name: Telegram publish release files

# Posts every release artifact (Android APKs, Windows ZIP, macOS, Linux,
# OpenWRT, Raspbian) to the Telegram channel as individual messages with
# Persian captions and a #v<MAJOR><MINOR><PATCH> hashtag. Files larger
# than the bot API's 50 MB ceiling are split into ~45 MB byte chunks
# server-side and posted as `<name>.part_aa`, `.part_ab`, ... — recipients
# reassemble with `cat <name>.part_* > <name>`.
#
# This workflow is decoupled from `release.yml` so it can be re-triggered
# for any historical tag (e.g. to re-post v1.8.0 after a Telegram channel
# wipe) without rebuilding artifacts. It downloads from the GitHub Release
# page directly via `gh release download`, so the assets must already
# exist there.

on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Release tag to publish (with or without the v prefix, e.g. 1.8.0 or v1.8.0)'
        required: true
        type: string
  # Auto-trigger after a successful `release` workflow run. Posts files
  # to Telegram once the release page exists. The `head_branch` of the
  # triggering run is the tag name (e.g. `v1.8.0`) on tag-pushed releases,
  # which is what we feed `gh release download`.
  workflow_run:
    workflows: [release]
    types: [completed]

permissions:
  contents: read

jobs:
  publish:
    # Skip when triggered by a `release` run that didn't succeed — no
    # point posting half a release. Manual `workflow_dispatch` always
    # runs (the user explicitly asked for it).
    if: |
      github.event_name == 'workflow_dispatch'
      || github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          # Sparse checkout would be nicer but stock checkout is fast
          # enough for a 5 MB workflow file + ~200 KB script.
          fetch-depth: 1

      - name: Resolve version + hashtag
        id: ver
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          if [ -n "${{ inputs.version || '' }}" ]; then
            VER="${{ inputs.version }}"
          else
            # workflow_run path. `head_branch` for a tag-pushed release
            # workflow is the tag name (e.g. `v1.8.0`).
            VER="${{ github.event.workflow_run.head_branch || '' }}"
          fi
          if [ -z "$VER" ]; then
            echo "::error::could not determine version from inputs or workflow_run trigger"
            exit 1
          fi
          # Strip the leading `v` if present.
          VER="${VER#v}"
          # Hashtag: `#v` + version with dots removed. So 1.8.0 → #v180,
          # 1.8.10 → #v1810, 2.0.0 → #v200. Predictable across releases.
          HASHTAG="#v$(echo "$VER" | tr -d '.')"
          echo "version=$VER" >> "$GITHUB_OUTPUT"
          echo "hashtag=$HASHTAG" >> "$GITHUB_OUTPUT"
          echo "Resolved: version=$VER  hashtag=$HASHTAG"

      - name: Download release assets
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          mkdir -p assets
          # Mirror the retry pattern from `release.yml`'s download step —
          # GitHub's release-asset CDN occasionally times out on cold
          # tags. Three attempts with 30 s backoff covers most flakes.
          for attempt in 1 2 3; do
            if gh release download "v${{ steps.ver.outputs.version }}" \
                 --dir assets \
                 --repo "${GITHUB_REPOSITORY}"; then
              echo "downloaded release assets on attempt $attempt"
              ls -la assets/
              exit 0
            fi
            echo "attempt $attempt failed; retrying in 30s..."
            sleep 30
          done
          echo "::error::failed to download release assets after 3 attempts"
          exit 1

      - name: Publish files to Telegram channel
        env:
          BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
          # The files channel — supergroup-style negative ID, hard-coded
          # rather than templated as a repo variable because there's only
          # ever one of these and putting it in source makes the workflow
          # auditable. The bot token already has post permissions there.
          CHAT_ID: '-1003966234444'
          # The main announcement channel. Receives a single cross-link
          # message per release pointing at the file-channel anchor post,
          # instead of the previous behaviour of attaching the universal
          # APK + full changelog. Sourced from the same secret the
          # legacy `telegram` job in release.yml used.
          MAIN_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
          # Public-username form of the files channel link. Used for
          # both (a) the post-link in the main-channel cross-post — so
          # `t.me/<name>/<msg>` works for everyone, not just members
          # via `t.me/c/<id>/<msg>` — and (b) one of the two
          # channel-join links rendered at the bottom of the cross-post.
          # Defaults to `mhrv_rs` (current public username); override via
          # repo variable if the channel is renamed.
          FILES_CHANNEL_USERNAME: ${{ vars.FILES_CHANNEL_USERNAME || 'mhrv_rs' }}
          # `t.me/+<hash>` invite link for the files channel. Rendered
          # as the second channel-join option in the main-channel
          # cross-post — the only join path that works for users coming
          # from outside Telegram search (private/restricted channels)
          # or whose Telegram client doesn't resolve usernames cleanly.
          # Override via repo variable if the channel's invite hash is
          # rotated.
          FILES_CHANNEL_INVITE: ${{ vars.FILES_CHANNEL_INVITE || 'https://t.me/+R1OyoHX2boA1ZDgx' }}
        run: |
          if [ -z "${BOT_TOKEN:-}" ]; then
            echo "::error::TELEGRAM_BOT_TOKEN not set; can't publish"
            exit 1
          fi
          python3 .github/scripts/telegram_publish_files.py \
            --assets-dir assets \
            --version "${{ steps.ver.outputs.version }}" \
            --hashtag "${{ steps.ver.outputs.hashtag }}"