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include/SniperEngine.hpp

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+#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);
+};