// Copyright 2013 gopm authors.
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.

package doc

import (
	"fmt"
	"runtime"
	"strings"
)

const (
	Gray = uint8(iota + 90)
	Red
	Green
	Yellow
	Blue
	Magenta
	//NRed      = uint8(31) // Normal
	EndColor = "\033[0m"
)

// ColorLog colors log and print to stdout.
// Log format: <level> <content [highlight][path]> [ error ].
// Level: TRAC -> blue; ERRO -> red; WARN -> Magenta; SUCC -> green; others -> default.
// Content: default; path: yellow; error -> red.
// Level has to be surrounded by "[" and "]".
// Highlights have to be surrounded by "# " and " #"(space).
// Paths have to be surrounded by "( " and " )"(sapce).
// Errors have to be surrounded by "[ " and " ]"(space).
func ColorLog(format string, a ...interface{}) {
	log := fmt.Sprintf(format, a...)
	if runtime.GOOS != "windows" {
		var clog string

		// Level.
		i := strings.Index(log, "]")
		if log[0] == '[' && i > -1 {
			clog += "[" + getColorLevel(log[1:i]) + "]"
		}

		log = log[i+1:]

		// Error.
		log = strings.Replace(log, "[ ", fmt.Sprintf("[\033[%dm", Red), -1)
		log = strings.Replace(log, " ]", EndColor+"]", -1)

		// Path.
		log = strings.Replace(log, "( ", fmt.Sprintf("(\033[%dm", Yellow), -1)
		log = strings.Replace(log, " )", EndColor+")", -1)

		// Highlights.
		log = strings.Replace(log, "# ", fmt.Sprintf("\033[%dm", Gray), -1)
		log = strings.Replace(log, " #", EndColor, -1)

		log = clog + log
	}

	fmt.Print(log)
}

// getColorLevel returns colored level string by given level.
func getColorLevel(level string) string {
	level = strings.ToUpper(level)
	switch level {
	case "TRAC":
		return fmt.Sprintf("\033[%dm%s\033[0m", Blue, level)
	case "ERRO":
		return fmt.Sprintf("\033[%dm%s\033[0m", Red, level)
	case "WARN":
		return fmt.Sprintf("\033[%dm%s\033[0m", Magenta, level)
	case "SUCC":
		return fmt.Sprintf("\033[%dm%s\033[0m", Green, level)
	default:
		return level
	}
}