package warningnotify

import (
	"context"
	"encoding/json"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	smspb "git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/logic/warningnotify/smspb"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/google/uuid"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

type warningSMSConfig struct {
	Enabled         bool   `json:"enabled"`
	URL             string `json:"url"`
	GRPCAddr        string `json:"grpcAddr"`
	Timeout         string `json:"timeout"`
	RouterID        int64  `json:"routerId"`
	ServiceType     string `json:"serviceType"`
	RegionID        string `json:"regionId"`
	AccessKeyID     string `json:"accessKeyId"`
	AccessKeySecret string `json:"accessKeySecret"`
	SDKAppID        string `json:"sdkAppId"`
	SignName        string `json:"signName"`
	TemplateID      string `json:"templateId"`
	MsgContentTpl   string `json:"msgContentTemplate"`
}

type smsSendConfig struct {
	ServiceType     string `json:"serviceType,omitempty"`
	RegionID        string `json:"regionId,omitempty"`
	AccessKeyID     string `json:"accessKeyId,omitempty"`
	AccessKeySecret string `json:"accessKeySecret,omitempty"`
	SDKAppID        string `json:"sdkAppId,omitempty"`
	SignName        string `json:"signName,omitempty"`
	TemplateID      string `json:"templateId,omitempty"`
}

type smsSendParams struct {
	PhoneNumber string `json:"phoneNumber"`
	MsgContent  string `json:"msgContent"`
}

type smsHTTPResponse struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
}

func sendWarningSMS(ctx context.Context, batch Batch) error {
	cfg, ok := loadWarningSMSConfig(ctx)
	recipients := normalizeSMSRecipients(batch.Recipients)
	if len(recipients) == 0 {
		g.Log().Warningf(
			ctx,
			"WarningNotify SMS skipped, no valid recipients, business:%s, tenantId:%s, deptId:%d, category:%s, stage:%d, count:%d",
			batch.Business,
			batch.TenantID,
			batch.DeptID,
			batch.Category,
			batch.WarnStage,
			len(batch.Items),
		)
		return nil
	}

	if batch.SMSContent == "" {
		applyContent(&batch)
	}
	if !ok || !cfg.Enabled || !smsConfigReady(cfg) {
		g.Log().Infof(
			ctx,
			"WarningNotify SMS payload prepared, send skipped, reason:%s, business:%s, tenantId:%s, deptId:%d, category:%s, stage:%d, recipients:%s, count:%d, content:%s",
			smsConfigSkipReason(ok, cfg),
			batch.Business,
			batch.TenantID,
			batch.DeptID,
			batch.Category,
			batch.WarnStage,
			strings.Join(recipients, ","),
			len(batch.Items),
			batch.SMSContent,
		)
		return nil
	}

	params, err := buildSMSRequest(batch, recipients, cfg)
	if err != nil {
		return err
	}
	if strings.TrimSpace(cfg.GRPCAddr) != "" {
		if err = sendWarningSMSGRPC(ctx, cfg, params); err != nil {
			return err
		}
		g.Log().Infof(
			ctx,
			"WarningNotify SMS sent by grpc, business:%s, tenantId:%s, deptId:%d, category:%s, stage:%d, recipients:%s, count:%d",
			batch.Business,
			batch.TenantID,
			batch.DeptID,
			batch.Category,
			batch.WarnStage,
			strings.Join(recipients, ","),
			len(batch.Items),
		)
		return nil
	}

	if err = sendWarningSMSHTTP(ctx, cfg, params); err != nil {
		return err
	}
	g.Log().Infof(
		ctx,
		"WarningNotify SMS sent by http, business:%s, tenantId:%s, deptId:%d, category:%s, stage:%d, recipients:%s, count:%d",
		batch.Business,
		batch.TenantID,
		batch.DeptID,
		batch.Category,
		batch.WarnStage,
		strings.Join(recipients, ","),
		len(batch.Items),
	)
	return nil
}

func loadWarningSMSConfig(ctx context.Context) (warningSMSConfig, bool) {
	var cfg warningSMSConfig
	loaded := false
	v, err := g.Cfg().Get(ctx, "warning.sms")
	if err == nil && !v.IsNil() {
		_ = v.Scan(&cfg)
		loaded = true
	}
	if applyWarningSMSEnv(&cfg) {
		loaded = true
	}
	cfg.URL = strings.TrimSpace(cfg.URL)
	cfg.GRPCAddr = strings.TrimSpace(cfg.GRPCAddr)
	cfg.ServiceType = strings.TrimSpace(cfg.ServiceType)
	cfg.RegionID = strings.TrimSpace(cfg.RegionID)
	cfg.AccessKeyID = strings.TrimSpace(cfg.AccessKeyID)
	cfg.AccessKeySecret = strings.TrimSpace(cfg.AccessKeySecret)
	cfg.SDKAppID = strings.TrimSpace(cfg.SDKAppID)
	cfg.SignName = strings.TrimSpace(cfg.SignName)
	cfg.TemplateID = strings.TrimSpace(cfg.TemplateID)
	cfg.MsgContentTpl = strings.TrimSpace(cfg.MsgContentTpl)
	return cfg, loaded
}

