import io.swtc.networking.CameraConfig;
import io.swtc.networking.CameraSettings;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

class CameraSettingsTest {

    // Must match the filename used in CameraSettings.java
    private final File TEST_FILE = new File("network_cameras.json");

    @BeforeEach
    @AfterEach
    void cleanUp() {
        // Ensure we start and end with a clean slate to avoid side effects
        if (TEST_FILE.exists()) {
            TEST_FILE.delete();
        }
    }

    @Test
    void testLoadReturnsEmptyListWhenNoFile() {
        // If the file doesn't exist, it should return an empty list (not null)
        List<CameraConfig> result = CameraSettings.load();

        assertNotNull(result, "Load should never return null");
        assertTrue(result.isEmpty(), "Should return empty list if file doesn't exist");
    }

    @Test
    void testSaveAndLoad() {
        // 1. Create a config (Using your actual constructor)
        CameraConfig config = new CameraConfig("FrontDoor", "http://192.168.1.100/mjpeg");

        // 2. Save it
        CameraSettings.save(config);

        // 3. Verify file creation
        assertTrue(TEST_FILE.exists(), "File should be created after save");

        // 4. Load it back
        List<CameraConfig> loaded = CameraSettings.load();

        // 5. Verify contents
        assertEquals(1, loaded.size());
        assertEquals("FrontDoor", loaded.get(0).getName());
        assertEquals("http://192.168.1.100/mjpeg", loaded.get(0).getUrl());
    }

    @Test
    void testSaveMultiple() {
        // Save two distinct cameras
        CameraSettings.save(new CameraConfig("Cam1", "rtsp://10.0.0.1/stream"));
        CameraSettings.save(new CameraConfig("Cam2", "rtsp://10.0.0.2/stream"));

        List<CameraConfig> loaded = CameraSettings.load();

        assertEquals(2, loaded.size());
        assertEquals("Cam1", loaded.get(0).getName());
        assertEquals("Cam2", loaded.get(1).getName());
    }

    @Test
    void testDelete() {
        // Setup: Save two cameras
        CameraSettings.save(new CameraConfig("Garage", "http://1.1.1.1"));
        CameraSettings.save(new CameraConfig("Garden", "http://2.2.2.2"));

        // Action: Delete "Garage"
        CameraSettings.delete("Garage");

        // Verify: Only "Garden" remains
        List<CameraConfig> result = CameraSettings.load();
        assertEquals(1, result.size());
        assertEquals("Garden", result.get(0).getName());
    }

    @Test
    void testLoadCorruptFile() throws IOException {
        // Manually write broken JSON to the file
        try (FileWriter writer = new FileWriter(TEST_FILE)) {
            writer.write("{ \"this is broken json\": ... ");
        }

        // The code catches IOException and returns empty list
        List<CameraConfig> result = CameraSettings.load();

        assertNotNull(result);
        assertTrue(result.isEmpty(), "Should handle corrupt JSON gracefully by returning empty list");
    }
}