/* -*- c-file-style: "ruby"; indent-tabs-mode: nil -*- */
/*
 *  Copyright (C) 2011-2019  Ruby-GNOME Project Team
 *  Copyright (C) 2002-2005 Masao Mutoh
 *  Copyright (C) 1998-2000 Yukihiro Matsumoto,
 *                          Daisuke Kanda,
 *                          Hiroshi Igarashi
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#include "rbgprivate.h"

#define RG_TARGET_NAMESPACE mLog

static VALUE rbglib_log_handler_procs;
static gboolean log_canceled;

static const gchar *
logmessage(GLogLevelFlags level)
{
    if (level & G_LOG_LEVEL_ERROR){
        return "ERROR";
    } else if (level & G_LOG_LEVEL_CRITICAL){
        return "CRITICAL";
    } else if (level & G_LOG_LEVEL_WARNING){
        return "WARNING";
    } else if (level & G_LOG_LEVEL_MESSAGE){
        return "MESSAGE";
    } else if (level & G_LOG_LEVEL_INFO){
        return "INFO";
    } else if (level & G_LOG_LEVEL_DEBUG){
        return "DEBUG";
    }
    return "UNKNOWN";
}

static VALUE
rbg_printerr(VALUE message,
             G_GNUC_UNUSED VALUE user_data,
             G_GNUC_UNUSED int argc,
             G_GNUC_UNUSED const VALUE *argv,
             G_GNUC_UNUSED VALUE block)
{
    g_printerr("\tfrom %.*s\n",
               (int)RSTRING_LEN(message),
               RSTRING_PTR(message));
    return Qnil;
}

static void
rbglib_log_handler(const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, gpointer user_data)
{
    if (!log_canceled) {
        g_printerr("%s-%s **: %s\n",
                   log_domain, logmessage(log_level), message);
        if (rb_during_gc()) {
            g_printerr("\tfrom %s:%d\n", rb_sourcefile(), rb_sourceline());
        } else {
            VALUE backtrace = rb_funcall(rb_mKernel, rb_intern("caller"), 0);
            ID id_each;
            CONST_ID(id_each, "each");
            rb_block_call(backtrace, id_each, 0, NULL, rbg_printerr, Qnil);
        }
    } else {
        g_log_default_handler(log_domain, log_level, message, user_data);
    }
}

/* Use Internal only */
static VALUE
rg_s_cancel_handler(G_GNUC_UNUSED VALUE self)
{
    log_canceled = TRUE;
    return Qnil;
}

static VALUE
rg_s_set_handler(VALUE self, VALUE domain, VALUE levels)
{
    guint handler_id = g_log_set_handler(RVAL2CSTR_ACCEPT_NIL(domain),
                                         NUM2INT(levels),
                                         (GLogFunc)rbglib_log_handler, (gpointer)self);
    return UINT2NUM(handler_id);
}

static VALUE
rg_s_remove_handler(VALUE self, VALUE domain, VALUE handler_id)
{
    g_log_remove_handler(RVAL2CSTR_ACCEPT_NIL(domain),
                         NUM2UINT(handler_id));
    G_REMOVE_RELATIVE(self, handler_id, rbglib_log_handler_procs);
    return Qnil;
}

static VALUE
rg_s_set_always_fatal(G_GNUC_UNUSED VALUE self, VALUE fatal_mask)
{
    return INT2NUM(g_log_set_always_fatal(NUM2INT(fatal_mask)));
}

static VALUE
rg_s_set_fatal_mask(G_GNUC_UNUSED VALUE self, VALUE domain, VALUE fatal_mask)
{
    return INT2NUM(g_log_set_fatal_mask(RVAL2CSTR_ACCEPT_NIL(domain),
                                        NUM2INT(fatal_mask)));
}

static VALUE
rg_s_log(G_GNUC_UNUSED VALUE self, VALUE domain, VALUE level, VALUE str)
{
    g_log(RVAL2CSTR_ACCEPT_NIL(domain), NUM2INT(level), "%s", RVAL2CSTR(str));
    return Qnil;
}

void
Init_glib_messages(void)
{
    VALUE RG_TARGET_NAMESPACE = rb_define_module_under(rbg_mGLib(), "Log");

    log_canceled = FALSE;

    rb_global_variable(&rbglib_log_handler_procs);
    rbglib_log_handler_procs = rb_hash_new();
    RG_DEF_SMETHOD(set_handler, 2);
    RG_DEF_SMETHOD(remove_handler, 2);
    RG_DEF_SMETHOD(cancel_handler, 0);
    RG_DEF_SMETHOD(set_always_fatal, 1);
    RG_DEF_SMETHOD(set_fatal_mask, 2);
    RG_DEF_SMETHOD(log, 3);

    rb_define_const(RG_TARGET_NAMESPACE, "FATAL_MASK", INT2NUM(G_LOG_FATAL_MASK));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_USER_SHIFT", INT2NUM(G_LOG_LEVEL_USER_SHIFT));

    /* GLogLevelFlags */
    rb_define_const(RG_TARGET_NAMESPACE, "FLAG_RECURSION", INT2NUM(G_LOG_FLAG_RECURSION));
    rb_define_const(RG_TARGET_NAMESPACE, "FLAG_FATAL", INT2NUM(G_LOG_FLAG_FATAL));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_ERROR", INT2NUM(G_LOG_LEVEL_ERROR));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_CRITICAL", INT2NUM(G_LOG_LEVEL_CRITICAL));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_WARNING", INT2NUM(G_LOG_LEVEL_WARNING));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_MESSAGE", INT2NUM(G_LOG_LEVEL_MESSAGE));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_INFO", INT2NUM(G_LOG_LEVEL_INFO));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_DEBUG", INT2NUM(G_LOG_LEVEL_DEBUG));
    rb_define_const(RG_TARGET_NAMESPACE, "LEVEL_MASK", INT2NUM(G_LOG_LEVEL_MASK));
}