#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

// API:
// - code = 0: program successfully terminated.
// - code = 1: panicked, panic message in msg. Caller should free msg.
// - code = 2: interpreter error, error in msg. Caller should free msg.
int zig1_run(char* program, char** msg) { return 0; }

// API: run and:
// code = 3: abnormal error, expect something in stderr.
int zig1_run_file(char* fname, char** msg)
{
    FILE* f = fopen(fname, "r");
    if (f == NULL) {
        perror("fopen");
        return 3;
    }
    fseek(f, 0, SEEK_END);
    long fsize = ftell(f);
    if (fsize == -1) {
        perror("ftell");
        fclose(f);
        return 3;
    }
    fseek(f, 0, SEEK_SET);

    char* program = malloc(fsize + 1);
    if (program == NULL) {
        perror("malloc");
        fclose(f);
        return 3;
    }

    size_t bytes_read = fread(program, 1, fsize, f);
    if (bytes_read < fsize) {
        if (ferror(f)) {
            perror("fread");
        } else {
            fprintf(stderr, "Unexpected end of file\n");
        }
        free(program);
        fclose(f);
        return 3;
    }
    fclose(f);
    program[fsize] = 0;

    int code = zig1_run(program, msg);
    free(program);
    return code;
}