package handler

import (
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"codeberg.org/VARASYS/ZDDC/zddc/internal/config"
)

// Custom CSS pipeline. Lets an operator drop `.profile.css` (or the
// legacy `.admin.css`) at the deployment root and have it picked up
// automatically as styling for the profile page. Previously lived
// alongside the retired form editor; kept because the profile page
// still relies on it.

const (
	profileCustomCSSName = ".profile.css"
	adminCustomCSSName   = ".admin.css" // legacy fallback
)

// hasCustomProfileCSS reports whether <fsRoot>/.profile.css (or the
// legacy .admin.css) exists. The profile template uses this to decide
// whether to inject the <link> tag.
func hasCustomProfileCSS(fsRoot string) bool {
	if _, err := os.Stat(filepath.Join(fsRoot, profileCustomCSSName)); err == nil {
		return true
	}
	if _, err := os.Stat(filepath.Join(fsRoot, adminCustomCSSName)); err == nil {
		return true
	}
	return false
}

// profileAssetsPathPrefix is the URL prefix for admin static assets.
// Lived at /.profile/zddc/assets/ during the form-editor era; renamed
// once the form editor retired. The only consumer is the profile page,
// which emits a <link> to /custom.css when an operator has placed one
// at root.
const profileAssetsPathPrefix = ProfilePathPrefix + "/assets"

// serveProfileAssets handles GET /.profile/assets/<file>. V1 only
// ships `custom.css` (passthrough of <root>/.profile.css when
// present, falling back to <root>/.admin.css); other paths return
// 404 so we don't accidentally expose arbitrary files. The caller
// (profilehandler.go) has already gated on admin scope.
func serveProfileAssets(cfg config.Config, w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		w.Header().Set("Allow", "GET")
		http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
		return
	}
	rest := strings.TrimPrefix(r.URL.Path, profileAssetsPathPrefix+"/")
	switch rest {
	case "custom.css":
		path := filepath.Join(cfg.Root, profileCustomCSSName)
		if fi, err := os.Stat(path); err != nil || fi.IsDir() {
			path = filepath.Join(cfg.Root, adminCustomCSSName)
			if fi, err := os.Stat(path); err != nil || fi.IsDir() {
				http.NotFound(w, r)
				return
			}
		}
		w.Header().Set("Content-Type", "text/css; charset=utf-8")
		w.Header().Set("Cache-Control", "no-cache")
		http.ServeFile(w, r, path)
	default:
		http.NotFound(w, r)
	}
}