package logic

import (
	"context"
	"strings"

	"juwan-backend/app/community/rpc/internal/svc"
	"juwan-backend/app/community/rpc/pb"

	"github.com/zeromicro/go-zero/core/logx"
)

type SearchPostsLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewSearchPostsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *SearchPostsLogic {
	return &SearchPostsLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

func (l *SearchPostsLogic) SearchPosts(in *pb.SearchPostsReq) (*pb.SearchPostsResp, error) {
	limit := in.GetLimit()
	if limit <= 0 {
		limit = 20
	}
	offset := in.GetPage()
	if offset < 0 {
		offset = 0
	}

	store := l.svcCtx.Store
	store.Mu.RLock()
	defer store.Mu.RUnlock()

	filtered := make([]*pb.Posts, 0, len(store.Posts))
	for _, p := range store.Posts {
		if p.GetDeletedAt() > 0 {
			continue
		}
		if in.GetId() > 0 && p.GetId() != in.GetId() {
			continue
		}
		if in.AuthorId != nil && p.GetAuthorId() != in.GetAuthorId() {
			continue
		}
		if in.AuthorRole != nil && p.GetAuthorRole() != in.GetAuthorRole() {
			continue
		}
		if in.Title != nil && !strings.Contains(strings.ToLower(p.GetTitle()), strings.ToLower(in.GetTitle())) {
			continue
		}
		if in.Content != nil && !strings.Contains(strings.ToLower(p.GetContent()), strings.ToLower(in.GetContent())) {
			continue
		}
		if len(in.GetTags()) > 0 {
			match := false
			for _, t := range in.GetTags() {
				for _, pt := range p.GetTags() {
					if t == pt {
						match = true
						break
					}
				}
				if match {
					break
				}
			}
			if !match {
				continue
			}
		}

		cp := *p
		cp.Images = append([]string(nil), p.Images...)
		cp.Tags = append([]string(nil), p.Tags...)
		filtered = append(filtered, &cp)
	}

	sortPostsDesc(filtered)

	if offset >= int64(len(filtered)) {
		return &pb.SearchPostsResp{Posts: []*pb.Posts{}}, nil
	}
	end := offset + limit
	if end > int64(len(filtered)) {
		end = int64(len(filtered))
	}

	return &pb.SearchPostsResp{Posts: filtered[offset:end]}, nil
}