import java.io.ByteArrayOutputStream
import java.time.Instant
import java.time.ZoneOffset
import java.time.format.DateTimeFormatter

/**
 * The commit this APK was built from.
 *
 * Exists so "which build am I running?" is answerable from the phone rather than by trusting
 * that a publish worked -- a cached download looks identical to a failed publish.
 */
fun gitDescribe(): String = try {
    val out = ByteArrayOutputStream()
    providers.exec {
        commandLine("git", "describe", "--always", "--dirty", "--abbrev=8")
    }.standardOutput.asText.get().trim().ifEmpty { "unknown" }
} catch (e: Exception) {
    "unknown"
}

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("org.jetbrains.kotlin.plugin.serialization")
    id("org.jetbrains.kotlin.plugin.compose")
    id("com.google.devtools.ksp")
    id("io.gitlab.arturbosch.detekt")
    id("jacoco")
    id("com.chaquo.python")
}

android {
    // Room schema JSON, so migrations can be tested against a real prior schema.
    ksp {
        arg("room.schemaLocation", "$projectDir/schemas")
    }

    // MigrationTestHelper reads the exported schemas off the device, so they have to ship with
    // the instrumented test APK. Without this the migration test fails with a missing-asset
    // error that does not name the schema it wanted.
    sourceSets.getByName("androidTest").assets.srcDir("$projectDir/schemas")

    namespace = "org.terst.listen"
    compileSdk = 36

    defaultConfig {
        applicationId = "org.terst.listen"
        // Deliberately not FeeDreader's minSdk. That value is 36 in its working tree, which
        // would restrict the app to Android 16 and newer; 29 covers any phone in real use and
        // is comfortably above Media3's floor of 21.
        minSdk = 29
        targetSdk = 36
        versionCode = 1
        versionName = "1.0"
        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

        buildConfigField("String", "GIT_COMMIT", "\"${gitDescribe()}\"")
        buildConfigField(
            "String",
            "BUILD_TIME",
            "\"${DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm")
                .withZone(ZoneOffset.UTC).format(Instant.now())}\"",
        )

        ndk {
            // CPython ships as native code, so every ABI included multiplies the APK size.
            // arm64 is the phone; x86_64 is the emulator.
            //
            // `-PphoneOnly` drops the emulator's copy: measured at 114MB -> 99MB, so 15MB and
            // not the halving it looks like it should be. The APK is dominated by 72MB of
            // unminified debug dex, with Chaquopy's assets and one ABI's CPython adding ~25MB
            // between them; shrinking it meaningfully means R8 on a debug build, not ABIs.
            //
            // Not the default: a build with no flag has to stay installable on the emulator too,
            // or it stops being usable by whoever forgets. Pass it for a build only the phone
            // will ever install.
            abiFilters += if (project.hasProperty("phoneOnly")) {
                listOf("arm64-v8a")
            } else {
                listOf("arm64-v8a", "x86_64")
            }
        }

    }

    signingConfigs {
        // A checked-in debug key, deliberately.
        //
        // Android generates a per-machine debug keystore, so a build from tungsten and a build
        // from the laptop are signed differently and each refuses to install over the other --
        // "App not installed", with the only remedy being an uninstall that destroys every
        // playback position. Two machines build this app, so the key has to be shared.
        //
        // This is tungsten's existing debug keystore rather than a fresh one, chosen because
        // that is the key already installed on the phone -- a new key would have forced a
        // second uninstall and a second loss of every playback position.
        //
        // Safe to commit: it signs debug builds of a personal sideloaded app and nothing else.
        // It must never be used for a Play release, where the signing key is the app's identity.
        getByName("debug") {
            storeFile = file("$rootDir/keystore/listen-debug.keystore")
            // Android's standard debug credentials: this IS the platform debug keystore,
            // copied in so both machines sign identically. Keeping the stock alias and
            // password means an APK built here is byte-compatible with one built by a
            // default Android toolchain on any other machine.
            storePassword = "android"
            keyAlias = "androiddebugkey"
            keyPassword = "android"
        }
    }

    buildTypes {
        debug {
            enableUnitTestCoverage = true
            // No enableAndroidTestCoverage. Turning it on to feed instrumented data into a
            // coverage report instruments every class in the debug build: measured, it added
            // 25MB to the APK (118MB -> 143MB) and runtime probes to code Peter actually uses.
            // That is a real cost on every sideload for a report that would be run rarely, so
            // the framework-adapter exclusions carry this on their own.
        }
        release {
            isMinifyEnabled = false
        }
    }

