import com.android.build.api.dsl.CommonExtension
import com.android.build.api.extension.impl.AndroidComponentsExtensionImpl
import com.slack.keeper.optInToKeeper
import org.gradle.api.tasks.testing.logging.TestExceptionFormat
import org.gradle.internal.jvm.Jvm
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
import org.jlleitschuh.gradle.ktlint.KtlintExtension
import java.nio.file.Files
import java.nio.file.Paths
import java.nio.file.StandardOpenOption
import java.util.Properties
import kotlin.math.max
import kotlin.system.exitProcess
import kotlin.time.Duration.Companion.milliseconds


// Top-level build file where you can add configuration options common to all subprojects/modules.
plugins {
    alias(libs.plugins.android.application) apply false
    alias(libs.plugins.android.library) apply false
    alias(libs.plugins.kotlin.android) apply false
    alias(libs.plugins.kotlin.parcelize) apply false
    alias(libs.plugins.kotlin.jvm) apply false
    alias(libs.plugins.kotlin.serialization) apply false
    alias(libs.plugins.ktlint.gradle.plugin) apply false
    alias(libs.plugins.keeper) apply false
}

val localProperties = Properties()
if (project.rootProject.file("local.properties").exists()) {
    localProperties.load(project.rootProject.file("local.properties").inputStream())
}
val fatalWarnings = localProperties["fatal_warnings"] != "false"

// can't be obtained inside 'subprojects'
val ktlintVersion: String? = libs.versions.ktlint.get()

// Here we extract per-module "best practices" settings to a single top-level evaluation
subprojects {
    apply(plugin = "org.jlleitschuh.gradle.ktlint")
    configure<KtlintExtension> {
        version.set(ktlintVersion)
    }

    afterEvaluate {
        plugins.withType<com.android.build.gradle.BasePlugin> {
            val androidExtension = extensions.getByName("android") as CommonExtension<*, *, *, *, *, *>
            androidExtension.testOptions.unitTests {
                isIncludeAndroidResources = true
            }
            androidExtension.testOptions.unitTests.all {
                // tell backend to avoid rollover time, and disable interval fuzzing
                it.environment("ANKI_TEST_MODE", "1")

                it.maxHeapSize = "2g"
                it.minHeapSize = "1g"

                it.useJUnitPlatform()
                it.testLogging {
                    events("failed", "skipped")
                    showStackTraces = true
                    exceptionFormat = TestExceptionFormat.FULL
                }

                // CI: Log the test results
                it.afterSuite(KotlinClosure2<TestDescriptor, TestResult, Unit>({ desc, result ->
                    if (desc.parent != null) {
                        return@KotlinClosure2 // only log for the root suite
                    }
                    logTestResultsToGitHubActions(desc, result)
                }))

                it.maxParallelForks = gradleTestMaxParallelForks
                it.forkEvery = 40
                it.systemProperties["junit.jupiter.execution.parallel.enabled"] = true
                it.systemProperties["junit.jupiter.execution.parallel.mode.default"] = "concurrent"
            }

            val androidComponentsExtension =
                extensions.findByName("androidComponents") as AndroidComponentsExtensionImpl<*, *, *>
            androidComponentsExtension.beforeVariants { builder ->
                if (testReleaseBuild && builder.name == "playRelease")
                {
                    builder.optInToKeeper()
                }
            }
        }

        /*
        Related to ExperimentalCoroutinesApi: this opt-in is added to enable usage of experimental
        coroutines API, this targets all project modules except the "api" module,
        which doesn't use coroutines so the annotation isn't available. This would normally
        result in a warning, but we treat warnings as errors.
        (see https://youtrack.jetbrains.com/issue/KT-28777/Using-experimental-coroutines-api-causes-unresolved-dependency)
         */
        tasks.withType(KotlinCompile::class.java).configureEach {
            // We use `isInIdeaSync` to resolve a mismatch between Android Studio's code analyzer
            // and the Kotlin 2.3 compiler regarding Explicit Backing Fields. The IDE requires
            // the unsafe '-XXLanguage' flag to clear false syntax errors, but the actual compiler
            // crashes if it receives this flag due to our strict 'warnings as errors'.
            // This workaround safely feeds the unsafe flag *only* to the IDE during Gradle sync,
            // while passing the standard, crash-free flag to the compiler during the actual build.
            val isInIdeaSync = System.getProperty("idea.sync.active").toBoolean()

            compilerOptions {
                allWarningsAsErrors = fatalWarnings
                val compilerArgs = mutableListOf(
                    // https://youtrack.jetbrains.com/issue/KT-73255
                    // Apply @StringRes to both constructor params and generated properties
                    "-Xannotation-default-target=param-property",
                    "-Xexplicit-backing-fields"
                )

                if (isInIdeaSync) {
                    compilerArgs += "-XXLanguage:+ExplicitBackingFields"
                }

