package main

import (
	"bytes"
	"os"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestExecuteTypeScript(t *testing.T) {
	var stdout, stderr bytes.Buffer

	err := executeTypeScript("test_data/test.ts", &stdout, &stderr)

	assert.NoError(t, err, "Expected no error")
	assert.Empty(t, stderr.String(), "Expected no error output")

	output := stdout.String()

	assert.Contains(t, output, "Hello, Alice!", "Should greet Alice")
	assert.Contains(t, output, "You are 30 years old", "Should show age")
	assert.Contains(t, output, "Email: alice@example.com", "Should show email")
	assert.Contains(t, output, "Sum of 5 and 10 is: 15", "Should calculate sum correctly")

	lines := strings.Split(strings.TrimSpace(output), "\n")
	assert.GreaterOrEqual(t, len(lines), 3, "Should have at least 3 output lines")
}

func TestExecuteTypeScriptWithNonExistentFile(t *testing.T) {
	var stdout, stderr bytes.Buffer

	err := executeTypeScript("non_existent_file.ts", &stdout, &stderr)

	assert.Error(t, err, "Expected error for non-existent file")
	assert.Contains(t, stderr.String(), "Error reading file", "Should show read error")
}

func TestExecuteTypeScriptWithSyntaxError(t *testing.T) {
	var stdout, stderr bytes.Buffer

	tsContent := `
		interface Person {
			name: string;
			age: number;
		}
		
		const user: Person = {
			name: "Bob",
			age: 25,
		};
		
		console.log(user.name)
		console.log(user.age +);
	`

	err := os.WriteFile("test_data/invalid.ts", []byte(tsContent), 0644)
	if err != nil {
		t.Fatalf("Failed to write test file: %v", err)
	}
	defer func() {
		_ = os.Remove("test_data/invalid.ts")
	}()

	err = executeTypeScript("test_data/invalid.ts", &stdout, &stderr)

	assert.Error(t, err, "Expected error for invalid TypeScript")
}