// Copyright 2013 Prometheus Team
// 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 web

import (
	"html/template"
	"reflect"
	"time"
)

// By Russ Cox, https://groups.google.com/d/msg/golang-nuts/OEdSDgEC7js/iyhU9DW_IKcJ.
func eq(args ...interface{}) bool {
	if len(args) == 0 {
		return false
	}
	x := args[0]
	switch x := x.(type) {
	case string, int, int64, byte, float32, float64:
		for _, y := range args[1:] {
			if x == y {
				return true
			}
		}
		return false
	}

	for _, y := range args[1:] {
		if reflect.DeepEqual(x, y) {
			return true
		}
	}
	return false
}

func timeSince(t time.Time) string {
	return time.Now().Round(time.Second / 10).Sub(t.Round(time.Second / 10)).String()
}

func truncate(str string, n int) string {
	if len(str) <= n {
		return str
	}
	return str[:n] + "..."
}

var webHelpers = template.FuncMap{
	"eq":        eq,
	"timeSince": timeSince,
	"truncate":  truncate,
}