package main

import (
	"context"
	"encoding/json"
	"errors"
	"sparrow/pkg/productconfig"
	"sparrow/pkg/rpcs"

	"github.com/opentracing/opentracing-go/ext"

	"github.com/opentracing/opentracing-go"

	"net/http"

	"sparrow/pkg/models"
	"sparrow/pkg/server"

	"github.com/go-martini/martini"
	"github.com/martini-contrib/render"
)

const (
	ErrOK                 = 0
	ErrSystemFault        = 10001
	ErrProductNotFound    = 10002
	ErrDeviceNotFound     = 10003
	ErrDeviceNotOnline    = 10004
	ErrWrongRequestFormat = 10005
	ErrWrongProductConfig = 10006
	ErrWrongQueryFormat   = 10007
	ErrAccessDenied       = 10008
	ErrIllegalityAction   = 10009 //非法操作
	ErrWrongSecret        = 10010 //
)

var (
	// ErrBadRequestString 参数不全错误
	errBadRequestString = errors.New("请求参数不全")
	errIllegalityString = errors.New("非法操作")
)

const (
	defaultTimeOut = 3 // seconds
)

func renderError(code int, err error) Common {
	result := Common{}
	result.Code = code
	result.Message = err.Error()
	server.Log.Error(err.Error())
	return result
}

func done(result interface{}) Common {
	return Common{
		Code:    ErrOK,
		Message: "success",
		Result:  result,
	}
}

// GetDeviceInfoByKey get device info with device key
func GetDeviceInfoByKey(params martini.Params, req *http.Request, r render.Render) {
	key := req.URL.Query().Get("device_key")
	server.Log.Printf("ACTION GetDeviceInfoByKey, key:: %v", key)
	device := &models.Device{}
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "GetDeviceInfoByKey")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)
	span.SetTag("device_key", key)
	err := server.RPCCallByName(ctx, rpcs.RegistryServerName, "Registry.ValidateDevice", key, device)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrDeviceNotFound, err))
		return
	}

	result := DeviceInfoResponse{
		Data: DeviceInfoData{
			Identifier:  device.DeviceIdentifier,
			Name:        device.DeviceName,
			Description: device.DeviceDescription,
			Version:     device.DeviceVersion,
		},
	}
	r.JSON(http.StatusOK, result)
	return
}

// GetDeviceInfoByIdentifier get device info with device identifier
func GetDeviceInfoByIdentifier(urlparams martini.Params, r render.Render) {
	identifier := urlparams["identifier"]
	server.Log.Printf("ACTION GetDeviceInfoByIdentifier, identifier:: %v", identifier)
	device := &models.Device{}
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "GetDeviceInfoByIdentifier")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)
	span.SetTag("identifier", identifier)
	err := server.RPCCallByName(ctx, rpcs.RegistryServerName, "Registry.FindDeviceByIdentifier", identifier, device)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrDeviceNotFound, err))
		return
	}

	result := DeviceInfoResponse{
		Data: DeviceInfoData{
			Identifier:  device.DeviceIdentifier,
			Name:        device.DeviceName,
			Description: device.DeviceDescription,
			Version:     device.DeviceVersion,
		},
	}
	r.JSON(http.StatusOK, result)
	return
}

func GetDeviceCurrentStatus(device *models.Device, config *productconfig.ProductConfig,
	urlparams martini.Params, r render.Render) {
	server.Log.Printf("ACTION GetDeviceCurrentStatus, identifier:: %v", device.DeviceIdentifier)

	statusargs := rpcs.ArgsGetStatus{
		Id: device.RecordId,
	}
	statusreply := rpcs.ReplyGetStatus{}
	//opentracing
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "GetDeviceCurrentStatus")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)

	err := server.RPCCallByName(ctx, rpcs.ControllerName, "Controller.GetStatus", statusargs, &statusreply)
	if err != nil {
		server.Log.Errorf("get devie status error: %v", err)
		r.JSON(http.StatusOK, renderError(ErrSystemFault, err))
		return
	}

	status, err := config.StatusToMap(statusreply.Status)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}
	result := DeviceStatusResponse{
		Data: status,
	}

	r.JSON(http.StatusOK, result)
	return
}

// GetDeviceLatestStatus get device latest status
func GetDeviceLatestStatus() {

}

// SetDeviceStatus set device status
func SetDeviceStatus(device *models.Device, config *productconfig.ProductConfig,
	urlparams martini.Params, req *http.Request, r render.Render) {
	server.Log.Printf("ACTION GetDeviceCurrentStatus, identifier:: %v,request: %v", device.DeviceIdentifier, req.Body)

