/*
* Copyright (C) 2023 Johnny Richard
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lexer.h"
#include "parser.h"

void
generate_gas_x86_64_linux(ast_function_t *func)
{
  if (strcmp(func->name, "main") != 0) {
    fprintf(stderr, "[ERROR]: no main function has been defined!\n");
    exit(EXIT_FAILURE);
  }

  printf(".global _start\n");
  printf(".text\n");
  printf("_start:\n");
  printf("  mov $1, %%al\n");
  printf("  mov $%d, %%ebx\n", func->body.number);
  printf("  int $0x80\n");
}

void
print_usage()
{
  fputs("pipac <filename.pipa>\n", stderr);
}

void
print_tokens(lexer_t *lexer) {
  token_t token;
  for (lexer_next_token(lexer, &token); token.kind != TOKEN_EOF; lexer_next_token(lexer, &token)) {
    printf("%s:%d:%d: [kind=%d, value='%s']\n", lexer->filepath, token.row + 1, token.col + 1, token.kind, token.value);
  }
}

int
main(int argc, char **argv)
{
  if (argc < 2) {
    print_usage();
    return EXIT_FAILURE;
  }

  char *filepath = argv[1];

  lexer_t lexer;
  lexer_init(&lexer, filepath);

  parser_t parser;
  parser_init(&parser, &lexer);
  ast_function_t func = parser_parse_function(&parser);

  generate_gas_x86_64_linux(&func);

  return EXIT_SUCCESS;
}