package app

import (
	"bytes"
	"encoding/xml"
	"io"
	"log"
	"net/http"
	"strings"
	"text/template"

	"github.com/gin-gonic/gin"
)

const outlookTpl = `
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
  <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
    <Account>
      <AccountType>email</AccountType>
      <Action>settings</Action>

{{- if .IMAPEnabled }}
	  <Protocol>
        <Type>IMAP</Type>
        <Server>{{ .IMAPServer }}</Server>
        <Port>{{ .IMAPPort }}</Port>
        <DomainRequired>on</DomainRequired>
        <SPA>off</SPA>
        <SSL>{{ if .IMAPSSL }}on{{ else }}off{{ end }}</SSL>
        <AuthRequired>on</AuthRequired>
        <LoginName>{{ .Username }}@{{ .Domain }}</LoginName>
      </Protocol>
{{- end }}

{{- if .POP3Enabled }}
      <Protocol>
        <Type>POP3</Type>
        <Server>mail.mdfmultimedia.com</Server>
        <Port>995</Port>
        <DomainRequired>on</DomainRequired>
        <SPA>off</SPA>
        <SSL>{{ if .POP3SSL }}on{{ else }}off{{ end }}</SSL>
        <AuthRequired>on</AuthRequired>
        <LoginName>{{ .Username }}@{{ .Domain }}</LoginName>
      </Protocol>
{{- end }}

{{- if .SMTPEnabled }}
      <Protocol>
        <Type>SMTP</Type>
        <Server>mail.mdfmultimedia.com</Server>
        <Port>465</Port>
        <DomainRequired>on</DomainRequired>
        <SPA>off</SPA>
        <SSL>{{ if .SMTPSSL }}on{{ else }}off{{ end }}</SSL>
        <AuthRequired>on</AuthRequired>
        <LoginName>{{ .Username }}@{{ .Domain }}</LoginName>
      </Protocol>
{{- end }}

    </Account>
  </Response>
</Autodiscover>
`

var outlookTemplate *template.Template

func RenderOutlook(g *gin.Context) {
	var err error
	var body []byte
	var domain Domain
	var ok bool
	var b bytes.Buffer

	body, err = io.ReadAll(g.Request.Body)
	if err != nil {
		g.JSON(404, gin.H{"code": "WRONG_BODY", "message": "malformed request"})
		return
	}

	var e struct {
		Address string `xml:"Request>EMailAddress"`
	}

	err = xml.Unmarshal(body, &e)
	if err != nil {
		g.JSON(404, gin.H{"code": "PAGE_NOT_FOUND", "message": "Page not found"})
		return
	}

	components := strings.Split(e.Address, "@")
	username, reqDomain := components[0], components[1]

	domain, ok = Domains[reqDomain]
	if !ok {
		g.JSON(404, gin.H{"code": "PAGE_NOT_FOUND", "message": "Page not found"})
		return
	}

	domain.Username = username
	err = outlookTemplate.Execute(&b, domain)
	if err != nil {
		log.Fatal(err)
	}

	g.Header("Content-Type", "application/xml; charset=utf-8")
	g.String(http.StatusOK, b.String())
}

// curl -X POST -d @req.xml http://127.0.0.1:8888/autodiscover/autodiscover.xml
// curl --basic -X "POST" -u XXX@YYY -v https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml  -H "Content-Type: text/xml" -d @a.txt

/*
<?xml version="1.0" encoding="utf-8"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/mobilesync/requestschema/2006">
    <Request>
        <EMailAddress>testuser@company.tld</EMailAddress>
        <AcceptableResponseSchema>
            http://schemas.microsoft.com/exchange/autodiscover/mobilesync/responseschema/2006
        </AcceptableResponseSchema>
    </Request>
</Autodiscover>

$ curl -d @request.xml -u testuser@company.tld -H "Content-Type: text/xml" -v https://autodiscover.company.tld/autodiscover/autodiscover.xml

*/

/*

   1 - Lookup di un record A (o CNAME) per contoso.com che punta ad un web server che risponderà con un URL HTTPS https://contoso.com/Autodiscover/Autodiscover.xml.
   2 - Lookup di un record A (o CNAME) per autodiscover.contoso.com che punta ad un web server che risponderà con un URL HTTPS https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml
   3 - Lookup di un record A (o CNAME) per contoso.com che punta ad un web server che risponderà con URL HTTP http://autodiscover.contoso.com/Autodiscover/Autodiscover.xml (se avete un reverse proxy o direttamente su Exchange, dovrete fare la configurazione necessaria per implementare l’http to https redirect)
   4 - Lookup di un record SRV per  autodiscover._tcp.contoso.com (Questo record deve contenere la porta 443 e l’hostname, ad esempio mail.contoso.com, permetendo cosi al client di fare una request in https all’URL https://mail.contoso.com/Autodiscover/Autodiscover.xml)

*/