#include "AlexaLog.h"
#include <stdarg.h>

// This file names the levels. A build flag such as -DDEBUG defines its macro here as well (see AlexaLog.h).
#undef NONE
#undef ERROR
#undef INFO
#undef DEBUG

AlexaLogLevel AlexaLog::level = AlexaLogLevel::INFO;
Print *AlexaLog::output = &Serial;

void AlexaLog::setLevel(AlexaLogLevel newLevel)
{
    level = newLevel;
}

AlexaLogLevel AlexaLog::getLevel()
{
    return level;
}

void AlexaLog::setOutput(Print *newOutput)
{
    output = newOutput;
}

bool AlexaLog::enabled(AlexaLogLevel lineLevel)
{
    return output != nullptr && lineLevel != AlexaLogLevel::NONE && lineLevel <= level;
}

void AlexaLog::write(AlexaLogLevel lineLevel, PGM_P format, ...)
{
    if (!enabled(lineLevel))
    {
        return;
    }

    // vsnprintf and not vsnprintf_P: on the ESP8266 vsnprintf reads a PROGMEM format itself (vsnprintf_P is a jump
    // to it), and vsnprintf_P comes in one object with printf_P and sprintf_P, which link the FILE-based printf:
    // 5.8 KB of flash.
    char line[160];
    va_list arguments;
    va_start(arguments, format);
    int written = vsnprintf(line, sizeof(line), format, arguments);
    va_end(arguments);
    if (written < 0)
    {
        return;
    }

    output->print(lineLevel == AlexaLogLevel::ERROR ? F("[Alex2ESP] error: ") : F("[Alex2ESP] "));
    output->println(line);
}