import com.android.build.gradle.BaseExtension
import com.android.build.gradle.internal.dsl.BaseAppModuleExtension
import com.android.builder.internal.packaging.IncrementalPackager
import com.android.builder.model.SigningConfig
import com.android.tools.build.apkzlib.sign.SigningExtension
import com.android.tools.build.apkzlib.sign.SigningOptions
import com.android.tools.build.apkzlib.zfile.ZFiles
import com.android.tools.build.apkzlib.zip.ZFileOptions
import org.apache.tools.ant.filters.FixCrLfFilter
import org.gradle.api.Action
import org.gradle.api.JavaVersion
import org.gradle.api.Project
import org.gradle.api.plugins.ExtensionAware
import org.gradle.api.tasks.Delete
import org.gradle.api.tasks.StopExecutionException
import org.gradle.api.tasks.Sync
import org.gradle.kotlin.dsl.filter
import org.gradle.kotlin.dsl.named
import org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions
import java.io.ByteArrayInputStream
import java.io.ByteArrayOutputStream
import java.io.File
import java.io.PrintStream
import java.nio.file.Files
import java.security.KeyStore
import java.security.cert.X509Certificate
import java.util.*
import java.util.jar.JarFile
import java.util.zip.*

private fun Project.androidBase(configure: Action<BaseExtension>) =
    extensions.configure("android", configure)

private fun Project.android(configure: Action<BaseAppModuleExtension>) =
    extensions.configure("android", configure)

private fun BaseExtension.kotlinOptions(configure: Action<KotlinJvmOptions>) =
    (this as ExtensionAware).extensions.findByName("kotlinOptions")?.let {
        configure.execute(it as KotlinJvmOptions)
    }

private val Project.android: BaseAppModuleExtension
    get() = extensions.getByName("android") as BaseAppModuleExtension

fun Project.setupCommon() {
    androidBase {
        compileSdkVersion(32)
        buildToolsVersion = "32.0.0"
        ndkPath = "$sdkDirectory/ndk/magisk"

        defaultConfig {
            minSdk = 21
            targetSdk = 32
        }

        compileOptions {
            sourceCompatibility = JavaVersion.VERSION_11
            targetCompatibility = JavaVersion.VERSION_11
        }

        kotlinOptions {
            jvmTarget = "11"
        }
    }
}

private fun SigningConfig.getPrivateKey(): KeyStore.PrivateKeyEntry {
    val keyStore = KeyStore.getInstance(storeType ?: KeyStore.getDefaultType())
    storeFile!!.inputStream().use {
        keyStore.load(it, storePassword!!.toCharArray())
    }
    val keyPwdArray = keyPassword!!.toCharArray()
    val entry = keyStore.getEntry(keyAlias!!, KeyStore.PasswordProtection(keyPwdArray))
    return entry as KeyStore.PrivateKeyEntry
}

private fun addComment(apkPath: File, signConfig: SigningConfig, minSdk: Int, eocdComment: String) {
    val privateKey = signConfig.getPrivateKey()
    val signingOptions = SigningOptions.builder()
        .setMinSdkVersion(minSdk)
        .setV1SigningEnabled(true)
        .setV2SigningEnabled(true)
        .setKey(privateKey.privateKey)
        .setCertificates(privateKey.certificate as X509Certificate)
        .setValidation(SigningOptions.Validation.ASSUME_INVALID)
        .build()
    val options = ZFileOptions().apply {
        noTimestamps = true
        autoSortFiles = true
    }
    ZFiles.apk(apkPath, options).use {
        SigningExtension(signingOptions).register(it)
        it.eocdComment = eocdComment.toByteArray()
        it.get(IncrementalPackager.APP_METADATA_ENTRY_PATH)?.delete()
        it.get(JarFile.MANIFEST_NAME)?.delete()
    }
}

private fun Project.setupAppCommon() {
    setupCommon()

    android {
        signingConfigs {
            create("config") {
                Config["keyStore"]?.also {
                    storeFile = rootProject.file(it)
                    storePassword = Config["keyStorePass"]
                    keyAlias = Config["keyAlias"]
                    keyPassword = Config["keyPass"]
                }
            }
        }

        buildTypes {
            signingConfigs.getByName("config").also {
                getByName("debug") {
                    signingConfig = if (it.storeFile?.exists() == true) it
                    else signingConfigs.getByName("debug")
                }
                getByName("release") {
                    signingConfig = if (it.storeFile?.exists() == true) it
                    else signingConfigs.getByName("debug")
                }
            }
        }

        lint {
            disable += "MissingTranslation"
        }

        dependenciesInfo {
            includeInApk = false
        }
    }

    android.applicationVariants.all {
        val projectName = project.name.toLowerCase(Locale.ROOT)
        val variantCapped = name.capitalize(Locale.ROOT)
        tasks.getByPath(":$projectName:package$variantCapped").doLast {
            val apk = outputs.files.asFileTree.filter { it.name.endsWith(".apk") }.singleFile
            val comment = "version=${Config.version}\nversionCode=${Config.versionCode}"
            addComment(apk, signingConfig, android.defaultConfig.minSdk!!, comment)
        }
    }
}

fun Project.setupApp() {
    setupAppCommon()

