// createMetadata generates Metadata for a new page based upon the metadata
// found in an archetype.
func createMetadata(archetype parser.Page, name string) (map[string]interface{}, error) {
	archMetadata, err := archetype.Metadata()
	if err != nil {
		return nil, err
	}

	metadata, err := cast.ToStringMapE(archMetadata)
	if err != nil {
		return nil, err
	}

	for k := range metadata {
		switch strings.ToLower(k) {
		case "date":
			metadata[k] = time.Now()
		case "title":
			metadata[k] = helpers.MakeTitle(helpers.Filename(name))
		}
	}

	caseimatch := func(m map[string]interface{}, key string) bool {
		for k := range m {
			if strings.ToLower(k) == strings.ToLower(key) {
				return true
			}
		}
		return false
	}

	if metadata == nil {
		metadata = make(map[string]interface{})
	}

	if !caseimatch(metadata, "date") {
		metadata["date"] = time.Now()
	}

	if !caseimatch(metadata, "title") {
		metadata["title"] = helpers.MakeTitle(helpers.Filename(name))
	}

	if x := parser.FormatSanitize(viper.GetString("metaDataFormat")); x == "json" || x == "yaml" || x == "toml" {
		metadata["date"] = time.Now().Format(time.RFC3339)
	}

	return metadata, nil
}

// undraftContent: if the content is a draft, change its draft status to
// 'false' and set the date to time.Now(). If the draft status is already
// 'false', don't do anything.
func undraftContent(p parser.Page) (bytes.Buffer, error) {
	var buff bytes.Buffer
	// get the metadata; easiest way to see if it's a draft
	meta, err := p.Metadata()
	if err != nil {
		return buff, err
	}
	// since the metadata was obtainable, we can also get the key/value separator for
	// Front Matter
	fm := p.FrontMatter()
	if fm == nil {
		err := fmt.Errorf("Front Matter was found, nothing was finalized")
		return buff, err
	}

	var isDraft, gotDate bool
	var date string
L:
	for k, v := range meta.(map[string]interface{}) {
		switch k {
		case "draft":
			if !v.(bool) {
				return buff, fmt.Errorf("not a Draft: nothing was done")
			}
			isDraft = true
			if gotDate {
				break L
			}
		case "date":
			date = v.(string) // capture the value to make replacement easier
			gotDate = true
			if isDraft {
				break L
			}
		}
	}

	// if draft wasn't found in FrontMatter, it isn't a draft.
	if !isDraft {
		return buff, fmt.Errorf("not a Draft: nothing was done")
	}

	// get the front matter as bytes and split it into lines
	var lineEnding []byte
	fmLines := bytes.Split(fm, []byte("\n"))
	if len(fmLines) == 1 { // if the result is only 1 element, try to split on dos line endings
		fmLines = bytes.Split(fm, []byte("\r\n"))
		if len(fmLines) == 1 {
			return buff, fmt.Errorf("unable to split FrontMatter into lines")
		}
		lineEnding = append(lineEnding, []byte("\r\n")...)
	} else {
		lineEnding = append(lineEnding, []byte("\n")...)
	}

	// Write the front matter lines to the buffer, replacing as necessary
	for _, v := range fmLines {
		pos := bytes.Index(v, []byte("draft"))
		if pos != -1 {
			v = bytes.Replace(v, []byte("true"), []byte("false"), 1)
			goto write
		}
		pos = bytes.Index(v, []byte("date"))
		if pos != -1 { // if date field wasn't found, add it
			v = bytes.Replace(v, []byte(date), []byte(time.Now().Format(time.RFC3339)), 1)
		}
	write:
		buff.Write(v)
		buff.Write(lineEnding)
	}

	// append the actual content
	buff.Write([]byte(p.Content()))

	return buff, nil
}