// Code generated by sqlc. DO NOT EDIT.
// versions:
//   sqlc v1.31.1
// source: library_changes.sql

package dbq

import (
	"context"

	"github.com/jackc/pgx/v5/pgtype"
)

const deleteOldLibraryDeletes = `-- name: DeleteOldLibraryDeletes :one
WITH gone AS (
    DELETE FROM library_changes WHERE op = 'delete' AND changed_at < $1 RETURNING id
), mark AS (
    UPDATE library_changes_trimmed
       SET through = GREATEST(through, (SELECT COALESCE(max(id), 0) FROM gone))
)
SELECT count(*)::BIGINT FROM gone
`

// Removes deletes older than the cutoff and raises the trimmed mark past the
// highest one, so an app whose cursor is below it starts over. Returns how
// many went.
func (q *Queries) DeleteOldLibraryDeletes(ctx context.Context, changedAt pgtype.Timestamptz) (int64, error) {
	row := q.db.QueryRow(ctx, deleteOldLibraryDeletes, changedAt)
	var column_1 int64
	err := row.Scan(&column_1)
	return column_1, err
}

const deleteSupersededLibraryChanges = `-- name: DeleteSupersededLibraryChanges :execrows
DELETE FROM library_changes old
 WHERE EXISTS (SELECT 1 FROM library_changes newer
                WHERE newer.entity_type = old.entity_type
                  AND newer.entity_id = old.entity_id
                  AND newer.id > old.id)
`

// Removes every row a newer row for the same entity has superseded. An app
// reading from any cursor still meets the newer row, so it loses nothing.
func (q *Queries) DeleteSupersededLibraryChanges(ctx context.Context) (int64, error) {
	result, err := q.db.Exec(ctx, deleteSupersededLibraryChanges)
	if err != nil {
		return 0, err
	}
	return result.RowsAffected(), nil
}

const getLastIssuedLibraryChangeCursor = `-- name: GetLastIssuedLibraryChangeCursor :one
SELECT COALESCE(pg_sequence_last_value(pg_get_serial_sequence('library_changes', 'id')::regclass), 0)::BIGINT
`

// The highest cursor this server has handed out, even once the compactor has
// trimmed the rows: the id sequence's last value. A restored server's
// sequence stands at the backup's last change.
func (q *Queries) GetLastIssuedLibraryChangeCursor(ctx context.Context) (int64, error) {
	row := q.db.QueryRow(ctx, getLastIssuedLibraryChangeCursor)
	var column_1 int64
	err := row.Scan(&column_1)
	return column_1, err
}

const getLibraryChangesSince = `-- name: GetLibraryChangesSince :many
SELECT id, entity_type, entity_id, op, changed_at
FROM library_changes
WHERE id > $1
ORDER BY id ASC
LIMIT $2
`

type GetLibraryChangesSinceParams struct {
	ID    int64
	Limit int32
}

func (q *Queries) GetLibraryChangesSince(ctx context.Context, arg GetLibraryChangesSinceParams) ([]LibraryChange, error) {
	rows, err := q.db.Query(ctx, getLibraryChangesSince, arg.ID, arg.Limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var items []LibraryChange
	for rows.Next() {
		var i LibraryChange
		if err := rows.Scan(
			&i.ID,
			&i.EntityType,
			&i.EntityID,
			&i.Op,
			&i.ChangedAt,
		); err != nil {
			return nil, err
		}
		items = append(items, i)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return items, nil
}

const getLibraryChangesTrimmedThrough = `-- name: GetLibraryChangesTrimmedThrough :one
SELECT through FROM library_changes_trimmed
`

// The highest id of a delete the compactor has dropped. A cursor below it may
// have missed that delete.
func (q *Queries) GetLibraryChangesTrimmedThrough(ctx context.Context) (int64, error) {
	row := q.db.QueryRow(ctx, getLibraryChangesTrimmedThrough)
	var through int64
	err := row.Scan(&through)
	return through, err
}

const getMaxLibraryChangeCursor = `-- name: GetMaxLibraryChangeCursor :one
SELECT COALESCE(MAX(id), 0)::BIGINT FROM library_changes
`

func (q *Queries) GetMaxLibraryChangeCursor(ctx context.Context) (int64, error) {
	row := q.db.QueryRow(ctx, getMaxLibraryChangeCursor)
	var column_1 int64
	err := row.Scan(&column_1)
	return column_1, err
}

const insertLibraryChange = `-- name: InsertLibraryChange :exec
INSERT INTO library_changes (entity_type, entity_id, op)
VALUES ($1, $2, $3)
`

type InsertLibraryChangeParams struct {
	EntityType string
	EntityID   string
	Op         string
}

func (q *Queries) InsertLibraryChange(ctx context.Context, arg InsertLibraryChangeParams) error {
	_, err := q.db.Exec(ctx, insertLibraryChange, arg.EntityType, arg.EntityID, arg.Op)
	return err
}

const insertLibraryChanges = `-- name: InsertLibraryChanges :exec
INSERT INTO library_changes (entity_type, entity_id, op)
SELECT $1::text,
       unnest($2::text[]),
       $3::text
`

type InsertLibraryChangesParams struct {
	EntityType string
	EntityIds  []string
	Op         string
}

// Batch form, for a mutation that touches many rows at once (the scan's
// reconcile pass can mark up to a quarter of a library missing in one go). A
// loop of single inserts would be thousands of round-trips inside a scan that
// is already the slow path.
func (q *Queries) InsertLibraryChanges(ctx context.Context, arg InsertLibraryChangesParams) error {
	_, err := q.db.Exec(ctx, insertLibraryChanges, arg.EntityType, arg.EntityIds, arg.Op)
	return err
}