func smsConfigReady(cfg warningSMSConfig) bool {
	return len(missingSMSConfigFields(cfg)) == 0
}

func smsConfigSkipReason(loaded bool, cfg warningSMSConfig) string {
	if !loaded {
		return "warning.sms config not found"
	}
	if !cfg.Enabled {
		return "warning.sms disabled"
	}
	missing := missingSMSConfigFields(cfg)
	if len(missing) > 0 {
		return "warning.sms gateway config incomplete, missing: " + strings.Join(missing, ",")
	}
	return "unknown"
}

func missingSMSConfigFields(cfg warningSMSConfig) []string {
	missing := make([]string, 0, 1)
	if strings.TrimSpace(cfg.GRPCAddr) == "" && strings.TrimSpace(cfg.URL) == "" {
		missing = append(missing, "grpcAddr/url")
	}
	return missing
}

func applyWarningSMSEnv(cfg *warningSMSConfig) bool {
	if cfg == nil {
		return false
	}
	loaded := false
	if value := strings.TrimSpace(os.Getenv("IOTLCM_WARNING_SMS_ENABLED")); value != "" {
		if enabled, err := strconv.ParseBool(value); err == nil {
			cfg.Enabled = enabled
			loaded = true
		}
	}
	if value := strings.TrimSpace(os.Getenv("IOTLCM_WARNING_SMS_ROUTER_ID")); value != "" {
		if routerID, err := strconv.ParseInt(value, 10, 64); err == nil {
			cfg.RouterID = routerID
			loaded = true
		}
	}
	loaded = applySMSStringEnv(&cfg.URL, "IOTLCM_WARNING_SMS_URL") || loaded
	loaded = applySMSStringEnv(&cfg.GRPCAddr, "IOTLCM_WARNING_SMS_GRPC_ADDR") || loaded
	loaded = applySMSStringEnv(&cfg.Timeout, "IOTLCM_WARNING_SMS_TIMEOUT") || loaded
	loaded = applySMSStringEnv(&cfg.ServiceType, "IOTLCM_WARNING_SMS_SERVICE_TYPE") || loaded
	loaded = applySMSStringEnv(&cfg.RegionID, "IOTLCM_WARNING_SMS_REGION_ID") || loaded
	loaded = applySMSStringEnv(&cfg.AccessKeyID, "IOTLCM_WARNING_SMS_ACCESS_KEY_ID") || loaded
	loaded = applySMSStringEnv(&cfg.AccessKeySecret, "IOTLCM_WARNING_SMS_ACCESS_KEY_SECRET") || loaded
	loaded = applySMSStringEnv(&cfg.SDKAppID, "IOTLCM_WARNING_SMS_SDK_APP_ID") || loaded
	loaded = applySMSStringEnv(&cfg.SignName, "IOTLCM_WARNING_SMS_SIGN_NAME") || loaded
	loaded = applySMSStringEnv(&cfg.TemplateID, "IOTLCM_WARNING_SMS_TEMPLATE_ID") || loaded
	loaded = applySMSStringEnv(&cfg.MsgContentTpl, "IOTLCM_WARNING_SMS_MSG_CONTENT_TEMPLATE") || loaded
	return loaded
}

func applySMSStringEnv(target *string, key string) bool {
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return false
	}
	*target = value
	return true
}

func buildSMSRequest(batch Batch, recipients []string, cfg warningSMSConfig) (smsSendParams, error) {
	content := strings.TrimSpace(batch.SMSContent)
	if strings.TrimSpace(content) == "" {
		return smsSendParams{}, gerror.New("warning SMS content is empty")
	}
	msgContent := renderSMSMsgContent(cfg.MsgContentTpl, content, batch)
	return smsSendParams{
		PhoneNumber: strings.Join(recipients, ","),
		MsgContent:  msgContent,
	}, nil
}

