/**
 * XuqmGroup Update Service — Android Gradle Release Task
 *
 * Copy this file to your app module directory and apply it:
 *   apply(from = "xuqm_release.gradle.kts")
 *
 * Then run:
 *   ./gradlew xuqmRelease
 *
 * Config: xuqm.properties in the project root (or module root)
 * ---
 * xuqm.serverUrl=https://update.dev.xuqinmin.com
 * xuqm.appId=your-app-id
 * xuqm.apiToken=your-api-token
 * ---
 *
 * The task:
 *   1. Reads versionName / versionCode from the android extension
 *   2. Checks the latest version on the update server
 *   3. Aborts if the local versionCode is not greater than the server's
 *   4. Assembles the release APK (assembleRelease)
 *   5. Uploads the APK + metadata to the update service as a DRAFT
 *   6. Optionally triggers server-side store submission
 */

import org.gradle.api.DefaultTask
import org.gradle.api.GradleException
import org.gradle.api.tasks.TaskAction
import java.io.File
import java.net.URI
import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse
import java.nio.file.Files
import java.util.Properties
import java.util.UUID

// ── Config loading ────────────────────────────────────────────────────────

fun loadXuqmConfig(projectDir: File): Properties {
    val props = Properties()
    listOf(
        File(projectDir, "xuqm.properties"),
        File(projectDir.parentFile, "xuqm.properties"),
    ).firstOrNull { it.exists() }?.inputStream()?.use(props::load)
        ?: throw GradleException("xuqm.properties not found in module or project root")
    return props
}

// ── HTTP helper ───────────────────────────────────────────────────────────

fun httpGet(url: String, token: String): String {
    val client = HttpClient.newHttpClient()
    val req = HttpRequest.newBuilder(URI.create(url))
        .header("Authorization", "Bearer $token")
        .GET().build()
    return client.send(req, HttpResponse.BodyHandlers.ofString()).body()
}

/**
 * Multipart POST — minimal implementation without external dependencies.
 * Returns response body string.
 */
fun httpMultipartPost(url: String, token: String, parts: Map<String, Any>): String {
    val boundary = UUID.randomUUID().toString()
    val baos = java.io.ByteArrayOutputStream()

    fun writeln(s: String) = baos.write(("$s\r\n").toByteArray())

    for ((name, value) in parts) {
        writeln("--$boundary")
        when (value) {
            is File -> {
                writeln("Content-Disposition: form-data; name=\"$name\"; filename=\"${value.name}\"")
                writeln("Content-Type: application/octet-stream")
                writeln("")
                baos.write(value.readBytes())
                writeln("")
            }
            else -> {
                writeln("Content-Disposition: form-data; name=\"$name\"")
                writeln("")
                writeln(value.toString())
            }
        }
    }
    writeln("--$boundary--")

    val body = baos.toByteArray()
    val client = HttpClient.newHttpClient()
    val req = HttpRequest.newBuilder(URI.create(url))
        .header("Authorization", "Bearer $token")
        .header("Content-Type", "multipart/form-data; boundary=$boundary")
        .POST(HttpRequest.BodyPublishers.ofByteArray(body))
        .build()
    return client.send(req, HttpResponse.BodyHandlers.ofString()).body()
}

fun parseJson(json: String, key: String): String? =
    Regex("\"$key\"\\s*:\\s*\"([^\"]+)\"").find(json)?.groupValues?.get(1)
fun parseJsonInt(json: String, key: String): Int? =
    Regex("\"$key\"\\s*:\\s*(\\d+)").find(json)?.groupValues?.get(1)?.toIntOrNull()

// ── Task registration ─────────────────────────────────────────────────────

tasks.register("xuqmRelease") {
    group = "xuqm"
    description = "Build release APK and upload to XuqmGroup Update Service"

    // Ensure assembleRelease runs first
    dependsOn("assembleRelease")

    doLast {
        val cfg = loadXuqmConfig(projectDir)
        val serverUrl  = cfg.getProperty("xuqm.serverUrl") ?: throw GradleException("xuqm.serverUrl missing")
        val appId      = cfg.getProperty("xuqm.appId")     ?: throw GradleException("xuqm.appId missing")
        val apiToken   = cfg.getProperty("xuqm.apiToken")  ?: throw GradleException("xuqm.apiToken missing")
        val storeTargets = cfg.getProperty("xuqm.storeTargets", "")  // e.g. "HUAWEI,MI,OPPO"
        val autoPublish  = cfg.getProperty("xuqm.autoPublishAfterReview", "false").toBoolean()
        val scheduledAt  = cfg.getProperty("xuqm.scheduledPublishAt", "")
        val webhookUrl   = cfg.getProperty("xuqm.webhookUrl", "")

