{{/*
  Slide Branding Component
  
  Renders persistent branding elements (logo, title overlay, etc.) that appear
  across all slides in a presentation.
  
  Configuration (site.Params.slides.branding or .Params.slides.branding):
    logo:
      src: "media/logo.png"        # Path to logo image
      alt: "Organization Logo"     # Alt text
      position: "top-left"         # top-left, top-right, bottom-left, bottom-right
      width: "100px"               # Logo width
      margin: "20px"               # Distance from edges
    title:
      show: true                   # Show presentation title
      position: "bottom-left"      # Position of title text
    author:
      show: true                   # Show author/presenter name
      position: "bottom-right"     # Position of author text
*/}}

{{/* Merge page-level config with site-level defaults */}}
{{ $site_branding := site.Params.slides.branding | default dict }}
{{ $page_branding := .Params.slides.branding | default dict }}
{{ $branding := merge $site_branding $page_branding }}

{{/* Logo rendering */}}
{{ with $branding.logo }}
  {{ if .filename }}
    {{ $resource_path := printf "media/%s" .filename }}
    {{ $logo_resource := resources.Get $resource_path }}
    {{ with $logo_resource }}
      {{ $position := $branding.logo.position | default "top-left" }}
      {{ $width := $branding.logo.width | default "80px" }}
      {{ $margin := $branding.logo.margin | default "20px" }}
      {{ $alt := $branding.logo.alt | default "Logo" }}
      
      {{/* Calculate CSS position based on position string */}}
      {{ $positionCSS := "" }}
      {{ if eq $position "top-left" }}
        {{ $positionCSS = printf "top: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "top-right" }}
        {{ $positionCSS = printf "top: %s; right: %s;" $margin $margin }}
      {{ else if eq $position "bottom-left" }}
        {{ $positionCSS = printf "bottom: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "bottom-right" }}
        {{ $positionCSS = printf "bottom: %s; right: %s;" $margin $margin }}
      {{ else }}
        {{/* Custom position - expect CSS string */}}
        {{ $positionCSS = $position }}
      {{ end }}
      
      <div id="slide-logo" style="{{ $positionCSS | safeCSS }} width: {{ $width }};" aria-label="{{ $alt }}">
        {{/* Inline SVGs to enable currentColor, use img for other formats */}}
        {{ if strings.HasSuffix .Name ".svg" }}
          {{ .Content | safeHTML }}
        {{ else }}
          <img src="{{ .RelPermalink }}" alt="{{ $alt }}">
        {{ end }}
      </div>
    {{ end }}
  {{ end }}
{{ end }}

{{/* Title overlay (optional) */}}
{{ if $branding.title }}
  {{ with $branding.title }}
    {{ if .show }}
      {{ $position := .position | default "bottom-left" }}
      {{ $margin := .margin | default "20px" }}
      
      {{ $positionCSS := "" }}
      {{ if eq $position "top-left" }}
        {{ $positionCSS = printf "top: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "top-right" }}
        {{ $positionCSS = printf "top: %s; right: %s;" $margin $margin }}
      {{ else if eq $position "bottom-left" }}
        {{ $positionCSS = printf "bottom: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "bottom-right" }}
        {{ $positionCSS = printf "bottom: %s; right: %s;" $margin $margin }}
      {{ end }}
      
      <div id="slide-title-overlay" style="{{ $positionCSS | safeCSS }}">
        {{ .text | default $.Title }}
      </div>
    {{ end }}
  {{ end }}
{{ end }}

{{/* Author overlay (optional) */}}
{{ if $branding.author }}
  {{ with $branding.author }}
    {{ if .show }}
      {{ $position := .position | default "bottom-right" }}
      {{ $margin := .margin | default "20px" }}
      
      {{ $positionCSS := "" }}
      {{ if eq $position "top-left" }}
        {{ $positionCSS = printf "top: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "top-right" }}
        {{ $positionCSS = printf "top: %s; right: %s;" $margin $margin }}
      {{ else if eq $position "bottom-left" }}
        {{ $positionCSS = printf "bottom: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "bottom-right" }}
        {{ $positionCSS = printf "bottom: %s; right: %s;" $margin $margin }}
      {{ end }}
      
      {{/* Get author from page params or first author */}}
      {{ $author := "" }}
      {{ with $.Params.authors }}
        {{ if reflect.IsSlice . }}
          {{ $author = index . 0 }}
        {{ else }}
          {{ $author = . }}
        {{ end }}
      {{ end }}
      {{ with $.Params.author }}
        {{ $author = . }}
      {{ end }}
      
      {{ if $author }}
      <div id="slide-author-overlay" style="{{ $positionCSS | safeCSS }}">
        {{ $author }}
      </div>
      {{ end }}
    {{ end }}
  {{ end }}
{{ end }}

{{/* Footer text overlay (optional) - e.g. for copyright */}}
{{ if $branding.footer }}
  {{ with $branding.footer }}
    {{ if .text }}
      {{ $position := .position | default "bottom-center" }}
      {{ $margin := .margin | default "20px" }}
      
      {{ $positionCSS := "" }}
      {{ if eq $position "top-left" }}
        {{ $positionCSS = printf "top: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "top-right" }}
        {{ $positionCSS = printf "top: %s; right: %s;" $margin $margin }}
      {{ else if eq $position "bottom-left" }}
        {{ $positionCSS = printf "bottom: %s; left: %s;" $margin $margin }}
      {{ else if eq $position "bottom-right" }}
        {{ $positionCSS = printf "bottom: %s; right: %s;" $margin $margin }}
      {{ else if eq $position "bottom-center" }}
        {{ $positionCSS = printf "bottom: %s; left: 50%%; transform: translateX(-50%%);" $margin }}
      {{ end }}
      
      <div id="slide-footer-text-overlay" style="{{ $positionCSS | safeCSS }}">
        {{ .text | markdownify }}
      </div>
    {{ end }}
  {{ end }}
{{ end }}