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// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include "core/launch_timestamp_cache.h"
#include <filesystem>
#include <fstream>
#include <mutex>
#include <sstream>
#include <string>
#include <unordered_map>
#include <fmt/format.h>
#include <nlohmann/json.hpp>
#include "common/fs/fs.h"
#include "common/fs/file.h"
#include "common/fs/path_util.h"
#include "common/logging/log.h"
namespace Core::LaunchTimestampCache {
namespace {
using CacheMap = std::unordered_map<u64, s64>;
using CountMap = std::unordered_map<u64, u64>;
std::mutex g_mutex;
CacheMap g_cache;
CountMap g_counts;
bool g_loaded = false;
std::filesystem::path GetCachePath() {
return Common::FS::GetEdenPath(Common::FS::EdenPath::CacheDir) / "launched.json";
}
std::optional<std::string> ReadFileToString(const std::filesystem::path& path) {
const std::ifstream file{path, std::ios::in | std::ios::binary};
if (!file) {
return std::nullopt;
}
std::ostringstream ss;
ss << file.rdbuf();
return ss.str();
}
bool WriteStringToFile(const std::filesystem::path& path, const std::string& data) {
if (!Common::FS::CreateParentDirs(path)) {
return false;
}
std::ofstream file{path, std::ios::out | std::ios::binary | std::ios::trunc};
if (!file) {
return false;
}
file.write(data.data(), static_cast<std::streamsize>(data.size()));
return static_cast<bool>(file);
}
void Load() {
if (g_loaded) {
return;
}
g_loaded = true;
const auto path = GetCachePath();
if (!std::filesystem::exists(path)) {
return;
}
const auto data = ReadFileToString(path);
if (!data) {
LOG_WARNING(Core, "Failed to read launch timestamp cache: {}",
Common::FS::PathToUTF8String(path));
return;
}
try {
const auto json = nlohmann::json::parse(data->data(), data->data() + data->size());
if (!json.is_object()) {
return;
}
for (auto it = json.begin(); it != json.end(); ++it) {
const auto key_str = it.key();
const auto value = it.value();
u64 key{};
try {
key = std::stoull(key_str, nullptr, 16);
} catch (...) {
continue;
}
if (value.is_object()) {
if (value.contains("timestamp") && value["timestamp"].is_number_integer()) {
g_cache[key] = value["timestamp"].get<s64>();
}
if (value.contains("launch_count") && value["launch_count"].is_number_unsigned()) {
g_counts[key] = value["launch_count"].get<u64>();
}
} else if (value.is_number_integer()) {
// Legacy format: raw timestamp only
g_cache[key] = value.get<s64>();
}
}
} catch (const std::exception& e) {
LOG_WARNING(Core, "Failed to parse launch timestamp cache: {}", e.what());
}
}
void Save() {
nlohmann::json json = nlohmann::json::object();
for (const auto& [key, value] : g_cache) {
nlohmann::json entry = nlohmann::json::object();
entry["timestamp"] = value;
const auto count_it = g_counts.find(key);
entry["launch_count"] = count_it != g_counts.end() ? count_it->second : 0;
json[fmt::format("{:016X}", key)] = entry;
}
const auto path = GetCachePath();
if (!WriteStringToFile(path, json.dump(4))) {
LOG_WARNING(Core, "Failed to write launch timestamp cache: {}",
Common::FS::PathToUTF8String(path));
}
}
s64 NowSeconds() {
return std::time(nullptr);
}
} // namespace
void SaveLaunchTimestamp(u64 title_id) {
std::scoped_lock lk{g_mutex};
Load();
g_cache[title_id] = NowSeconds();
g_counts[title_id] = g_counts[title_id] + 1;
Save();
}
s64 GetLaunchTimestamp(u64 title_id) {
std::scoped_lock lk{g_mutex};
Load();
const auto it = g_cache.find(title_id);
if (it != g_cache.end()) {
return it->second;
}
// we need a timestamp, i decided on 01/01/2026 00:00
return 1767225600;
}
u64 GetLaunchCount(u64 title_id) {
std::scoped_lock lk{g_mutex};
Load();
const auto it = g_counts.find(title_id);
if (it != g_counts.end()) {
return it->second;
}
return 0;
}
} // namespace Core::LaunchTimestampCache
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