#include "error.h"
#include "source.h"
#include <stdio.h>
char* error_tag_human_readable(error_tag err_tag) {
  switch (err_tag) {
    case ERROR_PARSE_ERROR: return "Parse error";
    case ERROR_UNRECOGNISED_TOKEN: return "Unrecognised token";
    case ERROR_UNTERMINATED_STRING_LITERAL: return "Unterminated string literal";
    case ERROR_EXPECTED_RPAREN: return "Expected closing parenthesis";
    case ERROR_EXPECTED_RBRACE: return "Expected closing brace";
    case ERROR_EXPECTED_EXPRESSION: return "Expected expression";
    case ERROR_INVALID_PATTERN: return "Invalid pattern";
    case ERROR_EXPECTED_SEMI: return "Expected semicolon";
    case ERROR_UNKNOWN_VARIABLE: return "Unknown variable";
    case WARNING: return "Warning";
  }
}


void error_default_handler(error_t err) {
  source_print_pos(err.source, err.position);
  fprintf(stderr,": %s\n", error_tag_human_readable(err.tag));
  source_print_line(err.source, err.position, err.highlight_len);
  fprintf(stderr,"\n");
}

static void (*global_handler)(error_t err) = error_default_handler;
void error_set_handler(void (*eh)(error_t err)) {
  global_handler = eh;
}
void error_report(error_t error) {
  global_handler(error);
}