param(
    [string]$ProjectRoot = $PSScriptRoot
)

$ErrorActionPreference = "Stop"

$appGradle = Join-Path $ProjectRoot "android\app\build.gradle.kts"

if (-not (Test-Path $appGradle)) {
    throw "Introuvable: $appGradle"
}

$backup = "$appGradle.before_hd_kotlin_dsl_fix"

if (-not (Test-Path $backup)) {
    Copy-Item $appGradle $backup
    Write-Host "Backup: $backup"
}

$text = Get-Content $appGradle -Raw

# Avec l'AGP 9 Kotlin intégré, jvmTarget hérite déjà de
# android.compileOptions.targetCompatibility. Notre bloc kotlin {}
# ajouté pour la HD est donc inutile et, sur cette combinaison
# Flutter/Gradle, n'a pas d'accesseur Kotlin DSL disponible.
#
# On retire uniquement le bloc précis que notre correctif précédent
# avait ajouté, qu'il soit au niveau racine ou dans android {}.
$kotlinCompilerBlock = '(?ms)[ \t]*kotlin\s*\{\s*compilerOptions\s*\{\s*jvmTarget\s*=\s*org\.jetbrains\.kotlin\.gradle\.dsl\.JvmTarget\.JVM_17\s*\}\s*\}\s*'

$count = [regex]::Matches(
    $text,
    $kotlinCompilerBlock
).Count

if ($count -gt 0) {
    $text = [regex]::Replace(
        $text,
        $kotlinCompilerBlock,
        ''
    )

    Write-Host "Bloc kotlin/compilerOptions retire ($count occurrence(s))."
} else {
    Write-Host "Aucun bloc kotlin/compilerOptions HD a retirer."
}

# On conserve Java 17 et le desugaring nécessaire à NewPipe.
if (
    $text -notmatch 'isCoreLibraryDesugaringEnabled\s*=\s*true'
) {
    $needle =
        'targetCompatibility = JavaVersion.VERSION_17'

    if (-not $text.Contains($needle)) {
        throw "targetCompatibility Java 17 introuvable dans $appGradle"
    }

    $text = $text.Replace(
        $needle,
        "targetCompatibility = JavaVersion.VERSION_17`r`n        isCoreLibraryDesugaringEnabled = true"
    )

    Write-Host "Core library desugaring active."
}

# Vérifie que les dépendances de l'étape HD existent toujours.
if (
    $text -notmatch 'com\.github\.TeamNewPipe:NewPipeExtractor:v0\.26\.3'
) {
    $dependencyBlock = @'

dependencies {
    implementation("com.github.TeamNewPipe:NewPipeExtractor:v0.26.3")
    implementation("com.squareup.okhttp3:okhttp:4.12.0")
    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs_nio:2.1.5")
}
'@

    $text = $text.TrimEnd() + "`r`n" + $dependencyBlock + "`r`n"
    Write-Host "Dependances HD restaurees."
}

Set-Content -Path $appGradle -Value $text -Encoding UTF8

Write-Host ""
Write-Host "Correctif Kotlin DSL applique."
Write-Host "Le bloc kotlin {} ajoute par l'etape precedente a ete retire."
Write-Host ""
Write-Host "Lance maintenant:"
Write-Host "  flutter clean"
Write-Host "  flutter pub get"
Write-Host "  flutter run -d f10778d8"