import SwiftUI
import ZxDocumentRuntime

/// Minimal demo app to verify zhixi-document-runtime integration.
@main
struct MaterialReaderDemo: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

struct ContentView: View {
    @State private var filePath = ""
    @State private var result = ""
    @State private var events: [ReadingEvent] = []

    var body: some View {
        NavigationStack {
            List {
                Section("File Type Detection") {
                    TextField("File path", text: $filePath)
                        .font(.system(size: 14, design: .monospaced))
                    Button("Detect Type") {
                        detect()
                    }
                    if !result.isEmpty {
                        Text(result)
                            .font(.system(size: 14))
                            .foregroundColor(.secondary)
                    }
                }

                Section("Reading Events") {
                    if events.isEmpty {
                        Text("No events yet")
                            .foregroundColor(.secondary)
                    } else {
                        ForEach(0..<events.count, id: \.self) { i in
                            Text("Event \(i): \(String(describing: events[i]))")
                                .font(.system(size: 12, design: .monospaced))
                        }
                    }
                    Button("Simulate Reading Session") {
                        simulateReading()
                    }
                }
            }
            .navigationTitle("MaterialReader Demo")
        }
    }

    func detect() {
        guard !filePath.isEmpty else {
            result = "Enter a file path"
            return
        }
        do {
            let type = try detectMaterialType(filePath: filePath)
            result = "Detected: \(type)"
        } catch {
            result = "Error: \(error)"
        }
    }

    func simulateReading() {
        let now = Int64(Date().timeIntervalSince1970 * 1000)
        events = [
            ReadingEvent.materialOpened(materialId: "demo-1", timestampMs: now),
            ReadingEvent.heartbeat(materialId: "demo-1", activeSeconds: 15, position: nil, timestampMs: now + 15000),
            ReadingEvent.materialClosed(materialId: "demo-1", timestampMs: now + 30000, activeSeconds: 30),
        ]
    }
}