import { describe, expect, test } from "bun:test";
import { parseTscOutput } from "./tsc-check";

describe("parseTscOutput", () => {
	test("parses single error correctly", () => {
		const output = `src/index.ts(10,5): error TS2322: Type 'string' is not assignable to type 'number'.`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(1);
		expect(result.errors).toHaveLength(1);
		expect(result.errors[0]).toEqual({
			file: "src/index.ts",
			line: 10,
			col: 5,
			message: "Type 'string' is not assignable to type 'number'.",
		});
	});

	test("parses multiple errors correctly", () => {
		const output = `src/utils.ts(5,10): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
src/utils.ts(12,3): error TS2304: Cannot find name 'foo'.
src/index.ts(1,1): error TS2307: Cannot find module './missing'.`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(3);
		expect(result.errors).toHaveLength(3);
		expect(result.errors[0]?.file).toBe("src/utils.ts");
		expect(result.errors[0]?.line).toBe(5);
		expect(result.errors[1]?.file).toBe("src/utils.ts");
		expect(result.errors[1]?.line).toBe(12);
		expect(result.errors[2]?.file).toBe("src/index.ts");
	});

	test("handles empty output", () => {
		const result = parseTscOutput("");

		expect(result.errorCount).toBe(0);
		expect(result.errors).toHaveLength(0);
	});

	test("handles output with no errors", () => {
		const output = `Some random output
that is not an error
just informational text`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(0);
		expect(result.errors).toHaveLength(0);
	});

	test("handles Windows-style paths", () => {
		const output = `C:\\Users\\dev\\project\\src\\index.ts(5,10): error TS2322: Type error.`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(1);
		expect(result.errors[0]?.file).toBe(
			"C:\\Users\\dev\\project\\src\\index.ts",
		);
	});

	test("parses errors with complex messages", () => {
		const output = `src/types.ts(15,3): error TS2739: Type '{ name: string; }' is missing the following properties from type 'User': id, email, createdAt`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(1);
		expect(result.errors[0]?.message).toBe(
			"Type '{ name: string; }' is missing the following properties from type 'User': id, email, createdAt",
		);
	});

	test("ignores warning lines", () => {
		// TSC doesn't output warnings in this format, but ensure we only match errors
		const output = `src/index.ts(10,5): error TS2322: This is an error.
src/index.ts(20,5): warning TS6789: This would be a warning if TSC had them.`;

		const result = parseTscOutput(output);

		expect(result.errorCount).toBe(1);
		expect(result.errors[0]?.line).toBe(10);
	});
});