package local

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"
)

var pageIndex map[string]PageList

func (p *Page) RebuildIndex() error {
	pageIndex = nil
	_, err := p.Index()
	return err
}

// Index returns a map of all pages below the current Page's Path seperated
// into their respective tags If a Page has multiple tags it will be listed
// under each
func (p *Page) Index() (map[string]PageList, error) {
	if pageIndex != nil {
		return pageIndex, nil
	}
	fmt.Fprintln(os.Stderr, "Rebuilding index...")

	out := make(map[string]PageList)

	var pageErr error

	filepath.Walk(filepath.Dir(p.Path),
		func(path string, info os.FileInfo, err error) error {
			if err != nil {
				return err
			}

			if !info.IsDir() && strings.HasSuffix(info.Name(), ".md") {

				p2 := &Page{Path: strings.ReplaceAll(path, ".md", "")}
				err = p2.Read()

				if err != nil {
					pageErr = err
					fmt.Fprintln(os.Stderr, "Error encountered: ", err)
					return err
				}

				for tag, _ := range p2.Tags {
					if _, ok := out[tag]; !ok {
						out[tag] = []*Page{p2}
					} else {
						out[tag] = append(out[tag], p2)
					}
				}

			}

			return nil
		})

	pageIndex = out

	return out, nil
}

func (p *Page) Time() time.Time {
	return p.Date.Time
}