        // ── 1. Read local version ──────────────────────────────────────────
        val android = project.extensions.findByName("android")
            ?: throw GradleException("This task must run in an Android module")
        val defaultConfig = android::class.java.getMethod("getDefaultConfig").invoke(android)
        val versionName = defaultConfig::class.java.getMethod("getVersionName").invoke(defaultConfig) as? String
            ?: throw GradleException("versionName not set")
        val versionCode = (defaultConfig::class.java.getMethod("getVersionCode").invoke(defaultConfig) as? Int)
            ?: throw GradleException("versionCode not set")
        val applicationId = defaultConfig::class.java.getMethod("getApplicationId").invoke(defaultConfig) as? String ?: ""
        println("[xuqm] Local version: $versionName ($versionCode), packageName: $applicationId")

        // ── 2. Check server latest ─────────────────────────────────────────
        val listResp = httpGet("$serverUrl/api/v1/updates/app/list?appId=$appId&platform=ANDROID", apiToken)
        // Find highest published versionCode
        val serverVersionCode = Regex("\"versionCode\"\\s*:\\s*(\\d+)").findAll(listResp)
            .mapNotNull { it.groupValues[1].toIntOrNull() }
            .maxOrNull() ?: 0
        println("[xuqm] Server latest versionCode: $serverVersionCode")

        if (versionCode <= serverVersionCode) {
            throw GradleException(
                "[xuqm] Local versionCode ($versionCode) must be greater than server ($serverVersionCode). " +
                "Please bump versionCode in build.gradle.kts before releasing."
            )
        }

        // ── 3. Locate APK ─────────────────────────────────────────────────
        val apkDir = File(buildDir, "outputs/apk/release")
        val apkFile = apkDir.listFiles { f -> f.extension == "apk" }?.firstOrNull()
            ?: throw GradleException("No APK found in ${apkDir.absolutePath}. Did assembleRelease succeed?")
        println("[xuqm] APK: ${apkFile.absolutePath}")

        // ── 4. Upload to update service ───────────────────────────────────
        val parts = mutableMapOf<String, Any>(
            "appId"       to appId,
            "platform"    to "ANDROID",
            "versionName" to versionName,
            "versionCode" to versionCode,
            "forceUpdate" to "false",
            "autoPublishAfterReview" to autoPublish.toString(),
            "apkFile"     to apkFile,
        )
        if (applicationId.isNotBlank()) parts["packageName"] = applicationId
        if (storeTargets.isNotBlank()) parts["storeSubmitTargets"] = "[\"${storeTargets.split(",").joinToString("\",\"")}\"]"
        if (scheduledAt.isNotBlank()) parts["scheduledPublishAt"] = scheduledAt
        if (webhookUrl.isNotBlank())  parts["webhookUrl"] = webhookUrl

        println("[xuqm] Uploading APK...")
        val uploadResp = httpMultipartPost("$serverUrl/api/v1/updates/app/upload", apiToken, parts)
        val versionId = parseJson(uploadResp, "id")
            ?: throw GradleException("[xuqm] Upload failed:\n$uploadResp")
        println("[xuqm] Uploaded, version ID: $versionId")

        // ── 5. Trigger server-side store submission ────────────────────────
        if (storeTargets.isNotBlank()) {
            println("[xuqm] Triggering store submission: $storeTargets ...")
            val storeBody = """{"storeTypes":[${storeTargets.split(",").joinToString(",") { "\"$it\"" }}]}"""
            val client = HttpClient.newHttpClient()
            val req = HttpRequest.newBuilder(URI.create("$serverUrl/api/v1/updates/store/app/$versionId/execute-submit"))
                .header("Authorization", "Bearer $apiToken")
                .header("Content-Type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(storeBody))
                .build()
            val storeResp = client.send(req, HttpResponse.BodyHandlers.ofString())
            println("[xuqm] Store submission triggered (HTTP ${storeResp.statusCode()})")
        }

        println("[xuqm] Done. Version is in DRAFT state.")
        if (scheduledAt.isNotBlank()) {
            println("[xuqm] Will auto-publish at: $scheduledAt")
        } else if (autoPublish) {
            println("[xuqm] Will auto-publish after all store reviews pass.")
        } else {
            println("[xuqm] Publish manually: POST $serverUrl/api/v1/updates/app/$versionId/publish")
        }
    }
}