#include "config.hpp"
#include "service_runner.hpp"
#include "server_env.hpp"
#include "templates.hpp"
#include "services.hpp"
#include "utils/directories.hpp"
#include "utils/utils.hpp"
#include <iostream>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <chrono>
#include <iomanip>
#include <filesystem>
#include <unistd.h>

namespace fs = std::filesystem;

namespace dropshell {


service_runner::service_runner(const std::string& server_name, const std::string& service_name) : 
    m_server_env(server_name), m_server_name(server_name), mValid(false)
{
    if (server_name.empty() || service_name.empty())
        return; 

    // Initialize server environment
    if (!m_server_env.is_valid()) 
        return;

    m_service_info = get_service_info(server_name, service_name);
    
    mRemote_service_path = get_remote_service_path(m_server_name, m_service_info.service_name);
    mRemote_service_config_path = get_remote_service_config_path(m_server_name, m_service_info.service_name);
    mRemote_service_template_path = get_remote_service_template_path(m_server_name, m_service_info.service_name);
    mRemote_service_env_file = get_remote_service_env_file(m_server_name, m_service_info.service_name);

    mValid = !m_service_info.local_template_path.empty();
}

bool service_runner::install() {
    maketitle("Installing " + m_service_info.service_name + " (" + m_service_info.template_name + ") on " + m_server_name);

    if (!m_server_env.is_valid()) return false; // should never hit this.
    
    // Check if template exists
    template_info tinfo;
    if (!get_template_info(m_service_info.template_name, tinfo))
        return false;
        
    // Create service directory
    std::string mkdir_cmd = "'mkdir -p " + quote(mRemote_service_path) + "'";
    if (!m_server_env.execute_ssh_command(mkdir_cmd, "Failed to create service directory"))
        return false;
    
    // Check if rsync is installed on remote host
    std::string check_rsync_cmd = "'which rsync > /dev/null 2>&1'";
    if (!m_server_env.execute_ssh_command(check_rsync_cmd, "rsync is not installed on the remote host"))
        return false;

    // Copy template files
    {
        std::cout << "Copying template files from [LOCAL] " << tinfo.local_template_path << std::endl << std::string(24,' ')<<"to [REMOTE] " << mRemote_service_template_path << "/" << std::endl;
        std::string rsync_cmd = "rsync --delete -zrpc -e 'ssh -p " + m_server_env.get_SSH_PORT() + "' " + 
                            quote(tinfo.local_template_path + "/") + " "+ 
                            m_server_env.get_SSH_USER() + "@" + m_server_env.get_SSH_HOST() + ":" + 
                            quote(mRemote_service_template_path+"/");
        //std::cout << std::endl << rsync_cmd << std::endl << std::endl;
        m_server_env.execute_local_command(rsync_cmd,"Failed to copy template files");
    }
    
    // Copy service files (including service.env)
    {
        std::string local_service_path = get_local_service_path(m_server_name, m_service_info.service_name);
        if (local_service_path.empty() || !fs::exists(local_service_path)) {
            std::cerr << "Error: Service directory not found: " << local_service_path << std::endl;
            return false;
        }
        std::cout << "Copying service  files from [LOCAL] " << local_service_path << std::endl <<std::string(24,' ')<<"to [REMOTE] " << mRemote_service_config_path << std::endl; 
        std::string rsync_cmd = "rsync --delete -zrpc -e 'ssh -p " + m_server_env.get_SSH_PORT() + "' " + 
                            quote(local_service_path + "/") + " "+
                            m_server_env.get_SSH_USER() + "@" + m_server_env.get_SSH_HOST() + ":" + 
                            quote(mRemote_service_config_path + "/");
        m_server_env.execute_local_command(rsync_cmd,"Failed to copy service files");
    }

    // Run install script
    {
        std::vector<std::string> args; // not passed through yet.
        m_server_env.run_remote_template_command(m_service_info.service_name, "install", args);
    }

    // print health tick
    std::cout << "Health: " << healthtick() << std::endl;
    return true;
}

bool service_runner::uninstall() {
    maketitle("Uninstalling " + m_service_info.service_name + " (" + m_service_info.template_name + ") on " + m_server_name);
    
    if (!m_server_env.is_valid()) return false; // should never hit this.
    
    // 2. Check if service directory exists on server
    if (!m_server_env.check_remote_dir_exists(mRemote_service_path)) {
        std::cerr << "Service is not installed: " << m_service_info.service_name << std::endl;
        return true; // Nothing to uninstall
    }
    
    // 3. Run uninstall script if it exists
    std::string uninstall_script = mRemote_service_template_path + "/_uninstall.sh";
    bool script_exists = m_server_env.check_remote_file_exists(uninstall_script);
    
    if (script_exists) {
        std::vector<std::string> args; // not passed through yet.
        if (!m_server_env.run_remote_template_command(m_service_info.service_name, "uninstall", args)) {
            std::cerr << "Warning: Uninstall script failed, but continuing with directory removal" << std::endl;
        }

