package db_test

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

	"qbank/internal/config"
	"qbank/internal/db"
)

func TestOpenAndSeed(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "test.db")

	database, err := db.Open(dbPath)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	defer database.Close()

	// All tables must exist.
	tables := []string{"users", "questions", "answers", "tests", "test_answers", "user_question_stats"}
	for _, table := range tables {
		var name string
		err := database.QueryRow(
			"SELECT name FROM sqlite_master WHERE type='table' AND name=?", table,
		).Scan(&name)
		if err != nil {
			t.Errorf("table %q missing: %v", table, err)
		}
	}

	// Seed two users.
	users := []config.AdminUser{
		{Name: "alice", Password: "pass1"},
		{Name: "bob", Password: "pass2"},
	}
	if err := db.Seed(database, users); err != nil {
		t.Fatalf("Seed: %v", err)
	}

	var count int
	database.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
	if count != 2 {
		t.Errorf("want 2 users, got %d", count)
	}

	// Second Seed call must be a no-op (users table non-empty).
	if err := db.Seed(database, users); err != nil {
		t.Fatalf("second Seed: %v", err)
	}
	database.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
	if count != 2 {
		t.Errorf("after second seed: want 2 users, got %d", count)
	}

	// GetUserByName must find alice.
	repo := db.New(database)
	u, err := repo.GetUserByName("alice")
	if err != nil {
		t.Fatalf("GetUserByName: %v", err)
	}
	if u.Name != "alice" {
		t.Errorf("want alice, got %q", u.Name)
	}
	if u.PasswordHash == "" {
		t.Error("password hash is empty")
	}

	_ = os.Remove(dbPath)
}