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_agp9_fix"

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

$text = Get-Content $appGradle -Raw

# Flutter 3.44 / AGP 9 utilise le Kotlin intégré à AGP.
# Le bloc kotlin { compilerOptions { ... } } doit être dans android { ... }.
$topLevelKotlinPattern = '(?ms)^[ \t]*kotlin\s*\{\s*compilerOptions\s*\{\s*jvmTarget\s*=\s*org\.jetbrains\.kotlin\.gradle\.dsl\.JvmTarget\.JVM_17\s*\}\s*\}\s*'

if ($text -match $topLevelKotlinPattern) {
    $text = [regex]::Replace(
        $text,
        $topLevelKotlinPattern,
        '',
        1
    )

    Write-Host "Bloc kotlin {} invalide retiré du niveau projet."
}

$androidKotlinBlock = @'
        kotlin {
            compilerOptions {
                jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
            }
        }

'@

# Insère le bloc Kotlin juste après compileOptions {} dans android {}.
if (
    $text -notmatch '(?ms)android\s*\{.*?kotlin\s*\{\s*compilerOptions'
) {
    $compileOptionsPattern = '(?ms)([ \t]*compileOptions\s*\{\s*sourceCompatibility\s*=\s*JavaVersion\.VERSION_17\s*targetCompatibility\s*=\s*JavaVersion\.VERSION_17(?:\s*isCoreLibraryDesugaringEnabled\s*=\s*true)?\s*\}\s*)'

    $match = [regex]::Match(
        $text,
        $compileOptionsPattern
    )

    if (-not $match.Success) {
        throw @"
Impossible de trouver compileOptions Java 17 dans:
$appGradle

Envoie-moi ce fichier et je te ferai un correctif exact.
"@
    }

    $replacement =
        $match.Groups[1].Value +
        "`r`n" +
        $androidKotlinBlock

    $text =
        $text.Substring(0, $match.Index) +
        $replacement +
        $text.Substring(
            $match.Index + $match.Length
        )

    Write-Host "Bloc kotlin {} déplacé dans android {}."
}

# NewPipe utilise des API Java qui nécessitent le desugaring sur Android.
if (
    $text -notmatch 'isCoreLibraryDesugaringEnabled\s*=\s*true'
) {
    $text = $text.Replace(
        'targetCompatibility = JavaVersion.VERSION_17',
        "targetCompatibility = JavaVersion.VERSION_17`r`n        isCoreLibraryDesugaringEnabled = true"
    )

    Write-Host "Core library desugaring activé."
}

# Vérifie que les dépendances HD sont toujours présentes.
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 "Dépendances HD restaurées."
}

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

Write-Host ""
Write-Host "Correctif Gradle AGP 9 appliqué."
Write-Host "Fichier: $appGradle"
Write-Host ""
Write-Host "Lance maintenant:"
Write-Host "  flutter clean"
Write-Host "  flutter pub get"
Write-Host "  flutter run -d f10778d8"