/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2019, Danny Robson <danny@nerdcruft.net>
 */

#include "console.hpp"

#include "../level.hpp"
#include "../packet.hpp"

#include "../../term.hpp"
#include "../../debug/assert.hpp"
#include "../../cast.hpp"

#include <iomanip>
#include <iostream>

#include <ctime>
#include <cstring>

using cruft::log::sink::console;


///////////////////////////////////////////////////////////////////////////////
static std::size_t
level_width (void)
{
    static constexpr
    cruft::log::level_t
        ALL_LEVELS[] = {
        cruft::log::EMERGENCY,
        cruft::log::ALERT,
        cruft::log::CRITICAL,
        cruft::log::ERROR,
        cruft::log::WARN,
        cruft::log::NOTICE,
        cruft::log::INFO,
        cruft::log::DEBUG,
    };


    static size_t width = [] {
        size_t hi = 0;

        for (auto i: ALL_LEVELS)
            hi = cruft::max (to_string (i).size (), hi);

        return hi;
    } ();

    return width;
}


///////////////////////////////////////////////////////////////////////////////
static
cruft::term::csi::graphics
level_colour (cruft::log::level_t level)
{
    using cruft::term::csi::graphics;

    switch (level) {
        case cruft::log::EMERGENCY:
        case cruft::log::ALERT:
        case cruft::log::CRITICAL:
        case cruft::log::ERROR:
            return graphics (graphics::FOREGROUND, graphics::RED);

        case cruft::log::WARNING:
            return graphics (graphics::FOREGROUND, graphics::YELLOW);

        case cruft::log::NOTICE:
        case cruft::log::INFORMATIONAL:
            return graphics (graphics::FOREGROUND, graphics::GREEN);

        case cruft::log::DEBUG:
            return graphics (graphics::FOREGROUND, graphics::WHITE);
    }

    unreachable ();
}


///////////////////////////////////////////////////////////////////////////////
console::console (std::string name)
    : crtp (std::move (name))
{ ; }


///////////////////////////////////////////////////////////////////////////////
void
console::write (packet const &val)
{
    if (val.level <= log_level ()) {
        static const size_t time_len = strlen("YYYY-mm-dd HHMMhSS") + 1;
        std::string time_string (time_len - 1, '\0');
        time_t unix_time = time (nullptr);

        if (0 == strftime (&time_string[0],
                           time_len,
                           "%Y-%m-%d %H%Mh%S",
                           localtime (&unix_time))) {
            warn ("failed to log time");
            return;
        }

        std::clog << time_string << " ["
            << level_colour (val.level)
            << std::setw (cruft::cast::lossless<int> (level_width ()))
            << std::left
            << val.level
            << std::setw (0)
            << cruft::term::csi::graphics::RESET
            << "] " << val.message << std::endl;
    }

    if (needs_break (val.level))
        breakpoint ();
}