package persistence

import (
	"context"
	"errors"
	"fmt"

	"github.com/ThreeDotsLabs/watermill/message"

	"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"
)

// operationPublisherAdapter 适配器，将 PersistenceClient 的 publishToTrustlog 方法适配为 OperationPublisher 接口
type operationPublisherAdapter struct {
	client *PersistenceClient
}

func (a *operationPublisherAdapter) Publish(ctx context.Context, op *model.Operation) error {
	return a.client.publishToTrustlog(ctx, op)
}

// PersistenceClient 支持数据库持久化的存证客户端
// 在原有 HighClient 功能基础上，增加了数据库持久化支持
type PersistenceClient struct {
	publisher      message.Publisher
	logger         logger.Logger
	envelopeConfig model.EnvelopeConfig
	manager        *PersistenceManager
	cursorWorker   *CursorWorker
	retryWorker    *RetryWorker
}

// PersistenceClientConfig 客户端配置
type PersistenceClientConfig struct {
	// Publisher 消息发布器（用于存证）
	Publisher message.Publisher
	// Logger 日志记录器
	Logger logger.Logger
	// EnvelopeConfig SM2密钥配置（用于签名和序列化）
	EnvelopeConfig model.EnvelopeConfig
	// DBConfig 数据库配置
	DBConfig DBConfig
	// PersistenceConfig 持久化策略配置
	PersistenceConfig PersistenceConfig
	// CursorWorkerConfig Cursor工作器配置（可选）
	CursorWorkerConfig *CursorWorkerConfig
	// EnableCursorWorker 是否启用Cursor工作器（仅对 StrategyDBAndTrustlog 有效）
	EnableCursorWorker bool
	// RetryWorkerConfig 重试工作器配置（可选）
	RetryWorkerConfig *RetryWorkerConfig
	// EnableRetryWorker 是否启用重试工作器（仅对 StrategyDBAndTrustlog 有效）
	EnableRetryWorker bool
}

// NewPersistenceClient 创建支持数据库持久化的存证客户端
func NewPersistenceClient(ctx context.Context, config PersistenceClientConfig) (*PersistenceClient, error) {
	if config.Logger == nil {
		return nil, errors.New("logger is required")
	}

	// 创建数据库连接
	db, err := NewDB(config.DBConfig)
	if err != nil {
		config.Logger.ErrorContext(ctx, "failed to create database connection",
			"error", err,
		)
		return nil, fmt.Errorf("failed to create database connection: %w", err)
	}

	// 创建持久化管理器
	manager := NewPersistenceManager(db, config.PersistenceConfig, config.Logger)

	// 初始化数据库表结构
	if err := manager.InitSchema(ctx, config.DBConfig.DriverName); err != nil {
		db.Close()
		return nil, fmt.Errorf("failed to initialize database schema: %w", err)
	}

	client := &PersistenceClient{
		publisher:      config.Publisher,
		logger:         config.Logger,
		envelopeConfig: config.EnvelopeConfig,
		manager:        manager,
	}

	// 创建 Operation Publisher 适配器（将 PersistenceClient 的 publishToTrustlog 方法适配为 OperationPublisher 接口）
	opPublisher := &operationPublisherAdapter{
		client: client,
	}
	manager.SetPublisher(opPublisher)

	// 如果启用Cursor工作器且策略为 StrategyDBAndTrustlog
	if config.EnableCursorWorker && config.PersistenceConfig.Strategy == StrategyDBAndTrustlog {
		var workerConfig CursorWorkerConfig
		if config.CursorWorkerConfig != nil {
			workerConfig = *config.CursorWorkerConfig
		} else {
			workerConfig = DefaultCursorWorkerConfig()
		}

		// 确保 Enabled 字段被正确设置
		workerConfig.Enabled = true

		client.cursorWorker = NewCursorWorker(workerConfig, manager)
		if err := client.cursorWorker.Start(ctx); err != nil {
			db.Close()
			return nil, fmt.Errorf("failed to start cursor worker: %w", err)
		}

		config.Logger.InfoContext(ctx, "cursor worker started",
			"strategy", config.PersistenceConfig.Strategy.String(),
			"scanInterval", workerConfig.ScanInterval,
		)
	}

