package consumer

import (
	"fmt"
	"log"
	"sync"

	"git.x2erp.com/qdy/go-base/types"
	"git.x2erp.com/qdy/go-db/factory/rabbitmq"

	"git.x2erp.com/qdy/go-svc-mqconsumer/handlers"
)

// ConsumerManager 消费者管理器
type ConsumerManager struct {
	rabbitFactory *rabbitmq.RabbitMQFactory
	consumers     sync.Map // consumerID -> *rabbitmq.Consumer
	handler       *handlers.HTTPHandler
}

// NewConsumerManager 创建消费者管理器
func NewConsumerManager(rabbitFactory *rabbitmq.RabbitMQFactory) *ConsumerManager {
	return &ConsumerManager{
		rabbitFactory: rabbitFactory,
		handler:       handlers.NewHTTPHandler(),
	}
}

// StartAllConsumers 启动所有消费者
func (cm *ConsumerManager) StartAllConsumers() error {
	queueConfigs, err := config.GetQueueConfigsFromDB()
	if err != nil {
		return fmt.Errorf("failed to load config: %v", err)
	}
	log.Printf("Starting %d consumers...", len(queueConfigs))

	for _, config := range queueConfigs {
		if err := cm.StartConsumer(config); err != nil {
			log.Printf("Failed to start consumer for queue %s: %v", config.QueueName, err)
			continue
		}
		log.Printf("Consumer started for queue: %s", config.QueueName)
	}

	return nil
}

// StartConsumer 启动单个消费者
func (cm *ConsumerManager) StartConsumer(queueReq types.QueueRequest) error {
	// 生成消费者ID
	consumerID := fmt.Sprintf("%s_consumer", queueReq.QueueName)

	// 检查是否已存在
	if _, exists := cm.consumers.Load(consumerID); exists {
		return fmt.Errorf("consumer %s already exists", consumerID)
	}

	// 创建消费者
	consumer, err := cm.rabbitFactory.CreateConsumer(&queueReq, consumerID, cm.handler)
	if err != nil {
		return fmt.Errorf("failed to create consumer: %v", err)
	}

	// 保存消费者
	cm.consumers.Store(consumerID, consumer)
	log.Printf("Consumer %s started for queue %s", consumerID, queueReq.QueueName)

	return nil
}

// StopConsumer 停止指定消费者
func (cm *ConsumerManager) StopConsumer(consumerID string) error {
	// 获取消费者
	consumerInterface, exists := cm.consumers.Load(consumerID)
	if !exists {
		return fmt.Errorf("consumer %s not found", consumerID)
	}

	consumer := consumerInterface.(*rabbitmq.Consumer)

	// 关闭通道
	if err := consumer.Channel.Close(); err != nil {
		return fmt.Errorf("failed to close channel: %v", err)
	}

	// 从map中移除
	cm.consumers.Delete(consumerID)

	// 关闭RabbitMQ通道
	if err := cm.rabbitFactory.CloseChannel(consumerID); err != nil {
		log.Printf("Warning: failed to close RabbitMQ channel %s: %v", consumerID, err)
	}

	log.Printf("Consumer %s stopped", consumerID)
	return nil
}

// StopAllConsumers 停止所有消费者
func (cm *ConsumerManager) StopAllConsumers() error {
	var errs []error

	cm.consumers.Range(func(key, value interface{}) bool {
		consumerID := key.(string)
		if err := cm.StopConsumer(consumerID); err != nil {
			errs = append(errs, fmt.Errorf("failed to stop consumer %s: %v", consumerID, err))
		}
		return true
	})

	if len(errs) > 0 {
		return fmt.Errorf("errors stopping consumers: %v", errs)
	}

	log.Println("All consumers stopped")
	return nil
}

// GetConsumerCount 获取消费者数量
func (cm *ConsumerManager) GetConsumerCount() int {
	count := 0
	cm.consumers.Range(func(_, _ interface{}) bool {
		count++
		return true
	})
	return count
}