package persistence_test

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

	_ "github.com/lib/pq"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

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

const (
	// PostgreSQL 连接配置
	postgresHost     = "localhost"
	postgresPort     = 5432
	postgresUser     = "postgres"
	postgresPassword = "postgres"
	postgresDatabase = "trustlog"

	// Pulsar 连接配置
	pulsarURL   = "pulsar://localhost:6650"
	pulsarTopic = "trustlog-integration-test"
)

// TestIntegration_PostgreSQL_Basic 测试基本的 PostgreSQL 持久化功能
func TestIntegration_PostgreSQL_Basic(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

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

	// 创建数据库连接
	dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		postgresHost, postgresPort, postgresUser, postgresPassword, postgresDatabase)
	
	db, err := sql.Open("postgres", dsn)
	require.NoError(t, err, "Failed to connect to PostgreSQL")
	defer db.Close()

	// 测试连接
	err = db.PingContext(ctx)
	require.NoError(t, err, "Failed to ping PostgreSQL")

	// 创建持久化客户端（仅落库策略）
	config := persistence.PersistenceClientConfig{
		DBConfig: persistence.DBConfig{
			DSN:          dsn,
			DriverName:   "postgres",
			MaxOpenConns: 10,
		},
		PersistenceConfig: persistence.PersistenceConfig{
			Strategy: persistence.StrategyDBOnly,
		},
		Logger: log,
	}

	client, err := persistence.NewPersistenceClient(ctx, config)
	require.NoError(t, err, "Failed to create persistence client")
	defer client.Close()

	// 创建测试 Operation
	now := time.Now()
	clientIP := "192.168.1.100"
	serverIP := "10.0.0.1"
	
	operation := &model.Operation{
		OpID:      fmt.Sprintf("test-op-%d", now.Unix()),
		Timestamp: now,
		OpSource:  model.OpSourceDOIP,
		OpType:    model.OpTypeCreate,
		DoPrefix:  "test",
		ClientIP:  &clientIP,
		ServerIP:  &serverIP,
	}

	// 存储 Operation
	err = client.OperationPublish(ctx, operation)
	require.NoError(t, err, "Failed to publish operation")

	// 等待一小段时间确保写入完成
	time.Sleep(100 * time.Millisecond)

	// 从数据库查询验证
	var count int
	err = db.QueryRowContext(ctx, "SELECT COUNT(*) FROM operation WHERE op_id = $1", operation.OpID).Scan(&count)
	require.NoError(t, err, "Failed to query operation")
	assert.Equal(t, 1, count, "Operation should be stored in database")

	// 验证 IP 字段
	var storedClientIP, storedServerIP sql.NullString
	err = db.QueryRowContext(ctx, 
		"SELECT client_ip, server_ip FROM operation WHERE op_id = $1", 
		operation.OpID).Scan(&storedClientIP, &storedServerIP)
	require.NoError(t, err, "Failed to query IP fields")
	
	assert.True(t, storedClientIP.Valid, "ClientIP should be valid")
	assert.Equal(t, clientIP, storedClientIP.String, "ClientIP should match")
	assert.True(t, storedServerIP.Valid, "ServerIP should be valid")
	assert.Equal(t, serverIP, storedServerIP.String, "ServerIP should match")

	t.Logf("✅ PostgreSQL basic test passed")
}

// TestIntegration_PostgreSQL_NullableIP 测试可空 IP 字段
func TestIntegration_PostgreSQL_NullableIP(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

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

	dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		postgresHost, postgresPort, postgresUser, postgresPassword, postgresDatabase)
	
	db, err := sql.Open("postgres", dsn)
	require.NoError(t, err)
	defer db.Close()

	config := persistence.PersistenceClientConfig{
		DBConfig: persistence.DBConfig{
			DSN:     dsn,
		DriverName:   "postgres",
		MaxOpenConns: 10,
		},
		PersistenceConfig: persistence.PersistenceConfig{
			Strategy: persistence.StrategyDBOnly,
		},
	}

	client, err := persistence.NewPersistenceClient(ctx, config)
	require.NoError(t, err)
	defer client.Close()

