import SwiftUI
import SwiftData

@main
struct HealthProbeApp: App {
    @State private var appSettings = AppSettings()

    var sharedModelContainer: ModelContainer = {
        do {
            return try createModelContainer()
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(appSettings)
        }
        .modelContainer(sharedModelContainer)
    }

    // Two separate ModelConfiguration instances:
    //   cloudConfig - audit data
    //   localConfig - local-only settings and operation metadata
    //
    // ⚠️ DeviceProfile is kept local-only (not synced to CloudKit) since it's device-specific
    //    cosmetic data (name, color tag) that should not cross devices.
    private static func createModelContainer() throws -> ModelContainer {
        let fullSchema = Schema([
            HealthSnapshot.self, TypeCount.self, YearlyCount.self, HealthRecord.self, TypeDistributionBin.self,
            SnapshotDelta.self, TypeDelta.self, AnomalyRecord.self,
            OperationLog.self, DeviceProfile.self, MetricTimeoutProfile.self,
        ])

        let appSupportURL = URL.applicationSupportDirectory
        try FileManager.default.createDirectory(at: appSupportURL, withIntermediateDirectories: true)
        let cloudStoreURL = appSupportURL.appending(path: "HealthProbeRecords.store")

        let cloudKitModels = Schema([
            HealthSnapshot.self, TypeCount.self, YearlyCount.self, HealthRecord.self, TypeDistributionBin.self,
            SnapshotDelta.self, TypeDelta.self, AnomalyRecord.self,
        ])
        let localModels = Schema([OperationLog.self, DeviceProfile.self, MetricTimeoutProfile.self])

        let cloudConfig = ModelConfiguration(
            "cloud",
            schema: cloudKitModels,
            url: cloudStoreURL,
            cloudKitDatabase: .none
        )
        let localConfig = ModelConfiguration(
            "local",
            schema: localModels,
            url: appSupportURL.appending(path: "HealthProbeLocal.store"),
            cloudKitDatabase: .none
        )

        do {
            return try ModelContainer(for: fullSchema, configurations: [cloudConfig, localConfig])
        } catch {
            let candidates: [URL] = [
                cloudStoreURL,
                appSupportURL.appending(path: "HealthProbeRecords.store.shm"),
                appSupportURL.appending(path: "HealthProbeRecords.store.wal"),
                appSupportURL.appending(path: "HealthProbeCloud.store"),
                appSupportURL.appending(path: "HealthProbeCloud.store.shm"),
                appSupportURL.appending(path: "HealthProbeCloud.store.wal"),
                appSupportURL.appending(path: "HealthProbeLocal.store"),
                appSupportURL.appending(path: "HealthProbeLocal.store.shm"),
                appSupportURL.appending(path: "HealthProbeLocal.store.wal"),
            ]
            for url in candidates { try? FileManager.default.removeItem(at: url) }
            return try ModelContainer(for: fullSchema, configurations: [cloudConfig, localConfig])
        }
    }
}
