[#98] 대한민국 평균 행복지수 API 🎃

src/main/java/com/hobak/happinessql/domain/report/api/TrendController.java

@@ -0,0 +1,25 @@
+package com.hobak.happinessql.domain.report.api;
+
+import com.hobak.happinessql.domain.report.application.TrendHappinessService;
+import com.hobak.happinessql.domain.report.dto.TrendHappinessResponseDto;
+import com.hobak.happinessql.global.response.DataResponseDto;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name="Trend", description = "행복 트렌드 관련 REST API에 대한 명세를 제공합니다.")
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("api/trend")
+public class TrendController {
+    private final TrendHappinessService trendHappinessService;
+    @Operation(summary = "대한민국 평균 행복지수", description = "전체 유저의 평균 행복지수와 그에 따른 수준을 판단합니다.")
+    @GetMapping("/happiness")
+    public DataResponseDto<TrendHappinessResponseDto> getHappiness() {
+        TrendHappinessResponseDto responseDto = trendHappinessService.getTrendHappiness();
+        return DataResponseDto.of(responseDto, "대한민국 평균 행복지수를 성공적으로 조회했습니다.");
+    }
+}

src/main/java/com/hobak/happinessql/domain/report/application/TrendHappinessService.java

@@ -0,0 +1,34 @@
+package com.hobak.happinessql.domain.report.application;
+
+import com.hobak.happinessql.domain.record.domain.Record;
+import com.hobak.happinessql.domain.record.repository.RecordRepository;
+import com.hobak.happinessql.domain.report.converter.TrendConverter;
+import com.hobak.happinessql.domain.report.domain.HappinessLevel;
+import com.hobak.happinessql.domain.report.dto.TrendHappinessResponseDto;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class TrendHappinessService {
+    private final RecordRepository recordRepository;
+    public TrendHappinessResponseDto getTrendHappiness() {
+        double totalHappiness = recordRepository.findAll().stream().mapToInt(Record::getHappiness).sum();
+        double averageHappiness = totalHappiness / recordRepository.count();
+        averageHappiness = Math.round(averageHappiness * 100.0) / 100.0;
+        HappinessLevel level = HappinessLevel.of(averageHappiness);
+        String emoji;
+        if (averageHappiness >= 1 && averageHappiness < 2) {
+            emoji = "😱";
+        } else if (averageHappiness >= 2 && averageHappiness < 3) {
+            emoji = "🙁";
+        } else if (averageHappiness >= 3 && averageHappiness < 5) {
+            emoji = "😐";
+        } else if (averageHappiness >= 5 && averageHappiness < 6) {
+            emoji = "🙂";
+        } else {
+            emoji = "😄";
+        }
+        return TrendConverter.toTrendHappinessResponseDto(averageHappiness, level, emoji);
+    }
+}

src/main/java/com/hobak/happinessql/domain/report/converter/TrendConverter.java

@@ -0,0 +1,15 @@
+package com.hobak.happinessql.domain.report.converter;
+
+import com.hobak.happinessql.domain.report.domain.HappinessLevel;
+import com.hobak.happinessql.domain.report.dto.TrendHappinessResponseDto;
+
+public class TrendConverter {
+    public static TrendHappinessResponseDto toTrendHappinessResponseDto(double happiness, HappinessLevel level, String emoji) {
+        return TrendHappinessResponseDto
+                .builder()
+                .happiness(happiness)
+                .level(level)
+                .emoji(emoji)
+                .build();
+    }
+}

src/main/java/com/hobak/happinessql/domain/report/domain/HappinessLevel.java

@@ -0,0 +1,32 @@
+package com.hobak.happinessql.domain.report.domain;
+
+import com.fasterxml.jackson.annotation.JsonValue;
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public enum HappinessLevel {
+    VERY_LOW("매우 낮음"),
+    LOW("낮음"),
+    MEDIUM("보통"),
+    HIGH("높음"),
+    VERY_HIGH("매우 높음");
+    private final String viewName;
+    public static HappinessLevel of(double happiness) {
+        if (happiness >= 1 && happiness < 2) {
+            return VERY_LOW;
+        } else if (happiness >= 2 && happiness < 3) {
+            return LOW;
+        } else if (happiness >= 3 && happiness < 5) {
+            return MEDIUM;
+        } else if (happiness >= 5 && happiness < 6) {
+            return HIGH;
+        } else {
+            return VERY_HIGH;
+        }
+    }
+    @JsonValue
+    public String getViewName() {
+        return viewName;
+    }
+
+}

src/main/java/com/hobak/happinessql/domain/report/dto/TrendHappinessResponseDto.java

@@ -0,0 +1,21 @@
+package com.hobak.happinessql.domain.report.dto;
+
+import com.hobak.happinessql.domain.report.domain.HappinessLevel;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class TrendHappinessResponseDto {
+    private double happiness;
+    private HappinessLevel level;
+    private String emoji;
+    @Builder
+    public TrendHappinessResponseDto(double happiness, HappinessLevel level, String emoji){
+        this.happiness = happiness;
+        this.level = level;
+        this.emoji = emoji;
+    }
+}