#pragma once
#include <thread>
#include <atomic>
#include <mutex>
#include <vector>
#include <string>
#include <optional>
#include "Config.hpp"
#include "State.hpp"
#include "Scraper.hpp"
#include "DiscordNotifier.hpp"

// Owns the background watch loop (equivalent to python's `bot_loop`) plus
// all the mutating operations the Flask `/api/*` routes used to expose.
// The Discord bot's slash-command handlers call straight into this class.
class SniperEngine {
public:
    SniperEngine(AppConfig& config, SniperState& state, DiscordNotifier& notifier);
    ~SniperEngine();

    bool start(std::string* error_out = nullptr);
    void stop();
    bool isRunning() const;

    // Fire-and-forget manual rescan of a single URL (spawns a detached thread,
    // matching python's api_scan_now()).
    void scanNow(const std::string& url);

    bool addLink(LinkConfig link);
    bool removeLink(const std::string& url);
    bool togglePause(const std::string& url, bool* now_paused_out = nullptr);

    std::vector<LinkConfig> links();
    int intervalSeconds() const;
    void setIntervalSeconds(int seconds);

private:
    AppConfig& config_;
    SniperState& state_;
    DiscordNotifier& notifier_;
    Scraper scraper_;

    std::mutex links_mtx_;
    std::thread worker_;
    std::atomic<bool> stop_requested_{false};

    void loop();
    void runOneScan(const LinkConfig& cfg, bool isManual);
    static std::string getChangeText(size_t n, const std::optional<std::vector<std::string>>& old);
};