package main

import (
	"html/template"
	"strings"
)

var funmap = template.FuncMap{
	"toCredits":  tplToCredits,
	"htmlify":    tplHtmlify,
	"toGlossary": tplToGlossary,
	"firstLine":  tplFirstLine,
}

func tplToCredits(str string) template.HTML {
	// Make first line an heading
	idx := strings.IndexRune(str, '\n')
	if idx > 0 {
		str = "<h1>" + str[:idx] + "</h1><p>" + str[idx+1:]
	}
	// Wrap other lines in <p> tags
	str = strings.ReplaceAll(str, "\n", "</p><p>") + "</p>"
	return template.HTML(str)
}

func tplHtmlify(str string) template.HTML {
	// Replace newlines with paragraph blocks
	str = strings.ReplaceAll(str, "\n", "</p><p>")
	return template.HTML(str)
}

func tplFirstLine(str string) string {
	newline := strings.IndexRune(str, '\n')
	if newline < 0 {
		return str
	}
	return str[:newline]
}

type glossaryEntry struct {
	Keyword    string
	Definition string
}

func tplToGlossary(str string) (glob []glossaryEntry) {
	lines := strings.Split(str, "\n")
	for _, line := range lines {
		// Skip empty lines
		line = strings.TrimSpace(line)
		if len(line) < 1 {
			continue
		}

		// Find delimiter
		delim := strings.IndexRune(line, ':')
		if delim < 0 {
			// No delim? Add to last entry
			glob[len(glob)-1].Definition += line
			continue
		}

		glob = append(glob, glossaryEntry{
			Keyword:    line[:delim],
			Definition: strings.TrimSpace(line[delim+1:]),
		})
	}
	return
}