//
//  DeviceModelNameResolver.swift
//  suixinkan
//
//  将 utsname 硬件标识符映射为用户可读的设备型号名称。
//

import Foundation
import UIKit

/// 设备硬件标识符到市场型号名称的解析器。
enum DeviceModelNameResolver {
    /// 返回当前设备的可读型号名称，如「iPhone X」。
    static func marketingName() -> String {
        marketingName(forHardwareIdentifier: hardwareIdentifier())
    }

    /// 将硬件标识符解析为可读型号名称。
    static func marketingName(forHardwareIdentifier identifier: String) -> String {
        if let name = identifierMap[identifier] {
            return name
        }
        return fallbackName(for: identifier)
    }

    /// 读取当前设备硬件标识符，模拟器优先使用 SIMULATOR_MODEL_IDENTIFIER。
    static func hardwareIdentifier() -> String {
        #if targetEnvironment(simulator)
        if let simulatorIdentifier = ProcessInfo.processInfo.environment["SIMULATOR_MODEL_IDENTIFIER"],
           !simulatorIdentifier.isEmpty {
            return simulatorIdentifier
        }
        #endif

        var systemInfo = utsname()
        uname(&systemInfo)
        return withUnsafePointer(to: &systemInfo.machine) {
            $0.withMemoryRebound(to: CChar.self, capacity: 1) {
                String(cString: $0)
            }
        }
    }

    /// 未收录的新机型回退为「iPhone / iPad / iPod touch」，避免展示 iPhone12,1 等内部代号。
    private static func fallbackName(for identifier: String) -> String {
        if identifier.hasPrefix("iPhone") {
            return "iPhone"
        }
        if identifier.hasPrefix("iPad") {
            return "iPad"
        }
        if identifier.hasPrefix("iPod") {
            return "iPod touch"
        }
        let localized = UIDevice.current.localizedModel.trimmingCharacters(in: .whitespacesAndNewlines)
        return localized.isEmpty ? "iPhone" : localized
    }

    /// Apple 硬件标识符与市场型号对照表。
    private static let identifierMap: [String: String] = [
        // iPhone
        "iPhone9,1": "iPhone 7",
        "iPhone9,3": "iPhone 7",
        "iPhone9,2": "iPhone 7 Plus",
        "iPhone9,4": "iPhone 7 Plus",
        "iPhone10,1": "iPhone 8",
        "iPhone10,4": "iPhone 8",
        "iPhone10,2": "iPhone 8 Plus",
        "iPhone10,5": "iPhone 8 Plus",
        "iPhone10,3": "iPhone X",
        "iPhone10,6": "iPhone X",
        "iPhone11,2": "iPhone XS",
        "iPhone11,4": "iPhone XS Max",
        "iPhone11,6": "iPhone XS Max",
        "iPhone11,8": "iPhone XR",
        "iPhone12,1": "iPhone 11",
        "iPhone12,3": "iPhone 11 Pro",
        "iPhone12,5": "iPhone 11 Pro Max",
        "iPhone12,8": "iPhone SE (2nd generation)",
        "iPhone13,1": "iPhone 12 mini",
        "iPhone13,2": "iPhone 12",
        "iPhone13,3": "iPhone 12 Pro",
        "iPhone13,4": "iPhone 12 Pro Max",
        "iPhone14,4": "iPhone 13 mini",
        "iPhone14,5": "iPhone 13",
        "iPhone14,2": "iPhone 13 Pro",
        "iPhone14,3": "iPhone 13 Pro Max",
        "iPhone14,6": "iPhone SE (3rd generation)",
        "iPhone14,7": "iPhone 14",
        "iPhone14,8": "iPhone 14 Plus",
        "iPhone15,2": "iPhone 14 Pro",
        "iPhone15,3": "iPhone 14 Pro Max",
        "iPhone15,4": "iPhone 15",
        "iPhone15,5": "iPhone 15 Plus",
        "iPhone16,1": "iPhone 15 Pro",
        "iPhone16,2": "iPhone 15 Pro Max",
        "iPhone17,3": "iPhone 16",
        "iPhone17,4": "iPhone 16 Plus",
        "iPhone17,1": "iPhone 16 Pro",
        "iPhone17,2": "iPhone 16 Pro Max",
        "iPhone17,5": "iPhone 16e",
        // iPad（少量常见型号，避免误连 iPad 时展示内部代号）
        "iPad13,18": "iPad (10th generation)",
        "iPad13,19": "iPad (10th generation)",
        "iPad14,1": "iPad mini (6th generation)",
        "iPad14,2": "iPad mini (6th generation)",
        "iPad13,1": "iPad Air (4th generation)",
        "iPad13,2": "iPad Air (4th generation)",
        "iPad13,16": "iPad Air (5th generation)",
        "iPad13,17": "iPad Air (5th generation)",
        "iPad8,1": "iPad Pro 11-inch",
        "iPad8,2": "iPad Pro 11-inch",
        "iPad8,3": "iPad Pro 11-inch",
        "iPad8,4": "iPad Pro 11-inch",
        "iPad8,5": "iPad Pro 12.9-inch",
        "iPad8,6": "iPad Pro 12.9-inch",
        "iPad8,7": "iPad Pro 12.9-inch",
        "iPad8,8": "iPad Pro 12.9-inch"
    ]
}