#pragma once
#include "server/hooks/hook.h"
#include <arpa/inet.h>
#include <cstring>
#include <iostream>
#include <netdb.h>
#include <sstream>
#include <stdexcept>
#include <string>
#include <sys/socket.h>
#include <unistd.h>

// ─────────────────────────────────────────────────────────────────────────────
// DnsUpdaterHook
//
// Fires whenever a server's *name* changes.  Updates Technitium DNS by:
//   1. Logging in  → GET /api/user/login?user=…&pass=… → token
//   2. Deleting the old A record (404 errors are silently ignored)
//   3. Adding    the new A record
//
// The server's IP is derived from the first NIC ip_address that belongs to the
// server record.  This hook receives the old and new Server structs; to look up
// IP addresses it needs access to the Database – pass a const ref in the ctor.
//
// Config is supplied via environment variables so no secrets land in source:
//   TECHNITIUM_HOST  (default: 192.168.2.193)
//   TECHNITIUM_PORT  (default: 5380)
//   TECHNITIUM_USER  (default: admin)
//   TECHNITIUM_PASS  (required – hook logs an error and skips if unset)
//   TECHNITIUM_ZONE  (default: homelab)
//   DNS_TTL          (default: 300)
// ─────────────────────────────────────────────────────────────────────────────

class Database; // forward declaration – full header included in .cpp

class DnsUpdaterHook : public Hook {
public:
    explicit DnsUpdaterHook(const Database& db) : db_(db) {}

    // Trigger only when the server name changes.
    bool filter(const Server& old_server, const Server& new_server) override {
        return old_server.name != new_server.name;
    }

    void execute(const Server& old_server, const Server& new_server) override;

private:
    const Database& db_;

    // Resolve config from environment, falling back to defaults.
    struct Config {
        std::string host;
        int         port;
        std::string user;
        std::string pass;
        std::string zone;
        int         ttl;
    };
    static Config load_config();

    // Percent-encode a string for use in a URL query parameter.
    static std::string url_encode(const std::string& s);

    // Open a TCP connection; throws on failure.
    static int connect_to(const std::string& host, int port);

    // Send an HTTP/1.0 GET request and return the full response body.
    static std::string http_get(const std::string& host, int port,
                                const std::string& path);

    // Send an HTTP/1.0 POST request (application/x-www-form-urlencoded body)
    // and return the full response body.
    static std::string http_post(const std::string& host, int port,
                                 const std::string& path,
                                 const std::string& body);

    // Minimal JSON value extractor – finds "key":"value" or "key":value.
    static std::string json_get(const std::string& json, const std::string& key);
};