// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0

package admin

import (
	"fmt"
	"net/http"
	"strings"

	"sourcedock.dev/petrbalvin/volumen/internal/store"
)

func (a *Admin) registerMediaRoutes(mux *http.ServeMux) {
	mux.HandleFunc("GET /admin/media", a.requireLogin(a.handleMediaLibrary))
	mux.HandleFunc("POST /admin/media/{name}/delete", a.requireLogin(a.handleMediaDelete))
}

func (a *Admin) handleMediaLibrary(w http.ResponseWriter, r *http.Request) {
	data := a.pageData(r)
	items := a.deps.Store.ListMedia()
	data.MediaItems = mediaRows(items)
	data.MediaTotal = humanSize(totalSize(items))
	data.Crumbs = []Crumb{{Label: "Media", IsLast: true, UI: true}}
	a.renderPage(w, r, "media.html", data, http.StatusOK)
}

// totalSize sums the byte sizes of the media library.
func totalSize(items []store.Media) int64 {
	var total int64
	for _, item := range items {
		total += item.Size
	}
	return total
}

// humanSize formats a byte count for the library summary: kilobytes
// below a megabyte (rounded up, so nothing reads as zero), megabytes
// above it, empty for an empty library.
func humanSize(total int64) string {
	switch {
	case total <= 0:
		return ""
	case total < 1024*1024:
		kb := (total + 1023) / 1024
		return fmt.Sprintf("%d kB", kb)
	default:
		return fmt.Sprintf("%.1f MB", float64(total)/(1024*1024))
	}
}

func (a *Admin) handleMediaDelete(w http.ResponseWriter, r *http.Request) {
	if !a.requireCSRF(w, r) {
		return
	}
	name := r.PathValue("name")
	if !a.deps.Store.DeleteMedia("/media/" + strings.TrimPrefix(name, "/")) {
		http.Error(w, "File not found", http.StatusNotFound)
		return
	}
	a.record(r, "media.deleted", fmt.Sprintf("/media/%s", name), nil)
	http.Redirect(w, r, "/admin/media", http.StatusSeeOther)
}