# Multica fork CLI — Windows installer
#
# Installs the fork-built `multica.exe` CLI (with agent-arka runtime support,
# Arka SSO, Russian i18n) from arka/public releases.
#
#   irm https://git.arka-ai.ru/arka/public/raw/branch/main/multica/install.ps1 | iex
#
# Environment:
#   $env:MULTICA_VERSION   pin a release (e.g. 0.6.1-arka). Default: newest multica-v* on git.arka-ai.ru/arka/public

$ErrorActionPreference = "Stop"

$PublicApi    = if ($env:MULTICA_PUBLIC_API) { $env:MULTICA_PUBLIC_API } else { "https://git.arka-ai.ru/api/v1" }
$PublicDl     = if ($env:MULTICA_PUBLIC_DL) { $env:MULTICA_PUBLIC_DL } else { "https://git.arka-ai.ru/arka/public/releases/download" }
$Repo         = "arka/public"
$TagPrefix    = "multica-v"

$BinDir = Join-Path $env:USERPROFILE ".multica\bin"

function Write-Info { Write-Host "==> $args" -ForegroundColor Cyan }
function Write-Ok   { Write-Host "OK $args" -ForegroundColor Green }
function Write-Warn { Write-Host "WARN $args" -ForegroundColor Yellow }
function Write-Fail { Write-Host "FAIL $args" -ForegroundColor Red; exit 1 }

function Get-WindowsCliArch {
    $arch = $env:PROCESSOR_ARCHITECTURE
    if ($arch -eq "AMD64" -or $arch -eq "x86_64") { return "amd64" }
    if ($arch -eq "ARM64") { return "arm64" }
    Write-Fail "Unsupported architecture: $arch"
}

function Get-LatestMulticaVersion {
    $url = "$PublicApi/repos/$Repo/releases?limit=50"
    try {
        $releases = Invoke-RestMethod -Uri $url -UseBasicParsing -ErrorAction Stop
    } catch {
        Write-Fail "Cannot list releases at $url : $_"
    }
    $tags = $releases | Where-Object { $_.tag_name -like "$TagPrefix*" } | ForEach-Object { $_.tag_name }
    if (-not $tags) { Write-Fail "No ${TagPrefix}* releases on $Repo yet" }
    $latest = $tags | Sort-Object -Descending | Select-Object -First 1
    return $latest.Substring($TagPrefix.Length)
}

function Add-ToUserPath {
    param([string]$Dir)
    $currentPath = [Environment]::GetEnvironmentVariable("Path", "User")
    if ($currentPath -and $currentPath.Split(";") -contains $Dir) { return }
    $newPath = if ($currentPath) { "$currentPath;$Dir" } else { $Dir }
    [Environment]::SetEnvironmentVariable("Path", $newPath, "User")
    if ($env:Path -notlike "*$Dir*") {
        $env:Path = "$Dir;$env:Path"
    }
    Write-Ok "Added $Dir to user PATH"
}

if (-not [Environment]::Is64BitOperatingSystem) {
    Write-Fail "Multica requires a 64-bit Windows installation."
}

$arch = Get-WindowsCliArch

$version = if ($env:MULTICA_VERSION) { $env:MULTICA_VERSION.TrimStart("v").TrimStart($TagPrefix) } else { Get-LatestMulticaVersion }
Write-Info "Installing Multica fork CLI ${version} (windows-$arch)..."

$asset = "multica-cli-$version-windows-$arch.zip"
$url   = "$PublicDl/$TagPrefix$version/$asset"
$tmpDir = Join-Path ([System.IO.Path]::GetTempPath()) "multica-install"

if (Test-Path $tmpDir) { Remove-Item $tmpDir -Recurse -Force }
New-Item -ItemType Directory -Path $tmpDir | Out-Null

Write-Info "Downloading $url ..."
try {
    Invoke-WebRequest -Uri $url -OutFile (Join-Path $tmpDir "multica.zip") -UseBasicParsing
} catch {
    Remove-Item $tmpDir -Recurse -Force
    Write-Fail "Failed to download CLI binary: $_"
}

# Verify SHA256 checksum
$checksumUrl = "$PublicDl/$TagPrefix$version/checksums.txt"
try {
    $checksums = Invoke-WebRequest -Uri $checksumUrl -UseBasicParsing -ErrorAction Stop
    $checksumContent = if ($checksums.Content -is [byte[]]) {
        [System.Text.Encoding]::UTF8.GetString($checksums.Content)
    } else {
        [string]$checksums.Content
    }
    $zipFile = Join-Path $tmpDir "multica.zip"
    $actualHash = (Get-FileHash -Path $zipFile -Algorithm SHA256).Hash.ToLower()
    $expectedLine = ($checksumContent -split "`r?`n") | Where-Object { $_ -match [regex]::Escape($asset) } | Select-Object -First 1
    if ($expectedLine) {
        $expectedHash = ($expectedLine -split "\s+")[0].ToLower()
        if ($actualHash -ne $expectedHash) {
            Remove-Item $tmpDir -Recurse -Force
            Write-Fail "Checksum verification failed. Expected: $expectedHash, Got: $actualHash"
        }
        Write-Ok "Checksum verified"
    } else {
        Write-Warn "Could not find checksum entry for $asset - skipping verification."
    }
} catch {
    Write-Warn "Could not download checksums.txt - skipping verification."
}

Expand-Archive -Path (Join-Path $tmpDir "multica.zip") -DestinationPath $tmpDir -Force

if (-not (Test-Path $BinDir)) {
    New-Item -ItemType Directory -Path $BinDir -Force | Out-Null
}

$exeSrc = Join-Path $tmpDir "multica.exe"
if (-not (Test-Path $exeSrc)) {
    $exeSrc = Get-ChildItem -Path $tmpDir -Filter "multica.exe" -Recurse | Select-Object -First 1 -ExpandProperty FullName
}
if (-not $exeSrc -or -not (Test-Path $exeSrc)) {
    Remove-Item $tmpDir -Recurse -Force
    Write-Fail "multica.exe not found in downloaded archive."
}

Copy-Item $exeSrc (Join-Path $BinDir "multica.exe") -Force
Remove-Item $tmpDir -Recurse -Force

Add-ToUserPath $BinDir
Write-Ok "Multica CLI installed to $BinDir\multica.exe"

Write-Host ""
Write-Host "  Next — connect to your Multica server:"
Write-Host "    multica setup self-host"
Write-Host "  Or for this instance:"
Write-Host "    multica setup self-host --server-url https://plan.arka-ai.ru --app-url https://plan.arka-ai.ru"
Write-Host ""