package adapter

import (
	"context"
	"errors"

	"github.com/ThreeDotsLabs/watermill/message"
	"github.com/apache/pulsar-client-go/pulsar"

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

const (
	OperationTopic = "persistent://public/default/operation"
	RecordTopic    = "persistent://public/default/record"
)

// PublisherConfig is the configuration to create a publisher.
type PublisherConfig struct {
	// URL is the Pulsar URL.
	URL string
	// TLSTrustCertsFilePath is the path to the CA certificate file for verifying the server certificate.
	// If empty, TLS verification will be disabled.
	TLSTrustCertsFilePath string
	// TLSCertificateFilePath is the path to the client certificate file for mTLS authentication.
	// If empty, mTLS authentication will be disabled.
	TLSCertificateFilePath string
	// TLSKeyFilePath is the path to the client private key file for mTLS authentication.
	// If empty, mTLS authentication will be disabled.
	TLSKeyFilePath string
	// TLSAllowInsecureConnection allows insecure TLS connections (not recommended for production).
	TLSAllowInsecureConnection bool
}

// Publisher provides the pulsar implementation for watermill publish operations.
type Publisher struct {
	conn   pulsar.Client
	logger logger.Logger
	pubs   map[string]pulsar.Producer
}

// NewPublisher creates a new Publisher.
func NewPublisher(config PublisherConfig, adapter logger.Logger) (*Publisher, error) {
	clientOptions := pulsar.ClientOptions{
		URL: config.URL,
		// Logger: 使用 Pulsar 默认 logger（internal 包引用已移除）
	}

	// Configure TLS/mTLS
	if err := configureTLSForClient(&clientOptions, config, adapter); err != nil {
		return nil, errors.Join(err, errors.New("failed to configure TLS"))
	}

	conn, err := pulsar.NewClient(clientOptions)
	if err != nil {
		return nil, errors.Join(err, errors.New("cannot connect to pulsar"))
	}

	return NewPublisherWithPulsarClient(conn, adapter)
}

// NewPublisherWithPulsarClient creates a new Publisher with the provided pulsar connection.
func NewPublisherWithPulsarClient(conn pulsar.Client, logger logger.Logger) (*Publisher, error) {
	return &Publisher{
		conn:   conn,
		pubs:   make(map[string]pulsar.Producer),
		logger: logger,
	}, nil
}

// Publish publishes message to Pulsar.
//
// Publish will not return until an ack has been received from Pulsar.
// When one of messages delivery fails - function is interrupted.
func (p *Publisher) Publish(topic string, messages ...*message.Message) error {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	producer, found := p.pubs[topic]

	if !found {
		pr, err := p.conn.CreateProducer(pulsar.ProducerOptions{Topic: topic})
		if err != nil {
			return err
		}

		producer = pr
		p.pubs[topic] = producer
	}

	for _, msg := range messages {
		// 跳过 nil 消息
		if msg == nil {
			continue
		}

		p.logger.DebugContext(ctx, "Sending message", "key", msg.UUID, "topic", topic)
		_, err := producer.Send(ctx, &pulsar.ProducerMessage{
			Key:     msg.UUID,
			Payload: msg.Payload,
		})
		if err != nil {
			return err
		}
	}

	return nil
}

// Close closes the publisher and the underlying connection.
func (p *Publisher) Close() error {
	for _, pub := range p.pubs {
		pub.Close()
	}

	p.conn.Close()

	return nil
}