import { beforeAll, describe, expect, it } from "bun:test";
import * as fs from "node:fs/promises";
import * as os from "node:os";
import * as path from "node:path";
import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
import { assertEditableFile, assertEditableFileContent } from "@oh-my-pi/pi-coding-agent/tools/auto-generated-guard";
import { ToolError } from "@oh-my-pi/pi-coding-agent/tools/tool-errors";

let tempDir: string;

beforeAll(async () => {
	resetSettingsForTest();
	tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "auto-gen-guard-"));
	await Settings.init({ inMemory: true, cwd: tempDir });
});

describe("assertEditableFileContent", () => {
	it("detects canonical TypeScript generated header", () => {
		const content = "// Code generated by sqlc. DO NOT EDIT.\n\nexport const foo = 1;";
		expect(() => assertEditableFileContent(content, "test.ts")).toThrow(ToolError);
	});

	it("detects @generated marker", () => {
		const content = "// @generated\n\nexport const foo = 1;";
		expect(() => assertEditableFileContent(content, "test.ts")).toThrow(ToolError);
	});

	it("detects generated-by marker for Python files", () => {
		const content = "# Generated by buf\n\nvalue = 1";
		expect(() => assertEditableFileContent(content, "test.py")).toThrow(ToolError);
	});

	it("detects generated-by marker for SQL files", () => {
		const content = "-- generated by sqlc\n\nselect 1;";
		expect(() => assertEditableFileContent(content, "query.sql")).toThrow(ToolError);
	});

	it("detects generated markers in leading block comments", () => {
		const content = "/*\n * Code generated by mockery. DO NOT EDIT.\n */\nexport const foo = 1;";
		expect(() => assertEditableFileContent(content, "test.ts")).toThrow(ToolError);
	});

	it("detects kysely-codegen generated header", () => {
		const content =
			"/**\n * This file was generated by kysely-codegen.\n * Please do not edit it manually.\n */\n\nexport interface Database {}";
		expect(() => assertEditableFileContent(content, "db.ts")).toThrow(ToolError);
	});
});

describe("assertEditableFile", () => {
	it("detects content marker from file prefix", async () => {
		const filePath = path.join(tempDir, "service.ts");
		await Bun.write(filePath, "// Code generated by sqlc. DO NOT EDIT.\nexport const foo = 1;");
		await expect(assertEditableFile(filePath)).rejects.toBeInstanceOf(ToolError);
	});

	it("allows normal files", async () => {
		const filePath = path.join(tempDir, "normal.ts");
		await Bun.write(filePath, "// Regular source file\nexport const foo = 1;");
		await expect(assertEditableFile(filePath)).resolves.toBeUndefined();
	});

	it("handles missing files gracefully", async () => {
		const filePath = path.join(tempDir, "does-not-exist.ts");
		await expect(assertEditableFile(filePath)).resolves.toBeUndefined();
	});
});