name: Update README version

on:
  push:
    branches:
      - master
  schedule:
    - cron: "17 2 * * *"
  workflow_dispatch:

permissions:
  contents: write

jobs:
  update-readme-version:
    runs-on: ubuntu-latest
    env:
      COPR_WEBHOOK_URL: ${{ secrets.COPR_WEBHOOK_URL }}
      TARBALL_URL_AARCH64: https://packages.element.io/desktop/install/linux/glibc-aarch64/element-desktop.tar.gz
      TARBALL_URL_X86_64: https://packages.element.io/desktop/install/linux/glibc-x86-64/element-desktop.tar.gz
    steps:
      - name: Check out repository
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITEA_TOKEN }}
          fetch-depth: 0
          ref: ${{ gitea.ref_name }}

      - name: Detect latest upstream version
        id: version
        shell: bash
        run: |
          set -euo pipefail

          topdir_x86_64="$(curl -fsSL "$TARBALL_URL_X86_64" | tar -tzf - | sed -n '1s#/##p')"
          topdir_aarch64="$(curl -fsSL "$TARBALL_URL_AARCH64" | tar -tzf - | sed -n '1s#/##p')"

          latest_version_x86_64="${topdir_x86_64#element-desktop-}"
          latest_version_aarch64="${topdir_aarch64#element-desktop-}"
          latest_version_aarch64="${latest_version_aarch64%-arm64}"
          current_version="$(sed -n 's/^Latest upstream version tracked in this repo: `\([^`]*\)`$/\1/p' README.md)"

          if [ -z "$latest_version_x86_64" ] || [ "$latest_version_x86_64" = "$topdir_x86_64" ]; then
            echo "Failed to derive upstream x86_64 version from tarball root: $topdir_x86_64" >&2
            exit 1
          fi

          if [ -z "$latest_version_aarch64" ] || [ "$latest_version_aarch64" = "$topdir_aarch64" ]; then
            echo "Failed to derive upstream aarch64 version from tarball root: $topdir_aarch64" >&2
            exit 1
          fi

          if [ -z "$current_version" ]; then
            echo "Could not find tracked version marker in README.md" >&2
            exit 1
          fi

          if [ "$latest_version_x86_64" != "$latest_version_aarch64" ]; then
            echo "Upstream version mismatch: x86_64=$latest_version_x86_64 aarch64=$latest_version_aarch64" >&2
            exit 1
          fi

          echo "latest=$latest_version_x86_64" >> "$GITHUB_OUTPUT"
          echo "current=$current_version" >> "$GITHUB_OUTPUT"

      - name: Update README
        if: steps.version.outputs.latest != steps.version.outputs.current
        shell: bash
        run: |
          set -euo pipefail

          sed -i \
            "s/^Latest upstream version tracked in this repo: .*/Latest upstream version tracked in this repo: \`${{ steps.version.outputs.latest }}\`/" \
            README.md

      - name: Commit and push update
        id: commit
        if: steps.version.outputs.latest != steps.version.outputs.current
        shell: bash
        run: |
          set -euo pipefail

          git config user.name "Gitea Actions"
          git config user.email "actions@localhost"
          git add README.md
          git commit -m "docs: update tracked Element Desktop version to ${{ steps.version.outputs.latest }}"
          git push
          echo "pushed=true" >> "$GITHUB_OUTPUT"

      - name: Trigger COPR build
        if: gitea.event_name == 'push' && steps.commit.outputs.pushed != 'true'
        shell: bash
        run: |
          set -euo pipefail

          if [ -z "${COPR_WEBHOOK_URL:-}" ]; then
            echo "COPR_WEBHOOK_URL secret is not set" >&2
            exit 1
          fi

          curl --fail --show-error --silent \
            --retry 3 \
            --retry-all-errors \
            -X POST \
            "$COPR_WEBHOOK_URL"