# Install HTTPS cert Let's Encrypt for 3 SOLUTION_ERP domains via win-acme (WACS).
# Run on VPS Windows Server with admin privilege.
# Idempotent: re-run skips cert still valid.
#
# Usage:
#   .\setup-ssl.ps1
#
# Prereq:
#   - IIS sites created (run setup-iis-sites.ps1 first)
#   - Port 80 from Internet -> VPS open (Let's Encrypt HTTP-01 challenge)
#   - 3 domains api/admin/eoffice.solutions.com.vn pointing DNS to VPS IP
#
# Output:
#   - 3 cert in Windows Cert Store (LocalMachine\My)
#   - HTTPS binding port 443 for 3 sites
#   - Scheduled task auto-renew (90 day cycle Let's Encrypt, win-acme auto renew when 30 days left)

$ErrorActionPreference = 'Stop'

$WacsDir = "C:\Program Files\win-acme"
$WacsExe = Join-Path $WacsDir "wacs.exe"

# ===================== 1. Download + install win-acme =====================
if (-not (Test-Path $WacsExe)) {
    Write-Host "==> Download win-acme (WACS)..." -ForegroundColor Cyan
    $url = "https://github.com/win-acme/win-acme/releases/download/v2.2.9.1701/win-acme.v2.2.9.1701.x64.trimmed.zip"
    $zip = "$env:TEMP\wacs.zip"
    Invoke-WebRequest -Uri $url -OutFile $zip -UseBasicParsing
    if (-not (Test-Path $WacsDir)) { New-Item -ItemType Directory -Force -Path $WacsDir | Out-Null }
    Expand-Archive -Path $zip -DestinationPath $WacsDir -Force
    Remove-Item $zip
    Write-Host "  Installed to $WacsDir"
} else {
    Write-Host "==> win-acme already installed at $WacsDir"
}

# ===================== 2. Check IIS sites exist =====================
Import-Module WebAdministration
$domains = @(
    @{ Site = "SolutionErp-Api";   HostName = "api.solutions.com.vn"   },
    @{ Site = "SolutionErp-Admin"; HostName = "admin.solutions.com.vn" },
    @{ Site = "SolutionErp-User";  HostName = "eoffice.solutions.com.vn"  }
)

foreach ($d in $domains) {
    if (-not (Test-Path "IIS:\Sites\$($d.Site)")) {
        Write-Error "Site '$($d.Site)' does not exist. Run setup-iis-sites.ps1 first."
        exit 1
    }
}
Write-Host "  3 IIS sites ready"

# ===================== 3. Run win-acme per domain =====================
foreach ($d in $domains) {
    Write-Host ""
    Write-Host "==> Issue cert for $($d.HostName)" -ForegroundColor Cyan

    # win-acme CLI non-interactive:
    # --target manual + --host <domain>
    # --siteid         -> IIS site to install on
    # --installation iis -> auto bind HTTPS 443 + http->https redirect
    # --accepttos      -> accept Let's Encrypt terms
    # --emailaddress   -> contact email for expiry alerts
    $siteId = (Get-Website $d.Site).Id
    $wacsArgs = @(
        "--target", "manual",
        "--host", $d.HostName,
        "--store", "certificatestore",
        "--installation", "iis",
        "--installationsiteid", $siteId,
        "--accepttos",
        "--emailaddress", "admin@huypham.vn"
    )

    & $WacsExe @wacsArgs
    if ($LASTEXITCODE -ne 0) {
        Write-Warning "Issue cert for $($d.HostName) FAIL exit $LASTEXITCODE - check:"
        Write-Warning "  1. Port 80 Internet -> VPS open (Let's Encrypt reach via HTTP-01)?"
        Write-Warning "  2. DNS $($d.HostName) -> $((Resolve-DnsName $d.HostName -Type A -ErrorAction SilentlyContinue).IPAddress)?"
        Write-Warning "  3. IIS site $($d.Site) binding port 80 with host header $($d.HostName)?"
    } else {
        Write-Host "  [OK] Cert installed"
    }
}

# ===================== 4. HTTP -> HTTPS redirect =====================
Write-Host ""
Write-Host "==> HTTP -> HTTPS redirect (win-acme auto-adds via --installation iis)" -ForegroundColor Cyan
Write-Host "  (skip manual rule - win-acme handled it)"

# ===================== 5. Verify scheduled task =====================
Write-Host ""
Write-Host "==> Verify scheduled task auto-renew"
$task = Get-ScheduledTask -TaskName "win-acme renew (acme-v02.api.letsencrypt.org)" -ErrorAction SilentlyContinue
if ($task) {
    Write-Host "  [OK] Task '$($task.TaskName)' exists - auto renew 9h daily"
} else {
    Write-Warning "  Task not created - run manually: $WacsExe --renew --baseuri https://acme-v02.api.letsencrypt.org/"
}

Write-Host ""
Write-Host "[OK] SSL setup DONE" -ForegroundColor Green
Write-Host "   Test: openssl s_client -connect api.solutions.com.vn:443 < /dev/null | openssl x509 -noout -subject -dates"
Write-Host "   Or browser: https://api.solutions.com.vn/health/live"
