#Requires -Version 5.1
<#
.SYNOPSIS
    Generates a full idempotent EF Core migration SQL script and drops it into Y:\pcc\deployment.

.DESCRIPTION
    Runs `dotnet ef migrations script --idempotent` against the PowderCoating database and writes
    the output to Y:\pcc\deployment\migrations_YYYYMMDD_HHmmss.sql. The script is safe to run on
    any database state: EF wraps each migration in an IF NOT EXISTS check against
    __EFMigrationsHistory, so already-applied migrations are skipped.

.NOTES
    Run from any directory — paths are resolved relative to this script's location.
    Requires: .NET 8 SDK, dotnet-ef tool (dotnet tool install --global dotnet-ef)
#>

[CmdletBinding()]
param (
    [string]$OutputDir = "Y:\pcc\Deployments"
)

$timestamp    = Get-Date -Format "yyyyMMdd_HHmmss"
$displayStamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
$outputFile   = "migrations_$timestamp.sql"

$scriptDir    = Split-Path -Parent $MyInvocation.MyCommand.Path
$repoRoot     = Split-Path -Parent $scriptDir
$webProject   = Join-Path $repoRoot "src\PowderCoating.Web"
$infraProject = Join-Path $repoRoot "src\PowderCoating.Infrastructure"
$outputPath   = Join-Path $OutputDir $outputFile

Write-Host ""
Write-Host "=== EF Migration Script Generator ===" -ForegroundColor Cyan
Write-Host "  Web project : $webProject"
Write-Host "  Output      : $outputPath"
Write-Host ""

# ── Preflight checks ──────────────────────────────────────────────────────────

if (!(Test-Path $webProject)) {
    Write-Host "ERROR: Web project not found at: $webProject" -ForegroundColor Red
    exit 1
}

if (!(Test-Path $OutputDir)) {
    Write-Host "Creating output directory: $OutputDir" -ForegroundColor Yellow
    New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
}

$efVersion = dotnet ef --version 2>$null
if ($LASTEXITCODE -ne 0) {
    Write-Host "ERROR: dotnet-ef tool not found. Install with: dotnet tool install --global dotnet-ef" -ForegroundColor Red
    exit 1
}
Write-Host "dotnet-ef : $($efVersion | Select-Object -First 1)" -ForegroundColor DarkGray

# ── Generate script ───────────────────────────────────────────────────────────

Write-Host "Generating idempotent migration script..." -ForegroundColor Cyan

$savedLocation = Get-Location
Set-Location $webProject

# Capture stderr to a temp file so EF's structured log noise (INF/WRN lines and
# the "Ignoring added logger provider" design-time message) don't trigger
# PowerShell 5.1's NativeCommandError handling.
$tempErr = [System.IO.Path]::GetTempFileName()
try {
    # Temporarily silence $ErrorActionPreference so PS 5.1 doesn't surface EF's
    # design-time stderr lines (structured log noise) as NativeCommandError objects.
    $prevEAP = $ErrorActionPreference
    $ErrorActionPreference = "SilentlyContinue"
    $null = dotnet ef migrations script `
        --idempotent `
        --context ApplicationDbContext `
        --project $infraProject `
        --output $outputPath `
        --no-build 2>$tempErr
    $exitCode = $LASTEXITCODE
    $ErrorActionPreference = $prevEAP

    # Surface any genuine errors — filter out EF's routine log/diagnostic lines
    if (Test-Path $tempErr) {
        Get-Content $tempErr |
            Where-Object {
                $_ -notmatch "^\s*$" -and
                $_ -notmatch "\[.*\]\s+(INF|WRN)" -and
                $_ -notmatch "Ignoring added logger provider" -and
                $_ -notmatch "NativeCommandError"
            } |
            ForEach-Object { Write-Host "  $_" -ForegroundColor DarkYellow }
    }
}
finally {
    Set-Location $savedLocation
    if (Test-Path $tempErr) { Remove-Item $tempErr -Force }
}

if ($exitCode -ne 0) {
    Write-Host "ERROR: dotnet ef migrations script failed (exit code $exitCode)" -ForegroundColor Red
    exit $exitCode
}

if (!(Test-Path $outputPath)) {
    Write-Host "ERROR: Output file was not created: $outputPath" -ForegroundColor Red
    exit 1
}

# ── Stamp header ──────────────────────────────────────────────────────────────

$header = @"
-- =============================================================================
-- Idempotent EF Core migration script
-- Project  : PowderCoating.Web
-- Generated: $displayStamp
-- Safe to run on any database state (checks __EFMigrationsHistory per migration)
-- =============================================================================

"@

$existing = Get-Content $outputPath -Raw
Set-Content -Path $outputPath -Value ($header + $existing) -Encoding UTF8

# ── Report ────────────────────────────────────────────────────────────────────

$size      = [math]::Round((Get-Item $outputPath).Length / 1KB, 1)
$lineCount = (Get-Content $outputPath).Count

Write-Host ""
Write-Host "Done." -ForegroundColor Green
Write-Host "  File    : $outputPath"
Write-Host "  Size    : $size KB  ($lineCount lines)"
Write-Host "  Stamp   : $displayStamp"
Write-Host ""