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package resolver
import (
"context"
"fmt"
"strconv"
"undef.ninja/x/feedaka/db"
"undef.ninja/x/feedaka/graphql/model"
)
const defaultPageSize = 30
const maxPageSize = 100
// articleRow is a common interface for all paginated article query rows.
type articleRow struct {
ID int64
FeedID int64
Guid string
Title string
Url string
IsRead int64
FeedID2 int64
FeedUrl string
FeedTitle string
FeedIsSubscribed int64
}
func toArticleRow(r any) articleRow {
switch v := r.(type) {
case db.GetArticlesPaginatedRow:
return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
case db.GetArticlesPaginatedAfterRow:
return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
case db.GetArticlesByFeedPaginatedRow:
return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
case db.GetArticlesByFeedPaginatedAfterRow:
return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
default:
panic("unexpected row type")
}
}
func rowToArticle(row articleRow) *model.Article {
return &model.Article{
ID: strconv.FormatInt(row.ID, 10),
FeedID: strconv.FormatInt(row.FeedID, 10),
GUID: row.Guid,
Title: row.Title,
URL: row.Url,
IsRead: row.IsRead == 1,
Feed: &model.Feed{
ID: strconv.FormatInt(row.FeedID2, 10),
URL: row.FeedUrl,
Title: row.FeedTitle,
IsSubscribed: row.FeedIsSubscribed == 1,
},
}
}
func (r *queryResolver) paginatedArticles(ctx context.Context, isRead int64, feedID *string, after *string, first *int32) (*model.ArticleConnection, error) {
userID, err := getUserIDFromContext(ctx)
if err != nil {
return nil, err
}
limit := int64(defaultPageSize)
if first != nil {
limit = int64(*first)
if limit <= 0 {
limit = int64(defaultPageSize)
}
if limit > maxPageSize {
limit = maxPageSize
}
}
// Fetch limit+1 to determine hasNextPage
fetchLimit := limit + 1
var rawRows []any
if feedID != nil {
parsedFeedID, err := strconv.ParseInt(*feedID, 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid feed ID: %w", err)
}
if after != nil {
cursor, err := strconv.ParseInt(*after, 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid cursor: %w", err)
}
rows, err := r.Queries.GetArticlesByFeedPaginatedAfter(ctx, db.GetArticlesByFeedPaginatedAfterParams{
IsRead: isRead,
UserID: userID,
FeedID: parsedFeedID,
ID: cursor,
Limit: fetchLimit,
})
if err != nil {
return nil, fmt.Errorf("failed to query articles: %w", err)
}
for _, row := range rows {
rawRows = append(rawRows, row)
}
} else {
rows, err := r.Queries.GetArticlesByFeedPaginated(ctx, db.GetArticlesByFeedPaginatedParams{
IsRead: isRead,
UserID: userID,
FeedID: parsedFeedID,
Limit: fetchLimit,
})
if err != nil {
return nil, fmt.Errorf("failed to query articles: %w", err)
}
for _, row := range rows {
rawRows = append(rawRows, row)
}
}
} else {
if after != nil {
cursor, err := strconv.ParseInt(*after, 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid cursor: %w", err)
}
rows, err := r.Queries.GetArticlesPaginatedAfter(ctx, db.GetArticlesPaginatedAfterParams{
IsRead: isRead,
UserID: userID,
ID: cursor,
Limit: fetchLimit,
})
if err != nil {
return nil, fmt.Errorf("failed to query articles: %w", err)
}
for _, row := range rows {
rawRows = append(rawRows, row)
}
} else {
rows, err := r.Queries.GetArticlesPaginated(ctx, db.GetArticlesPaginatedParams{
IsRead: isRead,
UserID: userID,
Limit: fetchLimit,
})
if err != nil {
return nil, fmt.Errorf("failed to query articles: %w", err)
}
for _, row := range rows {
rawRows = append(rawRows, row)
}
}
}
hasNextPage := int64(len(rawRows)) > limit
if hasNextPage {
rawRows = rawRows[:limit]
}
articles := make([]*model.Article, 0, len(rawRows))
for _, raw := range rawRows {
articles = append(articles, rowToArticle(toArticleRow(raw)))
}
var endCursor *string
if len(articles) > 0 {
lastID := articles[len(articles)-1].ID
endCursor = &lastID
}
return &model.ArticleConnection{
Articles: articles,
PageInfo: &model.PageInfo{
HasNextPage: hasNextPage,
EndCursor: endCursor,
},
}, nil
}
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