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package main
import (
"database/sql"
"fmt"
"os"
"path/filepath"
"regexp"
"strings"
_ "modernc.org/sqlite"
)
var nonFTS5 = regexp.MustCompile(`[^a-zA-Z0-9\s\*]+`)
// Journal represents a single journal entry.
type Journal struct {
ID int64 `json:"id"`
FullName string `json:"full_name"`
Abbreviation string `json:"abbreviation"`
}
// DB wraps a SQLite connection.
type DB struct {
conn *sql.DB
}
// OpenDB opens or creates the SQLite database at the given path.
func OpenDB(path string) (*DB, error) {
// Ensure parent directory exists
dir := filepath.Dir(path)
if dir != "." && dir != "/" {
if err := os.MkdirAll(dir, 0755); err != nil {
return nil, fmt.Errorf("failed to create data directory: %w", err)
}
}
conn, err := sql.Open("sqlite", path)
if err != nil {
return nil, fmt.Errorf("failed to open database: %w", err)
}
conn.SetMaxOpenConns(1) // SQLite prefers single writer
conn.SetMaxIdleConns(1)
if err := conn.Ping(); err != nil {
return nil, fmt.Errorf("failed to ping database: %w", err)
}
db := &DB{conn: conn}
if err := db.initSchema(); err != nil {
conn.Close()
return nil, fmt.Errorf("failed to init schema: %w", err)
}
return db, nil
}
// initSchema creates the journals table and FTS5 virtual table.
func (db *DB) initSchema() error {
stmts := []string{
`CREATE TABLE IF NOT EXISTS journals (
id INTEGER PRIMARY KEY AUTOINCREMENT,
full_name TEXT NOT NULL,
abbreviation TEXT NOT NULL
);`,
`CREATE VIRTUAL TABLE IF NOT EXISTS journals_fts USING fts5(
full_name, abbreviation,
content='journals',
content_rowid='id'
);`,
}
for _, stmt := range stmts {
if _, err := db.conn.Exec(stmt); err != nil {
return fmt.Errorf("schema init failed: %w", err)
}
}
return nil
}
// Close closes the database connection.
func (db *DB) Close() error {
return db.conn.Close()
}
// InsertJournals inserts a batch of journals in a single transaction.
func (db *DB) InsertJournals(journals []Journal) error {
if len(journals) == 0 {
return nil
}
tx, err := db.conn.Begin()
if err != nil {
return err
}
defer tx.Rollback()
insertStmt, err := tx.Prepare("INSERT INTO journals (full_name, abbreviation) VALUES (?, ?)")
if err != nil {
return err
}
defer insertStmt.Close()
ftsStmt, err := tx.Prepare("INSERT INTO journals_fts (rowid, full_name, abbreviation) VALUES (?, ?, ?)")
if err != nil {
return err
}
defer ftsStmt.Close()
for _, j := range journals {
res, err := insertStmt.Exec(j.FullName, j.Abbreviation)
if err != nil {
return fmt.Errorf("insert failed for %q: %w", j.FullName, err)
}
rowid, err := res.LastInsertId()
if err != nil {
return fmt.Errorf("last insert id failed: %w", err)
}
if _, err := ftsStmt.Exec(rowid, j.FullName, j.Abbreviation); err != nil {
return fmt.Errorf("fts insert failed for %q: %w", j.FullName, err)
}
}
return tx.Commit()
}
func sanitizeFTS5(query string) string {
clean := nonFTS5.ReplaceAllString(query, " ")
tokens := strings.Fields(clean)
for i, t := range tokens {
t = strings.ToLower(t)
if t != "*" && !strings.HasSuffix(t, "*") {
t = t + "*"
}
tokens[i] = t
}
return strings.Join(tokens, " ")
}
// SearchJournals searches for journals matching the query using FTS5.
func (db *DB) SearchJournals(query string, limit int) ([]Journal, error) {
if limit <= 0 {
limit = 50
}
if limit > 200 {
limit = 200
}
clean := sanitizeFTS5(query)
if clean == "" {
return []Journal{}, nil
}
// FTS5 content tables don't store original data, so we must join back to the
// main journals table to retrieve full_name and abbreviation columns.
rows, err := db.conn.Query(`
SELECT j.id, j.full_name, j.abbreviation
FROM journals j
JOIN (
SELECT rowid FROM journals_fts WHERE journals_fts MATCH ? ORDER BY rank LIMIT ?
) fts ON j.id = fts.rowid
`, clean, limit)
if err != nil {
return nil, err
}
defer rows.Close()
results := []Journal{}
for rows.Next() {
var j Journal
if err := rows.Scan(&j.ID, &j.FullName, &j.Abbreviation); err != nil {
return nil, err
}
results = append(results, j)
}
return results, rows.Err()
}
func (db *DB) Count() (int64, error) {
var count int64
err := db.conn.QueryRow("SELECT COUNT(*) FROM journals").Scan(&count)
return count, err
}
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