#pragma once

#include <limits.h>
#include <unistd.h>

#include <fstream>
#include <nlohmann/json.hpp>
#include <stdexcept>
#include <string>
#include <vector>

#include "logger.hpp"

using json = nlohmann::json;
using ordered_json = nlohmann::ordered_json;

enum class StreamType
{
    MAIN,
    SUB
};

struct Camera
{
    std::string device;
    std::string name;
    int width = 1280;
    int height = 720;
    int fps = 30;
    int bitrate = 2000000;
    bool enabled = false;
    StreamType stream_type = StreamType::MAIN;
};

struct VehicleMQTTTopics
{
    std::string heartbeat_up;
    std::string video_down;
    std::string record_query;
    std::string record_play;

    void fill_with_veh_id(const std::string& vehId)
    {
        heartbeat_up = "/kun/vehicle/video/status/" + vehId;
        video_down = "/kun/vehicle/video/request/" + vehId;
        record_query = "/kun/vehicle/video/record/query/" + vehId;
        record_play = "/kun/vehicle/video/record/play/" + vehId;
    }
};

struct MQTTConfig
{
    std::string vehicle_id;
    std::string server_ip;
    int server_port = 1883;
    bool need_username_pwd = true;
    std::string client_id;
    std::string username;
    std::string password;
    int keep_alive = 2000;

    int qos = 1;
    bool clean_session = true;

    VehicleMQTTTopics topics;
};

struct SRSConfig
{
    std::string root = "/opt/vehicle-video-service/srs";
    std::string record_config = "/opt/vehicle-video-service/srs/conf/record.conf";
    std::string stream_app = "camera";
    bool live_enabled = true;
    bool record_enabled = true;
    std::string live_host = "127.0.0.1";
    int live_rtmp_port = 1935;
    int live_http_api_port = 1985;
    int live_http_server_port = 8080;
    int live_rtc_port = 8000;
    std::string live_vhost = "live";
    std::string record_host = "127.0.0.1";
    int record_rtmp_port = 2935;
    int record_http_api_port = 2985;
    int record_http_server_port = 2980;
    std::string record_vhost = "record";
    std::string record_path = "/media/record";
    int dvr_duration_sec = 60;
    int retention_days = 14;
    double usage_threshold = 0.90;
    std::string public_interface = "enP2p33s0";
};

struct WebConfig
{
    bool enabled = true;
    std::string bind = "0.0.0.0";
    int port = 18080;
    std::string username = "admin";
    std::string password = "admin123";
};

struct AppConfig
{
    std::vector<Camera> cameras;
    MQTTConfig mqtt;
    SRSConfig srs;
    WebConfig web;

    static AppConfig load_from_file(const std::string& filepath)
    {
        AppConfig cfg;

        std::ifstream ifs(filepath);
        if (!ifs.is_open())
        {
            LOG_ERROR("[Config] Failed to open config file: " + filepath);
            throw std::runtime_error("Failed to open config file: " + filepath);
        }

        json j;
        ifs >> j;

        if (j.contains("cameras"))
        {
            for (auto& c : j["cameras"])
            {
                Camera cam;
                cam.device = c.value("device", "");
                cam.name = c.value("name", "");
                cam.width = c.value("width", cam.width);
                cam.height = c.value("height", cam.height);
                cam.fps = c.value("fps", cam.fps);
                cam.bitrate = c.value("bitrate", cam.bitrate);
                cam.enabled = c.value("enabled", cam.enabled);
                cfg.cameras.push_back(cam);
                LOG_INFO("[Config] Loaded camera: " + cam.name + " (" + cam.device +
                         "), enabled=" + std::to_string(cam.enabled) + ", bitrate=" + std::to_string(cam.bitrate));
            }
        }

        if (!j.contains("mqtt_server"))
        {
            LOG_ERROR("[Config] Missing 'mqtt_server' section");
            throw std::runtime_error("Config file missing 'mqtt_server'");
        }

        auto& m = j["mqtt_server"];
        cfg.mqtt.vehicle_id = std::to_string(m.value("veh_id", 0));
        cfg.mqtt.server_ip = m.value("address", "");
        cfg.mqtt.server_port = m.value("port", cfg.mqtt.server_port);
        cfg.mqtt.need_username_pwd = m.value("need_username_pwd", cfg.mqtt.need_username_pwd);
        cfg.mqtt.client_id = m.value("client_id", "");
        cfg.mqtt.username = m.value("username", "");
        cfg.mqtt.password = m.value("password", "");
        cfg.mqtt.keep_alive = m.value("mqtt_heart_threshold", cfg.mqtt.keep_alive);
        cfg.mqtt.topics.fill_with_veh_id(cfg.mqtt.vehicle_id);

