package db

import (
	"os"
	"path/filepath"
	"testing"
)

func testStore(t *testing.T) *Store {
	t.Helper()
	path := filepath.Join(t.TempDir(), "test.db")
	s, err := Open(path)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	t.Cleanup(func() { s.Close() })
	return s
}

func TestOpen_CreatesFile(t *testing.T) {
	path := filepath.Join(t.TempDir(), "test.db")
	s, err := Open(path)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	defer s.Close()

	if _, err := os.Stat(path); os.IsNotExist(err) {
		t.Fatal("database file not created")
	}
}

func TestOpen_WALMode(t *testing.T) {
	s := testStore(t)
	var mode string
	if err := s.db.QueryRow("PRAGMA journal_mode").Scan(&mode); err != nil {
		t.Fatal(err)
	}
	if mode != "wal" {
		t.Errorf("expected wal, got %s", mode)
	}
}

func TestOpen_ForeignKeys(t *testing.T) {
	s := testStore(t)
	var fk int
	if err := s.db.QueryRow("PRAGMA foreign_keys").Scan(&fk); err != nil {
		t.Fatal(err)
	}
	if fk != 1 {
		t.Errorf("expected foreign_keys=1, got %d", fk)
	}
}

func TestOpen_MigrateIdempotent(t *testing.T) {
	path := filepath.Join(t.TempDir(), "test.db")
	s1, err := Open(path)
	if err != nil {
		t.Fatalf("first Open: %v", err)
	}
	s1.Close()

	s2, err := Open(path)
	if err != nil {
		t.Fatalf("second Open: %v", err)
	}
	s2.Close()
}

func TestDefaultPath_EnvOverride(t *testing.T) {
	want := "/tmp/custom-nib.db"
	t.Setenv("NIB_DB", want)
	got, err := DefaultPath()
	if err != nil {
		t.Fatal(err)
	}
	if got != want {
		t.Errorf("expected %s, got %s", want, got)
	}
}