	var args interface{}
	decoder := json.NewDecoder(req.Body)
	err := decoder.Decode(&args)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	m, ok := args.(map[string]interface{})
	if !ok {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	status, err := config.MapToStatus(m)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	statusargs := rpcs.ArgsSetStatus{
		DeviceId: device.RecordId,
		Status:   status,
	}
	statusreply := rpcs.ReplySetStatus{}
	//opentracing
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "SetDeviceStatus")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)

	err = server.RPCCallByName(ctx, rpcs.ControllerName, "Controller.SetStatus", statusargs, &statusreply)
	if err != nil {
		server.Log.Errorf("set devie status error: %v", err)
		r.JSON(http.StatusOK, renderError(ErrSystemFault, err))
		return
	}

	r.JSON(http.StatusOK, Common{})
	return

}

// SendCommandToDevice send command to device
func SendCommandToDevice(device *models.Device, config *productconfig.ProductConfig,
	urlparams martini.Params, req *http.Request, r render.Render) {
	timeout := req.URL.Query().Get("timeout")

	server.Log.Printf("ACTION SendCommandToDevice, identifier:: %v, request: %v, timeout: %v",
		device.DeviceIdentifier, req.Body, timeout)

	var args interface{}
	decoder := json.NewDecoder(req.Body)
	err := decoder.Decode(&args)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	m, ok := args.(map[string]interface{})
	if !ok {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	command, err := config.MapToCommand(m)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	cmdargs := rpcs.ArgsSendCommand{
		DeviceId:  device.RecordId,
		SubDevice: uint16(command.Head.SubDeviceid),
		No:        uint16(command.Head.No),
		WaitTime:  uint32(defaultTimeOut),
		Params:    command.Params,
	}
	cmdreply := rpcs.ReplySendCommand{}

	//opentracing
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "SendCommandToDevice")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)

	err = server.RPCCallByName(ctx, rpcs.ControllerName, "Controller.SendCommand", cmdargs, &cmdreply)
	if err != nil {
		server.Log.Errorf("send devie command error: %v", err)
		r.JSON(http.StatusOK, renderError(ErrSystemFault, err))
		return
	}

	r.JSON(http.StatusOK, Common{})
	return

}

// AddRule 增加设备规则
func AddRule(device *models.Device, req *http.Request, r render.Render) {
	var ruleReq CreateRuleRequest
	decoder := json.NewDecoder(req.Body)
	err := decoder.Decode(&ruleReq)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	rule := &models.Rule{
		DeviceID: device.RecordId,
		RuleType: ruleReq.Type,
		Trigger:  ruleReq.Trigger,
		Target:   ruleReq.Target,
		Action:   ruleReq.Action,
	}
	reply := &rpcs.ReplyEmptyResult{}
	//opentracing
	span, ctx := opentracing.StartSpanFromContext(context.Background(), "AddRule")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)

	err = server.RPCCallByName(ctx, rpcs.RegistryServerName, "Registry.CreateRule", rule, reply)
	if err != nil {
		server.Log.Errorf("create device rule error: %v", err)
		r.JSON(http.StatusOK, renderError(ErrSystemFault, err))
		return
	}

	r.JSON(http.StatusOK, Common{})
	return

}

func AppAuth(req *http.Request, r render.Render) {

	var ruleReq rpcs.ArgsAppAuth
	decoder := json.NewDecoder(req.Body)
	err := decoder.Decode(&ruleReq)
	if err != nil {
		r.JSON(http.StatusOK, renderError(ErrWrongRequestFormat, err))
		return
	}

	span, ctx := opentracing.StartSpanFromContext(context.Background(), "AppAuth")
	defer span.Finish()
	ext.SpanKindRPCClient.Set(span)

	app := &models.Application{}

	err = server.RPCCallByName(ctx, rpcs.RegistryServerName, "Registry.FindApplicationByAppKey", ruleReq, app)
	if err != nil {

		r.JSON(http.StatusOK, renderError(ErrWrongSecret, errors.New("Invalid secret key")))
		return
	}

	if app.SecretKey != ruleReq.Secretkey {
		// device secret is wrong.
		r.JSON(http.StatusOK, renderError(ErrWrongSecret, errors.New("wrong application secret.")))
		return
	}

	result := AppAuthDataResponse{
		AccessToken: TokenMaker(app),
	}

	r.JSON(http.StatusOK, Common{
		Result: result,
	})
	return
}