                if (project.name != "api") {
                    compilerArgs += "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi"
                    compilerArgs += "-Xcontext-parameters"
                }
                freeCompilerArgs = compilerArgs
            }
        }
    }
}

val jvmVersion = Jvm.current().javaVersion?.majorVersion.parseIntOrDefault(defaultValue = 0)
val minSdk: String? = libs.versions.minSdk.get()
val jvmVersionLowerBound = 21
val jvmVersionUpperBound = 25
if (jvmVersion !in jvmVersionLowerBound..jvmVersionUpperBound) {
    println("\n\n\n")
    println("**************************************************************************************************************")
    println("\n\n\n")
    println("ERROR: AnkiDroid builds with JVM versions between $jvmVersionLowerBound and $jvmVersionUpperBound.")
    println("  Incompatible major version detected: '$jvmVersion'")
    println("\n\n\n")
    if (jvmVersion > jvmVersionUpperBound) {
        println("  If you receive this error because you want to use a newer JDK, we may accept PRs to support new versions.")
        println("  Edit the main build.gradle file, find this message in the file, and add support for the new version.")
        println("  Please make sure the `jacocoTestReport` target works on an emulator with our minSdk (currently $minSdk).")
    } else {
        println("  Please update: Settings - Build, Execution, Deployment - Build Tools - Gradle - Gradle JDK")
    }
    println("\n\n\n")
    println("**************************************************************************************************************")
    println("\n\n\n")
    exitProcess(1)
}

val ciBuild by extra(System.getenv("CI") == "true") // true when running on GitHub Actions
// allows for -Dpre-dex=false to be set
val preDexEnabled by extra("true" == System.getProperty("pre-dex", "true"))
// allows for universal APKs to be generated
val universalApkEnabled by extra("true" == System.getProperty("universal-apk", "false"))

val testReleaseBuild by extra(System.getenv("TEST_RELEASE_BUILD") == "true")
var androidTestVariantName by extra(
    if (testReleaseBuild) "Release" else "Debug"
)

val gradleTestMaxParallelForks by extra(
    if (System.getProperty("os.name") == "Mac OS X") {
        // macOS reports hardware cores. This is accurate for CI, Intel (halved due to SMT) and Apple Silicon
        providers.exec {
            commandLine("sysctl", "-n", "hw.physicalcpu")
        }.standardOutput.asText.get().trim().toInt()
    } else if (ciBuild) {
        // GitHub Actions run on Standard_D4ads_v5 Azure Compute Units with 4 vCPUs
        // They appear to be 2:1 vCPU to CPU on Linux/Windows with two vCPU cores but with performance 1:1-similar
        // Sources to determine the correct Azure Compute Unit (and get CPU count) to tune this:
        // Which Azure compute unit in use? https://github.com/github/docs/blob/a25a33bb6cbf86a629d0a0c7bef624743991f97e/content/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners.md?plain=1#L176
        // What is that compute unit? https://learn.microsoft.com/en-us/azure/virtual-machines/dasv5-dadsv5-series#dadsv5-series
        // How does it perform? https://learn.microsoft.com/en-gb/azure/virtual-machines/linux/compute-benchmark-scores#dadsv5 (vs previous Standard_DS2_v2 https://learn.microsoft.com/en-gb/azure/virtual-machines/linux/compute-benchmark-scores#dv2---general-compute)
        4
    } else {
        // Use 50% of cores to account for SMT which doesn't help this workload
        max(1, Runtime.getRuntime().availableProcessors() / 2)
    }
)

private fun String?.parseIntOrDefault(defaultValue: Int): Int = this?.toIntOrNull() ?: defaultValue

private fun logTestResultsToGitHubActions(desc: TestDescriptor, result: TestResult) {
    if (!ciBuild) return

    val elapsed = (result.endTime - result.startTime).milliseconds

    val tests = result.testCount
    val passed = result.successfulTestCount
    val failed = result.failedTestCount
    val skipped = result.skippedTestCount

    // Gradle Test Run :AnkiDroid:testPlayDebugUnitTest returned SUCCESS in 5m 30s
    val markdownSummary = """
                        |${desc.displayName} returned **${result.resultType}** in $elapsed
                        || Tests | Passed | Failed | Skipped |
                        ||-------|--------|--------|---------|
                        || $tests| $passed| $failed| $skipped|
                        |----
                    """.trimMargin()

    appendToGitHubActionsSummary(markdownSummary)
}

private fun appendToGitHubActionsSummary(message: String) {
    if (!ciBuild) return
    val summaryPath = System.getenv("GITHUB_STEP_SUMMARY") ?: return
    Files.writeString(
        Paths.get(summaryPath),
        message,
        StandardOpenOption.CREATE,
        StandardOpenOption.APPEND
    )
}