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#include "parse.h"
#include <stdio.h>

struct node_tag *ast_last_numbered_line;

static struct node_tag *ast_alloc(enum NODE_TYPE node_type) {
  struct node_tag *new_node = malloc(sizeof(struct node_tag));
  if (new_node == NULL) {
    fprintf(stderr, "Memory allocation failed at %s:%d\n", __FILE__, __LINE__);
    exit(EXIT_FAILURE);
  }
  new_node->type = node_type;
  return new_node;
}

struct node_tag *ast_make_string(char *s) {
  struct node_tag *new_node = ast_alloc(NODE_STRING);
  new_node->data.string.str = s;
  return new_node;
}

struct node_tag *ast_make_numbered_line(int line, struct node_tag *stmt) {
  struct node_tag *new_node = ast_alloc(NODE_NUMBERED_LINE);
  new_node->data.line.linum = line;
  new_node->data.line.stmt = stmt;
  ast_last_numbered_line = new_node;
  return new_node;
}

struct node_tag *ast_make_print(struct node_tag *expr) {
  struct node_tag *new_node = ast_alloc(NODE_PRINT);
  new_node->data.print.expr = expr;
  return new_node;
}

struct node_tag *ast_make_if(struct node_tag *pred, struct node_tag *stmt) {
  struct node_tag *new_node = ast_alloc(NODE_IF);
  new_node->data.iff.pred = pred;
  new_node->data.iff.stmt = stmt;
  return new_node;
}

struct node_tag *ast_make_id(char *name) {
  struct node_tag *new_node = ast_alloc(NODE_ID);
  new_node->data.id.name = name;
  return new_node;
}

struct node_tag *ast_make_number_integer(int val) {
  struct node_tag *new_node = ast_alloc(NODE_NUMBER_INTEGER);
  new_node->data.number_integer.val = val;
  return new_node;
}

struct node_tag *read_line(char *line) {
  int yyparse_failed;
  yy_scan_string(line);
  yyparse_failed = yyparse();
  yylex_destroy();
  return yyparse_failed ? NULL : ast_last_numbered_line;
}

int set_initial_buffer() {
  rl_replace_line("custom!", 1);
  rl_redisplay();
  return 0;
}

struct node_tag *read_line_stdin(char *prompt) {
  char *line = NULL;
  struct node_tag *read_node;
  rl_startup_hook = set_initial_buffer;
  line = readline(prompt);
  if (strlen(line) == 0)
    return NULL;
  read_node = read_line(line);
  if (read_node != NULL)
    add_history(line);
  free(line);
  return read_node;
}