// :app — MainActivity, Application, Hilt wiring (every :core:model interface bound to :data, D-041 and D-085),
// navigation and deep links, push handling and notifications, network security and release signing (SPEC §6.2).
import java.util.Properties

plugins {
    id("kvitt.android.application")
    id("kvitt.android.compose")
    id("kvitt.android.hilt")
    id("kvitt.android.screenshots")
    alias(libs.plugins.google.services)
}

// SPEC §10.6: release signing from android/local.properties (git-ignored); without the keys the release build is unsigned.
val localProperties = Properties().apply {
    val file = rootProject.file("local.properties")
    if (file.isFile) file.inputStream().use { load(it) }
}
val releaseStoreFile: String? = localProperties.getProperty("kvitt.release.storeFile")

// D-121: Kvitt's public host name (SPEC §8.5, §10.6), as BuildConfig.PUBLIC_HOST, the manifest placeholder publicHost
// (the https invite links of AC-2.6, default port 443, D-124) and RELEASE_SERVER_URL = https://<host> (AC-2.7). From
// -Pkvitt.publicHost (infra/publish-apk.sh passes it, from KVITT_PUBLIC_HOST in infra/pi/.env), else the key
// kvitt.publicHost in android/local.properties (the owner sets it there; never committed), else the placeholder
// kvitt.example.invalid (RFC 2606: never resolves), so a release built without it cannot talk to a real host. Debug
// builds pair with the server address typed on S-1 and need none of it.
val publicHost: String = (
    providers.gradleProperty("kvitt.publicHost").orNull?.trim()?.takeIf { it.isNotEmpty() }
        ?: localProperties.getProperty("kvitt.publicHost")?.trim()?.takeIf { it.isNotEmpty() }
        ?: "kvitt.example.invalid"
    ).lowercase()
require(Regex("[a-z0-9]([a-z0-9-]*[a-z0-9])?(\\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)+").matches(publicHost)) {
    "kvitt.publicHost must be a host name such as kvitt.duckdns.org (no scheme, port or path), was '$publicHost'"
}

// D-126: the app key for the reverse proxy (SPEC §8.5, §14.3.1). Every request to the server carries X-Kvitt-App: <key>;
// outside the home LAN the proxy closes any request without it. From -Pkvitt.appKey, else the key kvitt.appKey in
// android/local.properties (the owner sets it there; never committed), else empty: no header (debug builds against the
// dev server need none). A secret: never logged, and the failure below names its length only, never its value.
val appKey: String =
    providers.gradleProperty("kvitt.appKey").orNull?.trim()?.takeIf { it.isNotEmpty() }
        ?: localProperties.getProperty("kvitt.appKey")?.trim()?.takeIf { it.isNotEmpty() }
        ?: ""
require(appKey.isEmpty() || Regex("[!-~]{16,128}").matches(appKey)) {
    "kvitt.appKey must be 16 to 128 printable ASCII characters without whitespace (D-126); the value given has " +
        "${appKey.length} characters"
}

// SPEC §10.5.3 (D-082): the pinned NPM root (D-120) replaces the system anchors for kvitt.publicHost only when this is true.
val pinnedRoot = providers.gradleProperty("kvitt.tls.pinnedRoot").orElse("false").get().toBoolean()

/**
 * Writes res/xml/network_security_config.xml from [template] with `@PUBLIC_HOST@` replaced by [host] (D-121). The
 * fallback is not prepared (§10.5.3): without the committed root [rootCa] the build stops here with that message.
 */
abstract class PinnedRootConfigTask : DefaultTask() {
    @get:InputFile @get:PathSensitive(PathSensitivity.NONE) abstract val template: RegularFileProperty
    @get:Input abstract val host: Property<String>
    @get:Internal abstract val rootCa: RegularFileProperty
    @get:OutputDirectory abstract val outputDir: DirectoryProperty

