From aca84cc3878d1f9eb12f8ed2a75fa7105027b9a9 Mon Sep 17 00:00:00 2001
From: fing9 <djajsl54@naver.com>
Date: Wed, 6 Dec 2023 13:20:07 +0900
Subject: [PATCH] feat : problem recommendation

---
 ...RecommendationAlreadySolvedController.java | 25 ++++++++++++++++
 .../RecommendationAlreadySolvedService.java   | 30 +++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/main/java/com/randps/randomdefence/domain/recommendation/controller/RecommendationAlreadySolvedController.java
 create mode 100644 src/main/java/com/randps/randomdefence/domain/recommendation/service/RecommendationAlreadySolvedService.java

diff --git a/src/main/java/com/randps/randomdefence/domain/recommendation/controller/RecommendationAlreadySolvedController.java b/src/main/java/com/randps/randomdefence/domain/recommendation/controller/RecommendationAlreadySolvedController.java
new file mode 100644
index 0000000..d5b6bbe
--- /dev/null
+++ b/src/main/java/com/randps/randomdefence/domain/recommendation/controller/RecommendationAlreadySolvedController.java
@@ -0,0 +1,25 @@
+package com.randps.randomdefence.domain.recommendation.controller;
+
+import com.randps.randomdefence.domain.problem.dto.ProblemSolveJudgedDto;
+import com.randps.randomdefence.domain.recommendation.service.RecommendationAlreadySolvedService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.repository.query.Param;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("/api/v1/recommend/solved")
+public class RecommendationAlreadySolvedController {
+
+    private final RecommendationAlreadySolvedService recommendationAlreadySolvedService;
+
+    /*
+     * 유저가 기존에 푼 문제중 하나를 랜덤하게 뽑아온다.
+     */
+    @GetMapping("/")
+    public ProblemSolveJudgedDto getSolvedProblemRandom(@Param("bojHandle") String bojHandle) {
+        return recommendationAlreadySolvedService.findOneRandomSolvedProblem(bojHandle);
+    }
+}
diff --git a/src/main/java/com/randps/randomdefence/domain/recommendation/service/RecommendationAlreadySolvedService.java b/src/main/java/com/randps/randomdefence/domain/recommendation/service/RecommendationAlreadySolvedService.java
new file mode 100644
index 0000000..2a702d4
--- /dev/null
+++ b/src/main/java/com/randps/randomdefence/domain/recommendation/service/RecommendationAlreadySolvedService.java
@@ -0,0 +1,30 @@
+package com.randps.randomdefence.domain.recommendation.service;
+
+import com.randps.randomdefence.domain.problem.dto.ProblemDto;
+import com.randps.randomdefence.domain.problem.dto.ProblemSolveJudgedDto;
+import com.randps.randomdefence.domain.problem.service.ProblemService;
+import com.randps.randomdefence.domain.user.domain.UserAlreadySolved;
+import com.randps.randomdefence.domain.user.domain.UserAlreadySolvedRepository;
+import java.util.List;
+import java.util.NoSuchElementException;
+import javax.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@RequiredArgsConstructor
+@Service
+public class RecommendationAlreadySolvedService {
+
+    private final ProblemService problemService;
+
+    private final UserAlreadySolvedRepository userAlreadySolvedRepository;
+
+    @Transactional
+    public ProblemSolveJudgedDto findOneRandomSolvedProblem(String bojHandle) {
+        UserAlreadySolved userAlreadySolved = userAlreadySolvedRepository.findByBojHandle(bojHandle).orElseThrow(() -> new NoSuchElementException("유저가 기존에 푼 문제가 존재하지 않습니다."));
+        List<Integer> solvedProblems = userAlreadySolved.getAlreadySolvedList();
+        ProblemDto problemDto = problemService.findProblem(solvedProblems.get((int)Math.round(Math.random() * (solvedProblems.size() - 1))));
+        return new ProblemSolveJudgedDto(problemDto, true);
+    }
+
+}