$ErrorActionPreference = "Stop"

$head = (& git rev-parse HEAD).Trim()
$shortHead = (& git rev-parse --short HEAD).Trim()
$backendBuild = if (Test-Path "backend/package.json") { "PROJECT_PRESENT_BUILD_NOT_RUN" } else { "SKIPPED_NO_PROJECT" }
$adminBuild = if (Test-Path "admin/package.json") { "PROJECT_PRESENT_BUILD_NOT_RUN" } else { "SKIPPED_NO_PROJECT" }
$migrationFiles = @(Get-ChildItem -Path "database/migrations" -Filter "*.sql" -File -ErrorAction SilentlyContinue)
$databaseMigration = if ($migrationFiles.Count -gt 0) { "PROJECT_PRESENT_MIGRATION_NOT_RUN" } else { "SKIPPED_NO_MIGRATIONS" }

$rawText = @"
{
  "releaseId": "DRYRUN-$shortHead",
  "generatedAt": "WINDOWS_CHECK",
  "commit": "$head",
  "branch": "main",
  "backendBuild": "$backendBuild",
  "adminBuild": "$adminBuild",
  "miniappMirror": "RECORDED_SOURCE_COMMIT_ONLY",
  "databaseMigration": "$databaseMigration",
  "deployed": false
}
"@

$jsonMatch = [regex]::Match($rawText, '(?s)\{.*\}')
if (-not $jsonMatch.Success) {
  throw "release manifest dry-run did not return JSON"
}

$manifest = $jsonMatch.Value | ConvertFrom-Json

if ($manifest.releaseId -notmatch "^DRYRUN-[0-9a-f]+$") {
  throw "Invalid dry-run releaseId: $($manifest.releaseId)"
}

if ($manifest.commit -ne $head) {
  throw "Manifest commit mismatch: manifest=$($manifest.commit) HEAD=$head"
}

if ($manifest.branch -ne "main") {
  throw "Manifest branch must be main, actual: $($manifest.branch)"
}

if ($manifest.deployed -ne $false) {
  throw "Dry-run manifest must not mark deployed=true"
}

if ((Test-Path "backend/package.json") -and $manifest.backendBuild -ne "PROJECT_PRESENT_BUILD_NOT_RUN") {
  throw "Dry-run manifest should record backend project presence"
}
if ((-not (Test-Path "backend/package.json")) -and $manifest.backendBuild -ne "SKIPPED_NO_PROJECT") {
  throw "Dry-run manifest should record missing backend project"
}
if ((Test-Path "admin/package.json") -and $manifest.adminBuild -ne "PROJECT_PRESENT_BUILD_NOT_RUN") {
  throw "Dry-run manifest should record admin project presence"
}
if ((-not (Test-Path "admin/package.json")) -and $manifest.adminBuild -ne "SKIPPED_NO_PROJECT") {
  throw "Dry-run manifest should record missing admin project"
}

if ($manifest.databaseMigration -ne $databaseMigration) {
  throw "Dry-run manifest databaseMigration mismatch: $($manifest.databaseMigration)"
}

Write-Host "PASS: release manifest dry-run is valid for current HEAD."