    @TaskAction
    fun write() {
        val ca = rootCa.get().asFile
        if (!ca.isFile) throw GradleException("kvitt.tls.pinnedRoot=true needs the pinned root ${ca.path} (SPEC §10.5.3)")
        val root = outputDir.get().asFile
        root.deleteRecursively()
        val xml = root.resolve("xml/network_security_config.xml")
        xml.parentFile.mkdirs()
        xml.writeText(template.get().asFile.readText().replace("@PUBLIC_HOST@", host.get()))
    }
}

android {
    namespace = "se.hagstedt.kvitt"
    defaultConfig {
        applicationId = "se.hagstedt.kvitt"
        // SPEC §10.6: the release script passes kvitt.versionCode and kvitt.versionName; debug builds use 1 and "dev".
        versionCode = providers.gradleProperty("kvitt.versionCode").orElse("1").get().toInt()
        versionName = providers.gradleProperty("kvitt.versionName").orElse("dev").get()
        buildConfigField("String", "PUBLIC_HOST", "\"$publicHost\"")
        buildConfigField("String", "APP_KEY", "\"${appKey.replace("\\", "\\\\").replace("\"", "\\\"")}\"")
        manifestPlaceholders["publicHost"] = publicHost
    }
    // SPEC G-8 and AC-19.1: the app is English (fallback) and Swedish only; library translations of other languages
    // are left out of the APK.
    androidResources {
        localeFilters += listOf("en", "sv")
    }
    // BuildConfig carries versionCode, versionName, DEBUG and APP_KEY (D-126) into AppBuildInfo (:data, D-041), and
    // PUBLIC_HOST (D-121).
    buildFeatures {
        buildConfig = true
    }
    signingConfigs {
        if (releaseStoreFile != null) {
            create("release") {
                storeFile = file(releaseStoreFile)
                storePassword = localProperties.getProperty("kvitt.release.storePassword")
                keyAlias = localProperties.getProperty("kvitt.release.keyAlias")
                keyPassword = localProperties.getProperty("kvitt.release.keyPassword")
            }
        }
    }
    buildTypes {
        debug {
            applicationIdSuffix = ".debug"
        }
        release {
            if (releaseStoreFile != null) signingConfig = signingConfigs.getByName("release")
            // SPEC §10.6: R8 shrinks, optimises and obfuscates the release APK; the libraries' consumer rules plus
            // proguard-rules.pro. publish-apk.sh keeps build/outputs/mapping/release/mapping.txt next to the APK.
            isMinifyEnabled = true
            isShrinkResources = true
            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
        }
    }
}

// The pinned-root network security config (generated from src/releasePinnedRoot, trusting src/release/res/raw/
// kvitt_root_ca.crt) only in release builds and only when kvitt.tls.pinnedRoot=true; otherwise src/main's
// system-anchors config applies.
if (pinnedRoot) {
    val pinnedRootConfig = tasks.register("generatePinnedRootNetworkSecurityConfig", PinnedRootConfigTask::class.java) {
        description = "Writes the pinned-root network security config for kvitt.publicHost (SPEC §10.5.3)."
        template.set(layout.projectDirectory.file("src/releasePinnedRoot/network_security_config.xml"))
        host.set(publicHost)
        rootCa.set(layout.projectDirectory.file("src/release/res/raw/kvitt_root_ca.crt"))
    }
    androidComponents.onVariants(androidComponents.selector().withBuildType("release")) { variant ->
        variant.sources.res?.addGeneratedSourceDirectory(pinnedRootConfig, PinnedRootConfigTask::outputDir)
    }
}

dependencies {
    implementation(project(":core:model"))
    implementation(project(":core:design"))
    implementation(project(":domain"))
    implementation(project(":data"))
    implementation(project(":adapter:fcm"))
    implementation(project(":feature:onboarding"))
    implementation(project(":feature:home"))
    implementation(project(":feature:account"))
    implementation(project(":feature:expense"))
    implementation(project(":feature:settle"))
    implementation(project(":feature:analytics"))
    implementation(project(":feature:settings"))
    testImplementation(project(":core:fakes"))
    testImplementation(testFixtures(project(":core:design")))

    implementation(libs.androidx.core.ktx)
    implementation(libs.androidx.activity.compose)
    implementation(libs.androidx.navigation.compose)
    implementation(libs.androidx.lifecycle.runtime.compose)
    implementation(libs.androidx.lifecycle.process)
    implementation(libs.androidx.work.runtime.ktx)
    implementation(libs.kotlinx.coroutines.core)
    implementation(libs.kotlinx.datetime)
    implementation(libs.coil)
}