diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b1dff0d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,45 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Kotlin ###
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..a412a08
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,58 @@
+// build.gradle.kts
+
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    kotlin("jvm") version "2.0.0"
+    id("org.jetbrains.compose") version "1.8.0"
+    kotlin("plugin.serialization") version "2.0.0"
+    // ⬇️ 이 줄을 추가해 주세요!
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.0"
+}
+group = "com.example"
+version = "1.0.0"
+
+repositories {
+    google()
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
+}
+
+dependencies {
+    implementation(compose.desktop.currentOs)
+    implementation(compose.materialIconsExtended)
+    // JWT 라이브러리
+    implementation("io.jsonwebtoken:jjwt-api:0.11.5")
+    implementation("io.jsonwebtoken:jjwt-impl:0.11.5")
+    implementation("io.jsonwebtoken:jjwt-jackson:0.11.5")
+
+    // Ktor HTTP 클라이언트
+    implementation("io.ktor:ktor-client-core:2.3.11")
+    implementation("io.ktor:ktor-client-cio:2.3.11")
+    implementation("io.ktor:ktor-client-logging:2.3.11")
+    // ⬇️ Ktor가 JSON을 처리할 수 있도록 도와주는 라이브러리 추가
+    implementation("io.ktor:ktor-client-content-negotiation:2.3.11")
+    implementation("io.ktor:ktor-serialization-kotlinx-json:2.3.11")
+
+    // ⬇️ Kotlinx Serialization 라이브러리 추가
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.0")
+}
+
+kotlin {
+    jvmToolchain(21)
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+}
+
+compose.desktop {
+    application {
+        mainClass = "MainKt"
+        nativeDistributions {
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            packageName = "AnalyticsReportGenerator" // 앱 패키지 이름 변경
+        }
+    }
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..7fc6f1f
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1 @@
+kotlin.code.style=official
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..f228b23
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,4 @@
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+rootProject.name = "untitled"
\ No newline at end of file
diff --git a/src/main/kotlin/Main.kt b/src/main/kotlin/Main.kt
new file mode 100644
index 0000000..4eac89d
--- /dev/null
+++ b/src/main/kotlin/Main.kt
@@ -0,0 +1,388 @@
+// Main.kt
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.*
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.DateRange
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import io.jsonwebtoken.Jwts
+import io.jsonwebtoken.SignatureAlgorithm
+import io.ktor.client.*
+import io.ktor.client.call.*
+import io.ktor.client.engine.cio.*
+import io.ktor.client.plugins.contentnegotiation.*
+import io.ktor.client.plugins.logging.LogLevel
+import io.ktor.client.plugins.logging.Logger
+import io.ktor.client.plugins.logging.Logging
+import io.ktor.client.request.*
+import io.ktor.http.HttpHeaders
+import io.ktor.serialization.kotlinx.json.*
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import java.awt.FileDialog
+import java.awt.Frame
+import java.io.File
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.security.KeyFactory
+import java.security.PrivateKey
+import java.security.spec.PKCS8EncodedKeySpec
+import java.text.NumberFormat
+import java.time.DayOfWeek
+import java.time.Instant
+import java.time.LocalDate
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+import java.time.temporal.TemporalAdjusters
+import java.util.*
+import java.util.prefs.Preferences
+
+// --- 상수 정의 ---
+private const val ISSUER_ID_KEY = "APP_STORE_ISSUER_ID"
+private const val KEY_ID_KEY = "APP_STORE_KEY_ID"
+private const val APP_ID_KEY = "APP_STORE_APP_ID" // Vendor Number 대신 App ID 사용
+
+// --- 데이터 클래스 (JSON 파싱용) ---
+@Serializable
+data class AnalyticsMetric(
+    val data: List<MetricData> = emptyList()
+)
+
+@Serializable
+data class MetricData(
+    val dataPoints: DataPoints
+)
+
+@Serializable
+data class DataPoints(
+    val totals: Totals? = null
+)
+
+@Serializable
+data class Totals(
+    val count: Long? = null
+)
+
+// --- 화면에 표시할 최종 분석 결과 데이터 클래스 ---
+data class AnalyticsResult(
+    val installations: Long = 0,
+    val redownloads: Long = 0,
+    val updates: Long = 0
+)
+
+// --- API 클라이언트 ---
+suspend fun fetchAnalyticsMetric(
+    client: HttpClient,
+    token: String,
+    appId: String,
+    metricType: String,
+    date: String
+): Long {
+    try {
