package database

import (
	"context"
	"os"
	"strings"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgxpool"
)

// Integration testing uses a disposable schema on an explicitly provided test database.
func TestMigrationIntegration(t *testing.T) {
	dsn := os.Getenv("VEYRA_TEST_DATABASE_URL")
	if dsn == "" {
		t.Skip("set VEYRA_TEST_DATABASE_URL to run PostgreSQL integration tests")
	}
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	admin, err := pgxpool.New(ctx, dsn)
	if err != nil {
		t.Fatal(err)
	}
	defer admin.Close()
	schema := "veyra_test_" + strings.ReplaceAll(uuid.NewString(), "-", "")
	if _, err := admin.Exec(ctx, "CREATE SCHEMA "+schema); err != nil {
		t.Fatal(err)
	}
	defer func() {
		if _, err := admin.Exec(context.Background(), "DROP SCHEMA "+schema+" CASCADE"); err != nil {
			t.Error(err)
		}
	}()
	cfg, err := pgxpool.ParseConfig(dsn)
	if err != nil {
		t.Fatal(err)
	}
	cfg.ConnConfig.RuntimeParams["search_path"] = schema
	pool, err := pgxpool.NewWithConfig(ctx, cfg)
	if err != nil {
		t.Fatal(err)
	}
	defer pool.Close()
	for i := 0; i < 2; i++ {
		if err := Migrate(ctx, pool); err != nil {
			t.Fatal(err)
		}
	}
	var count int
	if err := pool.QueryRow(ctx, "SELECT count(*) FROM veyra_schema_migration").Scan(&count); err != nil || count != 2 {
		t.Fatalf("migration ledger count=%d err=%v", count, err)
	}
	if _, err := pool.Exec(ctx, "INSERT INTO veyra_user(id,display_name) VALUES($1,$2)", uuid.NewString(), "Test"); err != nil {
		t.Fatal(err)
	}
	if _, err := pool.Exec(ctx, "INSERT INTO veyra_user(id,display_name) VALUES('invalid','Test')"); err == nil {
		t.Fatal("invalid UUID was accepted")
	}
	if _, err := pool.Exec(ctx, "UPDATE veyra_schema_migration SET checksum='changed'"); err != nil {
		t.Fatal(err)
	}
	if err := Migrate(ctx, pool); err == nil {
		t.Fatal("modified migration checksum was accepted")
	}
}