# ffmpeg/ffprobe 사이드카 다운로드 (BtbN FFmpeg-Builds, LGPL 정적 빌드)
# 사용: .\scripts\fetch-ffmpeg.ps1 [-Target win64|winarm64]
# 결과: src-tauri\binaries\ffmpeg-<triple>.exe, ffprobe-<triple>.exe + manifest
param(
    [ValidateSet("win64", "winarm64")]
    [string]$Target = "win64"
)

$ErrorActionPreference = "Stop"
$repo = "BtbN/FFmpeg-Builds"
$triple = if ($Target -eq "win64") { "x86_64-pc-windows-msvc" } else { "aarch64-pc-windows-msvc" }
$root = Split-Path $PSScriptRoot -Parent
$binDir = Join-Path $root "src-tauri\binaries"
New-Item -ItemType Directory -Force $binDir | Out-Null

if ((Test-Path "$binDir\ffmpeg-$triple.exe") -and (Test-Path "$binDir\ffprobe-$triple.exe")) {
    Write-Host "[fetch-ffmpeg] 이미 존재: $triple — 건너뜀 (강제 갱신은 파일 삭제 후 재실행)"
    exit 0
}

Write-Host "[fetch-ffmpeg] BtbN 'latest' 릴리스 자산 조회..."
$release = Invoke-RestMethod "https://api.github.com/repos/$repo/releases/tags/latest" -Headers @{ "User-Agent" = "archive-build" }

# 버전 브랜치(nX.Y) LGPL 정적 zip 우선, 없으면 master
$pattern = "^ffmpeg-n[\d\.]+-latest-$Target-lgpl-[\d\.]+\.zip$"
$asset = $release.assets | Where-Object { $_.name -match $pattern } | Sort-Object name -Descending | Select-Object -First 1
if (-not $asset) {
    $asset = $release.assets | Where-Object { $_.name -eq "ffmpeg-master-latest-$Target-lgpl.zip" } | Select-Object -First 1
}
if (-not $asset) { throw "LGPL $Target 자산을 찾을 수 없습니다" }

Write-Host "[fetch-ffmpeg] 다운로드: $($asset.name) ($([math]::Round($asset.size / 1MB, 1)) MB)"
$tmp = Join-Path $env:TEMP "ffmpeg-fetch"
New-Item -ItemType Directory -Force $tmp | Out-Null
$zipPath = Join-Path $tmp $asset.name
Invoke-WebRequest $asset.browser_download_url -OutFile $zipPath -UseBasicParsing

$sha256 = (Get-FileHash $zipPath -Algorithm SHA256).Hash
Write-Host "[fetch-ffmpeg] SHA256: $sha256"

$extract = Join-Path $tmp "extract"
Remove-Item -Recurse -Force $extract -ErrorAction SilentlyContinue
Expand-Archive $zipPath -DestinationPath $extract

$ffmpeg = Get-ChildItem $extract -Recurse -Filter "ffmpeg.exe" | Select-Object -First 1
$ffprobe = Get-ChildItem $extract -Recurse -Filter "ffprobe.exe" | Select-Object -First 1
if (-not $ffmpeg -or -not $ffprobe) { throw "zip 안에서 ffmpeg/ffprobe.exe를 찾지 못함" }

Copy-Item $ffmpeg.FullName "$binDir\ffmpeg-$triple.exe" -Force
Copy-Item $ffprobe.FullName "$binDir\ffprobe-$triple.exe" -Force

@{
    asset   = $asset.name
    sha256  = $sha256
    target  = $Target
    triple  = $triple
    fetched = (Get-Date).ToString("o")
} | ConvertTo-Json | Set-Content "$binDir\manifest-$Target.json" -Encoding utf8

Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue
Write-Host "[fetch-ffmpeg] 완료: $binDir\ffmpeg-$triple.exe"