package sdk

import (
	"context"
	"crypto/tls"
	"fmt"
	"golib.gaore.com/GaoreGo/gaore-common-sdk-go/sdk/auth"
	"golib.gaore.com/GaoreGo/gaore-common-sdk-go/sdk/auth/credentials"
	"golib.gaore.com/GaoreGo/gaore-common-sdk-go/sdk/requests"
	"golib.gaore.com/GaoreGo/gaore-common-sdk-go/sdk/responses"
	"net"
	"net/http"
	"runtime"
	"strings"
	"time"
)

var Version = "0.0.1"
var defaultConnectTimeout = 5 * time.Second
var defaultReadTimeout = 10 * time.Second
var DefaultUserAgent = fmt.Sprintf("GaoreGoSdk (%s;%s) Golang/%s Core/%s", runtime.GOOS, runtime.GOARCH, strings.Trim(runtime.Version(), "go"), Version)

type Client struct {
	Host           string
	httpClient     *http.Client
	isInsecure     bool
	signer         auth.Signer
	readTimeout    time.Duration
	connectTimeout time.Duration
	config         *Config
}

func (client *Client) GetHTTPSInsecure() bool {
	return client.isInsecure
}

func (client *Client) InitClientConfig() (config *Config) {
	if client.config != nil {
		return client.config
	} else {
		return NewConfig()
	}

}

func (client *Client) InitWithAccessKey(accessKeyId, accessKeySecret, source string) (err error) {
	config := client.InitWithConfig()
	credential := &credentials.BaseCredential{
		AccessKeyId:     accessKeyId,
		AccessKeySecret: accessKeySecret,
	}
	return client.InitWithOptions("", config, credential)
}

func (client *Client) InitWithOptions(host string, config *Config, credential auth.Credential) (err error) {
	client.httpClient = &http.Client{}

	if config.Transport != nil {
		client.httpClient.Transport = config.Transport
	} else if config.HttpTransport != nil {
		client.httpClient.Transport = config.HttpTransport
	}

	if config.Timeout > 0 {
		client.httpClient.Timeout = config.Timeout
	}

	client.signer, err = auth.NewSignerWithCredential(credential, client.ProcessCommonRequestWithSigner)

	return nil
}

func (client *Client) InitWithConfig() (config *Config) {
	if client.config != nil {
		return client.config
	} else {
		return NewConfig()
	}
}

func (client *Client) ProcessCommonRequestWithSigner(request *requests.CommonRequest, signerInterface interface{}) (response *responses.CommonResponse, err error) {
	if signer, isSigner := signerInterface.(auth.Signer); isSigner {
		response = responses.NewCommonResponse()
		err = client.DoActionWithSigner(request, response, signer)
		return
	}
	panic("should not be here")
}

func Timeout(connectTimeout time.Duration) func(ctx context.Context, net, addr string) (c net.Conn, err error) {
	return func(ctx context.Context, network, address string) (c net.Conn, err error) {
		return (&net.Dialer{
			Timeout:   connectTimeout,
			DualStack: true,
		}).DialContext(ctx, network, address)
	}
}

func (client *Client) setTimeOut(request requests.AcsRequest) {
	readTimeout, connectTimeout := client.getTimeOut(request)
	client.httpClient.Timeout = readTimeout
	if trans, ok := client.httpClient.Transport.(*http.Transport); ok && trans != nil {
		trans.DialContext = Timeout(connectTimeout)
		client.httpClient.Transport = trans
	} else if client.httpClient.Transport == nil {
		client.httpClient.Transport = &http.Transport{
			DialContext: Timeout(connectTimeout),
		}
	}
}

func (client *Client) getTimeOut(request requests.AcsRequest) (time.Duration, time.Duration) {
	readTimeOut := defaultReadTimeout
	connectTimeOut := defaultConnectTimeout

	reqReadTimeout := request.GetReadTimeout()
	reqConnectTimeout := request.GetConnectTimeout()
	if reqReadTimeout != 0*time.Millisecond {
		readTimeOut = reqReadTimeout
	} else if client.readTimeout != 0*time.Microsecond {
		readTimeOut = client.readTimeout
	} else if client.httpClient.Timeout != 0 {
		readTimeOut = client.httpClient.Timeout
	}

	if reqConnectTimeout != 0*time.Microsecond {
		connectTimeOut = reqConnectTimeout
	} else if client.connectTimeout != 0*time.Millisecond {
		connectTimeOut = client.connectTimeout
	}
	return readTimeOut, connectTimeOut
}

func (client *Client) getHTTPSInsecure(request requests.AcsRequest) (insecure bool) {
	if request.GetHTTPSInsecure() != nil {
		insecure = *request.GetHTTPSInsecure()
	} else {
		insecure = client.GetHTTPSInsecure()
	}
	return
}

func (client *Client) DoAction(request requests.AcsRequest, response responses.AcsResponse) (err error) {
	return client.DoActionWithSigner(request, response, nil)
}

func (client *Client) DoActionWithSigner(request requests.AcsRequest, response responses.AcsResponse, signer auth.Signer) (err error) {

	client.setTimeOut(request)

	if trans, ok := client.httpClient.Transport.(*http.Transport); ok && trans != nil {
		if trans.TLSClientConfig != nil {
			trans.TLSClientConfig.InsecureSkipVerify = client.getHTTPSInsecure(request)
		} else {
			trans.TLSClientConfig = &tls.Config{
				InsecureSkipVerify: client.getHTTPSInsecure(request),
			}
		}

		client.httpClient.Transport = trans
	}

	var httpResponse *http.Response

}

func (client *Client) buildRequestWithSigner(request requests.AcsRequest, signer auth.Signer) (httpRequest *requests.HttpRequest, err error) {

}