<?php

namespace App\Services\Boards;

use App\Models\Boards\Board;
use App\Models\Boards\BoardComment;
use App\Models\Boards\Post;
use App\Models\Boards\PostCustomFieldValue;
use App\Services\Service;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Collection;

class PostService extends Service
{
    // =========================================================================
    // 게시글 조회 메서드
    // =========================================================================

    /**
     * 게시글 목록 조회 (페이징)
     */
    public function getPostsByBoard(int $boardId, array $filters = [], int $perPage = 15): LengthAwarePaginator
    {
        return Post::where('board_id', $boardId)
            ->where('tenant_id', $this->tenantId())
            ->when(isset($filters['search']), function ($q) use ($filters) {
                $q->where(function ($query) use ($filters) {
                    $query->where('title', 'like', "%{$filters['search']}%")
                        ->orWhere('content', 'like', "%{$filters['search']}%");
                });
            })
            ->when(isset($filters['is_notice']), fn ($q) => $q->where('is_notice', $filters['is_notice']))
            ->when(isset($filters['status']), fn ($q) => $q->where('status', $filters['status']))
            ->orderByDesc('is_notice')
            ->orderByDesc('created_at')
            ->paginate($perPage);
    }

    /**
     * 게시글 목록 조회 (게시판 코드 기반)
     */
    public function getPostsByBoardCode(string $boardCode, array $filters = [], int $perPage = 15): LengthAwarePaginator
    {
        $board = Board::accessible($this->tenantId())
            ->where('board_code', $boardCode)
            ->firstOrFail();

        return $this->getPostsByBoard($board->id, $filters, $perPage);
    }

    /**
     * 게시글 단건 조회
     */
    public function getPost(int $postId): ?Post
    {
        return Post::with(['files', 'comments.replies'])
            ->where('tenant_id', $this->tenantId())
            ->find($postId);
    }

    /**
     * 게시글 상세 조회 (조회수 증가)
     */
    public function getPostWithViewIncrement(int $postId): ?Post
    {
        $post = $this->getPost($postId);

        if ($post) {
            $post->increment('views');
        }

        return $post;
    }

    /**
     * 게시판 코드와 게시글 ID로 조회
     */
    public function getPostByCodeAndId(string $boardCode, int $postId): ?Post
    {
        $board = Board::accessible($this->tenantId())
            ->where('board_code', $boardCode)
            ->first();

        if (! $board) {
            return null;
        }

        return Post::with(['files', 'comments.replies', 'board'])
            ->where('board_id', $board->id)
            ->where('tenant_id', $this->tenantId())
            ->find($postId);
    }

    // =========================================================================
    // 게시글 생성 메서드
    // =========================================================================

    /**
     * 게시글 생성
     */
    public function createPost(int $boardId, array $data): Post
    {
        $data['board_id'] = $boardId;
        $data['tenant_id'] = $this->tenantId();
        $data['user_id'] = $this->apiUserId();
        $data['ip_address'] = request()->ip();
        $data['status'] = $data['status'] ?? 'published';
        $data['views'] = 0;

        $post = Post::create($data);

        // 커스텀 필드 저장
        if (isset($data['custom_fields'])) {
            $this->saveCustomFields($post->id, $data['custom_fields']);
        }

        return $post->fresh(['board', 'files']);
    }

    /**
     * 게시글 생성 (게시판 코드 기반)
     */
    public function createPostByBoardCode(string $boardCode, array $data): Post
    {
        $board = Board::accessible($this->tenantId())
            ->where('board_code', $boardCode)
            ->firstOrFail();

        return $this->createPost($board->id, $data);
    }

    // =========================================================================
    // 게시글 수정 메서드
    // =========================================================================

    /**
     * 게시글 수정
     */
    public function updatePost(int $postId, array $data): ?Post
    {
        $post = Post::where('tenant_id', $this->tenantId())
            ->find($postId);

        if (! $post) {
            return null;
        }

        $post->update($data);

