// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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 hugolib

import (
	"sort"
)

type Index map[string]Pages
type IndexList map[string]Index

type OrderedIndex []*Pages
type OrderedIndexList map[string]OrderedIndex

// KeyPrep... Indexes should be case insensitive. Can make it easily conditional later.
func kp(in string) string {
	return Urlize(in)
}

func (i Index) Get(key string) Pages { return i[kp(key)] }
func (i Index) Count(key string) int { return len(i[kp(key)]) }
func (i Index) Add(key string, p *Page) {
	key = kp(key)
	i[key] = append(i[key], p)
}

func (l IndexList) BuildOrderedIndexList() *OrderedIndexList {
	oil := make(OrderedIndexList, len(l))
	for idx_name, index := range l {
		i := 0
		oi := make(OrderedIndex, len(index))
		for _, e := range index {
			oi[i] = &e
			i++
		}
		oi.Sort()
		oil[idx_name] = oi
	}
	return &oil
}

func (idx OrderedIndex) Len() int { return len(idx) }

func (idx OrderedIndex) Less(i, j int) bool       { return len(*idx[i]) < len(*idx[j]) }
func (idx OrderedIndex) Swap(i, j int)            { idx[i], idx[j] = idx[j], idx[i] }
func (idx OrderedIndex) Sort()                    { sort.Sort(idx) }
func (idx OrderedIndex) Limit(n int) OrderedIndex { return idx[0:n] }