package sgis.board.controller;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.time.OffsetDateTime; // OffsetDateTime import 추가
import java.time.format.DateTimeFormatter;
import java.util.Map;
import java.util.stream.Collectors;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute; // ModelAttribute import는 다른 메서드를 위해 유지
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

import egovframework.com.cmm.util.EgovUserDetailsHelper;
import sgis.board.entity.Board;
import sgis.board.entity.Member;
import sgis.board.entity.Post; // Post entity import
import sgis.board.mapper.BoardMapper;
import sgis.board.mapper.MemberMapper;
import sgis.board.mapper.PostMapper;
import sgis.board.service.PostService;
import sgis.com.vo.SessionVO;
import sgis.com.web.BaseController;

@RestController // @ResponseBody(JSON)응답
public class BoardRestController extends BaseController {

	@Autowired
	BoardMapper boardMapper; // 기존 Board 관련 로직을 사용하지 않는다면 제거 고려

	@Autowired
	PostService postService;

	@Autowired
	MemberMapper memberMapper;

	// ObjectMapper 인스턴스 생성
    private final ObjectMapper objectMapper = new ObjectMapper();

    public BoardRestController() {
        // OffsetDateTime을 ISO 8601 형식으로 직렬화하기 위한 설정
        objectMapper.findAndRegisterModules(); // Java 8 date/time modules 등록
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    }

	/**
	  * @Method_Name : getSessionInfo
	  * @Date : 2022. 5. 10.
	  * @Creator : ICTWAY KIM Yoon-Su
	  * @Method_Discription : 세션정보 가져오기
	  * @return
	  * @throws Exception
	  */
	public SessionVO getSessionInfo() throws Exception {
		return (SessionVO) EgovUserDetailsHelper.getAuthenticatedUser();
	}

	// Post 객체를 Board 객체로 변환하는 헬퍼 메서드
	private Board postToBoard(Post post) {
		Board board = new Board();
		if( post == null ) {
			return board;
		}
		board.setIdx(post.getPostId() != null ? post.getPostId().intValue() : 0);
		board.setUserId(post.getUserNo() != null ? String.valueOf(post.getUserNo()) : null);
		// 답변글 제목 형식 변경 로직
		if (post.getParentPostId() != null && post.getParentPostId() != 0) {
			// 부모 게시글 정보 조회 (부모 게시글의 제목을 가져오기 위함)
			Post parentPost = postService.getPostById(post.getParentPostId());
			if (parentPost != null) {
				board.setTitle("" + parentPost.getTitle()); // "<상위글 제목>" 형식으로 설정
			} else {
				board.setTitle(post.getTitle()); // 부모 게시글을 찾을 수 없으면 원본 제목 사용
			}
		} else {
			board.setTitle(post.getTitle()); // 답변글이 아니면 원본 제목 사용
		}

		board.setBoardContent(post.getContent());
		board.setWriter(post.getUserNo() != null ? "User " + post.getUserNo() : "Unknown"); // 실제 사용자 이름을 가져오는 로직 필요

		// Handle dates: OffsetDateTime to String (assuming 'yyyy-MM-dd HH:mm:ss' format for indate)
		if (post.getCreatedAt() != null) { // Checks if createdAt is not null
			board.setIndate(post.getCreatedAt().toLocalDateTime().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))); // Formats createdAt to String
		} else {
			board.setIndate(null); // Sets indate to null if createdAt is null
		}
		board.setCount(post.getViewCount() != null ? post.getViewCount() : 0); // Maps viewCount to count, handling potential null

		// JSP의 Kendo Grid가 기대하는 project 관련 필드들 (Post 데이터에서 매핑 필요)
		board.setProjectName(post.getTitle()); // 예시: Post의 title을 projectName으로 매핑
		board.setProjectHarborName(""); // Post에 직접적인 매핑이 없다면 빈 문자열 또는 다른 로직으로 채움
		board.setProjectOrderingName("");
		board.setProjectAffiliatedName("");
		board.setProjectInputId(post.getUserNo() != null ? String.valueOf(post.getUserNo()) : null); // 예시: Post의 userId를 projectInputId로 매핑

