package persistence

import (
	"context"
	"database/sql"
	"testing"
	"time"

	_ "github.com/mattn/go-sqlite3"

	"go.yandata.net/iod/iod/go-trustlog/api/logger"
)

func TestPersistenceManager_DBOnly(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyDBOnly,
	}

	manager := NewPersistenceManager(db, config, log)
	if manager == nil {
		t.Fatal("failed to create PersistenceManager")
	}

	op := createTestOperation(t, "manager-test-001")

	err := manager.SaveOperation(ctx, op)
	if err != nil {
		t.Fatalf("failed to save operation: %v", err)
	}

	// 验证已保存到数据库
	var count int
	err = db.QueryRowContext(ctx, "SELECT COUNT(*) FROM operation WHERE op_id = ?", "manager-test-001").Scan(&count)
	if err != nil {
		t.Fatalf("failed to query database: %v", err)
	}

	if count != 1 {
		t.Errorf("expected 1 record, got %d", count)
	}
}

func TestPersistenceManager_TrustlogOnly(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyTrustlogOnly,
	}

	manager := NewPersistenceManager(db, config, log)
	if manager == nil {
		t.Fatal("failed to create PersistenceManager")
	}

	op := createTestOperation(t, "manager-test-002")

	err := manager.SaveOperation(ctx, op)
	if err != nil {
		t.Fatalf("failed to save operation: %v", err)
	}

	// TrustlogOnly 不会保存到数据库，应该查不到
	var count int
	err = db.QueryRowContext(ctx, "SELECT COUNT(*) FROM operation WHERE op_id = ?", "manager-test-002").Scan(&count)
	if err != nil {
		t.Fatalf("failed to query database: %v", err)
	}

	if count != 0 {
		t.Errorf("expected 0 records (TrustlogOnly should not save to DB), got %d", count)
	}
}

func TestPersistenceManager_DBAndTrustlog(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyDBAndTrustlog,
	}

	manager := NewPersistenceManager(db, config, log)
	if manager == nil {
		t.Fatal("failed to create PersistenceManager")
	}

	op := createTestOperation(t, "manager-test-003")

	err := manager.SaveOperation(ctx, op)
	if err != nil {
		t.Fatalf("failed to save operation: %v", err)
	}

	// DBAndTrustlog 会保存到数据库，状态为 NOT_TRUSTLOGGED
	var status string
	err = db.QueryRowContext(ctx, "SELECT trustlog_status FROM operation WHERE op_id = ?", "manager-test-003").Scan(&status)
	if err != nil {
		t.Fatalf("failed to query database: %v", err)
	}

	if status != "NOT_TRUSTLOGGED" {
		t.Errorf("expected status to be NOT_TRUSTLOGGED, got %s", status)
	}
}

func TestPersistenceManager_GetRepositories(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyDBOnly,
	}

	manager := NewPersistenceManager(db, config, log)

	// 测试获取各个 Repository
	opRepo := manager.GetOperationRepo()
	if opRepo == nil {
		t.Error("GetOperationRepo returned nil")
	}

	cursorRepo := manager.GetCursorRepo()
	if cursorRepo == nil {
		t.Error("GetCursorRepo returned nil")
	}

	retryRepo := manager.GetRetryRepo()
	if retryRepo == nil {
		t.Error("GetRetryRepo returned nil")
	}
}

func TestPersistenceManager_Close(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyDBOnly,
	}

	manager := NewPersistenceManager(db, config, log)

	err := manager.Close()
	if err != nil {
		t.Errorf("Close returned error: %v", err)
	}
}

func TestPersistenceManager_InitSchema(t *testing.T) {
	// 创建一个空数据库
	db, err := sql.Open("sqlite3", ":memory:")
	if err != nil {
		t.Fatalf("failed to open database: %v", err)
	}
	defer db.Close()

	log := logger.GetGlobalLogger()

	config := PersistenceConfig{
		Strategy: StrategyDBOnly,
	}

	manager := NewPersistenceManager(db, config, log)

	// 手动调用 InitSchema（如果 NewPersistenceManager 没有自动调用）
	err = manager.InitSchema(context.Background(), "sqlite3")
	if err != nil {
		t.Fatalf("InitSchema failed: %v", err)
	}

	// 验证表已创建
	var count int
	err = db.QueryRow("SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='operation'").Scan(&count)
	if err != nil {
		t.Fatalf("failed to query schema: %v", err)
	}

	if count != 1 {
		t.Errorf("expected operation table to exist, got count=%d", count)
	}
}

func TestOperationRepository_SaveTx(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()
	repo := NewOperationRepository(db, log)

