package wal

const sqlSchema = `
BEGIN IMMEDIATE;

CREATE TABLE IF NOT EXISTS wal(
  SeqNum     INTEGER NOT NULL PRIMARY KEY,
  CreatedAt  INTEGER NOT NULL,
  Collection TEXT    NOT NULL,
  ID         INTEGER NOT NULL,
  Store      INTEGER NOT NULL,
  Data       BLOB
) WITHOUT ROWID;

CREATE INDEX IF NOT EXISTS wal_created_at_index ON wal(CreatedAt);

COMMIT;
`

const sqlWALMaxSeqNum = `
SELECT COALESCE(MAX(SeqNum), 0) FROM wal;
`

const sqlWALInsert = `
INSERT INTO wal(
  SeqNum,CreatedAt,Collection,ID,Store,Data
) VALUES (?,?,?,?,?,?)`

const sqlWALFollowQuery = `
SELECT
  SeqNum,Collection,ID,Store,Data
FROM
  wal
WHERE
  SeqNum > ?
ORDER BY SeqNum ASC`

const sqlWALDeleteQuery = `
DELETE FROM wal WHERE CreatedAt < ? AND SeqNum < (SELECT MAX(SeqNum) FROM wal)`