#include "CacheManager.h"

#include <filesystem>
#include <fstream>
#include <iostream>
#include <ctime>

CacheManager::CacheManager(const char* cache_path) : CacheManager(std::string(cache_path)) { }
CacheManager::CacheManager(std::string cache_path) {
	this->cache_path = cache_path;
	this->verify_cache();
}

CacheManager::~CacheManager() {
	for (std::fstream* file : this->files) {
		if (file != nullptr) {
			file->close();
			delete file;
			file = nullptr;
		}
	}
}

void CacheManager::verify_cache() {
	if (!std::filesystem::is_directory(this->cache_path)) this->init_cache();
	this->update_cache();
}

void CacheManager::init_cache() {
	std::filesystem::create_directory(this->cache_path);
	this->update_cache();
}

void CacheManager::update_cache() {
	std::fstream& date = *cache_get("date");
	this->age = std::time(nullptr);
	date << this->age;
	date.close();
}

std::fstream* CacheManager::cache_get(std::string filename) { return cache_get(filename.c_str()); }
std::fstream* CacheManager::cache_get(const char* filename) {
	std::filesystem::path fixed_path = prefix_cache_path(filename); // fix duplicate slashes and add prefix
	std::filesystem::create_directories(fixed_path.parent_path()); // make sure folder exists
	if (!std::filesystem::exists(fixed_path))
		std::fstream(fixed_path, std::ios::trunc | std::ios::out).close(); // touch file
	std::fstream* file = new std::fstream(fixed_path.c_str(), std::ios::out | std::ios::in); // open file
	this->files.push_back(file); // add file pointer (for closing all files on exit)
	return file;
}

bool CacheManager::cache_exists(std::string filename) { return cache_exists(filename.c_str()); }
bool CacheManager::cache_exists(const char* filename) {
	return std::filesystem::exists(prefix_cache_path(filename));
}


std::string CacheManager::prefix_cache_path(const char* filename) {
	return this->cache_path + "/" + std::string(filename);
}