	// 开始事务
	tx, err := db.BeginTx(ctx, nil)
	if err != nil {
		t.Fatalf("failed to begin transaction: %v", err)
	}

	op := createTestOperation(t, "tx-test-001")

	// 在事务中保存
	err = repo.SaveTx(ctx, tx, op, StatusNotTrustlogged)
	if err != nil {
		tx.Rollback()
		t.Fatalf("failed to save operation in transaction: %v", err)
	}

	// 提交事务
	err = tx.Commit()
	if err != nil {
		t.Fatalf("failed to commit transaction: %v", err)
	}

	// 验证保存成功
	savedOp, _, err := repo.FindByID(ctx, "tx-test-001")
	if err != nil {
		t.Fatalf("failed to find operation: %v", err)
	}

	if savedOp.OpID != "tx-test-001" {
		t.Errorf("expected OpID to be 'tx-test-001', got %s", savedOp.OpID)
	}
}

func TestOperationRepository_SaveTxRollback(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()
	repo := NewOperationRepository(db, log)

	// 开始事务
	tx, err := db.BeginTx(ctx, nil)
	if err != nil {
		t.Fatalf("failed to begin transaction: %v", err)
	}

	op := createTestOperation(t, "tx-test-002")

	// 在事务中保存
	err = repo.SaveTx(ctx, tx, op, StatusNotTrustlogged)
	if err != nil {
		tx.Rollback()
		t.Fatalf("failed to save operation in transaction: %v", err)
	}

	// 回滚事务
	err = tx.Rollback()
	if err != nil {
		t.Fatalf("failed to rollback transaction: %v", err)
	}

	// 验证未保存
	_, _, err = repo.FindByID(ctx, "tx-test-002")
	if err == nil {
		t.Error("expected error when finding rolled back operation, got nil")
	}
}

func TestRetryRepository_AddRetryTx(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	ctx := context.Background()
	log := logger.GetGlobalLogger()
	repo := NewRetryRepository(db, log)

	// 开始事务
	tx, err := db.BeginTx(ctx, nil)
	if err != nil {
		t.Fatalf("failed to begin transaction: %v", err)
	}

	nextRetry := time.Now().Add(-1 * time.Second)
	err = repo.AddRetryTx(ctx, tx, "tx-retry-001", "test error", nextRetry)
	if err != nil {
		tx.Rollback()
		t.Fatalf("failed to add retry in transaction: %v", err)
	}

	// 提交事务
	err = tx.Commit()
	if err != nil {
		t.Fatalf("failed to commit transaction: %v", err)
	}

	// 验证已保存
	records, err := repo.FindPendingRetries(ctx, 10)
	if err != nil {
		t.Fatalf("failed to find pending retries: %v", err)
	}

	found := false
	for _, record := range records {
		if record.OpID == "tx-retry-001" {
			found = true
			break
		}
	}

	if !found {
		t.Error("expected to find retry record 'tx-retry-001'")
	}
}

func TestGetDialectDDL_AllDrivers(t *testing.T) {
	drivers := []string{"sqlite3", "postgres", "mysql"}

	for _, driver := range drivers {
		t.Run(driver, func(t *testing.T) {
			opDDL, cursorDDL, retryDDL, err := GetDialectDDL(driver)
			if err != nil {
				t.Fatalf("GetDialectDDL(%s) failed: %v", driver, err)
			}

			if opDDL == "" {
				t.Errorf("opDDL is empty for driver %s", driver)
			}

			if cursorDDL == "" {
				t.Errorf("cursorDDL is empty for driver %s", driver)
			}

			if retryDDL == "" {
				t.Errorf("retryDDL is empty for driver %s", driver)
			}
		})
	}
}

func TestGetDialectDDL_UnknownDriver(t *testing.T) {
	// GetDialectDDL 对未知驱动返回通用 SQL（而不是错误）
	opDDL, cursorDDL, retryDDL, err := GetDialectDDL("unknown-driver")
	if err != nil {
		t.Fatalf("GetDialectDDL should not error for unknown driver, got: %v", err)
	}

	// 应该返回非空的 DDL
	if opDDL == "" {
		t.Error("expected non-empty operation DDL")
	}

	if cursorDDL == "" {
		t.Error("expected non-empty cursor DDL")
	}

	if retryDDL == "" {
		t.Error("expected non-empty retry DDL")
	}
}