import java.io.File

import java.util.Properties

plugins {

    alias(libs.plugins.android.application)

    alias(libs.plugins.kotlin.compose)

    alias(libs.plugins.kotlin.serialization)

    alias(libs.plugins.screenshot)

}

// The Rust core (rust-core/, over oxy-core) is built for the app's ABIs by

// cargo-ndk and its Kotlin bindings generated by uniffi at build time

// (oxygenhub-android#1): nothing built is kept in the repository.

val rustCore: File = rootProject.file("rust-core")

val rustJniLibs = layout.buildDirectory.dir("rustJniLibs")

val rustBindings = layout.buildDirectory.dir("generated/uniffi/kotlin")

fun androidNdk(): String {

    System.getenv("ANDROID_NDK_HOME")?.let { return it }

    val props = Properties()

    val local = rootProject.file("local.properties")

    if (local.exists()) local.inputStream().use { input -> props.load(input) }

    val sdk = props.getProperty("sdk.dir") ?: System.getenv("ANDROID_HOME")

        ?: error("set sdk.dir in local.properties or ANDROID_HOME")

    val ndks = File(sdk, "ndk").listFiles()?.filter { f -> f.isDirectory }?.sortedBy { f -> f.name }.orEmpty()

    return ndks.lastOrNull()?.path ?: error("no NDK under $sdk/ndk: install one with the SDK manager")

}

val buildRustCore = tasks.register("buildRustCore", Exec::class) {

    description = "Builds rust-core for arm64-v8a and x86_64 with cargo-ndk."

    workingDir = rustCore

    inputs.dir(rustCore.resolve("src"))

    inputs.files(rustCore.resolve("Cargo.toml"), rustCore.resolve("Cargo.lock"))

    // The runner's Rust (OxygenFlow and its oxy-core) is built in too.

    inputs.files(fileTree(rootProject.file("oxygenflow")) { include("**/*.rs", "**/Cargo.toml"); exclude("**/target/**") })

    outputs.dir(rustJniLibs)

    environment("ANDROID_NDK_HOME", androidNdk())

    commandLine("cargo", "ndk", "-t", "arm64-v8a", "-t", "x86_64", "--platform", "31", "-o", rustJniLibs.get().asFile.path, "build", "--release")

}

val generateRustBindings = tasks.register("generateRustBindings", Exec::class) {

    description = "Generates rust-core's Kotlin bindings with uniffi."

    dependsOn(buildRustCore)

    workingDir = rustCore

    inputs.dir(rustJniLibs)

    inputs.file(rustCore.resolve("uniffi.toml"))

    outputs.dir(rustBindings)

    commandLine(

        "cargo", "run", "--release", "--bin", "uniffi-bindgen", "generate",

        "--library", rustJniLibs.get().file("arm64-v8a/librust_core.so").asFile.path,

        "--language", "kotlin", "--out-dir", rustBindings.get().asFile.path,

    )

}

tasks.named("preBuild") { dependsOn(generateRustBindings) }

// The Firebase client settings alerts need (#16), read from

// app/google-services.json without Google's Gradle plugin: none, no alerts.

val firebase: Map<String, String> = run {

    val file = File(projectDir, "google-services.json")

    if (!file.isFile) return@run emptyMap()

    @Suppress("UNCHECKED_CAST")

    val json = groovy.json.JsonSlurper().parse(file) as Map<String, Any?>

    val project = json["project_info"] as Map<String, Any?>

    val client = (json["client"] as List<Map<String, Any?>>).first {

        ((it["client_info"] as Map<String, Any?>)["android_client_info"] as Map<String, Any?>)["package_name"] == "io.oxygenhub.android"

    }

    mapOf(

        "app_id" to (client["client_info"] as Map<String, Any?>)["mobilesdk_app_id"].toString(),

        "project_id" to project["project_id"].toString(),

        "sender_id" to project["project_number"].toString(),

        "api_key" to ((client["api_key"] as List<Map<String, Any?>>).first()["current_key"]).toString(),

    )

}

// The version, from gradle.properties (#7).

val appVersion: String = providers.gradleProperty("oxygenhub.version").get()

val appVersionCode: Int = appVersion.split(".").map { it.toInt() }.let { (a, b, c) -> a * 10000 + b * 100 + c }

// Release signing (#7): the release job decodes its keystore secret to a

// file and names it and the password's file here. Without them a release

// build is unsigned, so nothing else needs the key.