+        val response: AnalyticsMetric = client.get("https://api.appstoreconnect.apple.com/v1/apps/$appId/metrics") {
+            header(HttpHeaders.Authorization, "Bearer $token")
+            parameter("granularity", "DAY")
+            parameter("filter[metricType]", metricType)
+            parameter("filter[days]", date)
+        }.body()
+        return response.data.firstOrNull()?.dataPoints?.totals?.count ?: 0L
+    } catch (e: Exception) {
+        println("Error fetching metric $metricType: ${e.message}")
+        throw e // 오류를 상위로 전파하여 처리
+    }
+}
+
+
+@Composable
+fun SimpleDatePicker(
+    initialDate: LocalDate,
+    onDateSelected: (LocalDate) -> Unit,
+    onDismissRequest: () -> Unit
+) {
+    var displayedYearMonth by remember { mutableStateOf(YearMonth.from(initialDate)) }
+    Dialog(onDismissRequest = onDismissRequest) {
+        Surface(
+            shape = MaterialTheme.shapes.medium,
+            modifier = Modifier.padding(16.dp).widthIn(max = 320.dp),
+            elevation = 8.dp
+        ) {
+            Column(
+                modifier = Modifier.padding(16.dp),
+                horizontalAlignment = Alignment.CenterHorizontally
+            ) {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Button(onClick = { displayedYearMonth = displayedYearMonth.minusMonths(1) }) { Text("<") }
+                    Text(
+                        text = displayedYearMonth.format(DateTimeFormatter.ofPattern("yyyy년 MM월")),
+                        style = MaterialTheme.typography.h6
+                    )
+                    Button(onClick = { displayedYearMonth = displayedYearMonth.plusMonths(1) }) { Text(">") }
+                }
+                Spacer(Modifier.height(16.dp))
+                Row(modifier = Modifier.fillMaxWidth()) {
+                    listOf("일", "월", "화", "수", "목", "금", "토").forEach { day ->
+                        Text(
+                            text = day,
+                            modifier = Modifier.weight(1f),
+                            textAlign = TextAlign.Center,
+                            fontWeight = FontWeight.Bold
+                        )
+                    }
+                }
+                Spacer(Modifier.height(8.dp))
+                val daysInMonth = displayedYearMonth.lengthOfMonth()
+                val firstDayOfMonth = displayedYearMonth.atDay(1)
+                val firstDayOfWeek = firstDayOfMonth.dayOfWeek.value % 7
+                LazyVerticalGrid(
+                    columns = androidx.compose.foundation.lazy.grid.GridCells.Fixed(7),
+                    contentPadding = PaddingValues(vertical = 4.dp)
+                ) {
+                    items(firstDayOfWeek) { Box(Modifier.size(40.dp)) }
+                    items(daysInMonth) { day ->
+                        val date = displayedYearMonth.atDay(day + 1)
+                        val isSelected = date == initialDate
+                        Box(
+                            modifier = Modifier
+                                .size(40.dp)
+                                .clip(CircleShape)
+                                .background(if (isSelected) MaterialTheme.colors.primary else Color.Transparent)
+                                .clickable { onDateSelected(date) },
+                            contentAlignment = Alignment.Center
+                        ) {
+                            Text(
+                                text = "${day + 1}",
+                                color = if (isSelected) MaterialTheme.colors.onPrimary else MaterialTheme.colors.onSurface
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun App(
+    filePath: String,
+    onFilePathChange: (String) -> Unit
+) {
+    var error by remember { mutableStateOf<String?>(null) }
+    val prefs = remember { Preferences.userRoot().node("com.example.analyticsreportgenerator") }
+
+    var issuerId by remember { mutableStateOf(prefs.get(ISSUER_ID_KEY, "")) }
+    var keyId by remember { mutableStateOf(prefs.get(KEY_ID_KEY, "")) }
+    var appId by remember { mutableStateOf(prefs.get(APP_ID_KEY, "")) } // Vendor Number 대신 App ID
+
+    var statusMessage by remember { mutableStateOf("분석할 앱의 정보를 입력하고 날짜를 선택하세요.") }
+    var analyticsResult by remember { mutableStateOf<AnalyticsResult?>(null) }
+
+    val scope = rememberCoroutineScope()
+    val dailyFormat = DateTimeFormatter.ISO_LOCAL_DATE
+    var reportDate by remember { mutableStateOf(LocalDate.now().minusDays(2)) }
+    var showDatePicker by remember { mutableStateOf(false) }
+
+    val client = remember {
+        HttpClient(CIO) {
+            install(Logging) {
