;telnet routines
; to use:
; 1) include this file 
; 2) include these other files:
;  .include "../inc/common.i"
;  .include "../inc/commonprint.i"
;  .include "../inc/net.i"
; 3) define a routine called 'exit_telnet'

.import telnet_connect
.import telnet_local_echo
.import telnet_line_mode
.import telnet_use_native_charset
.import telnet_port
.import telnet_ip


.code
telnet_main_entry:
;prompt for a hostname, then resolve to an IP address
  
  ldax #remote_host
  jsr print
  nb65call #NB65_INPUT_HOSTNAME
  bcc @host_entered
  ;if no host entered, then bail.
  jmp exit_telnet
@host_entered:
  stax nb65_param_buffer
  jsr print_cr
  ldax #resolving
  jsr print
  ldax nb65_param_buffer
  nb65call #NB65_PRINT_ASCIIZ
  jsr print_cr
  ldax #nb65_param_buffer
  nb65call #NB65_DNS_RESOLVE
  bcc @resolved_ok
  print_failed
  jsr print_cr
  jsr print_errorcode
  jmp telnet_main_entry
@resolved_ok:
  ldx #3
@copy_telnet_ip_loop:
  lda nb65_param_buffer,x
  sta telnet_ip,x
  dex
  bpl @copy_telnet_ip_loop
@get_port:
  ldax #remote_port
  jsr print
  nb65call #NB65_INPUT_PORT_NUMBER
  bcc @port_entered
  ;if no port entered, then assume port 23
  ldax #23
@port_entered:
  stax telnet_port
  jsr print_cr
  
  ldax #char_mode_prompt
  jsr print
@char_mode_input:
  jsr get_key
  cmp #'A'
  beq @ascii_mode
  cmp #'a'
  beq @ascii_mode

  cmp #'P'
  beq @petscii_mode
  cmp #'p'
  beq @petscii_mode
  
  cmp #'l'
  beq @line_mode
  cmp #'L'
  beq @line_mode
  
  jmp @char_mode_input
@ascii_mode:
  lda #0
  sta telnet_use_native_charset
  sta telnet_line_mode
  lda #1
  sta telnet_local_echo
  jmp @after_mode_set
@petscii_mode:
  lda #1
  sta telnet_use_native_charset
  lda #0
  sta telnet_local_echo
  sta telnet_line_mode
  jmp @after_mode_set
@line_mode:
  lda #0
  sta telnet_use_native_charset
  lda #1
  sta telnet_local_echo
  sta telnet_line_mode
  
@after_mode_set:
  
  lda #147  ; 'CLR/HOME'
  jsr print_a
  
  ldax  #connecting_in
  jsr print
  lda  telnet_use_native_charset
  beq @a_mode
  ldax #petscii
  jmp @c_mode
@a_mode:
  lda telnet_line_mode
  bne @l_mode
  ldax #ascii  
  jmp @c_mode
@l_mode:
  ldax #line  
@c_mode:
  jsr print  
  ldax #mode
  jsr print
  jsr telnet_connect
  jmp telnet_main_entry  
  
;constants
connecting_in: .byte "CONNECTING IN ",0
ascii: .byte "ASCII",0
petscii: .byte "PETSCII",0
line: .byte "LINE",0
mode: .byte " MODE",13,0
remote_host: .byte "HOSTNAME (LEAVE BLANK TO QUIT)",13,": ",0
remote_port: .byte "PORT # (LEAVE BLANK FOR DEFAULT)",13,": ",0
char_mode_prompt: .byte "MODE - A=ASCII, P=PETSCII, L=LINE",13,0