    buildFeatures {
        compose = true
        buildConfig = true
    }

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

    kotlinOptions {
        jvmTarget = "11"
    }

    testOptions {
        unitTests {
            // Room's and Media3's Android stubs otherwise throw on every call from a JVM test.
            isReturnDefaultValues = true
        }
    }
}

dependencies {
    val composeBom = platform("androidx.compose:compose-bom:2026.06.01")
    implementation(composeBom)
    androidTestImplementation(composeBom)

    implementation("androidx.core:core-ktx:1.17.0")
    implementation("androidx.activity:activity-compose:1.11.0")
    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.9.4")
    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.9.4")
    implementation("androidx.navigation:navigation-compose:2.9.5")

    implementation("androidx.compose.ui:ui")
    implementation("androidx.compose.ui:ui-graphics")
    implementation("androidx.compose.ui:ui-tooling-preview")
    implementation("androidx.compose.material3:material3")
    implementation("androidx.compose.material:material-icons-extended")

    // Artwork loading. Wired to the app's own OkHttpClient (see AppGraph.imageLoader)
    // rather than Coil's default, so image fetches share connection pooling and timeouts
    // with the rest of the app. Pinned to 3.3.0: 3.4.0+ requires a newer Kotlin stdlib than
    // this project's 2.2.21, and 3.6.0+ pulls Compose 1.12, which needs compileSdk 37 --
    // one above the max AGP 8.13.2 supports.
    val coil = "3.3.0"
    implementation("io.coil-kt.coil3:coil-compose:$coil")
    implementation("io.coil-kt.coil3:coil-network-okhttp:$coil")

    // Drag-to-reorder for the queue screen, backing QueueOrdering.move.
    implementation("sh.calvin.reorderable:reorderable:3.1.0")

    // Media3 is the whole playback stack: ExoPlayer for decode and speed control,
    // MediaSessionService for lock-screen and Bluetooth transport, and its DownloadManager,
    // which shares a cache with playback so a partly-downloaded episode streams the remainder
    // instead of failing.
    val media3 = "1.8.0"
    implementation("androidx.media3:media3-exoplayer:$media3")
    implementation("androidx.media3:media3-session:$media3")
    implementation("androidx.media3:media3-ui:$media3")
    implementation("androidx.media3:media3-datasource-okhttp:$media3")

    implementation("androidx.room:room-runtime:2.8.4")
    implementation("androidx.room:room-ktx:2.8.4")
    ksp("androidx.room:room-compiler:2.8.4")

    implementation("androidx.work:work-runtime-ktx:2.10.5")
    implementation("androidx.datastore:datastore-preferences:1.1.7")

    implementation("com.squareup.okhttp3:okhttp:4.12.0")
    // 1.8.1 rather than something older because Room 2.8's schema-bundle parser -- the thing
    // MigrationTest leans on -- calls a GeneratedSerializer method that 1.7.3 does not have,
    // and fails at runtime with an AbstractMethodError rather than at build time. AGP resolves
    // the androidTest classpath consistently with the app's, so the floor has to be raised
    // here; raising it in androidTestImplementation alone has no effect.
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.0")
    // Bridges suspend functions to the Guava ListenableFuture that Media3's browse callbacks
    // return. kotlinx-coroutines-jdk8's future builder produces a CompletableFuture, which is
    // the wrong type here.
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-guava:1.8.0")

    testImplementation("junit:junit:4.13.2")
    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.8.0")
    testImplementation("androidx.room:room-testing:2.8.4")
    // The JVM has no XmlPullParser implementation; the feed parser needs a real one under test.
    testImplementation("net.sf.kxml:kxml2:2.3.0")
    testImplementation("xmlpull:xmlpull:1.1.3.1")
    testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
    testImplementation("androidx.test:core:1.7.0")

    androidTestImplementation("androidx.test.ext:junit:1.3.0")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.7.0")
    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
    androidTestImplementation("androidx.room:room-testing:2.8.4")
    androidTestImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.8.0")

    debugImplementation("androidx.compose.ui:ui-tooling")
    debugImplementation("androidx.compose.ui:ui-test-manifest")
}

