import UIKit
import HardwareC

// Known corner radius values for iOS devices (used on simulator)
private let deviceCornerRadii: [String: Double] = [
    // 39.0 - iPhone X, Xs, Xs Max, 11 Pro, 11 Pro Max
    "iPhone10,3": 39.0, "iPhone10,6": 39.0,  // iPhone X
    "iPhone11,2": 39.0,  // iPhone Xs
    "iPhone11,4": 39.0, "iPhone11,6": 39.0,  // iPhone Xs Max
    "iPhone12,3": 39.0,  // iPhone 11 Pro
    "iPhone12,5": 39.0,  // iPhone 11 Pro Max

    // 41.5 - iPhone Xr, 11
    "iPhone11,8": 41.5,  // iPhone Xr
    "iPhone12,1": 41.5,  // iPhone 11

    // 44.0 - iPhone 12 mini, 13 mini
    "iPhone13,1": 44.0,  // iPhone 12 mini
    "iPhone14,4": 44.0,  // iPhone 13 mini

    // 47.33 - iPhone 12, 12 Pro, 13, 13 Pro, 14, 16e
    "iPhone13,2": 47.33,  // iPhone 12
    "iPhone13,3": 47.33,  // iPhone 12 Pro
    "iPhone14,5": 47.33,  // iPhone 13
    "iPhone14,2": 47.33,  // iPhone 13 Pro
    "iPhone14,7": 47.33,  // iPhone 14
    "iPhone17,5": 47.33,  // iPhone 16e

    // 53.33 - iPhone 12 Pro Max, 13 Pro Max, 14 Plus
    "iPhone13,4": 53.33,  // iPhone 12 Pro Max
    "iPhone14,3": 53.33,  // iPhone 13 Pro Max
    "iPhone14,8": 53.33,  // iPhone 14 Plus

    // 55.0 - iPhone 14 Pro, 14 Pro Max, 15, 15 Plus, 15 Pro, 15 Pro Max, 16, 16 Plus
    "iPhone15,2": 55.0,  // iPhone 14 Pro
    "iPhone15,3": 55.0,  // iPhone 14 Pro Max
    "iPhone15,4": 55.0,  // iPhone 15
    "iPhone15,5": 55.0,  // iPhone 15 Plus
    "iPhone16,1": 55.0,  // iPhone 15 Pro
    "iPhone16,2": 55.0,  // iPhone 15 Pro Max
    "iPhone17,1": 55.0,  // iPhone 16
    "iPhone17,2": 55.0,  // iPhone 16 Plus

    // 62.0 - iPhone 16 Pro, 16 Pro Max, 17, 17 Pro, 17 Pro Max, Air
    "iPhone17,3": 62.0,  // iPhone 16 Pro
    "iPhone17,4": 62.0,  // iPhone 16 Pro Max
    "iPhone18,1": 62.0,  // iPhone 17
    "iPhone18,2": 62.0,  // iPhone 17 Pro
    "iPhone18,3": 62.0,  // iPhone 17 Pro Max
    "iPhone18,4": 62.0,  // iPhone Air

    // 18.0 - iPad Air / iPad Pro 11-inch / 12.9-inch
    "iPad8,1": 18.0, "iPad8,2": 18.0, "iPad8,3": 18.0, "iPad8,4": 18.0,  // iPad Pro 11-inch 1st gen
    "iPad8,5": 18.0, "iPad8,6": 18.0, "iPad8,7": 18.0, "iPad8,8": 18.0,  // iPad Pro 12.9-inch 3rd gen
    "iPad8,9": 18.0, "iPad8,10": 18.0,  // iPad Pro 11-inch 2nd gen
    "iPad8,11": 18.0, "iPad8,12": 18.0,  // iPad Pro 12.9-inch 4th gen
    "iPad13,4": 18.0, "iPad13,5": 18.0, "iPad13,6": 18.0, "iPad13,7": 18.0,  // iPad Pro 11-inch 3rd gen
    "iPad13,8": 18.0, "iPad13,9": 18.0, "iPad13,10": 18.0, "iPad13,11": 18.0,  // iPad Pro 12.9-inch 5th gen
    "iPad13,16": 18.0, "iPad13,17": 18.0,  // iPad Air 5th gen
    "iPad14,3": 18.0, "iPad14,4": 18.0,  // iPad Pro 11-inch 4th gen
    "iPad14,5": 18.0, "iPad14,6": 18.0,  // iPad Pro 12.9-inch 6th gen
]

private func getDeviceIdentifier() -> String {
    #if targetEnvironment(simulator)
    // On simulator, use the SIMULATOR_MODEL_IDENTIFIER environment variable
    // uname() returns host architecture (e.g., "arm64") instead of device model
    return ProcessInfo.processInfo.environment["SIMULATOR_MODEL_IDENTIFIER"] ?? ""
    #else
    var systemInfo = utsname()
    uname(&systemInfo)
    let machineMirror = Mirror(reflecting: systemInfo.machine)
    let identifier = machineMirror.children.reduce("") { identifier, element in
        guard let value = element.value as? Int8, value != 0 else { return identifier }
        return identifier + String(UnicodeScalar(UInt8(value)))
    }
    return identifier
    #endif
}

@_cdecl("get_screen_border_radius")
public func getScreenBorderRadius() -> DoubleOption {
    var result = DoubleOption()

    // Use device identifier lookup for both simulator and real devices
    // There is no public API for displayCornerRadius on UIScreen
    let identifier = getDeviceIdentifier()
    if let radius = deviceCornerRadii[identifier] {
        result.value = radius
        result.hasValue = 1
    } else {
        result.value = 0
        result.hasValue = 0
    }

    return result
}