name: Set up Flutter from git
description: >-
  Clone the pinned Flutter SDK from its release tag and put it on PATH, for
  runners without a published archive. Flutter ships no windows-arm64 SDK, so
  subosito/flutter-action cannot resolve the release for arm64 (no arm64 entry
  in the stable manifest) and `channel: master` would clone master HEAD, whose
  engine is not the patched revision install-patched-engine.ps1 asserts
  (4c525dac). This file is the only place that pin lives: the tag is fetched so
  the SDK reports its own version, then verified against the immutable commit
  and against the version Flutter itself reports, so a moved tag fails the job
  instead of quietly changing SDKs.

runs:
  using: composite
  steps:
    - name: Clone Flutter from its immutable commit
      shell: pwsh
      run: |
        $version = "3.44.0"
        $expectedCommit = "559ffa3f75e7402d65a8def9c28389a9b2e6fe42"
        $root = "$env:RUNNER_TEMP\flutter"
        git init $root
        git -C $root remote add origin https://github.com/flutter/flutter.git
        git -C $root fetch --depth 1 origin "refs/tags/${version}:refs/tags/${version}"
        git -C $root checkout --detach "refs/tags/$version"
        $actualCommit = git -C $root rev-parse HEAD
        if ($LASTEXITCODE -ne 0 -or $actualCommit -ne $expectedCommit) {
          throw "Flutter $version resolved to $actualCommit, expected $expectedCommit"
        }
        "$root\bin" | Out-File -FilePath $env:GITHUB_PATH -Append -Encoding utf8
        & "$root\bin\flutter.bat" --version
        if ($LASTEXITCODE -ne 0) {
          throw "Unable to bootstrap the Flutter SDK"
        }
        $versionOutput = & "$root\bin\flutter.bat" --version --machine
        if ($LASTEXITCODE -ne 0) {
          throw "Unable to resolve the Flutter SDK version"
        }
        $versionJson = $versionOutput -join "`n"
        if ([string]::IsNullOrWhiteSpace($versionJson)) {
          throw "Flutter did not report machine-readable version JSON"
        }
        $reportedVersion = ($versionJson | ConvertFrom-Json).frameworkVersion
        if ($reportedVersion -ne $version) {
          throw "Flutter reported version $reportedVersion, expected $version"
        }