+                logger = object : Logger {
+                    override fun log(message: String) {
+                        println("===== KTOR API LOG =====\n$message\n========================")
+                    }
+                }
+                level = LogLevel.ALL
+            }
+            // JSON 파싱을 위한 ContentNegotiation 플러그인 설치
+            install(ContentNegotiation) {
+                json(Json {
+                    ignoreUnknownKeys = true // API 응답에 모르는 필드가 있어도 무시
+                })
+            }
+        }
+    }
+    DisposableEffect(Unit) { onDispose { client.close() } }
+    val privateKey: PrivateKey? by remember(filePath) { derivedStateOf { if (filePath.isNotBlank()) { try { error = null; loadPrivateKey(filePath) } catch (e: Exception) { error = "개인키 파일 로드 실패: ${e.message}"; null } } else { null } } }
+    fun isReady(): Boolean {
+        if (privateKey == null) { error = "개인키 파일(.p8)을 선택하세요."; return false }
+        if (issuerId.isBlank() || keyId.isBlank()) { error = "Issuer ID와 Key ID를 입력하세요."; return false }
+        if (appId.isBlank()) { error = "분석을 위해 App ID를 입력하세요."; return false }
+        error = null; return true
+    }
+
+    if (showDatePicker) {
+        SimpleDatePicker(
+            initialDate = reportDate,
+            onDismissRequest = { showDatePicker = false },
+            onDateSelected = { date ->
+                reportDate = date
+                showDatePicker = false
+            }
+        )
+    }
+
+    Row(modifier = Modifier.fillMaxSize()) {
+        Column(modifier = Modifier.width(350.dp).fillMaxHeight().verticalScroll(rememberScrollState()).padding(16.dp)) {
+            Text("Issuer ID"); TextField(value = issuerId, onValueChange = {issuerId = it; prefs.put(ISSUER_ID_KEY, it)}, singleLine = true, modifier = Modifier.fillMaxWidth()); Spacer(Modifier.height(8.dp))
+            Text("Key ID"); TextField(value = keyId, onValueChange = {keyId = it; prefs.put(KEY_ID_KEY, it)}, singleLine = true, modifier = Modifier.fillMaxWidth()); Spacer(Modifier.height(8.dp))
+            Text("App ID (앱 고유 ID)"); TextField(value = appId, onValueChange = {appId = it; prefs.put(APP_ID_KEY, it)}, singleLine = true, modifier = Modifier.fillMaxWidth()); Spacer(Modifier.height(8.dp))
+
+            Text("개인키(.p8) 파일 (버튼을 클릭하여 파일 선택)")
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                TextField(value = filePath, onValueChange = onFilePathChange, singleLine = true, modifier = Modifier.weight(1f), readOnly = true)
+                Spacer(Modifier.width(8.dp))
+                Button(onClick = {
+                    val dialog = FileDialog(Frame(), "개인키(.p8) 파일을 선택하세요", FileDialog.LOAD).apply {
+                        setFile("*.p8")
+                        isVisible = true
+                    }
+                    if (dialog.directory != null && dialog.file != null) {
+                        onFilePathChange(dialog.directory + dialog.file)
+                    }
+                }) { Text("찾기...") }
+            }
+
+            Divider(modifier = Modifier.padding(vertical = 16.dp))
+
+            Text("조회 날짜 (YYYY-MM-DD)")
+            Box(modifier = Modifier.clickable { showDatePicker = true }) {
+                OutlinedTextField(
+                    value = reportDate.format(dailyFormat), onValueChange = { }, readOnly = true, modifier = Modifier.fillMaxWidth(),
+                    trailingIcon = { Icon(imageVector = Icons.Default.DateRange, contentDescription = "날짜 선택") },
+                    enabled = false,
+                    colors = TextFieldDefaults.outlinedTextFieldColors(
+                        disabledTextColor = LocalContentColor.current.copy(LocalContentAlpha.current),
+                        disabledBorderColor = MaterialTheme.colors.onSurface.copy(alpha = ContentAlpha.disabled),
+                        disabledLabelColor = MaterialTheme.colors.onSurface.copy(ContentAlpha.medium),
+                        disabledTrailingIconColor = MaterialTheme.colors.onSurface.copy(alpha = TextFieldDefaults.IconOpacity)
+                    )
+                )
+            }
+            Spacer(Modifier.height(16.dp))
+            Button(
+                onClick = {
+                    if (!isReady()) return@Button
+                    scope.launch {
+                        try {
+                            analyticsResult = null
+                            val dateString = reportDate.format(dailyFormat)
+                            statusMessage = "[$dateString] 앱 분석 데이터 로딩 중..."
