{{ $default_file_name := .default_file_name }}
{{ $preview_file := .preview_file }}

<!-- 
    Image render priority:  
    
    1. If `preview_file` explicitly set .md file, use it
    2. If custom preview image in `default_file_name` exists, use it
    3. Fall back to default `preview_image`

-->

{{ $preview_image := .context.Params.preview_image }}

{{ $content_dir := or .context.Params.slug .context.File.ContentBaseName }}

{{ $preview_image_path :=  path.Join "static" .context.File.Dir $content_dir "preview" $default_file_name }}
{{ $preview_image_exists := fileExists $preview_image_path }}

{{ if $preview_image_exists }}
    {{ $preview_image_path = strings.TrimPrefix "static/" $preview_image_path }}
    {{ $preview_image_path = strings.TrimPrefix "/static" $preview_image_path }}
    {{ $preview_image = $preview_image_path }}
{{ end }}

{{ if $preview_file }}
    {{ $preview_image = $preview_file }}
{{ end }}

{{ $preview_image = $preview_image  | safeHTML | absURL }}

<img src="{{ $preview_image }}" alt="{{ .context.Params.title }}" loading="lazy">