#include "version.hpp"
#include "config.hpp"
#include "service_runner.hpp"
#include "services.hpp"
#include "servers.hpp"
#include "utils/directories.hpp"
#include "templates.hpp"
#include "utils/utils.hpp"
#include "autocomplete.hpp"
#include "utils/hash.hpp"

#include <filesystem>
#include <iostream>
#include <string>
#include <vector>
#include <iomanip>
#include <chrono>
#include <libassert/assert.hpp>

namespace dropshell {

extern const std::string VERSION;
extern const std::string RELEASE_DATE;
extern const std::string AUTHOR;
extern const std::string LICENSE;

bool print_help() {
    std::cout << std::endl;
    maketitle("DropShell version " + VERSION);
    std::cout << std::endl;
    std::cout << "A tool for managing server configurations" << std::endl;
    std::cout << std::endl;
    std::cout << "dropshell ..." << std::endl;
    std::cout << "  help           Show this help message" << std::endl;
    std::cout << "  edit           Edit the configuration of dropshell" << std::endl;

    if (gConfig().is_config_set()) {
    std::cout << "  server NAME    Show details for specific server" << std::endl;
    std::cout << "  templates      List all available templates" << std::endl;
    std::cout << std::endl;
    std::cout << std::endl;
    std::cout << "Service commands: (if no service is specified, all services for the server are affected)" << std::endl;
    std::cout << "  list [SERVER] [SERVICE]      List status/details of all servers/server/service." << std::endl;
    std::cout << "  edit [SERVER] [SERVICE]      Edit the configuration of dropshell/server/service." << std::endl;
    std::cout << std::endl;
    std::cout << "  install SERVER [SERVICE]     Install/reinstall/update service(s). Safe/non-destructive." << std::endl;
    std::cout << "  uninstall SERVER [SERVICE]   Uninstalls the service on the remote server. Leaves data intact." << std::endl;
    std::cout << "  nuke SERVER SERVICE          Nuke the service on the remote server, deleting all remote data." << std::endl;
    std::cout << std::endl;
    std::cout << "  COMMAND SERVER [SERVICE]     Run a command on service(s), e.g." << std::endl;
    std::cout << "                                  backup, restore, start, stop, logs" << std::endl;
    std::cout << std::endl;
    std::cout << "  ssh     SERVER SERVICE       Launch an interactive shell on a server or service" << std::endl;
    std::cout << std::endl;
    std::cout << "Creation commands: (apply to the first local config directory)"<<std::endl;
    std::cout << "  create-template TEMPLATE" << std::endl;
    std::cout << "  create-server   SERVER" << std::endl;
    std::cout << "  create-service  SERVER TEMPLATE SERVICE" << std::endl;
    }
    else {
        std::cout << "  edit           Edit the configuration of dropshell" << std::endl;
        std::cout << std::endl;
        std::cout << "Other commands available once initialised." << std::endl;
    }
    return true;
}


int die(const std::string & msg) {
    std::cerr << msg << std::endl;
    return 1;
}

struct ServerAndServices {
    std::string server_name;
    std::vector<LocalServiceInfo> servicelist;
};

bool getCLIServices(const std::string & arg2, const std::string & arg3, 
    ServerAndServices & server_and_services)
{
    if (arg2.empty()) return false;
    server_and_services.server_name = arg2;

    if (arg3.empty()) {
        server_and_services.servicelist = get_server_services_info(arg2);
    } else {
        server_and_services.servicelist.push_back(get_service_info(arg2, arg3));
    }
    return true;
}

std::string safearg(int argc, char *argv[], int index)
{
    if (index >= argc) return "";
    return argv[index];
}

void printversion() {
    maketitle("DropShell version " + VERSION);
    std::cout << "Release date: " << RELEASE_DATE << std::endl;
    std::cout << "Author:       " << AUTHOR << std::endl;
    std::cout << "License:      " << LICENSE << std::endl;
}

#define HAPPYEXIT(CMD, RUNCMD) {if (safearg(argc,argv,1) == CMD) {RUNCMD; return 0;}}
#define BOOLEXIT(CMD, RUNCMD) {if (safearg(argc,argv,1) == CMD) {return (RUNCMD) ? 0 : 1;}}

int main(int argc, char* argv[]) {
    HAPPYEXIT("hash", hash_demo_raw(safearg(argc,argv,2)))
    HAPPYEXIT("makesafecmd", std::cout<<makesafecmd(safearg(argc,argv,2))<<std::endl)
    HAPPYEXIT("version", printversion())
    BOOLEXIT("test-template", gTemplateManager().test_template(safearg(argc,argv,2)))
    ASSERT(safearg(argc,argv,1) != "assert", "Hello! Here is an assert.");

    try {
        // silently attempt to load the config file and templates.
        gConfig().load_config();
        if (gConfig().is_config_set()) 
            gTemplateManager().load_sources();

        if (argc < 2) 
            return print_help() ? 0 : 1;

        std::string cmd = argv[1];

