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/pkg/constants"
)

// PollingRealnameHandler 负责实名轮询编排，查询结果统一交给卡观测应用服务。
type PollingRealnameHandler struct {
	base        *PollingBase
	gateway     *gateway.Client
	observation *cardapp.Service
	integration *integrationlog.Repository
}

// NewPollingRealnameHandler 创建实名检查任务处理器。
func NewPollingRealnameHandler(base *PollingBase, gw *gateway.Client, observation *cardapp.Service, integration *integrationlog.Repository) *PollingRealnameHandler {
	return &PollingRealnameHandler{base: base, gateway: gw, observation: observation, integration: integration}
}

// Handle 处理实名检查任务。
func (h *PollingRealnameHandler) 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.TaskTypePollingRealname) {
		h.base.logger.Debug("并发已满，重新入队", zap.Uint("card_id", cardID))
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
	}
	defer h.base.releaseConcurrency(ctx, constants.TaskTypePollingRealname)

	// 优先轮询互斥接缝：存在活动优先项时本轮即优先执行或被跳过；无活动项时行为与既有实现一致。
	priority, skip, priorityErr := h.base.beginPollingPriority(ctx, cardID, constants.TaskTypePollingRealname)
	if priorityErr != nil {
		return h.failAndRequeue(ctx, cardID, startedAt, "查询活动优先轮询项失败", priorityErr)
	}
	if skip {
		h.base.logger.Debug("卡轮询优先项已被其它执行持有，本轮跳过并延后",
			zap.Uint("card_id", cardID), zap.String("task_type", constants.TaskTypePollingRealname))
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
	}

	card, err := h.base.getCardWithCache(ctx, cardID)
	if err != nil {
		if isNotFound(err) {
			priority.FailFinal(ctx, "卡不存在")
			return nil
		}
		// 本地读卡失败属可恢复失败：先按真实执行累加尝试次数，再按上限收敛，避免加急事实被静默丢弃。
		priority.MarkExecution(ctx)
		priority.FailRetryable(ctx, "获取卡信息失败")
		return h.failAndRequeue(ctx, cardID, startedAt, "获取卡信息失败", err)
	}
	// 执行前轮询范围校验：优先通道不得重启已停止轮询的卡。
	if !h.base.priorityInPollingScope(ctx, priority, card) {
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
	}
	if card.CardCategory == constants.CardCategoryIndustry || h.gateway == nil {
		priority.FailFinal(ctx, "卡类型不适用实名轮询或实名查询能力未配置")
		return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
	}
	priority.MarkExecution(ctx)
	attempt := newGatewayAttempt(cardID, constants.IntegrationOperationGatewayRealname, constants.CardObservationSceneRealnamePolling)
	result, err := h.gateway.QueryRealnameStatus(ctx, &gateway.CardStatusReq{CardNo: card.ICCID})
	if err != nil {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultFailed, false, "查询实名状态失败")
		priority.FailRetryable(ctx, "查询实名状态失败")
		return h.failAndRequeue(ctx, cardID, startedAt, "查询实名状态失败", err)
	}
	if strings.TrimSpace(result.ICCID) == "" {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultInvalidPayload, false, "实名查询响应缺少 ICCID")
		priority.FailRetryable(ctx, "实名查询响应缺少 ICCID")
		return h.failAndRequeue(ctx, cardID, startedAt, "实名查询响应缺少 ICCID", nil)
	}
	ctx = withPollingWorkerAuditContext(ctx, constants.TaskTypePollingRealname, "实名状态轮询任务", attempt.IntegrationID)
	if h.observation == nil {
		priority.FailFinal(ctx, "卡实名观测能力未配置")
		return h.failAndRequeue(ctx, cardID, startedAt, "卡实名观测能力未配置", nil)
	}
	now := time.Now()
	decision, err := h.observation.ApplyCardObservation(ctx, carddomain.RealnameObservation{
		CardID: cardID, Verified: result.RealStatus,
		Metadata: carddomain.ObservationMetadata{
			ObservationID: attempt.IntegrationID, Source: constants.CardObservationSourcePolling,
			Scene: constants.CardObservationSceneRealnamePolling, ObservedAt: now, CorrelationID: attempt.IntegrationID,
		},
	})
	if err != nil {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultUnknown, false, "应用实名观测失败")
		priority.FailRetryable(ctx, "应用实名观测失败")
		return h.failAndRequeue(ctx, cardID, startedAt, "应用实名观测失败", err)
	}
	changed := decision.StatusChanged
	if changed {
		_ = recordGatewayAttempt(ctx, h.integration, attempt, constants.IntegrationResultSuccess, true, "实名状态发生变化")
	}
	if h.base.verboseLog {
		h.base.logger.Info("实名状态轮询详情", zap.Uint("card_id", cardID), zap.String("iccid", card.ICCID),
			zap.Bool("real_status", result.RealStatus), zap.Int("new_status", decision.AfterStatus),
			zap.Bool("changed", decision.StatusChanged), zap.Bool("reversal_pending", decision.ReversalPending))
	}
	metric := "polling.observation.unchanged"
	if changed {
		metric = "polling.observation.persisted"
	}
	h.base.logger.Info("实名轮询观测完成", zap.Uint("card_id", cardID), zap.Bool("changed", changed), zap.String("metric", metric))
	priority.Complete(ctx)
	h.base.updateStats(ctx, constants.TaskTypePollingRealname, true, time.Since(startedAt))
	return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
}

func (h *PollingRealnameHandler) 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.TaskTypePollingRealname, false, time.Since(startedAt))
	return h.base.requeueCard(ctx, cardID, constants.TaskTypePollingRealname)
}