package mqtt_api

import (
	"time"
)

type Context struct {
	// 主题
	Topic string

	// 数据
	Data []byte

	mqttClient          *MqttClient
	handlers            []Handler
	currentHandlerIndex int
}

func newContext(mqttClient *MqttClient, topic string, data []byte, handlers []Handler) (*Context, error) {
	return &Context{
		Topic:               topic,
		Data:                data,
		mqttClient:          mqttClient,
		handlers:            handlers,
		currentHandlerIndex: 0,
	}, nil
}

func destroyContext(c *Context) {
	if c == nil {
		return
	}

	if c.currentHandlerIndex == len(c.handlers) {
		return
	}

	ticker := time.NewTicker(100 * time.Millisecond)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			if c.currentHandlerIndex == len(c.handlers) {
				break
			}
		}
	}
}

func (c *Context) callHandlers() {
	c.currentHandlerIndex = 0
	for c.currentHandlerIndex < len(c.handlers) {
		c.handlers[c.currentHandlerIndex](c)
		c.currentHandlerIndex++
	}
}

func (c *Context) Response(responseIdentifier string, data []byte) error {
	err := c.mqttClient.response(c.Topic, responseIdentifier, data)
	if err != nil {
		return err
	}

	return nil
}

func (c *Context) Next() {
	c.currentHandlerIndex++
	if c.currentHandlerIndex < len(c.handlers) {
		c.handlers[c.currentHandlerIndex](c)
	}
}