#include <stdio.h>
#include <errno.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include "make_path.h"
#include "config.h"

void remove_suffix(char *base, const char *suffix) {
	char *ptr = base + strlen(base) - strlen(suffix);
	if (!strcmp(ptr, suffix))
		*ptr = '\0';
}

char *MakePath(const char *src, const char *output_dir) {
	char *dup = strdup(src);
	if (dup == NULL) {
		fprintf(stderr, "builder: strdup failed");
		exit(1);
	}

	remove_suffix(dup, ".c");
	char *new_path = mu_make_path("builder", output_dir, dup);
	if (new_path == NULL) {
		free(dup);
		exit(1);
	}

	free(dup);
	return new_path;
}

void Compile(const char *src, const char *output_dir) {
	char *path = MakePath(src, output_dir);
	printf("[CC] Building %s -> %s\n", src, path);

	pid_t pid;
	if ((pid = fork()) == 0) {
		execlp(CC, CC, CFLAGS, src, "-o", path, NULL);
		kill(getpid(), 9);

		/* If compiler return 1 */
		exit(1);
	}

	int status = 0;
	waitpid(pid, &status, 0);
	if (status)
		exit(1);

	free(path);
}

void ListAndCompile(const char *dir, const char *output_dir) {
	printf("[CHDIR] %s\n", dir);
	if (chdir(dir) < 0) {
		fprintf(stderr, "builder: %s: %s\n", dir, strerror(errno));
		exit(1);
	}

	DIR *dp = opendir(".");

	struct dirent *ep;
	while ((ep = readdir(dp)) != NULL) {
		if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
			continue;

		Compile(ep->d_name, output_dir);
	}

	closedir(dp);
	chdir("..");
}

int main(void) {
	/* for (size_t i = 0; i < sizeof(libs) / sizeof(char *); i++)
		ListAndCompile(objects[i], "../obj"); */

	for (size_t i = 0; i < sizeof(objects) / sizeof(char *); i++)
		ListAndCompile(objects[i], "../bin");

	return 0;
}