package providers

import (
	"errors"
	"fmt"
	"github.com/bitly/go-simplejson"
	"github.com/bitly/oauth2_proxy/api"
	"log"
	"net/http"
	"net/url"
	"strings"
)

type AzureProvider struct {
	*ProviderData
	Tenant string
}

func NewAzureProvider(p *ProviderData) *AzureProvider {
	p.ProviderName = "Azure"

	if p.ProfileURL == nil || p.ProfileURL.String() == "" {
		p.ProfileURL = &url.URL{
			Scheme: "https",
			Host:   "graph.microsoft.com",
			Path:   "/v1.0/me",
		}
	}
	if p.ProtectedResource == nil || p.ProtectedResource.String() == "" {
		p.ProtectedResource = &url.URL{
			Scheme: "https",
			Host:   "graph.microsoft.com",
		}
	}
	if p.Scope == "" {
		p.Scope = "openid"
	}

	if p.ApprovalPrompt == "" || p.ApprovalPrompt == "force" {
		p.ApprovalPrompt = "consent"
	}

	return &AzureProvider{ProviderData: p}
}

func (p *AzureProvider) Configure(tenant string) {
	p.Tenant = tenant
	if tenant == "" {
		p.Tenant = "common"
	}

	if p.LoginURL == nil || p.LoginURL.String() == "" {
		p.LoginURL = &url.URL{
			Scheme: "https",
			Host:   "login.microsoftonline.com",
			Path:   "/" + p.Tenant + "/oauth2/authorize"}
	}
	if p.RedeemURL == nil || p.RedeemURL.String() == "" {
		p.RedeemURL = &url.URL{
			Scheme: "https",
			Host:   "login.microsoftonline.com",
			Path:   "/" + p.Tenant + "/oauth2/token",
		}
	}
}

func getAzureHeader(access_token string) http.Header {
	header := make(http.Header)
	header.Set("Authorization", fmt.Sprintf("Bearer %s", access_token))
	return header
}

func getEmailFromJSON(json *simplejson.Json) (string, error) {
	var email string
	var err error

	email, err = json.Get("mail").String()

	if err != nil || email == "" {
		otherMails, otherMailsErr := json.Get("otherMails").Array()
		if len(otherMails) > 0 {
			email = otherMails[0].(string)
		}
		err = otherMailsErr
	}

	return email, err
}

func (p *AzureProvider) GetEmailAddress(s *SessionState) (string, error) {
	var email string
	var err error

	if s.AccessToken == "" {
		return "", errors.New("missing access token")
	}
	req, err := http.NewRequest("GET", p.ProfileURL.String(), nil)
	if err != nil {
		return "", err
	}
	req.Header = getAzureHeader(s.AccessToken)

	json, err := api.Request(req)

	if err != nil {
		return "", err
	}

	email, err = getEmailFromJSON(json)

	if err == nil && email != "" {
		return email, err
	}

	email, err = json.Get("userPrincipalName").String()

	if err != nil {
		log.Printf("failed making request %s", err)
		return "", err
	}

	if email == "" {
		log.Printf("failed to get email address")
		return "", err
	}

	return email, err
}

func (p *AzureProvider) GetGroups(s *SessionState) (string, error) {
	if s.AccessToken == "" {
		return "", errors.New("missing access token")
	}

	if s.IDToken == "" {
		return "", errors.New("missing id token")
	}

	// parse token, check if it has groups
	// if groups, return "|".join(groups_list)
	// else
	//   look for claim source
	//   GET source
	//   parse response
	//   return "|".join(response.groups_list)

	req, err := http.NewRequest("GET", "https://graph.microsoft.com/v1.0/me/memberOf/", nil)
	//req, err := http.NewRequest("POST", "https://graph.microsoft.com/v1.0/me/getMemberGroups", strings.NewReader("{\"securityEnabledOnly\":true}"))
	if err != nil {
		return "", err
	}
	req.Header = getAzureHeader(s.AccessToken)
	req.Header.Add("Content-Type", "application/json")

	groupData, err := api.Request(req)

	groups := make([]string, 0)
	for _, groupInfo := range groupData.Get("value").MustArray() {
		//v, ok := groupInfo.(string)
		v, ok := groupInfo.(map[string]interface{})
		if !ok {
			continue
		}
		dname := v["displayName"].(string)
		secen := v["securityEnabled"].(bool)
		mailen := v["mailEnabled"].(bool)
		if secen == true && mailen == false {
			groups = append(groups, dname)
		}
	}

	return strings.Join(groups, "|"), nil
}

func (p *AzureProvider) GetLoginURL(redirectURI, finalRedirect string) string {
	var a url.URL
	a = *p.LoginURL
	params, _ := url.ParseQuery(a.RawQuery)
	params.Set("client_id", p.ClientID)
	params.Set("response_type", "id_token code")
	params.Set("redirect_uri", redirectURI)
	params.Set("response_mode", "form_post")
	params.Add("scope", p.Scope)
	params.Set("prompt", p.ApprovalPrompt)
	params.Set("nonce", "FIXME")
	if strings.HasPrefix(finalRedirect, "/") {
		params.Add("state", finalRedirect)
	}
	a.RawQuery = params.Encode()
	return a.String()
}