		// projectStartDate, projectEndDate도 Post의 createdAt, updatedAt에서 매핑
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
		if (post.getCreatedAt() != null) {
			board.setProjectStartDate(post.getCreatedAt().format(formatter));
		} else {
			board.setProjectStartDate(null);
		}
		if (post.getUpdatedAt() != null) {
			board.setProjectEndDate(post.getUpdatedAt().format(formatter));
		} else {
			board.setProjectEndDate(null);
		}
		board.setUserNm(post.getUserNo() != null ? "User" + post.getUserNo() : "Unknown"); // userNm 매핑 (예시)
		board.setParentPostId(post.getParentPostId()); // parentPostId 매핑 추가

		return board;
	}


	// @ResponseBody->jackson-databind(객체를->JSON 데이터포멧으로 변환)
	@RequestMapping(value = "/sgis/portal/board/all.do", produces = "application/json;charset=UTF-8")
	public String boardList(@RequestParam HashMap<String,Object> params, ModelMap model, Member m, HttpSession session) throws JsonProcessingException {
		String boardCategoryIdParam = (String) params.get("boardCategoryId"); // Get the parameter as String
		List<Post> posts;

		// 게시글 조회
		if ("all".equalsIgnoreCase(boardCategoryIdParam) || boardCategoryIdParam == null || boardCategoryIdParam.isEmpty()) {
			posts = postService.getAllPosts(); // If "all" or null/empty, get all posts
		} else {
			try {
				Integer boardCategoryId = Integer.valueOf(boardCategoryIdParam); // Try to convert to Integer
				posts = postService.getPostsByBoardCategoryId(boardCategoryId); // Get posts by specific category
			} catch (NumberFormatException e) {
				System.err.println("Invalid boardCategoryId format: " + boardCategoryIdParam + ". Fetching all posts instead.");
				posts = postService.getAllPosts(); // Fallback to all posts if conversion fails
			}
		}

		// 게시글 정렬 로직 (부모-자식 관계에 따라 정렬)
		List<Board> boardListForJsp = new ArrayList<>();

		// 1. 부모 게시글과 답변 게시글을 분리
		Map<Long, List<Post>> repliesMap = posts.stream()
			.filter(post -> post.getParentPostId() != null)
			.collect(Collectors.groupingBy(Post::getParentPostId, Collectors.toCollection(ArrayList::new)));

		List<Post> topLevelPosts = posts.stream()
			.filter(post -> post.getParentPostId() == null)
			.sorted(Comparator.comparing(Post::getCreatedAt).reversed()) // 최신글이 위로 오도록 정렬
			.collect(Collectors.toList());

		// 2. 부모 게시글 아래에 답변 게시글을 삽입하여 최종 정렬된 리스트 생성
		for (Post topPost : topLevelPosts) {
			boardListForJsp.add(postToBoard(topPost)); // 부모 게시글 추가

			// 해당 부모 게시글의 답변들을 가져와서 정렬 (예: 오래된 답변이 먼저 오도록)
			List<Post> currentReplies = repliesMap.get(topPost.getPostId());
			if (currentReplies != null && !currentReplies.isEmpty()) {
				currentReplies.sort(Comparator.comparing(Post::getCreatedAt)); // 답변은 오래된 순서로
				for (Post reply : currentReplies) {
					boardListForJsp.add(postToBoard(reply)); // 답변 게시글 추가
				}
			}
		}

		HashMap<String, Object> responseMap = new HashMap<>();
		responseMap.put("dataList1", boardListForJsp);

		return objectMapper.writeValueAsString(responseMap); // Returns the list of Board objects as JSON data
	}

