package service

import (
	"context"
	"encoding/json"
	"time"

	"kra/internal/biz"
)

type AnnouncementInput struct {
	ID          uint
	Title       string
	Content     string
	UserID      *uint
	Attachments json.RawMessage
}

type AnnouncementService struct{ uc *biz.AnnouncementUsecase }

func NewAnnouncementService(uc *biz.AnnouncementUsecase) *AnnouncementService {
	return &AnnouncementService{uc: uc}
}

func announcementDTO(item *biz.Announcement) map[string]any {
	attachments := any([]any{})
	if len(item.Attachments) > 0 {
		_ = json.Unmarshal(item.Attachments, &attachments)
	}
	return map[string]any{
		"ID": item.ID, "CreatedAt": item.CreatedAt, "UpdatedAt": item.UpdatedAt, "DeletedAt": nil,
		"title": item.Title, "content": item.Content, "userID": item.UserID, "attachments": attachments,
	}
}

func announcementDO(in AnnouncementInput) *biz.Announcement {
	return &biz.Announcement{ID: in.ID, Title: in.Title, Content: in.Content, UserID: in.UserID, Attachments: in.Attachments}
}

func (s *AnnouncementService) Create(ctx context.Context, in AnnouncementInput) error {
	return s.uc.Create(ctx, announcementDO(in))
}

func (s *AnnouncementService) Update(ctx context.Context, in AnnouncementInput) error {
	return s.uc.Update(ctx, announcementDO(in))
}

func (s *AnnouncementService) Delete(ctx context.Context, id uint) error {
	return s.uc.Delete(ctx, id)
}

func (s *AnnouncementService) DeleteByIDs(ctx context.Context, ids []uint) error {
	return s.uc.DeleteByIDs(ctx, ids)
}

func (s *AnnouncementService) Find(ctx context.Context, id uint) (map[string]any, error) {
	item, err := s.uc.Find(ctx, id)
	if err != nil {
		return nil, err
	}
	return announcementDTO(item), nil
}

func (s *AnnouncementService) List(ctx context.Context, page, pageSize int, start, end *time.Time) ([]map[string]any, int64, error) {
	items, total, err := s.uc.List(ctx, biz.AnnouncementFilter{Page: page, PageSize: pageSize, StartCreatedAt: start, EndCreatedAt: end})
	if err != nil {
		return nil, 0, err
	}
	result := make([]map[string]any, 0, len(items))
	for _, item := range items {
		result = append(result, announcementDTO(item))
	}
	return result, total, nil
}

func (s *AnnouncementService) UserOptions(ctx context.Context) ([]map[string]any, error) {
	items, err := s.uc.UserOptions(ctx)
	if err != nil {
		return nil, err
	}
	result := make([]map[string]any, 0, len(items))
	for _, item := range items {
		result = append(result, map[string]any{"label": item.Label, "value": item.Value})
	}
	return result, nil
}