module utils.log;

import std.stdio;
import std.format;
import std.conv;
import core.time;
import std.typecons;

import grimoire;

enum LogLevel {
    INFOLOW, // Reserved for hot loop logging
    INFOMED, // Reserved for loop repeated events
    INFOHIGH, // Reserved for non loop rare events
    DEBUG, // Reserved for sensitive events that may be bugs
    WARN, // Reserved for pending bugs
    ERROR // Reserved for bugs that may cause a crash in hot loop, should be guarded
}

enum CurrentLogLevel = LogLevel.INFOLOW;

public void log(LogLevel lvl, string data) {
    static Nullable!MonoTime start;
    if(start.isNull) start = MonoTime.currTime;
    if(lvl >= CurrentLogLevel) writeln(format("%7.6f : %s : %s",(MonoTime.currTime - start.get).total!("hnsecs")/10_000_000.0, std.conv.to!string(lvl), data));
}

public void grLog(GrCall call) {
    log(call.getEnum!LogLevel(0), "Gr> " ~ call.getString(1));
}

public GrLibrary getLogLibrary() {
    auto lib = new GrLibrary();
    auto loglvl_t = lib.addEnum("LogLevel", ["INFOLOW", "INFOMED", "INFOHIGH", "DEBUG", "WARN", "ERROR"]);
    lib.addFunction(&grLog, "log", [loglvl_t, grString]);
    return lib;
}