	@PostMapping("/sgis/portal/board/new.do")
	@ResponseBody
	public Post createNewPost(
	    @RequestParam("boardCategoryId") Integer boardCategoryId,
	    @RequestParam("title") String title,
	    @RequestParam("boardContent") String content,
	    // Using @RequestParam(value = "parentPostId", required = false) for optionality.
	    // If it comes as an empty string, it will be null.
	    @RequestParam(value = "parentPostId", required = false) Long parentPostId // This is good
	) {
	    Post newPost = new Post();
	    newPost.setBoardCategoryId(boardCategoryId);
	    newPost.setTitle(title);
	    newPost.setContent(content);
	    // parentPostId를 Post 객체에 설정합니다. (null일 수도 있음)
	    newPost.setParentPostId(parentPostId);


	    // userId를 세션에서 직접 가져와 Post 객체에 설정합니다.
	    try {
	        SessionVO sessionVO = getSessionInfo();

	        String userId = sessionVO.getsUserId();

	        if (sessionVO != null && sessionVO.getsUserId() != null) {
	        	Member m = memberMapper.registerCheck(userId);
	    		if( m!=null ) {
	    			newPost.setUserNo(m.getUserNo()); // userId는 String 타입으로 직접 설정
	    		}

	        } else {
	            System.err.println("User ID not found in session for Post creation or session is null.");
	            throw new IllegalStateException("User ID is required for post creation.");
	        }
	    } catch (Exception e) {
	        System.err.println("Error getting session info for Post creation: " + e.getMessage());
	        throw new RuntimeException("Failed to get session user info.", e);
	    }


	    // 그 외 필드 (기본값 설정)
	    newPost.setViewCount(0); // 새 글이므로 0
	    newPost.setStatus("active"); // 기본 상태
	    newPost.setCreatedAt(OffsetDateTime.now()); // 현재 시간으로 설정
	    newPost.setUpdatedAt(OffsetDateTime.now()); // 현재 시간으로 설정

	    // PostService를 통해 게시글 생성
	    Post createdPost = postService.createPost(newPost);

	    // 생성된 Post 객체 반환 (클라이언트에게 성공 여부 및 생성된 게시글 정보 전달)
	    return createdPost;
	}


	@DeleteMapping("/sgis/portal/board/delete{idx}.do")
	public void boardDelete(@PathVariable("idx") int idx) {
		postService.deletePost(Long.valueOf(idx)); // PostService의 deletePost 호출
	}

	@PutMapping("/sgis/portal/board/update.do")
	public void boardUpdate(@RequestBody Board vo) {
	    // 1. Get the postId from the incoming Board object
	    Long postId = Long.valueOf(vo.getIdx());

	    // 2. Fetch the existing Post from the database
	    Post existingPost = postService.getPostById(postId);

	    if (existingPost == null) {
	        // Handle case where the post to update is not found.
	        // You might want to throw a specific exception or return an error response.
	        System.err.println("Post with ID " + postId + " not found for update.");
	        // Example: throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Post not found");
	        return; // Or return an appropriate ResponseEntity
	    }

	    // 3. Update only the fields that are provided in the request body
	    // The JSP sends title and boardContent, which map to title and content in Post.
	    existingPost.setTitle(vo.getTitle());
	    existingPost.setContent(vo.getBoardContent());
	    existingPost.setUpdatedAt(OffsetDateTime.now()); // Update the modification timestamp

	    // Other fields like boardCategoryId, parentPostId, userNo, viewCount, status
	    // will retain their original values from 'existingPost' as they are not
	    // explicitly updated from the 'Board vo' in this method.

	    // 4. Call PostService to update the post with the modified existingPost object
	    postService.updatePost(existingPost);
	}

	@GetMapping("/sgis/portal/board/{idx}.do")
	public Board boardContent(@RequestParam HashMap<String,Object> params, @PathVariable("idx") int idx) {
		Post post = postService.getPostById(Long.valueOf(idx) ); // PostService를 통해 Post 조회
		Board vo = postToBoard(post); // Post 객체를 Board 객체로 변환
		return vo;
	}

	@PutMapping("/sgis/portal/board/count/{idx}.do")
	public Board boardCount(@PathVariable("idx") int idx) {
		Post post = postService.getPostById(Long.valueOf(idx)); // getPostById 호출 시 조회수 자동 증가
		Board vo = postToBoard(post);
		return vo;
	}
}