	// 创建不带 IP 的 Operation
	now := time.Now()
	operation := &model.Operation{
		OpID:      fmt.Sprintf("test-op-noip-%d", now.Unix()),
		Timestamp: now,
		OpSource:  model.OpSourceDOIP,
		OpType:    model.OpTypeUpdate,
		DoPrefix:  "test",
		// ClientIP 和 ServerIP 为 nil
	}

	err = client.OperationPublish(ctx, operation)
	require.NoError(t, err)

	time.Sleep(100 * time.Millisecond)

	// 验证 IP 字段为 NULL
	var storedClientIP, storedServerIP sql.NullString
	err = db.QueryRowContext(ctx,
		"SELECT client_ip, server_ip FROM operation WHERE op_id = $1",
		operation.OpID).Scan(&storedClientIP, &storedServerIP)
	require.NoError(t, err)
	
	assert.False(t, storedClientIP.Valid, "ClientIP should be NULL")
	assert.False(t, storedServerIP.Valid, "ServerIP should be NULL")

	t.Logf("✅ PostgreSQL nullable IP test passed")
}

// TestIntegration_Pulsar_PostgreSQL 测试 Pulsar + PostgreSQL 集成
func TestIntegration_Pulsar_PostgreSQL(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	log := logger.NewNopLogger()

	// PostgreSQL 配置
	dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		postgresHost, postgresPort, postgresUser, postgresPassword, postgresDatabase)
	
	db, err := sql.Open("postgres", dsn)
	require.NoError(t, err)
	defer db.Close()

	err = db.PingContext(ctx)
	require.NoError(t, err)

	// 创建 Pulsar publisher
	pulsarConfig := adapter.PublisherConfig{
		Logger:       log,
		URL:          pulsarURL,
		Topic:        pulsarTopic,
		ProducerName: "integration-test-producer",
	}

	publisher, err := adapter.NewPublisher(ctx, pulsarConfig)
	require.NoError(t, err, "Failed to create Pulsar publisher")
	defer publisher.Close()

	// 创建持久化客户端（DB + Trustlog 策略）
	config := persistence.PersistenceClientConfig{
		DBConfig: persistence.DBConfig{
			DSN:     dsn,
		DriverName:   "postgres",
		MaxOpenConns: 10,
		},
		PersistenceConfig: persistence.PersistenceConfig{
			Strategy: persistence.StrategyDBAndTrustlog,
		},
		EnableCursorWorker: true,
		CursorWorkerConfig: persistence.CursorWorkerConfig{
			ScanInterval:   5 * time.Second,
			BatchSize:      10,
			MaxRetries:     3,
			RetryInterval:  2 * time.Second,
			InitialBackoff: 1 * time.Second,
			MaxBackoff:     10 * time.Second,
		},
		EnableRetryWorker: true,
		RetryWorkerConfig: persistence.RetryWorkerConfig{
			CheckInterval: 5 * time.Second,
			BatchSize:     10,
			MaxRetries:    5,
			InitialDelay:  1 * time.Minute,
			MaxDelay:      1 * time.Hour,
			BackoffFactor: 2.0,
		},
	}

	client, err := persistence.NewPersistenceClient(ctx, config)
	require.NoError(t, err)
	defer client.Close()

	// 设置 publisher
	client.SetPublisher(publisher)

	// 创建测试 Operation
	now := time.Now()
	clientIP := "172.16.0.100"
	
	operation := &model.Operation{
		OpID:      fmt.Sprintf("pulsar-test-%d", now.Unix()),
		Timestamp: now,
		OpSource:  model.OpSourceDOIP,
		OpType:    model.OpTypeCreate,
		DoPrefix:  "integration",
		ClientIP:  &clientIP,
	}

