ok(patched.includes(scenario.expected));
		assert.ok(!patched.includes(scenario.original));
	});
}

test("patchPiSubagentsSource is idempotent", () => {
	const input = [
		'import * as os from "node:os";',
		'import * as path from "node:path";',
		'const configPath = path.join(os.homedir(), ".pi", "agent", "extensions", "subagent", "config.json");',
		"",
	].join("\n");

	const once = patchPiSubagentsSource("index.ts", input);
	const twice = patchPiSubagentsSource("index.ts", once);

	assert.equal(twice, once);
});

test("patchPiSubagentsSource rewrites modern agents.ts discovery paths", () => {
	const input = [
		'import * as fs from "node:fs";',
		'import * as os from "node:os";',
		'import * as path from "node:path";',
		'export function discoverAgents(cwd: string, scope: AgentScope): AgentDiscoveryResult {',
		'\tconst userDirOld = path.join(os.homedir(), ".pi", "agent", "agents");',
		'\tconst userDirNew = path.join(os.homedir(), ".agents");',
		'\tconst userAgentsOld = scope === "project" ? [] : loadAgentsFromDir(userDirOld, "user");',
		'\tconst userAgentsNew = scope === "project" ? [] : loadAgentsFromDir(userDirNew, "user");',
		'\tconst userAgents = [...userAgentsOld, ...userAgentsNew];',
		'}',
		'export function discoverAgentsAll(cwd: string) {',
		'\tconst userDirOld = path.join(os.homedir(), ".pi", "agent", "agents");',
		'\tconst userDirNew = path.join(os.homedir(), ".agents");',
		'\tconst user = [',
		'\t\t...loadAgentsFromDir(userDirOld, "user"),',
		'\t\t...loadAgentsFromDir(userDirNew, "user"),',
		'\t];',
		'\tconst chains = [',
		'\t\t...loadChainsFromDir(userDirOld, "user"),',
		'\t\t...loadChainsFromDir(userDirNew, "user"),',
		'\t\t...(projectDir ? loadChainsFromDir(projectDir, "project") : []),',
		'\t];',
		'\tconst userDir = fs.existsSync(userDirNew) ? userDirNew : userDirOld;',
		'}',
	].join("\n");

	const patched = patchPiSubagentsSource("agents.ts", input);

	assert.match(patched, /function resolvePiAgentDir\(\): string \{/);
	assert.match(patched, /const userDir = path\.join\(resolvePiAgentDir\(\), "agents"\);/);
	assert.match(patched, /const userAgents = scope === "project" \? \[\] : loadAgentsFromDir\(userDir, "user"\);/);
	assert.ok(!patched.includes('loadAgentsFromDir(userDirOld, "user")'));
	assert.ok(!patched.includes('loadChainsFromDir(userDirNew, "user")'));
	assert.ok(!patched.includes('fs.existsSync(userDirNew) ? userDirNew : userDirOld'));
});

test("stripPiSubagentBuiltinModelSource removes built-in model pins", () => {
	const input = [
		"---",
		"name: researcher",
		"description: Web researcher",
		"model: anthropic/claude-sonnet-4-6",
		"tools: read, web_search",
		"---",
		"",
		"Body",
	].join("\n");

	const patched = stripPiSubagentBuiltinModelSource(input);

	assert.ok(!patched.includes("model: anthropic/claude-sonnet-4-6"));
	assert.match(patched, /name: researcher/);
	assert.match(patched, /tools: read, web_search/);
});