func renderSMSMsgContent(template string, content string, batch Batch) string {
	template = strings.TrimSpace(template)
	if template == "" {
		return content
	}
	contentJSON, _ := json.Marshal(content)
	replacer := strings.NewReplacer(
		"{content}", content,
		"{contentJson}", string(contentJSON),
		"{category}", batch.Category,
		"{stage}", strconv.Itoa(batch.WarnStage),
		"{count}", strconv.Itoa(len(batch.Items)),
		"{firstItem}", firstSMSItemCode(batch),
	)
	return replacer.Replace(template)
}

func firstSMSItemCode(batch Batch) string {
	if len(batch.Items) == 0 {
		return ""
	}
	return strings.TrimSpace(batch.Items[0].ItemCode)
}

func buildSMSProviderConfig(cfg warningSMSConfig) smsSendConfig {
	return smsSendConfig{
		ServiceType:     strings.TrimSpace(cfg.ServiceType),
		RegionID:        strings.TrimSpace(cfg.RegionID),
		AccessKeyID:     strings.TrimSpace(cfg.AccessKeyID),
		AccessKeySecret: strings.TrimSpace(cfg.AccessKeySecret),
		SDKAppID:        strings.TrimSpace(cfg.SDKAppID),
		SignName:        strings.TrimSpace(cfg.SignName),
		TemplateID:      strings.TrimSpace(cfg.TemplateID),
	}
}

func sendWarningSMSGRPC(ctx context.Context, cfg warningSMSConfig, params smsSendParams) error {
	timeout := warningSMSTimeout(cfg)
	callCtx, cancel := context.WithTimeout(ctx, timeout)
	defer cancel()

	conn, err := grpc.DialContext(
		callCtx,
		cfg.GRPCAddr,
		grpc.WithTransportCredentials(insecure.NewCredentials()),
		grpc.WithBlock(),
	)
	if err != nil {
		return gerror.Wrap(err, "connect warning SMS grpc failed")
	}
	defer conn.Close()

	paramsBytes, err := json.Marshal(params)
	if err != nil {
		return err
	}
	configBytes, err := json.Marshal(buildSMSProviderConfig(cfg))
	if err != nil {
		return err
	}

	traceID := "warning-sms-" + uuid.NewString()
	res, err := smspb.NewNoticeClient(conn).Send(callCtx, &smspb.SendReq{
		Head: &smspb.HeadReq{
			RouterId: cfg.RouterID,
			TraceId:  traceID,
		},
		Config: configBytes,
		Params: paramsBytes,
	})
	if err != nil {
		return gerror.Wrap(err, "send warning SMS grpc failed")
	}
	if res == nil || res.GetHead() == nil {
		return gerror.New("send warning SMS grpc failed, empty response")
	}
	if res.GetHead().GetCode() != 0 {
		return gerror.Newf("send warning SMS grpc failed, code:%d, message:%s", res.GetHead().GetCode(), res.GetHead().GetMessage())
	}
	return nil
}

func sendWarningSMSHTTP(ctx context.Context, cfg warningSMSConfig, params smsSendParams) error {
	bodyBytes, err := json.Marshal(g.Map{
		"config": buildSMSProviderConfig(cfg),
		"params": params,
	})
	if err != nil {
		return err
	}

	timeout := warningSMSTimeout(cfg)
	client := g.Client().Timeout(timeout).SetHeader("Content-Type", "application/json")
	resp, err := client.Post(ctx, cfg.URL, string(bodyBytes))
	if err != nil {
		return gerror.Wrap(err, "send warning SMS http failed")
	}
	defer resp.Close()
	if resp.StatusCode != http.StatusOK {
		return gerror.Newf("send warning SMS http failed, status code:%d", resp.StatusCode)
	}

	var result smsHTTPResponse
	if err = json.Unmarshal(resp.ReadAll(), &result); err != nil {
		return gerror.Wrap(err, "parse warning SMS http response failed")
	}
	if result.Code != 0 {
		return gerror.Newf("send warning SMS http failed, code:%d, message:%s", result.Code, result.Message)
	}
	return nil
}

func normalizeSMSRecipients(values []string) []string {
	seen := make(map[string]struct{}, len(values))
	recipients := make([]string, 0, len(values))
	for _, value := range values {
		value = strings.TrimSpace(value)
		if value == "" {
			continue
		}
		if _, exists := seen[value]; exists {
			continue
		}
		seen[value] = struct{}{}
		recipients = append(recipients, value)
	}
	return recipients
}

func warningSMSTimeout(cfg warningSMSConfig) time.Duration {
	if cfg.Timeout != "" {
		if duration, err := time.ParseDuration(cfg.Timeout); err == nil && duration > 0 {
			return duration
		}
	}
	return 5 * time.Second
}