chaquopy {
    defaultConfig {
        // Not the default 3.8. yt-dlp dropped Python 3.8 support, so pip silently resolves the
        // last release that still supported it -- 2024.10.22 -- which is stale enough that
        // YouTube extraction no longer works. The build succeeds and the feature doesn't.
        version = "3.12"
        // The extractor itself. yt-dlp is pure Python and updates independently of this app,
        // which is the entire reason for embedding it rather than reimplementing YouTube's
        // stream resolution against a target that changes without notice.
        pip {
            install("yt-dlp")
        }
    }
}

detekt {
    buildUponDefaultConfig = true
    config.setFrom(files("$rootDir/config/detekt/detekt.yml"))
    baseline = file("$rootDir/config/detekt/baseline.xml")
}

jacoco {
    toolVersion = "0.8.12"
}

/**
 * What coverage does not count.
 *
 * Compose screens are excluded for the same reason as FeeDreader: they are impractical to
 * unit-test and including them makes the metric meaningless.
 *
 * They are named one screen file at a time rather than by excluding the whole `ui` package,
 * which is what this used to do. That blanket pattern also hid six view models -- plain Kotlin
 * classes with real decisions in them, every one measuring 0% and not one of them a Compose
 * screen -- behind a justification that only ever applied to the screens. The list below is
 * longer, and that is its honest length: each glob names the classes one screen file compiles
 * to (its `...Kt` class, its `ComposableSingletons` holder, and the state and action objects
 * only that screen constructs). Nothing else under `ui` is excluded.
 *
 * The action and state objects are excluded on a different ground from the screens, and it is
 * worth being explicit so the list does not grow by analogy. They are not hard to execute off a
 * device -- `EpisodeActions(play = {}, ...)` constructs fine. They are excluded because every
 * line jacoco counts in them is one Kotlin generated: the constructor, `componentN`, `copy`,
 * `equals`, `hashCode`, `toString`. There is no statement of this app's own in any of them, so
 * measuring them measures the compiler. **That is the whole of the reason**, and it does not
 * extend to a data class that gains a method, an `init` block or a default computed from
 * another field -- the moment one does, it comes off this list.
 *
 * Two entries need saying out loud. The BreakJudgingKt glob excludes only the composables in
 * BreakJudging.kt; the `BreakJudging` and `BreakJudgingSource` classes beside them stay
 * measured. And the EpisodeScreenKt glob takes the tested `stripHtml` out of the measurement
 * along with the screen it happens to live in -- a cost of excluding by file, not a reason to
 * stop testing it.
 *
 * The rest are framework adapters -- classes whose whole body is a call into ExoPlayer, Media3,
 * Room, WorkManager or Chaquopy, none of which can execute on the JVM. They were overridden
 * eight times in a row with `COVERAGE_EXCEPTION`, and the last few were perverse: extracting
 * decisions *out* of a service into tested classes lowered the number, and writing an
 * instrumented test for a migration lowered it again. A metric that punishes both is measuring
 * how much Android glue exists rather than how well the logic is tested.
 *
 * **Adding to this list needs a reason, not just a name.** The bar is "cannot execute off a
 * device", not "awkward to test" -- QueueRepository, PlaybackAdvancer, EpisodeDownloader and
 * ChapterFetcher all touch framework-adjacent things and all stay measured, because their
 * logic runs fine against fakes.
 */
val coverageExclusions = listOf(
    // Compose screens, one file at a time. See the note above: `**/ui/**` also hid the view
    // models, which are ordinary classes and are measured.
    //
    // Every Compose file compiles a `ComposableSingletons` holder for its constant lambdas.
    // It is generated, there is nothing in it to test, and it belongs to the screen it is
    // named after.
    "**/ui/ComposableSingletons\$*",

    "**/ui/MainActivity*",
    "**/ui/ShareReceiverActivity*",
    "**/ui/BreakJudgingKt*",
    "**/ui/DripSettingsKt*",
    "**/ui/EpisodeDescriptionKt*",
    "**/ui/EpisodeOverflowKt*",
    "**/ui/EpisodeRowKt*",
    "**/ui/EpisodeScreenKt*",
    "**/ui/EpisodeTimelineKt*",
    "**/ui/EpisodeTransportKt*",
    "**/ui/FurnitureSkipSettingsStateKt*",
    "**/ui/LibraryScreenKt*",
    "**/ui/NowPlayingBarKt*",
    "**/ui/PlayerBarKt*",
    "**/ui/PlayerMessageKt*",
    "**/ui/QueueScreenKt*",
    "**/ui/RuleConditionFieldsKt*",
    "**/ui/RuleEditScreenKt*",
    "**/ui/RulesScreenKt*",
    "**/ui/SettingRowsKt*",
    "**/ui/SettingsScreenKt*",
    "**/ui/ShowSettingsSheetKt*",
    "**/ui/SkipServerSettingsStateKt*",
    "**/ui/SkipSettingsKt*",
    "**/ui/SubscriptionRowKt*",
    "**/ui/SubscriptionScreenKt*",
    "**/ui/CategorySettingKt*",
    "**/ui/TranscriptScreenKt*",

