{{/*

  This template is used to render the set of changes in the changelog page.

  If this version of the spec is unstable, it expects to find a
  "changelog/newsfragments" directory containing all unreleased changes,
  and renders them all.

  Otherwise it expects to find a "changelog/releases" directory, under which
  is one or more directories whose name is a patch number, like "0", "1", and so on.

  It renders each of these subdirectories as a separate patch, including
  a table containing basic info about that patch and the set of changes in it.

*/}}

{{ $path := path.Join "changelogs" }}

{{ $status := .Site.Params.version.status }}

{{ if eq $status "unstable" }}
<h2 id=api-changes>Changes since last release</h2>
    {{ partial "render-api-changes" (dict "title" "Client-Server API" "id" "client-server-api" "path" (path.Join $path "client_server")) }}
    {{ partial "render-api-changes" (dict "title" "Server-Server API" "id" "server-server-api" "path" (path.Join $path "server_server")) }}
    {{ partial "render-api-changes" (dict "title" "Application Service API" "id" "application-service-api" "path" (path.Join $path "application_service")) }}
    {{ partial "render-api-changes" (dict "title" "Identity Service API" "id" "identity-service-api" "path" (path.Join $path "identity_service")) }}
    {{ partial "render-api-changes" (dict "title" "Push Gateway API" "id" "push-gateway-api" "path" (path.Join $path "push_gateway")) }}
{{ else }}
    {{ $releases_path := path.Join $path "releases" }}
    {{ $major_version := .Site.Params.version.major_version }}
    {{ $minor_version := .Site.Params.version.minor_version }}
    {{ $releases := partial "reverse-slice" (readDir $releases_path) }}
    {{ range $releases }}
        {{ if .IsDir }}
<h2 id="{{ .Name }}">Version {{ $major_version }}.{{ $minor_version }}.{{ .Name }}</h2>
        {{ $release_path := path.Join $releases_path .Name}}
        {{ $release_info := readFile (path.Join $release_path "release.yaml") | transform.Unmarshal }}
<table class="release-info">
<tr><th>Git commit</th><td><a href="https://github.com/matrix-org/matrix-doc/tree/{{ $release_info.tag }}">https://github.com/matrix-org/matrix-doc/tree/{{ $release_info.tag }}</a></td>
<tr><th>Release date</th><td>{{ $release_info.date }}</td>
</table>
            {{ partial "render-api-changes" (dict "title" "Client-Server API" "id" "client-server-api" "path" (path.Join $release_path "client_server")) }}
            {{ partial "render-api-changes" (dict "title" "Server-Server API" "id" "server-server-api" "path" (path.Join $release_path "server_server")) }}
            {{ partial "render-api-changes" (dict "title" "Application Service API" "id" "application-service-api" "path" (path.Join $release_path "application_service")) }}
            {{ partial "render-api-changes" (dict "title" "Identity Service API" "id" "identity-service-api" "path" (path.Join $release_path "identity_service")) }}
            {{ partial "render-api-changes" (dict "title" "Push Gateway API" "id" "push-gateway-api" "path" (path.Join $release_path "push_gateway")) }}
        {{ end }}
    {{ end }}
{{ end }}

{{ define "partials/reverse-slice" }}
{{ $sliceOriginal := . }}
{{ $len := len $sliceOriginal }}
{{ $sliceReversed := slice }}
{{ range seq $len }}
    {{ $sliceReversed = $sliceReversed | append (index $sliceOriginal (sub $len .)) }}
{{ end }}
{{ return $sliceReversed }}
{{ end }}

{{ define "partials/render-api-changes" }}
<h3 id="{{.id}}">{{ .title }}</h3>
    {{ $api_path := .path }}
    {{ $config_file := path.Join $api_path "pyproject.toml" }}
    {{ $config := readFile $config_file | transform.Unmarshal }}
    {{ $news_path := path.Join $api_path "newsfragments" }}
    {{ partial "render-newsfragments"  (dict "config" $config "news_path" $news_path )}}
{{ end }}

{{ define "partials/render-newsfragments" }}
{{ $config := .config }}
{{ $news_path := .news_path }}

{{ $types := dict }}
{{ range $config.tool.towncrier.type }}
    {{ $types = merge $types (dict .directory (slice)) }}
{{ end }}

{{ range (readDir $news_path) }}

    {{ $pieces := split .Name "." }}

    {{ $ticket := index $pieces 0 }}
    {{ $description := readFile (path.Join $news_path .Name ) }}
    {{ $change_info := (dict "ticket" $ticket "description" $description )}}

    {{ $type := index $pieces 1 }}
    {{ $instances := index $types $type }}
    {{ $instances = $instances | append $change_info }}
    {{ $types = merge $types (dict $type $instances) }}

{{ end }}

<ul>
{{ range $config.tool.towncrier.type }}
    {{ $changes_of_type := (index $types .directory) }}
    {{ if $changes_of_type }}
<li><strong>{{.name}}</strong>
<p><ul>
        {{ range $changes_of_type }}
<li><a href="https://github.com/matrix-org/matrix-doc/issues/{{.ticket}}"><strong>{{ .ticket }}: </strong></a>{{ .description | markdownify }}</li>
        {{ end }}
</ul></p>
</li>
    {{ end }}
{{ end }}
</ul>
{{ end }}