#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 "command_registry.hpp"

#include <filesystem>
#include <iostream>
#include <string>
#include <vector>
#include <iomanip>
#include <chrono>
#include <assert.hpp>
#include <sstream>
#include <algorithm>
namespace dropshell {

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


int main(int argc, char* argv[]) {

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


        // process the command line arguments.
        std::vector<std::string> args(argv, argv + argc);

        if (args.size() < 2) 
            args.push_back("help");
        ASSERT(args.size() > 1, "No command provided, logic error.");

        CommandContext ctx{args[0], args[1], std::vector<std::string>(args.begin() + 2, args.end())};

        if (ctx.command == "autocomplete") {
            CommandRegistry::instance().autocomplete(ctx);
            return 0;
        }

        const CommandInfo* info = CommandRegistry::instance().find_command(ctx.command);
        if (!info) {
            std::cerr << "Unknown command: " << ctx.command << std::endl;
            return 1;
        }
        if (info->requires_config && !gConfig().is_config_set()) {
            std::cerr << "Valid dropshell configuration required for command: " << ctx.command << std::endl;
            std::cerr << "Please run 'dropshell edit' to set up the dropshell configuration." << std::endl;
            return 1;
        }
        if (info->requires_install && !gConfig().is_agent_installed()) {
            std::cerr << "Dropshell agent not installed for command: " << ctx.command << std::endl;
            std::cerr << "Please run 'dropshell install' to install the local dropshell agent." << std::endl;
            return 1;
        }

        int arg_count = ctx.args.size();
        if (arg_count < info->min_args || (info->max_args != -1 && arg_count > info->max_args)) {
            std::cerr << "Invalid number of arguments for command: " << ctx.command << std::endl;
            std::cerr << "Usage: " << std::endl;
            std::cout << "  ";
            print_left_aligned(info->help_usage,30);
            std::cout << info->help_description << std::endl;
            return 1;
        }
        return info->handler(ctx);

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

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;
}

auto command_match = [](const std::string& cmd_list, int argc, char* argv[]) -> bool {
    std::istringstream iss(cmd_list);
    std::string cmd_item;
    while (iss >> cmd_item) {
        if (cmd_item == safearg(argc, argv, 1)) {
            return true;
        }
    }
    return false;
};

#define BOOLEXIT(CMD_LIST, RUNCMD) { \
    if (command_match(CMD_LIST, argc, argv)) { \
        return (RUNCMD) ? 0 : 1; \
    } \
}

#define HAPPYEXIT(CMD_LIST, RUNCMD) { \
    if (command_match(CMD_LIST, argc, argv)) { \
        RUNCMD; \
        return 0; \
    } \
}


int old_main(int argc, char* argv[]) {
    HAPPYEXIT("hash", hash_demo_raw(safearg(argc,argv,2)))
    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();

        std::string cmd = argv[1];


        // ------------------------------------------------------------
        // 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();

        HAPPYEXIT("templates", gTemplateManager().list_templates());

        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;
        }


        // handle running a command. 
        std::set<std::string> commands;
        get_all_used_commands(commands);

        autocomplete::merge_commands(commands, autocomplete::service_commands_require_config); // 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);
}