package timelineservicelogic

import (
	"app-cloudep-tweeting-service/internal/domain"
	"app-cloudep-tweeting-service/internal/domain/repository"
	"context"

	ers "code.30cm.net/digimon/library-go/errs"

	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
	"app-cloudep-tweeting-service/internal/svc"

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

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

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

type fetchTimelineReq struct {
	UID       string `json:"uid" validate:"required"`
	PageSize  int64  `json:"page_size" validate:"required"`
	PageIndex int64  `json:"page_index" validate:"required"`
}

// FetchTimeline 取得這個人的動態時報
func (l *FetchTimelineLogic) FetchTimeline(in *tweeting.GetTimelineReq) (*tweeting.FetchTimelineResponse, error) {
	// 驗證資料
	if err := l.svcCtx.Validate.ValidateAll(&fetchTimelineReq{
		UID:       in.GetUid(),
		PageSize:  in.PageSize,
		PageIndex: in.PageIndex,
	}); err != nil {
		// 錯誤代碼 05-011-00
		return nil, ers.InvalidFormat(err.Error())
	}

	resp, err := l.svcCtx.TimelineRepo.FetchTimeline(l.ctx, repository.FetchTimelineRequest{
		UID:       in.GetUid(),
		PageIndex: in.GetPageIndex(),
		PageSize:  in.GetPageSize(),
	})
	if err != nil {
		// 錯誤代碼 05-021-21
		e := domain.CommentErrorL(
			domain.FetchTimeLineErrorCode,
			logx.WithContext(l.ctx),
			[]logx.LogField{
				{Key: "req", Value: in},
				{Key: "func", Value: "TimelineRepo.FetchTimeline"},
				{Key: "err", Value: err},
			},
			"failed to fetch timeline repo :", in.GetUid()).Wrap(err)

		return nil, e
	}

	result := make([]*tweeting.FetchTimelineItem, 0, resp.Page.Size)
	for _, item := range resp.Items {
		result = append(result, &tweeting.FetchTimelineItem{
			PostId: item.PostID,
			Score:  item.Score,
		})
	}

	return &tweeting.FetchTimelineResponse{
		Posts: result,
		Page: &tweeting.Pager{
			Total: resp.Page.Total,
			Index: resp.Page.Index,
			Size:  resp.Page.Size,
		},
	}, nil
}