package main

import (
	"bytes"
	"errors"
	"fmt"
	"net/url"
	"regexp"
	"sort"
	"strings"
)

func (fileContent *FileContent) FormatContent() string {
	content := fileContent.Content
	content = strings.Trim(content, "/n")

	badChars := make(map[string]string)
	badChars["ā"] = "ā"
	badChars["ē"] = "ē"
	badChars["ī"] = "ī"
	badChars["ō"] = "ō"
	badChars["ū"] = "ū"
	for k, v := range badChars {
		content = strings.ReplaceAll(content, k, v)
	}

	var buffer []byte
	data := []byte(content)
	re := regexp.MustCompile(`!?\[([^\]*]*)\]\(([^ ]*)\)`)

	for i, match := range re.FindAllSubmatch(data, -1) {
		replaceWithIndex := append(match[1], fmt.Sprintf("[%d]", i+1)...)
		data = bytes.Replace(data, match[0], replaceWithIndex, 1)
		// append entry to buffer to be added later
		link := fmt.Sprintf("=> %s %d: %s\n", match[2], i+1, match[1])
		buffer = append(buffer, link...)
	}
	// append links to that paragraph
	if len(buffer) > 0 {
		data = append(data, []byte("\n\n---\n")...)
		data = append(data, buffer...)
	}

	return string(data)
}

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 (file *TreeFile) CategoryPath() string {
	return "/" + strings.Join(file.Category, "/")
}

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

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