package rabbitmq

import (
	"context"
	"time"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"

	"git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/consts"
	mq "git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/library/rabbitmq"
	"git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/model"
)

// defaultBalanceRechargeMaxRetry 是充值超时消息的默认最大重试次数。
// 支付宝凭据未配置等永久性失败会让 CheckRechargeTimeout 一直返回错误，
// 必须设置上限，否则消息会无限重投并刷屏日志。
const defaultBalanceRechargeMaxRetry = 100

// 包级变量便于测试注入发布行为，与 trafficUsagePublish 保持一致。
var balanceRechargePublish = mq.Publish
var balanceRechargePublishDelayed = mq.PublishDelayed

func (c *Consumers) initBalanceRechargeTimeout(ctx context.Context) error {
	if !mq.Enabled(ctx) {
		g.Log().Info(ctx, "balance recharge timeout consumer skipped, RabbitMQ disabled")
		return nil
	}
	if c.balance == nil {
		return gerror.New("balance recharge handler is not configured")
	}
	retryDelay, err := getBalanceRechargeRetryDelay(ctx)
	if err != nil {
		return err
	}
	maxRetry, err := getBalanceRechargeMaxRetry(ctx)
	if err != nil {
		return err
	}
	c.balanceRechargeRetryDelay = retryDelay
	c.balanceRechargeMaxRetry = maxRetry
	if err := mq.DeclareQueue(ctx, consts.QueueBalanceRechargeDeadLetter); err != nil {
		return gerror.Wrap(err, "declare balance recharge dead-letter queue failed")
	}
	if err := mq.ConsumeJSON[model.BalanceRechargeTimeoutMessage](
		ctx,
		consts.QueueBalanceRechargeTimeout,
		"iotlcm-balance-recharge-timeout",
		c.handleBalanceRechargeTimeout,
	); err != nil {
		return err
	}
	g.Log().Infof(ctx, "balance recharge timeout consumer started, queue:%s, retryDelay:%s, maxRetry:%d", consts.QueueBalanceRechargeTimeout, retryDelay, maxRetry)
	return nil
}

func (c *Consumers) handleBalanceRechargeTimeout(ctx context.Context, message model.BalanceRechargeTimeoutMessage) error {
	if message.OutTradeNo == "" {
		g.Log().Errorf(ctx, "balance recharge timeout message dropped, invalid message:%+v", message)
		return nil
	}
	if c.balance == nil {
		return gerror.New("balance recharge handler is not configured")
	}
	if err := c.balance.CheckRechargeTimeout(ctx, message.OutTradeNo); err != nil {
		message.RetryCount++
		if shouldDeadLetterBalanceRecharge(message.RetryCount, c.balanceRechargeMaxRetry) {
			if publishErr := balanceRechargePublish(ctx, consts.QueueBalanceRechargeDeadLetter, message); publishErr != nil {
				return gerror.Wrap(publishErr, "publish balance recharge dead-letter message failed")
			}
			g.Log().Errorf(ctx, "balance recharge timeout retries exhausted and message sent to dead-letter queue, outTradeNo:%s, retryCount:%d, maxRetry:%d, err:%+v", message.OutTradeNo, message.RetryCount, c.balanceRechargeMaxRetry, err)
			return nil
		}
		if retryErr := balanceRechargePublishDelayed(ctx, consts.QueueBalanceRechargeDelay, consts.QueueBalanceRechargeTimeout, c.balanceRechargeRetryDelay, message); retryErr != nil {
			return gerror.Wrap(retryErr, "republish balance recharge timeout message failed")
		}
		g.Log().Warningf(ctx, "balance recharge timeout query failed and will retry, outTradeNo:%s, retryCount:%d, err:%+v", message.OutTradeNo, message.RetryCount, err)
	}
	return nil
}

// shouldDeadLetterBalanceRecharge 判断本次失败后是否放弃重试。
// retryCount 是自增后的重试次数，因此 maxRetry 表示最多重投多少次。
func shouldDeadLetterBalanceRecharge(retryCount, maxRetry int) bool {
	return retryCount > maxRetry
}

func getBalanceRechargeRetryDelay(ctx context.Context) (time.Duration, error) {
	value := g.Cfg().MustGet(ctx, "rabbitmq.balanceRecharge.retryDelay", "1m").String()
	delay, err := time.ParseDuration(value)
	if err != nil || delay <= 0 {
		return 0, gerror.Newf("balance recharge retry delay is invalid: %q", value)
	}
	return delay, nil
}

func getBalanceRechargeMaxRetry(ctx context.Context) (int, error) {
	maxRetry := g.Cfg().MustGet(ctx, "rabbitmq.balanceRecharge.maxRetry", defaultBalanceRechargeMaxRetry).Int()
	if maxRetry <= 0 {
		return 0, gerror.Newf("balance recharge max retry is invalid: %d", maxRetry)
	}
	return maxRetry, nil
}