#include "smartbotic/runner/js_api.hpp"

#include <chrono>
#include <ctime>
#include <iomanip>
#include <random>
#include <sstream>

namespace smartbotic::runner {

auto GetJsApiCode() -> std::string {
    // This returns the JavaScript API code that's injected into the runtime
    // Most of the API is already set up in JsEngine::InitializeBuiltins()
    // This function provides additional utilities if needed
    return R"(
        // Additional API extensions can be added here
        // The core API (db, ctx, utils) is set up in the native code
    )";
}

auto FormatDate(int64_t timestamp, const std::string& format) -> std::string {
    std::time_t time = static_cast<std::time_t>(timestamp);
    std::tm tm_time{};
#ifdef _WIN32
    localtime_s(&tm_time, &time);
#else
    localtime_r(&time, &tm_time);
#endif

    std::ostringstream oss;
    std::string fmt = format;

    // Simple replacements
    auto replace = [&](const std::string& from, const std::string& to) {
        size_t pos = 0;
        while ((pos = fmt.find(from, pos)) != std::string::npos) {
            fmt.replace(pos, from.length(), to);
            pos += to.length();
        }
    };

    std::ostringstream year_ss;
    year_ss << std::setw(4) << std::setfill('0') << (tm_time.tm_year + 1900);
    replace("YYYY", year_ss.str());

    std::ostringstream month_ss;
    month_ss << std::setw(2) << std::setfill('0') << (tm_time.tm_mon + 1);
    replace("MM", month_ss.str());

    std::ostringstream day_ss;
    day_ss << std::setw(2) << std::setfill('0') << tm_time.tm_mday;
    replace("DD", day_ss.str());

    std::ostringstream hour_ss;
    hour_ss << std::setw(2) << std::setfill('0') << tm_time.tm_hour;
    replace("HH", hour_ss.str());

    std::ostringstream min_ss;
    min_ss << std::setw(2) << std::setfill('0') << tm_time.tm_min;
    replace("mm", min_ss.str());

    std::ostringstream sec_ss;
    sec_ss << std::setw(2) << std::setfill('0') << tm_time.tm_sec;
    replace("ss", sec_ss.str());

    return fmt;
}

auto FormatNumber(double num, int decimals, bool thousands_sep) -> std::string {
    std::ostringstream oss;
    oss << std::fixed << std::setprecision(decimals) << num;
    std::string result = oss.str();

    if (thousands_sep) {
        // Find decimal point
        auto dot_pos = result.find('.');
        std::string integer_part = (dot_pos != std::string::npos)
            ? result.substr(0, dot_pos)
            : result;
        std::string decimal_part = (dot_pos != std::string::npos)
            ? result.substr(dot_pos)
            : "";

        // Insert thousands separators
        std::string formatted;
        int count = 0;
        for (auto it = integer_part.rbegin(); it != integer_part.rend(); ++it) {
            if (count > 0 && count % 3 == 0 && *it != '-') {
                formatted = ',' + formatted;
            }
            formatted = *it + formatted;
            count++;
        }

        result = formatted + decimal_part;
    }

    return result;
}

auto Truncate(const std::string& str, size_t max_length) -> std::string {
    if (str.length() <= max_length) {
        return str;
    }
    if (max_length <= 3) {
        return str.substr(0, max_length);
    }
    return str.substr(0, max_length - 3) + "...";
}

auto Capitalize(const std::string& str) -> std::string {
    if (str.empty()) {
        return str;
    }
    std::string result = str;
    result[0] = static_cast<char>(std::toupper(static_cast<unsigned char>(result[0])));
    return result;
}

auto GenerateUuid() -> std::string {
    static std::random_device rd;
    static std::mt19937_64 gen(rd());
    static std::uniform_int_distribution<uint64_t> dis;

    uint64_t ab = dis(gen);
    uint64_t cd = dis(gen);

    // Set version to 4 and variant to 2
    ab = (ab & 0xFFFFFFFFFFFF0FFFULL) | 0x0000000000004000ULL;
    cd = (cd & 0x3FFFFFFFFFFFFFFFULL) | 0x8000000000000000ULL;

    char buf[37];
    snprintf(buf, sizeof(buf),
             "%08x-%04x-%04x-%04x-%012llx",
             static_cast<uint32_t>(ab >> 32),
             static_cast<uint16_t>((ab >> 16) & 0xFFFF),
             static_cast<uint16_t>(ab & 0xFFFF),
             static_cast<uint16_t>(cd >> 48),
             static_cast<unsigned long long>(cd & 0x0000FFFFFFFFFFFFULL));

    return std::string(buf);
}

}  // namespace smartbotic::runner