// Copyright (C) 2022 Mya Pitzeruse
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

package okit

import (
	"context"
	"crypto/rand"
	"encoding/base64"
	"io"
	"time"
)

// contextKey is a holder structure that allows data to be attached to contexts.
type contextKey string

// spanKey identifies a span on a given context.
var spanKey = contextKey("okit.span")

// TODO: allow this to be replaced
var defaultClient Interface[Client] = Client{
	now: time.Now,
	uuid: func() string {
		buf := make([]byte, 16)
		n, err := io.ReadFull(rand.Reader, buf)
		if err != nil {
			panic(err)
		}

		return base64.RawStdEncoding.EncodeToString(buf[:n])
	},
}

func With(tags ...Tag) Client {
	return defaultClient.With(tags...)
}

func Emit(event string, tags ...Tag) {
	defaultClient.Emit(event, tags...)
}

func Observe(metric string, value float64, tags ...Tag) {
	defaultClient.Observe(metric, value, tags...)
}

func Trace(ctx context.Context, tags ...Tag) (context.Context, DoneFunc) {
	return defaultClient.Trace(ctx, tags...)
}

func Debug(msg string, tags ...Tag) {
	defaultClient.Debug(msg, tags...)
}

func Info(msg string, tags ...Tag) {
	defaultClient.Info(msg, tags...)
}

func Warn(msg string, tags ...Tag) {
	defaultClient.Warn(msg, tags...)
}

func Error(msg string, tags ...Tag) {
	defaultClient.Error(msg, tags...)
}