package page

import (
	"bytes"
	"errors"
	"io/fs"
	"net/http"
)

// RenderMarkdown is analogous to Render, except it spits out rendered markdown
// as text/plain. It also sets .Vars.RenderingMarkdownOnly so templates can
// vary on whether or not they're plain markdown. For instance, not including
// some HTML tags.
func RenderMarkdown(w http.ResponseWriter, r *http.Request,
	path string, vars map[string]interface{}, statusCode int) {
	// Sepcifically use the specified path for the page
	p := NewPage(path)

	if vars != nil {
		p.Vars = vars
	}

	if p.Vars != nil {
		p.Vars["RenderingMarkdownOnly"] = true
	} else {
		p.Vars = map[string]interface{}{
			"RenderingMarkdownOnly": true,
		}
	}

	buf := &bytes.Buffer{}

	err := p.Render(buf)
	if err != nil {
		if errors.Is(err, fs.ErrNotExist) {
			plainResp(w, http.StatusNotFound, "Not found")

			return
		}

		logErr(r, "while rendering", err)
		plainResp(w, http.StatusInternalServerError, "Internal server error")

		return
	}

	// Error was handled above
	md, _ := p.GetMarkdown()

	w.Header().Set("Content-type", "text/plain")
	w.WriteHeader(statusCode)

	_, err = w.Write([]byte(md))
	if err != nil {
		logErr(r, "while writing buf", err)

		return
	}

	logReq(r, statusCode)
}