        if (cmd == "autocomplete") {
            std::vector<std::string> argvec;
            for (int i=0; i<argc; i++) 
                argvec.push_back(argv[i]);
            return autocomplete(argvec) ? 0 : 1;
        }

        if (cmd == "help" || cmd == "-h" || cmd == "--help" || cmd== "h" || cmd=="halp") 
            return print_help() ? 0 : 1;

        if (cmd == "edit" && argc < 3) {
            if (!gConfig().is_config_set())
               gConfig().save_config(false);

            std::string config_file = localfile::dropshell_json();
            if (!service_runner::edit_file(config_file) || !std::filesystem::exists(config_file))
                return die("Error: Failed to edit config file.");

            gConfig().load_config();
            if (!gConfig().is_config_set())
                return die("Error: Failed to load and parse edited config file.");

            gConfig().save_config(true);
            std::cout << "Successfully edited config file at " << config_file << std::endl;
            return 0;
        }

        // ------------------------------------------------------------
        // from here we require the config file to be loaded.
        if (!gConfig().is_config_set()) 
            return die("Please run 'dropshell edit' to set up the dropshell configuration.");

        const std::vector<std::string> & server_definition_paths = gConfig().get_local_server_definition_paths();
        if (server_definition_paths.size()>1) { // only show if there are multiple.
            std::cout << "Server definition paths: ";
            for (auto & dir : server_definition_paths) 
                std::cout << "["<< dir << "] ";
            std::cout << std::endl;
        }
        if (gTemplateManager().is_loaded() && gTemplateManager().get_source_count() > 0)
            gTemplateManager().print_sources();

        if (cmd == "server" || cmd == "servers" || cmd == "list" || cmd == "view") 
            switch (argc)
            {
                case 2:
                    list_servers();
                    return 0;
                case 3:
                    show_server_details(argv[2]);
                    return 0;
                case 4:
                    cmd="logs";
                    break;
                default:
                    return die("dropshell server: too many arguments");
            }

        if (cmd == "templates") {
            gTemplateManager().list_templates();
            return 0;
        }

        if (cmd == "create-template") {
            if (argc < 3) return die("Error: create-template requires a template name");
            return (gTemplateManager().create_template(argv[2])) ? 0 : 1;
        }

        if (cmd == "create-server") {
            if (argc < 3) return die("Error: create-server requires a server name");
            return (create_server(argv[2])) ? 0 : 1;
        }

        if (cmd == "create-service") {
            if (argc < 5) return die("Error: not enough arguments.\ndropshell create-service server template service");
            return (create_service(argv[2], argv[3], argv[4])) ? 0 : 1;
        }

         if (cmd == "ssh" && argc < 4) {
            if (argc < 3) return die("Error: ssh requires a server name and optionally service name");
            service_runner::interactive_ssh(argv[2], "bash");
            return 0;
        }

        if (cmd == "edit" && argc < 4) {
            ASSERT(argc>=3, "Error: logic error!");
            service_runner::edit_server(safearg(argc,argv,2));
            return 0;
        }

        // handle running a command. 
        std::set<std::string> commands;
        get_all_used_commands(commands);
        commands.merge(std::set<std::string>{"ssh","edit","_allservicesstatus","fullnuke"}); // handled by service_runner, but not in template_shell_commands.

        if (commands.count(cmd)) {
            std::set<std::string> safe_commands = {"nuke", "fullnuke"};
            if (safe_commands.count(cmd) && argc < 4) 
                return die("Error: "+cmd+" requires a server name and service name. For safety, can't run on all services.");

            // get all the services to run the command on.
            ServerAndServices server_and_services;
            if (!getCLIServices(safearg(argc, argv, 2), safearg(argc, argv, 3), server_and_services)) 
                return die("Error: "+cmd+" command requires server name and optionally service name");

            // run the command on each service.
            for (const auto& service_info : server_and_services.servicelist) {
                if (!SIvalid(service_info))
                    std::cerr<<"Error: Unable to get service information."<<std::endl;
                else {
                    service_runner runner(server_and_services.server_name, service_info.service_name);
                    if (!runner.isValid()) 
                        return die("Error: Failed to initialize service");
                    
                    std::vector<std::string> additional_args;
                    for (int i=4; i<argc; i++)
                        additional_args.push_back(argv[i]);
                    if (!runner.run_command(cmd, additional_args)) 
                        return die(cmd+" failed on service "+service_info.service_name);
                }
            }

            // success!
            return 0;
        }

        // Unknown command
        std::cerr << "Error: Unknown command '" << cmd << "'" << std::endl;
        std::cerr << "Valid commands: ";
        for (const auto& command : commands) {
            if (!command.empty() && command[0]!='_')
                std::cerr << command << " ";
        }
        std::cerr << std::endl;
        return 1;

    } catch (const std::exception& e) {
        std::cerr << "Error: " << e.what() << std::endl;
        return 1;
    }
} 

} // namespace dropshell

int main(int argc, char* argv[]) {
    return dropshell::main(argc, argv);
}