package providers

import (
	"bytes"
	"errors"
	"fmt"
	"log"
	"net/http"
	"net/url"

	"github.com/bitly/google_auth_proxy/api"
)

type LinkedInProvider struct {
	*ProviderData
}

func NewLinkedInProvider(p *ProviderData) *LinkedInProvider {
	p.ProviderName = "LinkedIn"
	if p.LoginUrl.String() == "" {
		p.LoginUrl = &url.URL{Scheme: "https",
			Host: "www.linkedin.com",
			Path: "/uas/oauth2/authorization"}
	}
	if p.RedeemUrl.String() == "" {
		p.RedeemUrl = &url.URL{Scheme: "https",
			Host: "www.linkedin.com",
			Path: "/uas/oauth2/accessToken"}
	}
	if p.ProfileUrl.String() == "" {
		p.ProfileUrl = &url.URL{Scheme: "https",
			Host: "www.linkedin.com",
			Path: "/v1/people/~/email-address"}
	}
	if p.ValidateUrl.String() == "" {
		p.ValidateUrl = p.ProfileUrl
	}
	if p.Scope == "" {
		p.Scope = "r_emailaddress r_basicprofile"
	}
	return &LinkedInProvider{ProviderData: p}
}

func getLinkedInHeader(access_token string) http.Header {
	header := make(http.Header)
	header.Set("Accept", "application/json")
	header.Set("x-li-format", "json")
	header.Set("Authorization", fmt.Sprintf("Bearer %s", access_token))
	return header
}

func (p *LinkedInProvider) GetEmailAddress(body []byte, access_token string) (string, error) {
	if access_token == "" {
		return "", errors.New("missing access token")
	}
	params := url.Values{}
	req, err := http.NewRequest("GET", p.ProfileUrl.String()+"?format=json", bytes.NewBufferString(params.Encode()))
	if err != nil {
		return "", err
	}
	req.Header = getLinkedInHeader(access_token)

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

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

func (p *LinkedInProvider) ValidateToken(access_token string) bool {
	return validateToken(p, access_token, getLinkedInHeader(access_token))
}