    } else {
        std::cerr << "Warning: No uninstall script found. Unable to uninstall service." << std::endl;
        return false;
    }
    
    // 4. Remove the service directory from the server
    std::string rm_cmd = "'rm -rf " + quote(mRemote_service_path) + "'";
    if (!m_server_env.execute_ssh_command(rm_cmd, "Failed to remove service directory")) {
        return false;
    }
    
    std::cout << "Service " << m_service_info.service_name << " successfully uninstalled from " << m_server_name << std::endl;
    return true;
}


// ------------------------------------------------------------------------------------------------
// Run a command on the service.
// ------------------------------------------------------------------------------------------------
bool service_runner::run_command(const std::string& command) {
    if (!m_server_env.is_valid()) {
        std::cerr << "Error: Server service not initialized" << std::endl;
        return false;
    }
    template_info tinfo;
    if (!get_template_info(m_service_info.template_name, tinfo)) {
        std::cerr << "Error: Template '" << m_service_info.template_name << "' not found" << std::endl;
        return false;
    }

    // don't need a script for edit!
    if (command == "edit") {
        edit_service_config();
        return true;
    }

    if (!template_command_exists(m_service_info.template_name, command)) {
        std::cout << "No command script for " << m_service_info.template_name << " : " << command << std::endl;
        return true; // nothing to run.
    }

    // install doesn't require anything on the server yet.
    if (command == "install") 
        return install();

    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    
    // Check if service directory exists
    if (!m_server_env.check_remote_dir_exists(mRemote_service_path)) {
        return false;
    }
    
    // Check if command script exists
    if (!m_server_env.check_remote_file_exists(script_path)) {
        return false;
    }

    // Check if env file exists
    if (!m_server_env.check_remote_file_exists(mRemote_service_env_file)) {
        return false;
    }

    if (command == "uninstall") 
        return uninstall();
    if (command == "ssh") {
        interactive_ssh_service();
        return true;
    }

    // Run the generic command
    std::vector<std::string> args; // not passed through yet.
    return m_server_env.run_remote_template_command(m_service_info.service_name, command, args);
}


std::map<std::string, ServiceStatus> service_runner::get_all_services_status(std::string server_name)
{
    std::map<std::string, ServiceStatus> status;

    std::string command = "_allservicesstatus";
    std::string service_name = "dropshell-agent";

    if (!template_command_exists(service_name, command))
        {
            std::cerr << "Error: " << service_name << " does not contain the " << command << " script" << std::endl;
            return status;
        }

    std::string remote_service_path = get_remote_service_path(server_name, service_name);
    std::string remote_service_config_path = get_remote_service_config_path(server_name, service_name);
    std::string remote_service_template_path = get_remote_service_template_path(server_name, service_name);
    std::string remote_service_env_file = get_remote_service_env_file(server_name, service_name);

    server_env env(server_name);
    if (!env.is_valid()) {
        std::cerr << "Error: Invalid server environment" << std::endl;
        return status;
    }

    std::string script_path = remote_service_template_path + "/" + command + ".sh";
    std::string ssh_cmd = env.construct_ssh_cmd() + "'cd " + quote(remote_service_template_path) + 
                         " && /bin/bash "+quote(script_path)+" "+quote(remote_service_config_path)+"'";

    std::string output;
    if (!env.execute_local_command_and_capture_output(ssh_cmd, output))
        return status;

    std::stringstream ss(output);
    std::string line;
    while (std::getline(ss, line)) {
        std::string key, value;
        std::size_t pos = line.find("=");
        if (pos != std::string::npos) {
            key = dequote(trim(line.substr(0, pos)));
            value = dequote(trim(line.substr(pos + 1)));

            // decode key, it's of format SERVICENAME_[HEALTH|PORTS]
            std::string service_name = key.substr(0, key.find_last_of("_"));
            std::string status_type = key.substr(key.find_last_of("_") + 1);

            if (status_type == "HEALTH") { // healthy|unhealthy|unknown
                if (value == "healthy")
                    status[service_name].health = HealthStatus::HEALTHY;
                else if (value == "unhealthy")
                    status[service_name].health = HealthStatus::UNHEALTHY;
                else if (value == "unknown")
                    status[service_name].health = HealthStatus::UNKNOWN;
                else
                    status[service_name].health = HealthStatus::ERROR;
            } else if (status_type == "PORTS") { // port1,port2,port3
                std::vector<std::string> ports = string2multi(value);
                for (const auto& port : ports) {
                    if (port!="unknown")
                        status[service_name].ports.push_back(str2int(port));
                }
            }
        }
    }
    return status;
}

HealthStatus service_runner::is_healthy()
{
    if (!m_server_env.is_valid()) {
        std::cerr << "Error: Server service not initialized" << std::endl;
        return HealthStatus::ERROR;
    }

    // Check if status script exists
    std::string command = "status";

    if (!template_command_exists(m_service_info.template_name, command)) {
        return HealthStatus::UNKNOWN;
    }

    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    if (!m_server_env.check_remote_file_exists(script_path)) {
        std::cerr << "Service is not installed: " << m_service_info.service_name << std::endl;
        return HealthStatus::NOTINSTALLED;
    }
    
