package database

import (
	"regexp"
	"testing"
)

// TestParseTableNamesIgnoresComments guards against phantom tables parsed out
// of SQL comments (e.g. "-- ... declared in CREATE TABLE above" once
// registered a table named "above" and crashed startup verification).
func TestParseTableNamesIgnoresComments(t *testing.T) {
	tables, err := parseTableNames()
	if err != nil {
		t.Fatalf("parseTableNames() error: %v", err)
	}
	if len(tables) == 0 {
		t.Fatal("parseTableNames() returned no tables")
	}

	for _, name := range tables {
		// Every parsed table must correspond to a real CREATE TABLE statement
		// at the start of a (non-comment) line.
		stmt := regexp.MustCompile(`(?m)^CREATE TABLE (?:IF NOT EXISTS )?(?:\w+\.)?` + regexp.QuoteMeta(name) + `\s`)
		if !stmt.MatchString(SchemaFile) {
			t.Errorf("parseTableNames() returned phantom table %q with no matching CREATE TABLE statement", name)
		}
	}
}