/*
 * Created by PyramIDE.
 * User: フランスのトトロ aka (David RENÉ) 
 * Date: 12/07/2017
 * Time: 01:28
 * © David RENÉ
 */

read cipher/base64.anubis
read tools/basis.anubis
read tools/findstring.anubis
read tools/streams.anubis 
read system/string.anubis
read system/logger.anubis
read system/data_io.anubis
read web/mime.anubis
read calexium_lib/net_services_protocols/logger_service.anubis
read calexium_lib/mail/tools.anubis
read calexium_lib/mail/decode_mail.anubis
read calexium_lib/mail/encode_mail.anubis
read calexium_lib/mail/lexers/fqa.anubis
transmit calexium_lib/mail/types/generated/email_address.anubis
transmit calexium_lib/mail/types/generated/email_to_send.anubis

public type Mail_Structure:
  mail_header_content(String header, String content).

public define Mail_Structure
  no_data_mail =
  mail_header_content("","").
  
//public type Email_Address:
  email_address(String name, String address).
  
 public type File_Attached :
  attached_file(String filename). //, RStream filestream).

//public type Email_to_send :
  data_to_send(
    Email_Address         from, 
    List(Email_Address)   to, 
    List(Email_Address)   cc, 
    List(Email_Address)   bcc, 
    String                subject,
    String                content,
    List(File_Attached)   files,
    Bool                  send_copy,  //send copy to sender by bcc (useful when the email is sent by an automat)
//    String                       from, 
    String                reply_to
  ).

define Bool
  is_element
  (
    String       element,
    List(String) list
  )=
  if list is
  {
    []      then false,
    [h . t] then
      if h = element then 
        true
      else 
        is_element(element, t)
  }.

define Maybe(List($T2)) 
  _do_to_list 
  (
    List($T1)          list,
    $T1 -> Maybe($T2)  to_do,
    List($T2)          new_list
  )=
  if list is
  {
    []      then success(new_list),
    [h . t] then 
      with is_done = to_do(h),
      if is_done is
      {
        failure       then failure,
        success(done) then
          _do_to_list(t, to_do, [done . new_list])
      }
  }.
   
public define Maybe(List($T2)) 
  do_to_list 
  (
    List($T1)          list,
    $T1 -> Maybe($T2)  to_do,
  )= 
  with result = _do_to_list(list, to_do, []),
  if result is
  {
    failure           then failure,
    success(new_list) then success(reverse(new_list))
  }.
   

define Maybe($T)
  last_element
  (
    List($T) list
  )=
  if list is
  {
    []      then failure,
    [h . t] then
      if t is
      {
        []        then   success(h),
        [h1 . t1] then  last_element(t)
      }
  }.
   

public define String
  address_to_string
  (
    Email_Address mail
  )=
  (if mail.name = ""  then "" else to_MIME_text("UTF-8", mail.name) + " ") + 
  "<" + mail.address + ">"
.

define String
  get_mime_of_extensions
  (
    String     ext,
    List(MIME) mime_list
  )=
    if mime_list is
    {
      []      then "application/octet-stream",
      [h . t] then
        if h is mime(_,_, exts) then
          if is_element(ext, exts) then 
            to_String(h)
          else
            get_mime_of_extensions(ext, t)
    }.

define String
  get_mime
  (
    String  filename
  )=
  if last_element(split_by_token(filename, '.')) is
  {
    failure     then "application/octet-stream",
    success(ext)then get_mime_of_extensions("." + ext, known_mime_types)
  }.


define String
  limit_line_length
  (
    String  source,
    Int     limit,
    String  so_far
  ) =
  with l = length(source),
  if l > limit then
    if sub_string(source, 0, limit) is
    {
      failure then so_far, // impossible
      success(s) then 
        if sub_string(source, limit, l - limit) is 
        {
          failure then so_far + s, // impossible
          success(new_source) then
            limit_line_length(new_source, limit, so_far + s + crlf)
        }
    }
  else
    so_far + source.

public define String
  limit_line_length
  (
    String  source,
    Int     limit
  ) =
  limit_line_length(source, limit, "").

