package model

import (
	"fmt"
	"sync/atomic"
	"testing"

	"github.com/glebarez/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var testDBCounter int64

// OpenTestDB opens an in-memory SQLite DB with the v2 schema migrated.
// Shared by all package tests (pay has no prior DB test harness — this is it).
// Each call gets a uniquely named in-memory DB (cache=shared is still needed
// so GORM's connection pool sees the same migrated schema across connections),
// so concurrent/parallel tests in the same package don't share state.
func OpenTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	n := atomic.AddInt64(&testDBCounter, 1)
	// _txlock=immediate: BEGIN IMMEDIATE 让每个事务一开始就抢库级写锁(而非默认
	// BEGIN DEFERRED 推迟到首条写语句才抢),使并发事务在读阶段就串行化——守卫类
	// 事务(锁行/求和/校验/插入,见 RefundStore.CreateRefundGuarded)依赖此语义,
	// 呼应 pangolin 的 SQLite DSN 约定(server/internal/db/db.go)。
	// _pragma=busy_timeout(5000): 抢不到写锁时等待重试而非立即 SQLITE_BUSY 报错。
	dsn := fmt.Sprintf("file:testdb_%d?mode=memory&cache=shared&_txlock=immediate&_pragma=busy_timeout(5000)", n)
	db, err := gorm.Open(sqlite.Open(dsn),
		&gorm.Config{Logger: logger.Default.LogMode(logger.Silent), TranslateError: true})
	if err != nil {
		t.Fatalf("open test db: %v", err)
	}
	if err := db.AutoMigrate(&OrderV2{}, &Attempt{}, &Account{}, &Refund{}, &WebhookDelivery{},
		&Product{}, &ProductPrice{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}
	if err := UpgradeWebhookDeliveryIndex(db); err != nil {
		t.Fatalf("upgrade webhook_deliveries uq_delivery index: %v", err)
	}
	sqlDB, _ := db.DB()
	t.Cleanup(func() { _ = sqlDB.Close() })
	return db
}