package service

import (
	"context"
	"io"
	"kra/internal/biz"
)

type MediaService struct{ uc *biz.MediaUsecase }

func NewMediaService(uc *biz.MediaUsecase) *MediaService { return &MediaService{uc: uc} }
func mediaDTO(v *biz.MediaFile) map[string]any {
	return map[string]any{"ID": v.ID, "CreatedAt": v.CreatedAt, "UpdatedAt": v.UpdatedAt, "DeletedAt": nil, "name": v.Name, "classId": v.CategoryID, "url": v.URL, "tag": v.Tag, "key": v.Key, "size": v.Size, "mime": v.Mime, "md5": v.MD5, "userId": v.UserID}
}
func categoryDTO(v *biz.AttachmentCategory) map[string]any {
	children := make([]map[string]any, 0, len(v.Children))
	for _, x := range v.Children {
		children = append(children, categoryDTO(x))
	}
	return map[string]any{"ID": v.ID, "CreatedAt": v.CreatedAt, "UpdatedAt": v.UpdatedAt, "DeletedAt": nil, "name": v.Name, "pid": v.ParentID, "children": children}
}
func (s *MediaService) Upload(ctx context.Context, userID uint, name, mime string, categoryID int, reader io.Reader, save bool) (map[string]any, error) {
	v, err := s.uc.Upload(ctx, userID, name, mime, categoryID, reader, save)
	if err != nil {
		return nil, err
	}
	return mediaDTO(v), nil
}
func (s *MediaService) Media(ctx context.Context, id uint) (map[string]any, error) {
	v, err := s.uc.Repo().FindMedia(ctx, id)
	if err != nil {
		return nil, err
	}
	return mediaDTO(v), nil
}
func (s *MediaService) MediaList(ctx context.Context, page, size int, keyword string, categoryID int, tag string, userID uint) ([]map[string]any, int64, error) {
	items, total, err := s.uc.Repo().ListMedia(ctx, page, size, keyword, categoryID, tag, userID)
	if err != nil {
		return nil, 0, err
	}
	out := make([]map[string]any, 0, len(items))
	for _, v := range items {
		out = append(out, mediaDTO(v))
	}
	return out, total, nil
}
func (s *MediaService) Delete(ctx context.Context, id uint) error { return s.uc.Delete(ctx, id) }
func (s *MediaService) Rename(ctx context.Context, id uint, name string) error {
	return s.uc.Repo().UpdateMediaName(ctx, id, name)
}
func (s *MediaService) ImportURLs(ctx context.Context, items []*biz.MediaFile) error {
	return s.uc.Repo().CreateMediaBatch(ctx, items)
}
func (s *MediaService) Storage(ctx context.Context, prefix, cursor string, limit int) ([]map[string]any, string, bool, error) {
	items, next, more, err := s.uc.ListStorage(ctx, prefix, cursor, limit)
	if err != nil {
		return nil, "", false, err
	}
	out := make([]map[string]any, 0, len(items))
	for _, v := range items {
		out = append(out, map[string]any{"name": v.Name, "key": v.Path, "url": v.URL, "size": v.Size})
	}
	return out, next, more, nil
}
func (s *MediaService) Categories(ctx context.Context) ([]map[string]any, error) {
	items, err := s.uc.Repo().ListCategories(ctx)
	if err != nil {
		return nil, err
	}
	out := make([]map[string]any, 0, len(items))
	for _, v := range items {
		out = append(out, categoryDTO(v))
	}
	return out, nil
}
func (s *MediaService) SaveCategory(ctx context.Context, v *biz.AttachmentCategory) error {
	return s.uc.Repo().SaveCategory(ctx, v)
}
func (s *MediaService) DeleteCategory(ctx context.Context, id uint) error {
	return s.uc.Repo().DeleteCategory(ctx, id)
}
func (s *MediaService) InitUpload(ctx context.Context, userID uint, name, hash string, size, chunkSize int64, total int) (map[string]any, error) {
	session, media, chunks, err := s.uc.InitUpload(ctx, userID, name, hash, size, chunkSize, total)
	if err != nil {
		return nil, err
	}
	if media != nil {
		return map[string]any{"instant": true, "media": mediaDTO(media), "uploadedChunks": []int{}}, nil
	}
	return map[string]any{"instant": false, "uploadId": session.ID, "uploadedChunks": chunks, "media": nil}, nil
}
func (s *MediaService) SaveChunk(ctx context.Context, userID, uploadID uint, index int, hash string, reader io.Reader) error {
	return s.uc.SaveChunk(ctx, userID, uploadID, index, hash, reader)
}
func (s *MediaService) CompleteUpload(ctx context.Context, userID, uploadID uint) (map[string]any, error) {
	v, err := s.uc.CompleteUpload(ctx, userID, uploadID, "")
	if err != nil {
		return nil, err
	}
	return mediaDTO(v), nil
}
func (s *MediaService) CancelUpload(ctx context.Context, userID, uploadID uint) error {
	return s.uc.CancelUpload(ctx, userID, uploadID)
}