	// 如果启用重试工作器且策略为 StrategyDBAndTrustlog
	if config.EnableRetryWorker && config.PersistenceConfig.Strategy == StrategyDBAndTrustlog {
		var workerConfig RetryWorkerConfig
		if config.RetryWorkerConfig != nil {
			workerConfig = *config.RetryWorkerConfig
		} else {
			workerConfig = DefaultRetryWorkerConfig()
		}

		client.retryWorker = NewRetryWorker(workerConfig, manager, config.Publisher, config.Logger)
		go client.retryWorker.Start(ctx)

		config.Logger.InfoContext(ctx, "retry worker started",
			"strategy", config.PersistenceConfig.Strategy.String(),
			"retryInterval", workerConfig.RetryInterval,
		)
	}

	config.Logger.InfoContext(ctx, "persistence client created",
		"strategy", config.PersistenceConfig.Strategy.String(),
		"cursorEnabled", config.EnableCursorWorker,
		"retryEnabled", config.EnableRetryWorker,
	)

	return client, nil
}

// OperationPublish 发布操作记录
// 根据配置的策略，选择仅落库、既落库又存证或仅存证
func (c *PersistenceClient) OperationPublish(ctx context.Context, operation *model.Operation) error {
	if operation == nil {
		c.logger.ErrorContext(ctx, "operation publish failed: operation is nil")
		return errors.New("operation cannot be nil")
	}

	c.logger.DebugContext(ctx, "publishing operation with persistence",
		"opID", operation.OpID,
		"opType", operation.OpType,
		"strategy", c.manager.config.Strategy.String(),
	)

	strategy := c.manager.config.Strategy

	switch strategy {
	case StrategyDBOnly:
		// 仅落库
		return c.publishDBOnly(ctx, operation)

	case StrategyDBAndTrustlog:
		// 既落库又存证
		return c.publishDBAndTrustlog(ctx, operation)

	case StrategyTrustlogOnly:
		// 仅存证
		return c.publishTrustlogOnly(ctx, operation)

	default:
		return fmt.Errorf("unknown persistence strategy: %s", strategy.String())
	}
}

// publishDBOnly 仅落库策略
func (c *PersistenceClient) publishDBOnly(ctx context.Context, operation *model.Operation) error {
	c.logger.DebugContext(ctx, "publishing operation with DB_ONLY strategy",
		"opID", operation.OpID,
	)

	// 保存到数据库
	if err := c.manager.SaveOperation(ctx, operation); err != nil {
		c.logger.ErrorContext(ctx, "failed to save operation to database",
			"opID", operation.OpID,
			"error", err,
		)
		return err
	}

	c.logger.InfoContext(ctx, "operation saved with DB_ONLY strategy",
		"opID", operation.OpID,
	)
	return nil
}

// publishDBAndTrustlog 既落库又存证策略
func (c *PersistenceClient) publishDBAndTrustlog(ctx context.Context, operation *model.Operation) error {
	c.logger.DebugContext(ctx, "publishing operation with DB_AND_TRUSTLOG strategy",
		"opID", operation.OpID,
	)

	// 先保存到数据库（状态为未存证）
	if err := c.manager.SaveOperation(ctx, operation); err != nil {
		c.logger.ErrorContext(ctx, "failed to save operation to database",
			"opID", operation.OpID,
			"error", err,
		)
		return err
	}

	// 尝试发布到存证系统
	if err := c.publishToTrustlog(ctx, operation); err != nil {
		c.logger.WarnContext(ctx, "failed to publish to trustlog, will retry later",
			"opID", operation.OpID,
			"error", err,
		)
		// 发布失败，但数据库已保存，重试工作器会处理
		return nil
	}

	// 发布成功，更新状态为已存证
	if err := c.manager.GetOperationRepo().UpdateStatus(ctx, operation.OpID, StatusTrustlogged); err != nil {
		c.logger.ErrorContext(ctx, "failed to update operation status",
			"opID", operation.OpID,
			"error", err,
		)
		// 状态更新失败，但消息已发送，重试工作器会清理
	}

	// 删除重试记录（如果存在）
	c.manager.GetRetryRepo().DeleteRetry(ctx, operation.OpID)

	c.logger.InfoContext(ctx, "operation published with DB_AND_TRUSTLOG strategy",
		"opID", operation.OpID,
	)
	return nil
}

// publishTrustlogOnly 仅存证策略
func (c *PersistenceClient) publishTrustlogOnly(ctx context.Context, operation *model.Operation) error {
	c.logger.DebugContext(ctx, "publishing operation with TRUSTLOG_ONLY strategy",
		"opID", operation.OpID,
	)

