#include "agent/humanus.h"
#include "logger.h"
#include "prompt.h"
#include "flow/flow_factory.h"

#if defined (__unix__) || (defined (__APPLE__) && defined (__MACH__))
#include <signal.h>
#include <unistd.h>
#elif defined (_WIN32)
#define WIN32_LEAN_AND_MEAN
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#include <signal.h>
#endif

using namespace humanus;

#if defined (__unix__) || (defined (__APPLE__) && defined (__MACH__)) || defined (_WIN32)
static void sigint_handler(int signo) {
    if (signo == SIGINT) {
        logger->info("Interrupted by user\n");
        exit(0);
    }
}
#endif

static bool readline_utf8(std::string & line, bool multiline_input) {
#if defined(_WIN32)
    std::wstring wline;
    if (!std::getline(std::wcin, wline)) {
        // Input stream is bad or EOF received
        line.clear();
        GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0);
        return false;
    }

    int size_needed = WideCharToMultiByte(CP_UTF8, 0, &wline[0], (int)wline.size(), NULL, 0, NULL, NULL);
    line.resize(size_needed);
    WideCharToMultiByte(CP_UTF8, 0, &wline[0], (int)wline.size(), &line[0], size_needed, NULL, NULL);
#else
    if (!std::getline(std::cin, line)) {
        // Input stream is bad or EOF received
        line.clear();
        return false;
    }
#endif
    if (!line.empty()) {
        char last = line.back();
        if (last == '/') { // Always return control on '/' symbol
            line.pop_back();
            return false;
        }
        if (last == '\\') { // '\\' changes the default action
            line.pop_back();
            multiline_input = !multiline_input;
        }
    }
    line += '\n';

    // By default, continue input if multiline_input is set
    return multiline_input;
}

int main() {

    // ctrl+C handling
    {
#if defined (__unix__) || (defined (__APPLE__) && defined (__MACH__))
        struct sigaction sigint_action;
        sigint_action.sa_handler = sigint_handler;
        sigemptyset (&sigint_action.sa_mask);
        sigint_action.sa_flags = 0;
        sigaction(SIGINT, &sigint_action, NULL);
#elif defined (_WIN32)
        auto console_ctrl_handler = +[](DWORD ctrl_type) -> BOOL {
            return (ctrl_type == CTRL_C_EVENT) ? (sigint_handler(SIGINT), true) : false;
        };
        SetConsoleCtrlHandler(reinterpret_cast<PHANDLER_ROUTINE>(console_ctrl_handler), true);
        SetConsoleCP(CP_UTF8);
        SetConsoleOutputCP(CP_UTF8);
        _setmode(_fileno(stdin), _O_WTEXT); // wide character input mode
#endif
    }
    
    Humanus agent = Humanus();
    while (true) {
        if (agent.current_step == agent.max_steps) {
            std::cout << "Automatically paused after " << agent.max_steps << " steps." << std::endl;
            std::cout << "Enter your prompt (enter an empty line to resume or 'exit' to quit): ";
            agent.reset(false);
        } else {
            std::cout << "Enter your prompt (or 'exit' to quit): ";
        }
        std::string prompt;
        readline_utf8(prompt, false);
        if (prompt == "exit" || prompt == "exit\n") {
            logger->info("Goodbye!");
            break;
        }
        logger->info("Processing your request...");
        agent.run(prompt);
    }
}