package main

import (
	"errors"
	"net/url"
	"sort"
	"strings"
)

func (file *TreeFile) CategoriesAsUrl() string {
	escapedCategories := []string{}
	for _, c := range file.Category {
		escapedCategories = append(escapedCategories, url.QueryEscape(c))
	}

	return strings.Join(escapedCategories, "/")
}

func (file *TreeFile) GmiName() string {
	return strings.Replace(file.Name, ".md", ".gmi", 1)
}

func (tree *Tree) GetIndexFile() (*TreeFile, error) {
	for _, file := range tree.RootFiles {
		if file.Name == "index.md" {
			return file, nil
		}
	}

	return nil, errors.New("index file not found")
}
func (tree *Tree) HasIndexFile() bool {
	_, err := tree.GetIndexFile()
	if err != nil {
		return false
	}

	return true
}

func GetLastFiles(files []*TreeFile) []*TreeFile {
	sortingFiles := make(map[string]*TreeFile)
	for _, f := range files {
		sortingFiles[f.Created+f.Id] = f
	}

	keys := make([]string, 0, len(sortingFiles))
	for k := range sortingFiles {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	sort.Reverse(sort.StringSlice(keys))

	length := 10
	if len(keys) < 10 {
		length = len(keys)
	}
	lastFiles := make([]*TreeFile, 0, length)
	for i, k := range keys {
		if i == length {
			break
		}

		lastFiles = append(lastFiles, sortingFiles[k])
	}

	return lastFiles
}