"""Tests for the LanguageDetector module."""

import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent / 'src'))

from gdiffer.language_detector import LanguageDetector, detect_language


class TestLanguageDetector:
    def test_detect_python_extension(self, language_detector):
        assert language_detector.detect_from_filename("test.py") == "python"
        assert language_detector.detect_from_filename("script.pyw") == "python"

    def test_detect_javascript_extension(self, language_detector):
        assert language_detector.detect_from_filename("app.js") == "javascript"
        assert language_detector.detect_from_filename("component.tsx") == "typescript"

    def test_detect_java_extension(self, language_detector):
        assert language_detector.detect_from_filename("Main.java") == "java"

    def test_detect_go_extension(self, language_detector):
        assert language_detector.detect_from_filename("main.go") == "go"

    def test_detect_rust_extension(self, language_detector):
        assert language_detector.detect_from_filename("lib.rs") == "rust"

    def test_detect_c_extensions(self, language_detector):
        assert language_detector.detect_from_filename("file.c") == "c"
        assert language_detector.detect_from_filename("source.cpp") == "cpp"

    def test_detect_ruby_extension(self, language_detector):
        assert language_detector.detect_from_filename("script.rb") == "ruby"

    def test_detect_php_extension(self, language_detector):
        assert language_detector.detect_from_filename("index.php") == "php"

    def test_detect_unknown_extension(self, language_detector):
        assert language_detector.detect_from_filename("file.xyz") is None
        assert language_detector.detect_from_filename("README") is None

    def test_detect_from_content_python(self, language_detector):
        code = """def hello():
    return "Hello"
"""
        assert language_detector.detect_from_content(code) == "python"

    def test_detect_from_content_javascript(self, language_detector):
        code = """function greet(name) {
    return "Hello";
}"""
        assert language_detector.detect_from_content(code) == "javascript"

    def test_detect_combined_filename_content(self, language_detector):
        result = language_detector.detect("test.py", "def hello(): pass")
        assert result == "python"

    def test_get_supported_languages(self, language_detector):
        languages = language_detector.get_supported_languages()
        assert "python" in languages
        assert "javascript" in languages
        assert "java" in languages

    def test_is_language_supported(self, language_detector):
        assert language_detector.is_language_supported("python")
        assert not language_detector.is_language_supported("brainfuck")


class TestDetectLanguageFunction:
    def test_detect_language_python(self):
        result = detect_language("script.py", "def test(): pass")
        assert result == "python"

    def test_detect_language_unknown(self):
        result = detect_language("file.xyz", "")
        assert result == "text" or result is None