package sshgen

import (
	"crypto/rand"
	"crypto/rsa"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"testing"
	"time"

	"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
	cfpath "github.com/cloudflare/cloudflared/cmd/cloudflared/path"
	"github.com/coreos/go-oidc/jose"
	"github.com/stretchr/testify/assert"
)

const (
	audTest   = "cf-test-aud"
	nonceTest = "asfd"
)

type signingArguments struct {
	Principals   []string `json:"principals"`
	ClientPubKey string   `json:"public_key"`
	Duration     string   `json:"duration"`
}

func TestCertGenSuccess(t *testing.T) {
	url, _ := url.Parse("https://cf-test-access.com/testpath")
	token := tokenGenerator()

	fullName, err := cfpath.GenerateFilePathFromURL(url, keyName)
	assert.NoError(t, err)

	pubKeyName := fullName + ".pub"
	certKeyName := fullName + "-cert.pub"

	defer func() {
		os.Remove(fullName)
		os.Remove(pubKeyName)
		os.Remove(certKeyName)
	}()

	resp := signingArguments{
		Principals:   []string{"dalton"},
		ClientPubKey: "ecdsa-sha2-nistp256-cert-v01@openssh.com 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",
		Duration:     "3m",
	}
	w := httptest.NewRecorder()
	respJson, err := json.Marshal(resp)
	assert.NoError(t, err)
	w.Write(respJson)
	mockRequest = func(url, contentType string, body io.Reader) (*http.Response, error) {
		assert.Contains(t, "/cdn-cgi/access/cert_sign", url)
		assert.Equal(t, "application/json", contentType)
		buf, err := ioutil.ReadAll(body)
		assert.NoError(t, err)
		assert.NotEmpty(t, buf)
		return w.Result(), nil
	}

	err = GenerateShortLivedCertificate(url, token)
	assert.NoError(t, err)

	exist, err := config.FileExists(fullName)
	assert.NoError(t, err)
	if !exist {
		assert.FailNow(t, fmt.Sprintf("key should exist at: %s", fullName), fullName)
		return
	}

	exist, err = config.FileExists(pubKeyName)
	assert.NoError(t, err)
	if !exist {
		assert.FailNow(t, fmt.Sprintf("key should exist at: %s", pubKeyName), pubKeyName)
		return
	}

	exist, err = config.FileExists(certKeyName)
	assert.NoError(t, err)
	if !exist {
		assert.FailNow(t, fmt.Sprintf("key should exist at: %s", certKeyName), certKeyName)
		return
	}
}

func tokenGenerator() string {
	iat := time.Now().Unix()
	exp := time.Now().Add(time.Minute * 5).Unix()
	claims := jose.Claims{}
	claims.Add("aud", audTest)
	claims.Add("iat", iat)
	claims.Add("nonce", nonceTest)
	claims.Add("exp", exp)

	k, err := rsa.GenerateKey(rand.Reader, 512)
	if err != nil {
		return ""
	}
	signer := jose.NewSignerRSA("asdf", *k)
	token, terr := jose.NewSignedJWT(claims, signer)
	if terr != nil {
		return ""
	}
	return token.Encode()
}