    // A screen's own parameter and state objects: data classes of callbacks and already-decided
    // values, handed from one composable to another. They decide nothing, they are constructed
    // only inside the files above, and the only test that could reach one would call its
    // constructor and assert nothing.
    //
    // Excluded by what they are rather than by which file they sit in. Most are declared inside
    // their screen and were already covered by the globs above; these five happen to have files
    // of their own, and a line that excluded one and measured the other would be describing the
    // author's filing rather than the code.
    "**/ui/EpisodeActions*",
    "**/ui/EpisodeDetailActions*",
    "**/ui/EpisodeDetailState*",
    "**/ui/EpisodeHooks*",
    "**/ui/EpisodePlayback*",
    "**/ui/FurnitureSkipSettings*",
    "**/ui/LibraryContent*",
    "**/ui/LibraryNav*",
    "**/ui/LibraryTopBarActions*",
    "**/ui/NowPlayingActions*",
    "**/ui/OverflowContent*",
    "**/ui/QueueNav*",
    "**/ui/QueueRowActions*",
    "**/ui/ScreenSource*",
    "**/ui/SkipServerSettings*",
    "**/ui/SkipSettings*",
    "**/ui/SubscriptionNav*",
    "**/ui/SubscriptionTopBarActions*",

    "**/R.class", "**/R\$*.class", "**/BuildConfig.*", "**/*_Impl*",

    // ExoPlayer, MediaSession and the browse tree: no JVM equivalent to run against.
    "**/playback/PlaybackService*",
    "**/playback/PlayerConnection*",
    "**/playback/ListenSessionCallback*",
    "**/playback/LibraryTree*",
    "**/playback/NotificationControls*",
    "**/playback/PodcastPlayer*",
    // Four one-line getters over ExoPlayer state. It lives inside PlaybackService.kt and so
    // reads as covered by the line above, but it compiles to its own class and was being
    // measured. It is the seam that makes PositionWriter testable, not logic in its own right.
    "**/playback/ExoPlayhead*",

    // Room's own machinery, including the migrations -- proven on a device by MigrationTest.
    "**/data/AppDatabase*",

    // WorkManager entry points; the decisions live in DownloadDrainer, RetentionSweeper and
    // QueuedDownloads, which are measured.
    "**/work/RefreshWorker*",
    "**/work/DownloadWorker*",
    "**/work/RetentionWorker*",
    // Same rule: the decisions are WaitingDownloads', which bounds the retry two ways and is
    // measured. This is the WorkManager entry point that calls it.
    "**/work/RetryWaitingWorker*",
    "**/work/Scheduling*",

    // DataStore: a Context, a file and a generated Flow. Nothing here decides anything.
    "**/data/Preferences*",

    // The embedded CPython bridge, and the app/graph wiring that only constructs things.
    "**/download/ChaquopyAudioSource*",
    "**/youtube/YouTubeAudio*",
    "**/data/Graph*",
    "**/data/AppGraph*",
    "**/ListenApp*",

    // On-device detection used three entries here -- MediaCodecClipSource for the decode loop and
    // the two workers that drove it. All three classes are gone; see the on-device-detection tag.
)

tasks.register<JacocoReport>("jacocoTestReport") {
    dependsOn("testDebugUnitTest")
    reports {
        xml.required.set(true)
        html.required.set(true)
    }
    val kotlinDebugTree = fileTree("${layout.buildDirectory.get()}/tmp/kotlin-classes/debug") {
        exclude(coverageExclusions)
    }
    val javaDebugTree = fileTree("${layout.buildDirectory.get()}/intermediates/javac/debug") {
        exclude(coverageExclusions)
    }
    classDirectories.setFrom(files(kotlinDebugTree, javaDebugTree))
    sourceDirectories.setFrom(files("src/main/java"))
    executionData.setFrom(fileTree(layout.buildDirectory) { include("**/*.exec") })
}