    val syncLibs = tasks.register("syncLibs", Sync::class.java) {
        into("src/main/jniLibs")
        into("armeabi-v7a") {
            from(rootProject.file("native/out/armeabi-v7a")) {
                include("busybox", "magiskboot", "magiskinit", "magiskpolicy", "magisk")
                rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
            }
        }
        into("x86") {
            from(rootProject.file("native/out/x86")) {
                include("busybox", "magiskboot", "magiskinit", "magiskpolicy", "magisk")
                rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
            }
        }
        into("arm64-v8a") {
            from(rootProject.file("native/out/arm64-v8a")) {
                include("busybox", "magiskboot", "magiskinit", "magiskpolicy", "magisk")
                rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
            }
        }
        into("x86_64") {
            from(rootProject.file("native/out/x86_64")) {
                include("busybox", "magiskboot", "magiskinit", "magiskpolicy", "magisk")
                rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
            }
        }
        onlyIf {
            if (inputs.sourceFiles.files.size != 20)
                throw StopExecutionException("Please build binaries first! (./build.py binary)")
            true
        }
    }

    val syncAssets = tasks.register("syncAssets", Sync::class.java) {
        dependsOn(syncLibs)
        inputs.property("version", Config.version)
        inputs.property("versionCode", Config.versionCode)
        into("src/main/assets")
        from(rootProject.file("scripts")) {
            include("util_functions.sh", "boot_patch.sh", "addon.d.sh")
            include("uninstaller.sh", "module_installer.sh")
        }
        from(rootProject.file("tools/bootctl"))
        into("chromeos") {
            from(rootProject.file("tools/futility"))
            from(rootProject.file("tools/keys")) {
                include("kernel_data_key.vbprivk", "kernel.keyblock")
            }
        }
        filesMatching("**/util_functions.sh") {
            filter {
                it.replace(
                    "#MAGISK_VERSION_STUB",
                    "MAGISK_VER='${Config.version}'\nMAGISK_VER_CODE=${Config.versionCode}"
                )
            }
            filter<FixCrLfFilter>("eol" to FixCrLfFilter.CrLf.newInstance("lf"))
        }
    }

    val syncResources = tasks.register("syncResources", Sync::class.java) {
        dependsOn(syncAssets)
        into("src/main/resources/META-INF/com/google/android")
        from(rootProject.file("scripts/update_binary.sh")) {
            rename { "update-binary" }
        }
        from(rootProject.file("scripts/flash_script.sh")) {
            rename { "updater-script" }
        }
    }

    android.applicationVariants.all {
        preBuildProvider.get().dependsOn(syncResources)

        val keysDir = rootProject.file("tools/keys")
        val outSrcDir = File(buildDir, "generated/source/keydata/$name")
        val outSrc = File(outSrcDir, "com/topjohnwu/magisk/signing/KeyData.java")

        val genSrcTask = tasks.register("generate${name.capitalize(Locale.ROOT)}KeyData") {
            inputs.dir(keysDir)
            outputs.file(outSrc)
            doLast {
                genKeyData(keysDir, outSrc)
            }
        }
        registerJavaGeneratingTask(genSrcTask, outSrcDir)
    }
}

fun Project.setupStub() {
    setupAppCommon()

    android.applicationVariants.all {
        val variantCapped = name.capitalize(Locale.ROOT)
        val variantLowered = name.toLowerCase(Locale.ROOT)
        val manifest = file("src/${variantLowered}/AndroidManifest.xml")
        val outSrcDir = File(buildDir, "generated/source/obfuscate/${variantLowered}")
        val templateDir = file("template")
        val aapt = File(android.sdkDirectory, "build-tools/${android.buildToolsVersion}/aapt2")
        val apk = File(buildDir, "intermediates/processed_res/" +
            "${variantLowered}/out/resources-${variantLowered}.ap_")
        val apkTmp = File("${apk}.tmp")

        val genManifestTask = tasks.register("generate${variantCapped}ObfuscatedManifest") {
            doLast {
                val xml = genStubManifest(templateDir, outSrcDir)
                manifest.parentFile.mkdirs()
                PrintStream(manifest).use {
                    it.print(xml)
                }
            }
        }
        tasks.getByPath(":stub:process${variantCapped}MainManifest").dependsOn(genManifestTask)

        val genSrcTask = tasks.register("generate${variantCapped}ObfuscatedSources") {
            dependsOn(":stub:process${variantCapped}Resources")
            inputs.file(apk)
            outputs.file(apk)
            doLast {
                exec {
                    commandLine(aapt, "optimize", "-o", apkTmp, "--collapse-resource-names", apk)
                }

                val buffer = ByteArrayOutputStream()
                apkTmp.inputStream().use {
                    object : GZIPOutputStream(buffer) {
                        init {
                            def.setLevel(Deflater.BEST_COMPRESSION)
                        }
                    }.use { o ->
                        it.transferTo(o)
                    }
                }
                ZipFile(apkTmp).use { o ->
                    ZipOutputStream(apk.outputStream()).use { n ->
                        n.setLevel(Deflater.BEST_COMPRESSION)
                        n.putNextEntry(ZipEntry("AndroidManifest.xml"))
                        o.getInputStream(o.getEntry("AndroidManifest.xml")).transferTo(n)
                        n.closeEntry()
                        n.finish()
                    }
                }
                apkTmp.delete()
                genEncryptedResources(ByteArrayInputStream(buffer.toByteArray()), outSrcDir)
            }
        }
        registerJavaGeneratingTask(genSrcTask, outSrcDir)
    }
    // Override optimizeReleaseResources task
    tasks.whenTaskAdded {
        val apk = File(buildDir, "intermediates/processed_res/" +
            "release/out/resources-release.ap_")
        val optRes = File(buildDir, "intermediates/optimized_processed_res/" +
            "release/resources-release-optimize.ap_")
        if (name == "optimizeReleaseResources") {
            doLast { apk.copyTo(optRes, true) }
        }
    }
    tasks.named<Delete>("clean") {
        delete.addAll(listOf("src/debug/AndroidManifest.xml", "src/release/AndroidManifest.xml"))
    }
}