    // Run status script, does not display output.
    std::vector<std::string> args; // not passed through yet.
    if (!m_server_env.run_remote_template_command(m_service_info.service_name, "status", args))
        return HealthStatus::UNHEALTHY;
    return HealthStatus::HEALTHY;
}

std::string service_runner::healthtick()
{
    std::string green_tick = "\033[32m✓\033[0m";
    std::string red_cross = "\033[31m✗\033[0m";    
    std::string yellow_exclamation = "\033[33m!\033[0m";
    std::string unknown = "\033[33m?\033[0m";

    HealthStatus status = is_healthy();
    if (status == HealthStatus::HEALTHY)
        return green_tick;
    else if (status == HealthStatus::UNHEALTHY)
        return red_cross;
    else if (status == HealthStatus::UNKNOWN)
        return unknown;
    else
        return yellow_exclamation;
}

std::string service_runner::HealthStatus2String(HealthStatus status)
{
    if (status == HealthStatus::HEALTHY)
        return ":tick:";
    else if (status == HealthStatus::UNHEALTHY)
        return ":cross:";
    else if (status == HealthStatus::UNKNOWN)
        return ":question:";
    else if (status == HealthStatus::NOTINSTALLED)
        return ":warning:";
    else
        return ":error:";
}

std::string service_runner::healthmark()
{
    HealthStatus status = is_healthy();
    return HealthStatus2String(status);
}

void interactive_ssh(const std::string & server_name, const std::string & command) {
    std::string serverpath = get_local_server_path(server_name);
    if (serverpath.empty()) {
        std::cerr << "Error: Server not found: " << server_name << std::endl;
        return;
    }

    server_env env(server_name);
    if (!env.is_valid()) {
        std::cerr << "Error: Invalid server environment file: " << server_name << std::endl;
        return;
    }

    std::string ssh_address = env.get_SSH_HOST();
    std::string ssh_user = env.get_SSH_USER();
    std::string ssh_port = env.get_SSH_PORT();

    std::string login = ssh_user + "@" + ssh_address;

    // Execute ssh with server_name and command
    if (command.empty())
        execlp("ssh", "ssh", "-tt", login.c_str(), "-p", ssh_port.c_str(), nullptr);
    else
        execlp("ssh", "ssh", "-tt", login.c_str(), "-p", ssh_port.c_str(), command.c_str(), nullptr);
    
    // If exec returns, it means there was an error
    perror("ssh execution failed");
    exit(EXIT_FAILURE);
}

void edit_server(const std::string &server_name)
{
    std::string serverpath = get_local_server_path(server_name);
    if (serverpath.empty()) {
        std::cerr << "Error: Server not found: " << server_name << std::endl;
        return;
    }

    std::ostringstream aftertext; 
    aftertext << "If you have changed DROPSHELL_DIR, you should manually move the files to the new location NOW.\n"
              << "You can ssh in to the remote server with:  dropshell ssh "<<server_name<<"\n" 
              << "Once moved, reinstall all services with:   dropshell install " << server_name;

    std::string config_file = serverpath + "/server.env";
    edit_file(config_file, aftertext.str());
}

void edit_file(const std::string &file_path, const std::string & aftertext)
{
    std::string cmd = "nano -w "+file_path+" ; echo \""+aftertext+"\"";
    execlp("bash","bash","-c",cmd.c_str(), nullptr);
    
    // If exec returns, it means there was an error
    perror("ssh execution failed");
    exit(EXIT_FAILURE);
}

bool service_runner::restore(std::string backup_file)
{
    std::string command = "restore";
    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    if (!template_command_exists(m_service_info.template_name, command)) {
        std::cout << "No restore script for " << m_service_info.template_name << std::endl;
        return true; // nothing to restore.
    }

    /// TOODOOOOOO!!!!!!
    std::cout << "Restore not implemented yet" << std::endl;
    return true;

    //    std::string run_cmd = construct_standard_command_run_cmd("restore");
    //    return execute_ssh_command(run_cmd, "Restore script failed");
}

void service_runner::interactive_ssh_service()
{
    std::set<std::string> used_commands = get_used_commands(m_server_name, m_service_info.service_name);
    if (used_commands.find("ssh") == used_commands.end()) {
        std::cerr << "Error: "<< m_service_info.service_name <<" does not support ssh" << std::endl;
        return;
    }

    std::vector<std::string> args; // not passed through yet.
    m_server_env.run_remote_template_command(m_service_info.service_name, "ssh", args);
}

void service_runner::edit_service_config()
{
    std::string config_file = get_local_service_env_path(m_server_name, m_service_info.service_name);
    if (!fs::exists(config_file)) {
        std::cerr << "Error: Service config file not found: " << config_file << std::endl;
        return;
    }

    std::string aftertext = "To apply your changes, run:\n   dropshell install " + m_server_name + " " + m_service_info.service_name;

    edit_file(config_file, aftertext);
}

} // namespace dropshell