package commissiondelivery

import (
	"context"

	"github.com/hibiken/asynq"
	"go.uber.org/zap"
	"gorm.io/gorm"

	"github.com/break/junhong_cmp_fiber/internal/infrastructure/messaging/outbox"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// RecoverLimit 是单次补偿扫描的退款单上限。
const RecoverLimit = 100

// RefundRecoveryTaskHandler 执行退款佣金回溯后处理的周期性补偿任务。
// 该任务只按稳定业务键重投 Outbox 事件，绝不直接改资金；重复执行由消费端幂等兜底。
type RefundRecoveryTaskHandler struct {
	db         *gorm.DB
	repository *outbox.Repository
	logger     *zap.Logger
}

// NewRefundRecoveryTaskHandler 创建退款佣金回溯补偿任务 Handler。
func NewRefundRecoveryTaskHandler(db *gorm.DB, repository *outbox.Repository, logger *zap.Logger) *RefundRecoveryTaskHandler {
	return &RefundRecoveryTaskHandler{db: db, repository: repository, logger: logger}
}

// Handle 扫描已通过但佣金回溯后处理未闭合的退款单，恢复其唯一后处理请求投递。
func (h *RefundRecoveryTaskHandler) Handle(ctx context.Context, _ *asynq.Task) error {
	if h == nil || h.db == nil || h.repository == nil {
		return errors.New(errors.CodeServiceUnavailable, "退款佣金回溯补偿任务未配置")
	}
	stats := RecoverRefundPostProcessing(ctx, h.db, h.repository, RecoverLimit, h.logger)
	h.logger.Info("退款佣金回溯补偿完成",
		zap.String("task_type", constants.TaskTypeRefundCommissionRecovery),
		zap.Int("已补发", stats.Resent), zap.Int("无需补发", stats.Unchanged), zap.Int("失败", stats.Failed))
	return nil
}