package main

import (
	"bytes"
	"flag"
	"log"
	pathpkg "path"
	"strings"

	"git.sr.ht/~adnano/go-gemini"
)

func main() {
	if err := run(); err != nil {
		log.Fatal(err)
	}
}

func run() error {
	// whether or not to output HTML
	var toHTML bool
	flag.BoolVar(&toHTML, "html", false, "output HTML")
	flag.Parse()

	// Load config
	cfg := NewConfig()
	if err := cfg.Load("config.ini"); err != nil {
		return err
	}
	if err := cfg.LoadTemplates("templates"); err != nil {
		return err
	}

	// Load content
	dir := NewDir("")
	if err := dir.read("src", ""); err != nil {
		return err
	}
	dir.sort()
	// Manipulate content
	if err := dir.manipulate(cfg); err != nil {
		return err
	}
	// Write content
	if err := dir.write("dst", outputGemini, cfg); err != nil {
		return err
	}
	if toHTML {
		if err := dir.write("html", outputHTML, cfg); err != nil {
			return err
		}
	}
	return nil
}

// outputFormat represents an output format.
type outputFormat func(*Page, *Config) (path string, content []byte)

// outputGemini outputs the page as Gemini text.
func outputGemini(p *Page, cfg *Config) (path string, content []byte) {
	path = p.Path + "index.gmi"
	content = []byte(p.Content)
	return
}

// outputHTML outputs the page as HTML.
func outputHTML(p *Page, cfg *Config) (path string, content []byte) {
	path = p.Path + "index.html"

	r := strings.NewReader(p.Content)
	text := gemini.ParseText(r)
	content = textToHTML(text)

	// html template context
	type htmlCtx struct {
		Title   string // page title
		Content string // page HTML contents
	}

	var b bytes.Buffer
	// clean path to remove trailing slash
	dir := pathpkg.Dir(pathpkg.Clean(p.Path))
	tmpl := cfg.Templates.FindTemplate(dir, "output.html")
	tmpl.Execute(&b, &htmlCtx{
		Title:   p.Title,
		Content: string(content),
	})
	content = b.Bytes()
	return
}