/*
goredo -- redo implementation on pure Go
Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.

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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

// Logging facilities

package main

import (
	"fmt"
	"os"
	"strings"
)

const (
	CReset   = "\033[0m"
	CBold    = "\033[1m"
	CBlack   = "\033[30;1m"
	CRed     = "\033[31;1m"
	CGreen   = "\033[32;1m"
	CYellow  = "\033[33;1m"
	CBlue    = "\033[34;1m"
	CMagenta = "\033[35;1m"
	CCyan    = "\033[36;1m"
	CWhite   = "\033[37;1m"

	CDebug = CYellow
	CRedo  = CGreen
	CWait  = CBlue
	CLock  = CCyan
	CErr   = CRed
	CWarn  = CMagenta
	CJS    = CWhite
	CNone  = "NONE"
)

var (
	NoColor bool
	Debug   bool
	LogWait bool
	LogLock bool
	LogJS   bool
	MyPid   int
)

func trace(level, format string, args ...interface{}) {
	var p string
	if MyPid != 0 {
		p = fmt.Sprintf("[%d] ", MyPid)
	}
	switch level {
	case CNone:
		os.Stderr.WriteString(StderrPrefix + p + fmt.Sprintf(format+"\n", args...))
		return
	case CDebug:
		if !Debug {
			return
		}
		p += "dbg  "
	case CWait:
		if !(LogWait || Debug) {
			return
		}
		p += "wait "
	case CRedo:
		p += "redo "
	case CLock:
		if !(LogLock || Debug) {
			return
		}
		p += "lock "
	case CJS:
		if !(LogJS || Debug) {
			return
		}
		p += "js   "
	case CErr:
		p += "err  "
	case CWarn:
		p += "warn "
	}
	msg := fmt.Sprintf(format, args...)
	msg = StderrPrefix + colourize(level, p+strings.Repeat(". ", Level)+msg)
	os.Stderr.WriteString(msg + "\n")
}

func colourize(colour, s string) string {
	if NoColor {
		return s
	}
	return colour + s + CReset
}