val releaseKeystore: File? = providers.environmentVariable("OXYGENHUB_KEYSTORE").orNull?.let { File(it) }?.takeIf { it.isFile }

val releasePassword: String? =

    providers.environmentVariable("OXYGENHUB_KEYSTORE_PASSWORD_FILE").orNull?.let { File(it).readText().trim() }

android {

    namespace = "io.oxygenhub.android"

    compileSdk {

        version = release(37)

    }

    defaultConfig {

        applicationId = "io.oxygenhub.android"

        minSdk = 31

        targetSdk = 37

        versionCode = appVersionCode

        versionName = appVersion

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

        // Firebase for alerts (#16), from google-services.json when the

        // build has one (the release job writes it from a secret); empty,

        // the app takes no alerts.

        buildConfigField("String", "FIREBASE_APP_ID", "\"${firebase["app_id"].orEmpty()}\"")

        buildConfigField("String", "FIREBASE_PROJECT_ID", "\"${firebase["project_id"].orEmpty()}\"")

        buildConfigField("String", "FIREBASE_SENDER_ID", "\"${firebase["sender_id"].orEmpty()}\"")

        buildConfigField("String", "FIREBASE_API_KEY", "\"${firebase["api_key"].orEmpty()}\"")

    }

    signingConfigs {

        if (releaseKeystore != null && releasePassword != null) {

            create("release") {

                storeFile = releaseKeystore

                storeType = "PKCS12"

                storePassword = releasePassword

                keyAlias = "oxygenhub"

                keyPassword = releasePassword

            }

        }

    }

    buildTypes {

        // Unit test coverage as JaCoCo XML for the hub's Coverage tab

        // (#19): ./gradlew :app:createDebugUnitTestCoverageReport.

        debug {

            enableUnitTestCoverage = true

        }

        release {

            optimization {

                enable = false

            }

            signingConfigs.findByName("release")?.let { signingConfig = it }

        }

    }

    compileOptions {

        sourceCompatibility = JavaVersion.VERSION_11

        targetCompatibility = JavaVersion.VERSION_11

    }

    packaging {

        jniLibs {

            useLegacyPackaging = true

        }

    }

    buildFeatures {

        compose = true

        buildConfig = true

    }

    // README screenshots, rendered from previews without an emulator:

    // ./gradlew :app:updateDebugScreenshotTest (src/screenshotTest).

    experimentalProperties["android.experimental.enableScreenshotTest"] = true

    sourceSets["main"].jniLibs.directories.add(rustJniLibs.get().asFile.path)

    sourceSets["main"].kotlin.directories.add(rustBindings.get().asFile.path)

}

dependencies {

    implementation(libs.jna) { artifact { type = "aar" } }

    implementation(platform(libs.androidx.compose.bom))

    implementation(platform(libs.firebase.bom))

    implementation(libs.firebase.messaging)

    implementation(libs.androidx.activity.compose)

    implementation(libs.androidx.compose.material3)

    implementation(libs.androidx.compose.material3.navigation.suite)

    implementation(libs.androidx.compose.material3.adaptive)

    implementation(libs.androidx.compose.material3.adaptive.layout)

    implementation(libs.androidx.compose.material3.adaptive.navigation)

    implementation(libs.androidx.compose.material.icons.extended)

    implementation(libs.androidx.compose.ui)

    implementation(libs.androidx.compose.ui.graphics)

    implementation(libs.androidx.compose.ui.tooling.preview)

    implementation(libs.androidx.core.ktx)

    implementation(libs.androidx.lifecycle.runtime.ktx)

    implementation(libs.androidx.lifecycle.runtime.compose)

    implementation(libs.androidx.lifecycle.viewmodel.compose)

    implementation(libs.androidx.navigation.compose)

    implementation(libs.kotlinx.serialization.json)

    implementation(libs.kotlinx.coroutines.android)

    implementation(libs.okhttp)

    implementation(libs.markdown.renderer.m3)

    implementation(libs.highlights)

    testImplementation(libs.junit)

    testImplementation(libs.kotlinx.coroutines.test)

    testImplementation(libs.okhttp.mockwebserver)

    androidTestImplementation(platform(libs.androidx.compose.bom))

    androidTestImplementation(libs.androidx.compose.ui.test.junit4)

    androidTestImplementation(libs.androidx.espresso.core)

    androidTestImplementation(libs.androidx.junit)

    screenshotTestImplementation(libs.screenshot.validation.api)

    screenshotTestImplementation(libs.androidx.compose.ui.tooling)

    screenshotTestImplementation(libs.kotlinx.coroutines.test)

    debugImplementation(libs.androidx.compose.ui.test.manifest)

    debugImplementation(libs.androidx.compose.ui.tooling)

}