name: libmpv (Windows)
description: >
  Provide libmpv's Windows development files. `libmpv2-sys` emits
  `cargo:rustc-link-lib=mpv`, and mpv's Windows *player* build ships neither
  mpv.lib nor libmpv-2.dll — they come from the separate mpv-dev archive. Sets
  LIB for the linker, PATH so binaries find the DLL at run time, and
  MPV_DEV_DIR for `scripts/build.ps1`.

outputs:
  dir:
    description: Directory holding libmpv-2.dll and mpv.lib.
    value: ${{ steps.mpv.outputs.dir }}

runs:
  using: composite
  steps:
    # lib.exe, for turning mpv.def into an import library.
    - uses: ilammy/msvc-dev-cmd@v1

    - id: mpv
      shell: pwsh
      run: |
        $ErrorActionPreference = 'Stop'
        $feed = [xml](Invoke-WebRequest -UseBasicParsing `
          'https://sourceforge.net/projects/mpv-player-windows/rss?path=/libmpv').Content
        # The "v3" variants are x86-64-v3 builds; take the baseline one.
        $item = $feed.rss.channel.item |
          Where-Object { $_.link -match 'mpv-dev-x86_64-2[^/]*\.7z/download$' } |
          Select-Object -First 1
        if (-not $item) { throw 'no mpv-dev build in the SourceForge feed' }

        $archive = Join-Path $env:RUNNER_TEMP 'mpv-dev.7z'
        $dir = Join-Path $env:RUNNER_TEMP 'mpv-dev'
        Invoke-WebRequest -UseBasicParsing $item.link -OutFile $archive
        7z x $archive "-o$dir" -y | Out-Null

        $dll = Get-ChildItem -Path $dir -Filter 'libmpv-2.dll' -Recurse |
          Select-Object -First 1
        if (-not $dll) { throw "libmpv-2.dll not found under $dir" }
        $libDir = $dll.Directory.FullName

        # /NAME matters: without it the import library references mpv.dll, and
        # the file that actually ships is libmpv-2.dll.
        lib.exe /def:"$libDir\mpv.def" /name:libmpv-2.dll `
                /out:"$libDir\mpv.lib" /machine:x64 | Out-Null
        if ($LASTEXITCODE -ne 0) { throw 'lib.exe failed to build mpv.lib' }

        "dir=$libDir"        | Out-File $env:GITHUB_OUTPUT -Append -Encoding utf8
        "MPV_DEV_DIR=$libDir" | Out-File $env:GITHUB_ENV   -Append -Encoding utf8
        "LIB=$libDir;$env:LIB" | Out-File $env:GITHUB_ENV  -Append -Encoding utf8
        $libDir              | Out-File $env:GITHUB_PATH   -Append -Encoding utf8