	// 发布 Operation（应该同时写入 DB 和 Pulsar）
	err = client.OperationPublish(ctx, operation)
	require.NoError(t, err)

	// 等待异步处理
	time.Sleep(2 * time.Second)

	// 验证 DB 中存在记录
	var count int
	err = db.QueryRowContext(ctx, "SELECT COUNT(*) FROM operation WHERE op_id = $1", operation.OpID).Scan(&count)
	require.NoError(t, err)
	assert.Equal(t, 1, count, "Operation should be in database")

	// 验证 trustlog_status 初始为 NOT_TRUSTLOGGED
	var status string
	err = db.QueryRowContext(ctx, "SELECT trustlog_status FROM operation WHERE op_id = $1", operation.OpID).Scan(&status)
	require.NoError(t, err)
	assert.Equal(t, "NOT_TRUSTLOGGED", status, "Initial status should be NOT_TRUSTLOGGED")

	t.Logf("✅ Pulsar + PostgreSQL integration test passed")
}

// TestIntegration_CursorWorker 测试 Cursor Worker 功能
func TestIntegration_CursorWorker(t *testing.T) {
	if testing.Short() {
		t.Skip("Skipping integration test in short mode")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Minute)
	defer cancel()

	log := logger.NewNopLogger()

	dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		postgresHost, postgresPort, postgresUser, postgresPassword, postgresDatabase)
	
	db, err := sql.Open("postgres", dsn)
	require.NoError(t, err)
	defer db.Close()

	// 创建带 Cursor Worker 的持久化客户端
	config := persistence.PersistenceClientConfig{
		DBConfig: persistence.DBConfig{
			DSN:     dsn,
		DriverName:   "postgres",
		MaxOpenConns: 10,
		},
		PersistenceConfig: persistence.PersistenceConfig{
			Strategy: persistence.StrategyDBAndTrustlog,
		},
		EnableCursorWorker: true,
		CursorWorkerConfig: persistence.CursorWorkerConfig{
			ScanInterval:   2 * time.Second, // 更频繁的扫描用于测试
			BatchSize:      10,
			MaxRetries:     3,
			RetryInterval:  1 * time.Second,
			InitialBackoff: 500 * time.Millisecond,
			MaxBackoff:     5 * time.Second,
		},
	}

	client, err := persistence.NewPersistenceClient(ctx, config)
	require.NoError(t, err)
	defer client.Close()

	// 创建 mock publisher
	pulsarConfig := adapter.PublisherConfig{
		Logger:       log,
		URL:          pulsarURL,
		Topic:        pulsarTopic + "-cursor",
		ProducerName: "cursor-test-producer",
	}

	publisher, err := adapter.NewPublisher(ctx, pulsarConfig)
	require.NoError(t, err)
	defer publisher.Close()

	client.SetPublisher(publisher)

	// 插入测试记录
	now := time.Now()
	operation := &model.Operation{
		OpID:      fmt.Sprintf("cursor-test-%d", now.Unix()),
		Timestamp: now,
		OpSource:  model.OpSourceDOIP,
		OpType:    model.OpTypeCreate,
		DoPrefix:  "cursor-test",
	}

	err = client.OperationPublish(ctx, operation)
	require.NoError(t, err)

	// 等待 Cursor Worker 处理
	time.Sleep(10 * time.Second)

	// 验证状态变化（可能已被处理）
	var status string
	err = db.QueryRowContext(ctx, "SELECT trustlog_status FROM operation WHERE op_id = $1", operation.OpID).Scan(&status)
	require.NoError(t, err)
	
	t.Logf("Operation status after cursor worker: %s", status)
	// 注意：由于 Pulsar 可能不可用，状态可能仍是 NOT_TRUSTLOGGED 或进入 retry 表

	t.Logf("✅ Cursor Worker test completed")
}