        // 커스텀 필드 업데이트
        if (isset($data['custom_fields'])) {
            $this->saveCustomFields($post->id, $data['custom_fields']);
        }

        return $post->fresh(['board', 'files']);
    }

    /**
     * 게시글 수정 (게시판 코드 기반)
     */
    public function updatePostByBoardCode(string $boardCode, int $postId, array $data): ?Post
    {
        $board = Board::accessible($this->tenantId())
            ->where('board_code', $boardCode)
            ->first();

        if (! $board) {
            return null;
        }

        $post = Post::where('board_id', $board->id)
            ->where('tenant_id', $this->tenantId())
            ->find($postId);

        if (! $post) {
            return null;
        }

        $post->update($data);

        if (isset($data['custom_fields'])) {
            $this->saveCustomFields($post->id, $data['custom_fields']);
        }

        return $post->fresh(['board', 'files']);
    }

    // =========================================================================
    // 게시글 삭제 메서드
    // =========================================================================

    /**
     * 게시글 삭제 (Soft Delete)
     */
    public function deletePost(int $postId): bool
    {
        $post = Post::where('tenant_id', $this->tenantId())
            ->find($postId);

        if (! $post) {
            return false;
        }

        return $post->delete();
    }

    /**
     * 게시글 삭제 (게시판 코드 기반)
     */
    public function deletePostByBoardCode(string $boardCode, int $postId): bool
    {
        $board = Board::accessible($this->tenantId())
            ->where('board_code', $boardCode)
            ->first();

        if (! $board) {
            return false;
        }

        $post = Post::where('board_id', $board->id)
            ->where('tenant_id', $this->tenantId())
            ->find($postId);

        if (! $post) {
            return false;
        }

        return $post->delete();
    }

    // =========================================================================
    // 댓글 메서드
    // =========================================================================

    /**
     * 댓글 목록 조회
     */
    public function getComments(int $postId): Collection
    {
        return BoardComment::where('post_id', $postId)
            ->whereNull('parent_id')
            ->where('status', 'active')
            ->with('replies')
            ->orderBy('created_at')
            ->get();
    }

    /**
     * 댓글 작성
     */
    public function createComment(int $postId, array $data): BoardComment
    {
        $data['post_id'] = $postId;
        $data['user_id'] = $this->apiUserId();
        $data['ip_address'] = request()->ip();
        $data['status'] = 'active';

        return BoardComment::create($data);
    }

    /**
     * 댓글 수정
     */
    public function updateComment(int $commentId, array $data): ?BoardComment
    {
        $comment = BoardComment::where('user_id', $this->apiUserId())
            ->find($commentId);

        if (! $comment) {
            return null;
        }

        $comment->update($data);

        return $comment->fresh();
    }

    /**
     * 댓글 삭제
     */
    public function deleteComment(int $commentId): bool
    {
        $comment = BoardComment::where('user_id', $this->apiUserId())
            ->find($commentId);

        if (! $comment) {
            return false;
        }

        $comment->status = 'deleted';
        $comment->save();

        return true;
    }

    // =========================================================================
    // 커스텀 필드 메서드
    // =========================================================================

    /**
     * 커스텀 필드 값 저장
     */
    protected function saveCustomFields(int $postId, array $customFields): void
    {
        foreach ($customFields as $fieldId => $value) {
            PostCustomFieldValue::updateOrCreate(
                [
                    'post_id' => $postId,
                    'field_id' => $fieldId,
                ],
                [
                    'value' => is_array($value) ? json_encode($value) : $value,
                ]
            );
        }
    }

    /**
     * 커스텀 필드 값 조회
     */
    public function getCustomFieldValues(int $postId): Collection
    {
        return PostCustomFieldValue::where('post_id', $postId)
            ->with('field')
            ->get();
    }

    // =========================================================================
    // 나의 게시글 메서드
    // =========================================================================

    /**
     * 나의 게시글 목록 조회
     */
    public function getMyPosts(array $filters = [], int $perPage = 15): LengthAwarePaginator
    {
        return Post::where('user_id', $this->apiUserId())
            ->where('tenant_id', $this->tenantId())
            ->with(['board:id,board_code,name'])
            ->when(isset($filters['board_code']), function ($q) use ($filters) {
                $q->whereHas('board', fn ($query) => $query->where('board_code', $filters['board_code']));
            })
            ->when(isset($filters['search']), function ($q) use ($filters) {
                $q->where(function ($query) use ($filters) {
                    $query->where('title', 'like', "%{$filters['search']}%")
                        ->orWhere('content', 'like', "%{$filters['search']}%");
                });
            })
            ->when(isset($filters['status']), fn ($q) => $q->where('status', $filters['status']))
            ->orderByDesc('created_at')
            ->paginate($perPage);
    }
}