	// 直接发布到存证系统
	if err := c.publishToTrustlog(ctx, operation); err != nil {
		c.logger.ErrorContext(ctx, "failed to publish to trustlog",
			"opID", operation.OpID,
			"error", err,
		)
		return err
	}

	c.logger.InfoContext(ctx, "operation published with TRUSTLOG_ONLY strategy",
		"opID", operation.OpID,
	)
	return nil
}

// publishToTrustlog 发布到存证系统（使用 Envelope 格式）
func (c *PersistenceClient) publishToTrustlog(ctx context.Context, operation *model.Operation) error {
	messageKey := operation.Key()

	c.logger.DebugContext(ctx, "starting envelope serialization",
		"messageKey", messageKey,
	)

	// 使用 Envelope 序列化
	envelopeData, err := model.MarshalTrustlog(operation, c.envelopeConfig)
	if err != nil {
		c.logger.ErrorContext(ctx, "envelope serialization failed",
			"messageKey", messageKey,
			"error", err,
		)
		return fmt.Errorf("failed to marshal envelope: %w", err)
	}

	c.logger.DebugContext(ctx, "envelope serialized successfully",
		"messageKey", messageKey,
		"envelopeSize", len(envelopeData),
	)

	msg := message.NewMessage(messageKey, envelopeData)
	c.logger.DebugContext(ctx, "publishing message to topic",
		"messageKey", messageKey,
		"topic", adapter.OperationTopic,
	)

	if publishErr := c.publisher.Publish(adapter.OperationTopic, msg); publishErr != nil {
		c.logger.ErrorContext(ctx, "failed to publish to topic",
			"messageKey", messageKey,
			"topic", adapter.OperationTopic,
			"error", publishErr,
		)
		return fmt.Errorf("failed to publish message to topic %s: %w", adapter.OperationTopic, publishErr)
	}

	c.logger.DebugContext(ctx, "message published to topic successfully",
		"messageKey", messageKey,
		"topic", adapter.OperationTopic,
	)
	return nil
}

// RecordPublish 发布记录（Record 类型不支持数据库持久化）
func (c *PersistenceClient) RecordPublish(ctx context.Context, record *model.Record) error {
	if record == nil {
		c.logger.ErrorContext(ctx, "record publish failed: record is nil")
		return errors.New("record cannot be nil")
	}

	c.logger.DebugContext(ctx, "publishing record",
		"recordID", record.ID,
		"rcType", record.RCType,
	)

	// Record 类型直接发布到存证系统，不落库
	messageKey := record.Key()

	envelopeData, err := model.MarshalTrustlog(record, c.envelopeConfig)
	if err != nil {
		c.logger.ErrorContext(ctx, "envelope serialization failed",
			"recordID", record.ID,
			"error", err,
		)
		return fmt.Errorf("failed to marshal envelope: %w", err)
	}

	msg := message.NewMessage(messageKey, envelopeData)
	if publishErr := c.publisher.Publish(adapter.RecordTopic, msg); publishErr != nil {
		c.logger.ErrorContext(ctx, "failed to publish record to topic",
			"recordID", record.ID,
			"error", publishErr,
		)
		return fmt.Errorf("failed to publish record to topic %s: %w", adapter.RecordTopic, publishErr)
	}

	c.logger.InfoContext(ctx, "record published successfully",
		"recordID", record.ID,
		"rcType", record.RCType,
	)
	return nil
}

// GetLow 获取底层 Publisher
func (c *PersistenceClient) GetLow() message.Publisher {
	return c.publisher
}

// GetManager 获取持久化管理器
func (c *PersistenceClient) GetManager() *PersistenceManager {
	return c.manager
}

// Close 关闭客户端
func (c *PersistenceClient) Close() error {
	ctx := context.Background()
	c.logger.Info("closing persistence client")

	// 停止Cursor工作器
	if c.cursorWorker != nil {
		if err := c.cursorWorker.Stop(ctx); err != nil {
			c.logger.Error("failed to stop cursor worker",
				"error", err,
			)
		}
	}

	// 停止重试工作器
	if c.retryWorker != nil {
		c.retryWorker.Stop()
	}

	// 关闭数据库连接
	if err := c.manager.Close(); err != nil {
		c.logger.Error("failed to close database",
			"error", err,
		)
		return err
	}

	// 关闭 Publisher（如果存在）
	if c.publisher != nil {
		if err := c.publisher.Close(); err != nil {
			c.logger.Error("failed to close publisher",
				"error", err,
			)
			return err
		}
	}

	c.logger.Info("persistence client closed successfully")
	return nil
}