public define String
  data_file_multipart
  (
    String     filename, 
    ByteArray  data,
  ) =
  with data_file = limit_line_length(fast_base64_encode(data, false), 76),
  "Content-Type: " + get_mime(filename) + ";" + crlf +
  " name=\"" + filename + "\"" + crlf +
  //"Content-ID :" + crlf +
  "Content-Transfer-Encoding: base64" + crlf +
  "Content-Disposition: attachment;" + crlf +
  " filename=\"" + filename + "\"" + crlf +
  crlf +
  data_file + crlf
  .

define String
  data_file_multipart
  (
    File_ref  file, 
  )=
  with data_file = if read_from_file(file.path +"/"+file.name) is 
                   {  
                     cannot_find_file then constant_byte_array(0,0),
                     read_error(data) then data
                     ok(data)         then data
                   },
  data_file_multipart(file.name, data_file)
.

           if file(fullpath, read) is
          {
            failure then   
              logError(debug_log, "Can't open mail '" + file_name + "'.");failure
            success(f) then success(f)
          }

define String
  data_files_multipart
  (
    List(File_ref)      files,
    String              boundary
  )=
  if files is
  {
    []            then "",
    [file_j . t]  then 
      "--" + boundary + crlf +
      data_file_multipart(file_j) + data_files_multipart(t, boundary)
  }
.


 public define String
  str_utime_send_mail
  (
    UTime t
  ) =
  with date_send  = convert_time(t.seconds),
  if day_name(date_send.week_day) is
  {
    failure then "",
    success(the_day_name) then the_day_name + ", "
  }+
  date_send.day + " " + 
  if month_name(date_send.month) is
  {
    failure then to_decimal(date_send.month),
    success(the_month_name) then the_month_name
  }+ " " +
  date_send.year + " " + 
  zero_pad_n(2, date_send.hour) + ":" + zero_pad_n(2, date_send.minute) + ":" + zero_pad_n(2, date_send.second) 
  //+ " +0000"
  .

 public define String
  get_rfc822_date_format
  =
  str_utime_send_mail(unow).
  
  if capture_shell_command("date", ["-R"]) is 
  {
    failure then str_utime_send_mail(unow),
    success(s) then 
      if split_lines(s) is [h . t] then h else str_utime_send_mail(unow)
  }.

define Int
  _next_ws_pos
  (
    List(Word8) line,
    Int         pos
  ) =
  if line is
  {
    []      then pos,
    [h . t] then 
      if h = 32 | h = 9 then pos
                            else _next_ws_pos(t, pos + 1)
  }.

define String
  encode_plain_text_content
  (
    List(String) lines,
    List(String) output,
  ) =
  if lines is
  {
    []          then join(crlf, reverse(output)),
    [line . t]  then
      with l = length(line), 
           pos = 75 - _next_ws_pos(reverse(explode(force(sub_string(line, 0, 75), line))), 1), 
      if l > 76 then
        if sub_string(line, 0, pos) is
        {
          failure then 
            (if pos < 0 then unique else println("sub_string 1 failure into encode_plain_text_content()"));
            encode_plain_text_content(t, [line . output]),
          success(l1) then
            if sub_string(line, pos + 1, l - pos - 1) is
            {
              failure then 
                println("sub_string 2 failure into encode_plain_text_content()");
                encode_plain_text_content(t, [line . output]),
              success(l2) then
                encode_plain_text_content([l2 . t], [l1 + " " . output])
            }
        }
      else
        encode_plain_text_content(t, [line . output])
  }.
    

public define String
  encode_content
  (
    String content,
    Bool   is_html,
  ) =
  if is_html then
    join(crlf, split_lines(content)) + crlf
  else
    encode_plain_text_content(split_lines(content), []) + crlf.


public define String
  compose_mail
  (
    Email_to_send   send
  ) =
  //with header_to_name = "To: ",
  if send is data_to_send(from, to_list, cc_list, bcc_list, subject, content, files, send_copy, reply_to) then
    with send_date = get_rfc822_date_format,
         text_type  = if find("<html",content,0) is
                      {
                        failure    then "plain",
                        success(_) then "html"
                      },
         data_text = "Content-Type: text/" + text_type + "; charset=UTF-8" + crlf +
                     "Content-Transfer-Encoding: 8bit" + crlf +
                     crlf +
                     encode_content(content, text_type = "html"),
         is_multipart = if files is
                        {
                          []      then false,
                          [h . t] then true
                        },
    
