package simstatus

import (
	"context"
	"fmt"
	"strings"

	zsetconsumer "git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/consumer/zset"
	"git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/model"
	queue "git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/queue/zset"
	simstatusrepo "git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/repository/simstatus"
)

const (
	telecomRetryableCode     = "S00004"
	telecomStatusTemplate    = "sim_dx_v1"
	chanGatewayInternalError = 9999
	// tokenExpiredCode is the carrier code for an expired/invalid upstream
	// token. The gateway already invalidates and refreshes the token once on
	// this code; when it still reaches the worker, retrying in a later round
	// lets a refreshed token succeed instead of parking the card as a terminal
	// business failure.
	tokenExpiredCode = 12021
)

type StatusClient interface {
	QuerySimCardStatus(context.Context, *model.SimCardStatusInput) ([]model.SimBaseRes[model.SimCardStatusItem], error)
}

type StatusRepository interface {
	ApplyBatch(context.Context, []simstatusrepo.Result) error
}

type Handler struct {
	client         StatusClient
	repo           StatusRepository
	networkRetries int
}

func NewHandler(client StatusClient, repo StatusRepository, networkRetries ...int) (*Handler, error) {
	if client == nil || repo == nil {
		return nil, fmt.Errorf("sim status handler dependencies are incomplete")
	}
	retries := 0
	if len(networkRetries) > 0 && networkRetries[0] > 0 {
		retries = networkRetries[0]
	}
	return &Handler{client: client, repo: repo, networkRetries: retries}, nil
}

func (h *Handler) Query(ctx context.Context, task queue.Task) zsetconsumer.Result {
	result := zsetconsumer.Result{Task: task}
	input := &model.SimCardStatusInput{SimKeys: []*model.SimKey{{
		ChanKey: task.ChanKey,
		ICCID:   task.ICCID,
		IMSI:    task.IMSI,
		MSISDN:  task.MSISDN,
	}}}
	var (
		output []model.SimBaseRes[model.SimCardStatusItem]
		err    error
	)
	for attempt := 0; attempt <= h.networkRetries; attempt++ {
		output, err = h.client.QuerySimCardStatus(ctx, input)
		if err == nil {
			break
		}
		if ctx.Err() != nil {
			break
		}
	}
	if err != nil {
		result.ErrorClass = "network"
		result.Retryable = true
		result.Message = err.Error()
		return result
	}
	if len(output) == 0 {
		result.ErrorClass = "protocol"
		result.Retryable = true
		result.Message = "chan returned empty status result"
		return result
	}
	item := output[0]
	if item.SimKey == nil {
		item.SimKey = &model.SimKey{ChanKey: task.ChanKey, ICCID: task.ICCID, IMSI: task.IMSI, MSISDN: task.MSISDN}
	}
	if task.ICCID != "" && item.SimKey.ICCID != task.ICCID {
		result.ErrorClass = "protocol"
		result.Retryable = true
		result.Message = "chan returned mismatched card identifier"
		return result
	}
	result.Code = item.Code
	result.Message = item.Message
	result.ErrCode = item.ErrCode
	if item.Code != 0 {
		result.ErrorClass = "business"
		if model.IsTelecomTemplate(task.TempKey) && strings.EqualFold(strings.TrimSpace(item.ErrCode), telecomRetryableCode) {
			result.ErrorClass = "carrier_retry"
			result.Retryable = true
		} else if item.Code == chanGatewayInternalError && strings.TrimSpace(item.ErrCode) == "" {
			result.ErrorClass = "gateway"
			result.Retryable = true
		} else if item.Code == tokenExpiredCode {
			result.ErrorClass = "token_expired"
			result.Retryable = true
		}
		return result
	}
	result.Success = true
	status := item.ResData.CardStatus
	result.CardStatus = &status
	return result
}

func (h *Handler) Apply(ctx context.Context, results []zsetconsumer.Result) error {
	updates := make([]simstatusrepo.Result, 0, len(results))
	for _, result := range results {
		if result.Success && result.CardStatus != nil {
			updates = append(updates, simstatusrepo.Result{CardID: result.Task.CardID, CardStatus: *result.CardStatus})
		}
	}
	return h.repo.ApplyBatch(ctx, updates)
}

// ShouldRetryNextRound is the full-status-sync retry policy. It is passed to
// the Run-aware ZSet consumer only; single-card tasks retain lease recovery.
func ShouldRetryNextRound(result zsetconsumer.Result) bool {
	return !result.Success && result.Retryable
}