package task

import (
	"context"
	"strings"
	"time"

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

	cardapp "github.com/break/junhong_cmp_fiber/internal/application/cardobservation"
	carddomain "github.com/break/junhong_cmp_fiber/internal/domain/cardobservation"
	"github.com/break/junhong_cmp_fiber/internal/gateway"
	"github.com/break/junhong_cmp_fiber/internal/infrastructure/integrationlog"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
)

// PollingCardStatusHandler 负责网络状态轮询编排，查询结果统一交给卡观测应用服务。
type PollingCardStatusHandler struct {
	base        *PollingBase
	gateway     *gateway.Client
	observation *cardapp.Service
	integration *integrationlog.Repository
}

// shouldStopPollingForRisk 保留旧测试与调用方的纯判断兼容入口，规则权威在卡观测领域层。
func shouldStopPollingForRisk(card *model.IotCard, extend string) bool {
	if card == nil {
		return false
	}
	return carddomain.ShouldStopPollingForRisk(card.IsStandalone, strings.TrimSpace(extend))
}

// NewPollingCardStatusHandler 创建卡状态轮询任务处理器。
func NewPollingCardStatusHandler(base *PollingBase, gw *gateway.Client, observation *cardapp.Service, integration *integrationlog.Repository) *PollingCardStatusHandler {
	return &PollingCardStatusHandler{base: base, gateway: gw, observation: observation, integration: integration}
}

// Handle 处理卡状态轮询任务。
func (h *PollingCardStatusHandler) Handle(ctx context.Context, task *asynq.Task) error {
	startedAt := time.Now()
	cardID, ok := parseTaskPayload(task.Payload(), h.base.logger)
	if !ok {
		return nil
	}
	if !h.base.acquireConcurrency(ctx, constants.TaskTypePollingCardStatus) {
		h.base.logger.Debug("并发已满，重新入队", zap.Uint("card_id", cardID))
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingCardStatus)
	}
	defer h.base.releaseConcurrency(ctx, constants.TaskTypePollingCardStatus)
	card, err := h.base.getCardWithCache(ctx, cardID)
	if err != nil {
		if isNotFound(err) {
			return nil
		}
		return h.failAndRequeue(ctx, cardID, startedAt, "获取卡信息失败", err)
	}
	if h.gateway == nil {
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingCardStatus)
	}
	attempt := newGatewayAttempt(cardID, constants.IntegrationOperationGatewayNetwork, constants.CardObservationSceneNetworkPolling)
	result, err := h.gateway.QueryCardStatus(ctx, &gateway.CardStatusReq{CardNo: card.ICCID})
	if err != nil {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultFailed, false, "查询卡状态失败")
		return h.failAndRequeue(ctx, cardID, startedAt, "查询卡状态失败", err)
	}
	if strings.TrimSpace(result.ICCID) == "" {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultInvalidPayload, false, "卡状态查询响应缺少 ICCID")
		return h.failAndRequeue(ctx, cardID, startedAt, "卡状态查询响应缺少 ICCID", nil)
	}
	ctx = withPollingWorkerAuditContext(ctx, constants.TaskTypePollingCardStatus, "卡网络状态轮询任务", attempt.IntegrationID)
	if h.observation == nil {
		return h.failAndRequeue(ctx, cardID, startedAt, "卡网络观测能力未配置", nil)
	}
	now := time.Now()
	decision, err := h.observation.ApplyNetworkObservation(ctx, carddomain.NetworkObservation{
		CardID: cardID, GatewayStatus: result.CardStatus, GatewayExtend: result.Extend, GatewayIMEI: result.IMEI,
		Metadata: carddomain.ObservationMetadata{
			ObservationID: attempt.IntegrationID, Source: constants.CardObservationSourcePolling,
			Scene: constants.CardObservationSceneNetworkPolling, ObservedAt: now, CorrelationID: attempt.IntegrationID,
		},
	})
	if err != nil {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultUnknown, false, "应用网络状态观测失败")
		return h.failAndRequeue(ctx, cardID, startedAt, "应用网络状态观测失败", err)
	}
	changed := decision.StatusChanged || decision.StopReasonChanged || decision.StopPolling
	if changed {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultSuccess, true, "网络状态发生变化")
	}
	if h.base.verboseLog || !decision.StatusKnown {
		h.base.logger.Info("卡状态轮询详情", zap.Uint("card_id", cardID), zap.String("iccid", card.ICCID),
			zap.String("card_status", result.CardStatus), zap.String("extend", strings.TrimSpace(result.Extend)),
			zap.Int("new_network_status", decision.AfterStatus), zap.Bool("status_known", decision.StatusKnown),
			zap.Bool("changed", decision.StatusChanged), zap.Bool("stop_polling", decision.StopPolling))
	}
	metric := "polling.observation.unchanged"
	if changed {
		metric = "polling.observation.persisted"
	}
	h.base.logger.Info("卡状态轮询观测完成", zap.Uint("card_id", cardID), zap.Bool("changed", changed), zap.String("metric", metric))
	h.base.updateStats(ctx, constants.TaskTypePollingCardStatus, true, time.Since(startedAt))
	if decision.StopPolling {
		h.base.logger.Info("独立卡命中风险状态，已关闭轮询", zap.Uint("card_id", cardID), zap.String("gateway_extend", decision.GatewayExtend))
		return nil
	}

	// 卡状态任务仍正常但套餐任务丢失时，仅补入缺失项；不改写已有套餐任务的执行时间。
	h.base.invalidateCardCache(ctx, cardID)
	if err := h.base.ensureMissingTask(ctx, cardID, constants.TaskTypePollingPackage); err != nil {
		h.base.logger.Warn("卡状态轮询补齐套餐任务失败", zap.Uint("card_id", cardID), zap.Error(err))
	}
	return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingCardStatus)
}

func (h *PollingCardStatusHandler) failAndRequeue(ctx context.Context, cardID uint, startedAt time.Time, message string, err error) error {
	fields := []zap.Field{zap.Uint("card_id", cardID)}
	if err != nil {
		fields = append(fields, zap.Error(err))
	}
	h.base.logger.Warn(message, fields...)
	h.base.updateStats(ctx, constants.TaskTypePollingCardStatus, false, time.Since(startedAt))
	return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingCardStatus)
}