package com.eactive.eai.custom.inflow;

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

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.http.ResponseEntity;
import org.springframework.test.util.ReflectionTestUtils;

import com.eactive.eai.manage.inflow.TargetMetricDTO;

/**
 * ClientInflowTargetMetricController 단위 테스트.
 *
 * <p>Spring MVC를 기동하지 않고 컨트롤러를 직접 인스턴스화하여
 * 응답 구조(success, data, count, message)를 검증한다.
 */
class ClientInflowTargetMetricControllerTest {

    private ClientInflowTargetMetricController controller;
    private ClientInflowTargetMetricService mockService;

    @BeforeEach
    void setUp() {
        controller  = new ClientInflowTargetMetricController();
        mockService = mock(ClientInflowTargetMetricService.class);
        ReflectionTestUtils.setField(controller, "metricService", mockService);
    }

    private TargetMetricDTO makeDTO(String targetId, String targetType,
                                    long allowed, long rejPs, long rejTh) {
        TargetMetricDTO dto = new TargetMetricDTO();
        dto.setTargetId(targetId);
        dto.setTargetType(targetType);
        dto.setActivate(true);
        dto.setAllowed(allowed);
        dto.setRejectedPerSecond(rejPs);
        dto.setRejectedThreshold(rejTh);
        long total = allowed + rejPs + rejTh;
        dto.setTotalRequests(total);
        dto.setRejectRatio(total > 0 ? (double)(rejPs + rejTh) / total * 100 : 0.0);
        return dto;
    }

    @SuppressWarnings("unchecked")
    private Map<String, Object> body(ResponseEntity<?> response) {
        return (Map<String, Object>) response.getBody();
    }

    // =========================================================================
    // 단일 조회
    // =========================================================================

    @Test
    void getClientMetric_found_successTrueAndDataPresent() {
        TargetMetricDTO dto = makeDTO("C1", "CLIENT", 300, 50, 20);
        when(mockService.getClientMetric("C1")).thenReturn(dto);

        Map<String, Object> body = body(controller.getClientMetric("C1"));

        assertEquals(Boolean.TRUE, body.get("success"));
        assertSame(dto, body.get("data"));
        assertFalse(body.containsKey("message"));
    }

    @Test
    void getClientMetric_notFound_successFalseWithMessage() {
        when(mockService.getClientMetric("GHOST")).thenReturn(null);

        Map<String, Object> body = body(controller.getClientMetric("GHOST"));

        assertEquals(Boolean.FALSE, body.get("success"));
        assertTrue(body.get("message").toString().contains("GHOST"));
    }

    // =========================================================================
    // 전체 조회
    // =========================================================================

    @Test
    void getAllClientMetrics_returnsListAndCount() {
        List<TargetMetricDTO> list = Arrays.asList(
            makeDTO("C1", "CLIENT", 100, 5, 5),
            makeDTO("C2", "CLIENT", 200, 0, 0),
            makeDTO("C3", "CLIENT", 50,  10, 0)
        );
        when(mockService.getAllClientMetrics()).thenReturn(list);

        Map<String, Object> body = body(controller.getAllClientMetrics());

        assertEquals(Boolean.TRUE, body.get("success"));
        assertSame(list, body.get("data"));
        assertEquals(3, body.get("count"));
    }

    @Test
    void getAllClientMetrics_emptyList_countZero() {
        when(mockService.getAllClientMetrics()).thenReturn(Collections.emptyList());

        Map<String, Object> body = body(controller.getAllClientMetrics());

        assertEquals(Boolean.TRUE, body.get("success"));
        assertEquals(0, body.get("count"));
    }

    // =========================================================================
    // reset
    // =========================================================================

    @Test
    void resetClientMetric_success_successTrueWithTargetId() {
        when(mockService.resetClientMetric("C1")).thenReturn(true);

        Map<String, Object> body = body(controller.resetClientMetric("C1"));

        assertEquals(Boolean.TRUE, body.get("success"));
        assertTrue(body.get("message").toString().contains("C1"));
    }

    @Test
    void resetClientMetric_notFound_successFalseWithTargetId() {
        when(mockService.resetClientMetric("GHOST")).thenReturn(false);

        Map<String, Object> body = body(controller.resetClientMetric("GHOST"));

        assertEquals(Boolean.FALSE, body.get("success"));
        assertTrue(body.get("message").toString().contains("GHOST"));
    }

    @Test
    void resetAllClientMetrics_callsDelegateOnce() {
        doNothing().when(mockService).resetAllClientMetrics();

        controller.resetAllClientMetrics();

        verify(mockService, times(1)).resetAllClientMetrics();
    }
}