package main

import (
	"bytes"
	pathpkg "path"
	"strings"
)

// Format represents an output format.
type Format interface {
	Format(*Page) (path string, content []byte)
}

type FormatFunc func(*Page) (string, []byte)

func (f FormatFunc) Format(p *Page) (string, []byte) {
	return f(p)
}

// GeminiToHTML returns an output format that converts Gemini text to HTML.
func GeminiToHTML(cfg *Config) Format {
	return FormatFunc(func(p *Page) (path string, content []byte) {
		path = pathpkg.Join(p.Path, "index.html")

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

		// 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
	})
}