+                            error = null
+                            val reportToken = createJWT(privateKey!!, issuerId, keyId, listOf("GET:/v1/apps/$appId/metrics"))
+
+                            // 3가지 메트릭을 동시에 요청 (병렬 처리)
+                            coroutineScope {
+                                val installsDeferred = async { fetchAnalyticsMetric(client, reportToken, appId, "INSTALLATIONS", dateString) }
+                                val redownloadsDeferred = async { fetchAnalyticsMetric(client, reportToken, appId, "REDOWNLOADS", dateString) }
+                                val updatesDeferred = async { fetchAnalyticsMetric(client, reportToken, appId, "UPDATES", dateString) }
+
+                                analyticsResult = AnalyticsResult(
+                                    installations = installsDeferred.await(),
+                                    redownloads = redownloadsDeferred.await(),
+                                    updates = updatesDeferred.await()
+                                )
+                            }
+                            statusMessage = "[$dateString] 분석 완료"
+                        } catch (e: Exception) {
+                            println("===== 작업 실패 ====="); e.printStackTrace(); error = "작업 오류: ${e.message}"; statusMessage = "오류: ${e.message}"
+                        }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth(), enabled = privateKey != null
+            ) { Text("앱 분석 통계 조회") }
+            Spacer(Modifier.height(16.dp))
+            if (error != null) { Text(text = error ?: "", color = Color.Red, modifier = Modifier.padding(top = 8.dp)) }
+        }
+        Divider(modifier = Modifier.fillMaxHeight().width(1.dp))
+
+        ReportView(
+            modifier = Modifier.weight(1f).fillMaxHeight(),
+            result = analyticsResult,
+            statusMessage = statusMessage
+        )
+    }
+}
+
+@Composable
+fun ReportView(
+    modifier: Modifier = Modifier,
+    result: AnalyticsResult?,
+    statusMessage: String
+) {
+    Column(modifier.padding(16.dp)) {
+        Text(
+            text = statusMessage,
+            style = MaterialTheme.typography.subtitle1,
+            color = MaterialTheme.colors.onSurface.copy(alpha = 0.7f),
+            modifier = Modifier.padding(bottom = 16.dp)
+        )
+        if (result != null) {
+            Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
+                AnalyticsCard("최초 설치 (Installations)", result.installations, MaterialTheme.colors.primary)
+                AnalyticsCard("재다운로드 (Re-downloads)", result.redownloads, Color(0xFF00897B))
+                AnalyticsCard("업데이트 (Updates)", result.updates, Color(0xFF5E35B1))
+            }
+        } else {
+            Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                Text("표시할 데이터가 없습니다.", color = Color.Gray)
+            }
+        }
+    }
+}
+
+@Composable
+fun AnalyticsCard(title: String, value: Long, color: Color) {
+    Card(elevation = 4.dp, modifier = Modifier.fillMaxWidth()) {
+        Column(Modifier.padding(16.dp)) {
+            Text(title, style = MaterialTheme.typography.h6)
+            Spacer(Modifier.height(8.dp))
+            Text(
+                text = NumberFormat.getInstance().format(value),
+                style = MaterialTheme.typography.h4.copy(fontWeight = FontWeight.Bold),
+                color = color
+            )
+        }
+    }
+}
+
+fun loadPrivateKey(path: String): PrivateKey {
+    val keyBytes = Files.readAllBytes(Paths.get(path)); val keyPem = String(keyBytes).replace("-----BEGIN PRIVATE KEY-----", "").replace("-----END PRIVATE KEY-----", "").replace("\\s".toRegex(), ""); val decoded = Base64.getDecoder().decode(keyPem); val keySpec = PKCS8EncodedKeySpec(decoded); val kf = KeyFactory.getInstance("EC"); return kf.generatePrivate(keySpec)
+}
+
+fun createJWT(privateKey: PrivateKey, issuerId: String, keyId: String, scope: List<String>?): String {
+    val now = Instant.now(); val expire = now.plusSeconds(20 * 60); val builder = Jwts.builder().setHeaderParam("alg", "ES256").setHeaderParam("kid", keyId).setHeaderParam("typ", "JWT").setIssuer(issuerId).setAudience("appstoreconnect-v1").setIssuedAt(Date.from(now)).setExpiration(Date.from(expire)); if (!scope.isNullOrEmpty()) { builder.claim("scope", scope) }; return builder.signWith(privateKey, SignatureAlgorithm.ES256).compact()
+}
+
+fun main() = application {
+    var filePath by remember { mutableStateOf("") }
+    Window(onCloseRequest = ::exitApplication, title = "App Analytics 리포트 생성기") {
+        MaterialTheme {
+            App(
+                filePath = filePath,
+                onFilePathChange = { filePath = it }
+            )
+        }
+    }
+}
\ No newline at end of file