#include "HotReload.h"
#include "PhysFSManager.h"
#include <iostream>

HotReload::HotReload(const std::string& pathToWatch) : path(pathToWatch), lastWriteTime(0) {
    UpdateLastWriteTime();
}

bool HotReload::CheckForChanges() {
    std::time_t current = GetLatestWriteTimeInPath();
    if (current != lastWriteTime) {
        lastWriteTime = current;
        return true;
    }
    return false;
}

void HotReload::UpdateLastWriteTime() {
    lastWriteTime = GetLatestWriteTimeInPath();
}

std::time_t HotReload::GetFileWriteTime(const std::string& filename) {
    return static_cast<std::time_t>(PhysFSManager::GetModTime(filename));
}

std::time_t HotReload::GetLatestWriteTimeInPath() {
    if (PhysFSManager::Exists(path) && !PhysFSManager::IsDirectory(path)) {
        return GetFileWriteTime(path);
    }

    if (PhysFSManager::IsDirectory(path)) {
        std::time_t newest = 0;
        auto entries = PhysFSManager::ListFiles(path);
        for (const auto& entry : entries) {
            if (entry == "." || entry == "..") continue;
            std::string child = path;
            if (!child.empty() && child.back() != '/') {
                child.push_back('/');
            }
            child += entry;
            if (PhysFSManager::IsDirectory(child)) {
                continue;
            }
            std::time_t t = GetFileWriteTime(child);
            if (t > newest) newest = t;
        }
        return newest;
    }

    return 0;
}