    "Message-ID: " + to_ascii(sha1((from, send_date))) + crlf +
    "Date: " + send_date + crlf +
   // "From: " + user.login + "<" + user.login + "@" + domain + ">" + crlf +
    "User-Agent: Anubis XLib email sender" + crlf +
    "From: " + "<" + from.address + ">" + crlf +
    (if reply_to = "" then 
      ""
    else
      "Reply-To: <" + reply_to +">" + crlf
    )+
    "MIME-Version: 1.0" + crlf +
    //header_to_name + folding(to, 68 - length(header_to_name)) + crlf + 
    "To: " + folding(to_list, address_to_string) + crlf + 
    (
       // with  header_cc_name = "Cc: ",
       // header_cc_name + folding(cc_list, 68 - length(header_cc_name)) + crlf
       if cc_list is [] then ""
                        else "Cc: " + folding(cc_list, address_to_string) + crlf
    ) +
    (if subject = "" then 
      ""
    else
        "Subject: " + to_folded_base64_text("UTF-8", subject) + crlf
    ) +
    if is_multipart then
      with boundary = to_ascii(sha1((from, send_date))),
      "Content-Type: multipart/mixed;" + crlf + 
      " boundary=\"" + boundary + "\"" + crlf + 
      crlf +
      "This is a multi-part message in MIME format." + crlf +  
      "--" + boundary + crlf +
      data_text + crlf + 
      
      data_files_multipart(files, boundary) + 
      
      "--" + boundary + "--"
    else
      data_text
  .


define String
  message_header
  (
    Data_IO        d_io        
  ) =
  if (Maybe(String))read_line(d_io) is
  {
    failure       then  "",
    success(line) then 
      if length(line) = 0 then 
        ""
      else
        line + message_header(d_io)
  }.

public define String
  get_message_header
  (
    String  file_name
  )=
  //open the message file from the drive
  if (Maybe(RStream))file(file_name, read) is
  {
     failure          then println("get_message_header: can't open mail ["+file_name+"] from disk."); "", //logError(debug_log, "get_message_header: can't open mail ["+file_name+"] from disk."); "",
     success(source)  then message_header(make_data_io(source))
  }.


public define String
  get_message_header
  (
    List(Data_IO)  mail_parts
  )=
  //open the message file from the drive
  if rewind(mail_parts) then
    "get_message_header NOT YET Implemented. Please report that error to Calexium"
  else
    "".
  
 public define Mail_Structure
  separate_data_mail
  (
    String mail
  )=
   if find(crlfcrlf, mail, 0) is
   { 
     failure then mail_header_content("", mail),
     success(position) then  mail_header_content(
       if sub_string(mmake_directoriesail, 0, position) is
       {
         failure then "",
         success(substring) then substring
       },
       if sub_string(mail, position + 4 , length(mail) - (position + 4)) is
       {
         failure then mail,
         success(substring) then substring
       }
      )
      
   }.


public define List(String)
  list_of_mails
  (
    String       string_list,
    List(String) mails_list
  )=
    if find(",", string_list, 0) is
    {
      failure then [string_list . mails_list],
      success(separator) then 
        if sub_string(string_list, 0, separator) is
        {
          failure then [],
          success(mail) then 
            if sub_string(string_list, separator + 1, length(string_list) - (separator + 1)) is
            {
              failure then [],
              success(rest) then list_of_mails(rest, [mail . mails_list])
            }
        }
    }
  .

public define Maybe(Email_Address)
  parse_address
  ( 
    String mail,
  )=
   if find("<", mail, 0) is
   {
     failure then
       with result_mail = trim(mail),
       if test_fqa(result_mail) then
         success(email_address("", result_mail))
       else 
         failure,
     success(separator_b) then
       if find(">", mail, separator_b + 1) is
       {
         failure then 
           failure,
         success(separator_e) then
           with name_string = sub_string(mail, 0, separator_b),
                address_string = sub_string(mail, separator_b + 1, separator_e - separator_b - 1),
           if address_string is 
           {
             failure then failure,
             success(add_str) then 
               with name = if name_string is 
                           {
                              failure then "",
                              success(name_str) then trim(name_str)
                           },
               if test_fqa(add_str) then
                 success(email_address(name, add_str))
               else
                 failure
           }
        }
    }.