{{/* Parameter Parsing */}}
{{ $usage := `lazyimg:
    Usage like:
    - {{ partial "lazyimg" "image.jpg" }}
    - {{ partial "lazyimg" (resources.Get "image.jpg") }}

    ...or more verbose by specifying a dict overriding the site.Params.lazyimg, e.g.:
    - {{ partial "lazyimg" (dict "resizer" "auto" "renderer" "lqip") }}
    - {{ partial "lazyimg" (dict "img" "image.jpg" "responsiveSizes" (slice "320px" "640px") "resizer" "responsive") }}

    Please ensure that image exists in ./assets directory.
` }}

{{ $params := merge site.Params.lazyimg (dict 
    "img" . 
    "resizer" (default "responsive" site.Params.lazyimg.resizer) 
    "renderer" (default "lqip" site.Params.lazyimg.renderer)
)}}
{{ if reflect.IsMap . }}
    {{ $params = merge $params . }}
{{ end }}
{{ $resType := (printf "%T" $params.img) }}
{{ if not (in $resType "resource") }}
    {{ $params = merge $params (dict "img" (resources.Get $params.img)) }}
{{ end }}
{{ if not $params.img }}
    {{ errorf "image path ./assets/%s does not exist" $params.img }}
    {{ warnf $usage }}
{{ end }}

{{ $sizes := partial (printf "resizer/%s" $params.resizer) $params }}
{{ return (partial (printf "renderer/%s" $params.renderer) (merge (dict "imgDict" $sizes) $params)) }}