        if (j.contains("srs"))
        {
            auto& s = j["srs"];
            cfg.srs.root = s.value("root", cfg.srs.root);
            cfg.srs.record_config = s.value("record_config", cfg.srs.record_config);
            cfg.srs.stream_app = s.value("stream_app", cfg.srs.stream_app);
            cfg.srs.live_enabled = s.value("live_enabled", cfg.srs.live_enabled);
            cfg.srs.record_enabled = s.value("record_enabled", cfg.srs.record_enabled);
            cfg.srs.live_host = s.value("live_host", cfg.srs.live_host);
            cfg.srs.live_rtmp_port = s.value("live_rtmp_port", cfg.srs.live_rtmp_port);
            cfg.srs.live_http_api_port = s.value("live_http_api_port", cfg.srs.live_http_api_port);
            cfg.srs.live_http_server_port = s.value("live_http_server_port", cfg.srs.live_http_server_port);
            cfg.srs.live_rtc_port = s.value("live_rtc_port", cfg.srs.live_rtc_port);
            cfg.srs.live_vhost = s.value("live_vhost", cfg.srs.live_vhost);
            cfg.srs.record_host = s.value("record_host", cfg.srs.record_host);
            cfg.srs.record_rtmp_port = s.value("record_rtmp_port", cfg.srs.record_rtmp_port);
            cfg.srs.record_http_api_port = s.value("record_http_api_port", cfg.srs.record_http_api_port);
            cfg.srs.record_http_server_port = s.value("record_http_server_port", cfg.srs.record_http_server_port);
            cfg.srs.record_vhost = s.value("record_vhost", cfg.srs.record_vhost);
            cfg.srs.record_path = s.value("record_path", cfg.srs.record_path);
            cfg.srs.dvr_duration_sec = s.value("dvr_duration_sec", cfg.srs.dvr_duration_sec);
            cfg.srs.retention_days = s.value("retention_days", cfg.srs.retention_days);
            cfg.srs.usage_threshold = s.value("usage_threshold", cfg.srs.usage_threshold);
            cfg.srs.public_interface = s.value("public_interface", cfg.srs.public_interface);
        }

        if (j.contains("web"))
        {
            auto& w = j["web"];
            cfg.web.enabled = w.value("enabled", cfg.web.enabled);
            cfg.web.bind = w.value("bind", cfg.web.bind);
            cfg.web.port = w.value("port", cfg.web.port);
            cfg.web.username = w.value("username", cfg.web.username);
            cfg.web.password = w.value("password", cfg.web.password);
        }

        LOG_INFO("[Config] Loaded MQTT server: " + cfg.mqtt.server_ip + ":" + std::to_string(cfg.mqtt.server_port));
        LOG_INFO("[Config] MQTT client ID: " + cfg.mqtt.client_id);
        LOG_INFO("[Config] MQTT Credentials - username: " + cfg.mqtt.username + ", password: " + cfg.mqtt.password);
        LOG_INFO("[Config] MQTT Topics: " + cfg.mqtt.topics.heartbeat_up + ", " + cfg.mqtt.topics.video_down);
        LOG_INFO("[Config] MQTT keepAlive: " + std::to_string(cfg.mqtt.keep_alive));
        LOG_INFO("[Config] SRS root: " + cfg.srs.root);
        LOG_INFO("[Config] SRS record config: " + cfg.srs.record_config);

        return cfg;
    }
};

inline std::string get_executable_dir()
{
    char result[PATH_MAX] = {0};
    ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
    if (count == -1)
    {
        LOG_ERROR("[Config] Failed to read /proc/self/exe");
        throw std::runtime_error("Failed to read /proc/self/exe");
    }

    std::string full_path(result, count);
    auto pos = full_path.find_last_of('/');
    if (pos == std::string::npos)
    {
        LOG_ERROR("[Config] Failed to find executable directory");
        throw std::runtime_error("Failed to find executable directory");
    }

    return full_path.substr(0, pos);
}

inline std::string get_executable_dir_file_path(const std::string& filename)
{
    std::string dir = get_executable_dir();
    if (dir.back() != '/') dir += '/';
    return dir + filename;
}

extern AppConfig g_app_config;