{{- /*
    Renders a post's locations on a map.

    @params pc Page context.
    @params locations_data Site data of locations.
    @params locations   Post locations.
    */
-}}

<!-- Validation -->

{{- if ( not ( isset . "pc" ) ) -}}
    {{- errorf "No page context passed" -}}
{{- end -}}

{{- if ( not ( isset . "locations_data" ) ) -}}
    {{- errorf "No location site data defined" -}}
{{- end -}}

{{- if ( not ( isset . "locations" ) ) -}}
    {{- errorf "No post locations defined" -}}
{{- end -}}

<!-- Rendering -->

var map = L.map('map').setView([55, -3], 13);

L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    maxZoom: 19,
    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>'
}).addTo(map);

var latLons = [];
{{ $locations_leaf_nodes := partialCached "util/get_location_leaf_nodes.html" .locations_data -}}
{{- range .locations -}}
    {{- with ( index $locations_leaf_nodes ( replaceRE `, [A-Z]+` "" . ) ) -}}
        L.marker([{{ .lat }}, {{ .lon }}]).addTo(map);
        latLons.push([{{ .lat }}, {{ .lon }}]);
    {{- else -}}
        {{- erroridf "missing-lat-lon" "Could not find lat-lon for %q" . -}}
    {{- end -}}
{{- end }}

map.fitBounds(latLons);