package rabbitmq

import (
	"context"
	"fmt"

	"github.com/gogf/gf/v2/frame/g"
	amqp "github.com/rabbitmq/amqp091-go"
)

// QueueConfig 队列配置
type QueueConfig struct {
	Name       string
	Durable    bool       // 持久化
	AutoDelete bool       // 自动删除
	Exclusive  bool       // 排他
	Args       amqp.Table // 额外参数
}

// ExchangeConfig Exchange 配置
type ExchangeConfig struct {
	Name       string
	Type       string // direct/topic/fanout/x-delayed-message
	Durable    bool
	AutoDelete bool
	Args       amqp.Table
}

// BindingConfig 绑定配置
type BindingConfig struct {
	Queue      string
	Exchange   string
	RoutingKey string
	Args       amqp.Table
}

// DeclareQueue 声明队列
func DeclareQueue(ctx context.Context, cfg *QueueConfig) error {
	ch, err := GetChannel()
	if err != nil {
		return err
	}

	_, err = ch.QueueDeclare(
		cfg.Name,
		cfg.Durable,
		cfg.AutoDelete,
		cfg.Exclusive,
		false, // no-wait
		cfg.Args,
	)

	if err != nil {
		g.Log().Errorf(ctx, "声明队列失败: %s, err=%v", cfg.Name, err)
		return err
	}

	g.Log().Infof(ctx, "队列声明成功: %s", cfg.Name)
	return nil
}

// DeclareExchange 声明 Exchange
func DeclareExchange(ctx context.Context, cfg *ExchangeConfig) error {
	ch, err := GetChannel()
	if err != nil {
		return err
	}

	err = ch.ExchangeDeclare(
		cfg.Name,
		cfg.Type,
		cfg.Durable,
		cfg.AutoDelete,
		false, // internal
		false, // no-wait
		cfg.Args,
	)

	if err != nil {
		g.Log().Errorf(ctx, "声明 Exchange 失败: %s, err=%v", cfg.Name, err)
		return err
	}

	g.Log().Infof(ctx, "Exchange 声明成功: %s (type=%s)", cfg.Name, cfg.Type)
	return nil
}

// BindQueue 绑定队列到 Exchange
func BindQueue(ctx context.Context, cfg *BindingConfig) error {
	ch, err := GetChannel()
	if err != nil {
		return err
	}

	err = ch.QueueBind(
		cfg.Queue,
		cfg.RoutingKey,
		cfg.Exchange,
		false, // no-wait
		cfg.Args,
	)

	if err != nil {
		g.Log().Errorf(ctx, "绑定队列失败: queue=%s, exchange=%s, routingKey=%s, err=%v",
			cfg.Queue, cfg.Exchange, cfg.RoutingKey, err)
		return err
	}

	g.Log().Infof(ctx, "队列绑定成功: queue=%s → exchange=%s (routingKey=%s)",
		cfg.Queue, cfg.Exchange, cfg.RoutingKey)
	return nil
}

// SetupDelayExchange 设置延时 Exchange（需要 rabbitmq_delayed_message_exchange 插件）
func SetupDelayExchange(ctx context.Context, exchangeName string) error {
	return DeclareExchange(ctx, &ExchangeConfig{
		Name:    exchangeName,
		Type:    "x-delayed-message",
		Durable: true,
		Args: amqp.Table{
			"x-delayed-type": "direct",
		},
	})
}

// SetupDeadLetterQueue 设置死信队列
func SetupDeadLetterQueue(ctx context.Context, queueName, exchangeName string) error {
	// 1. 声明死信 Exchange
	err := DeclareExchange(ctx, &ExchangeConfig{
		Name:    exchangeName,
		Type:    "direct",
		Durable: true,
	})
	if err != nil {
		return err
	}

	// 2. 声明死信队列
	err = DeclareQueue(ctx, &QueueConfig{
		Name:    queueName,
		Durable: true,
	})
	if err != nil {
		return err
	}

	// 3. 绑定
	return BindQueue(ctx, &BindingConfig{
		Queue:      queueName,
		Exchange:   exchangeName,
		RoutingKey: queueName,
	})
}

// SetupQueueWithDLX 创建带死信队列的普通队列
func SetupQueueWithDLX(ctx context.Context, queueName, dlxExchange, dlxRoutingKey string) error {
	return DeclareQueue(ctx, &QueueConfig{
		Name:    queueName,
		Durable: true,
		Args: amqp.Table{
			"x-dead-letter-exchange":    dlxExchange,
			"x-dead-letter-routing-key": dlxRoutingKey,
		},
	})
}

// SetupBasicTopology 设置基础拓扑（适用于小红书客服场景）
func SetupBasicTopology(ctx context.Context) error {
	// 1. 声明普通 Exchange
	err := DeclareExchange(ctx, &ExchangeConfig{
		Name:    "ragflow_exchange",
		Type:    "direct",
		Durable: true,
	})
	if err != nil {
		return err
	}

	// 2. 声明延时 Exchange
	err = SetupDelayExchange(ctx, "delay_exchange")
	if err != nil {
		return fmt.Errorf("延时 Exchange 声明失败（可能未安装插件）: %v", err)
	}

	// 3. 声明死信队列
	err = SetupDeadLetterQueue(ctx, "dead_letter_queue", "dlx_exchange")
	if err != nil {
		return err
	}

	// 4. 声明业务队列
	queues := []struct {
		name string
		dlx  bool // 是否需要死信队列
	}{
		{"ragflow_request_queue", true},
		{"follow_up_queue", true},
		{"archive_queue", true},
	}

	for _, q := range queues {
		if q.dlx {
			err = SetupQueueWithDLX(ctx, q.name, "dlx_exchange", "dead_letter_queue")
		} else {
			err = DeclareQueue(ctx, &QueueConfig{
				Name:    q.name,
				Durable: true,
			})
		}
		if err != nil {
			return err
		}
	}

	// 5. 绑定队列
	bindings := []BindingConfig{
		{Queue: "ragflow_request_queue", Exchange: "ragflow_exchange", RoutingKey: "ragflow_request_queue"},
		{Queue: "follow_up_queue", Exchange: "delay_exchange", RoutingKey: "follow_up_queue"},
		{Queue: "archive_queue", Exchange: "delay_exchange", RoutingKey: "archive_queue"},
	}

	for _, b := range bindings {
		err = BindQueue(ctx, &b)
		if err != nil {
			return err
		}
	}

	g.Log().Info(ctx, "RabbitMQ 拓扑结构设置完成")
	return nil
}