package database

import (
	"bytes"
	"database/sql"
	"log/slog"
	"path/filepath"
	"strings"
	"testing"

	_ "modernc.org/sqlite" // SQLite driver registration
)

// TestApplyMigrations_SecondRunAppliesNothing applies the migrations twice
// to one database file, as happens when pixad starts again on the database
// it created, and checks that the second run applies none of them.
// ApplyMigrations logs a message starting with "applying" before it runs
// any migration, the bootstrap one included.
func TestApplyMigrations_SecondRunAppliesNothing(t *testing.T) {
	t.Parallel()

	ctx := t.Context()

	db, err := sql.Open("sqlite", filepath.Join(t.TempDir(), "state.sqlite3"))
	if err != nil {
		t.Fatalf("failed to open test db: %v", err)
	}

	t.Cleanup(func() { _ = db.Close() })

	var firstLog bytes.Buffer

	err = ApplyMigrations(ctx, db, slog.New(slog.NewTextHandler(&firstLog, nil)))
	if err != nil {
		t.Fatalf("first ApplyMigrations failed: %v", err)
	}

	if !strings.Contains(firstLog.String(), "applying") {
		t.Fatalf("first ApplyMigrations logged no applied migration:\n%s",
			firstLog.String())
	}

	var secondLog bytes.Buffer

	err = ApplyMigrations(ctx, db, slog.New(slog.NewTextHandler(&secondLog, nil)))
	if err != nil {
		t.Fatalf("second ApplyMigrations failed: %v", err)
	}

	if strings.Contains(secondLog.String(), "applying") {
		t.Errorf("second ApplyMigrations ran a migration again:\n%s",
			secondLog.String())
	}
}