import Foundation
import SwiftUI

/// 单个指标的展示样式
enum GaugeDisplayStyle: String, CaseIterable, Identifiable, Codable {
    case bar         // 条状百分比
    case ring        // 圆环进度
    case text        // 纯文本百分比
    case pie         // 扇形小圆盘
    case compact     // 紧凑横条 + 文字

    var id: String { rawValue }

    var displayName: String {
        switch self {
        case .bar:     return "条状百分比"
        case .ring:    return "圆环进度"
        case .text:    return "纯文本"
        case .pie:     return "扇形圆盘"
        case .compact: return "紧凑横条"
        }
    }

    var iconName: String {
        switch self {
        case .bar:     return "rectangle.split.1x2"
        case .ring:    return "circle.dotted"
        case .text:    return "textformat"
        case .pie:     return "chart.pie"
        case .compact: return "rectangle.compress.vertical"
        }
    }
}

/// 模块在窗口中的排列位置
enum ModulePosition: String, CaseIterable, Identifiable, Codable {
    case left   // 左列
    case right  // 右列
    case full   // 全宽（独占一行）

    var id: String { rawValue }

    var displayName: String {
        switch self {
        case .left:  return "左"
        case .right: return "右"
        case .full:  return "全宽"
        }
    }
}

/// 配置管理者：所有用户偏好通过 UserDefaults 持久化
final class Configuration: ObservableObject {
    static let shared = Configuration()

    @Published var cpuStyle: GaugeDisplayStyle {
        didSet { save("cpuStyle", cpuStyle.rawValue) }
    }
    @Published var gpuStyle: GaugeDisplayStyle {
        didSet { save("gpuStyle", gpuStyle.rawValue) }
    }
    @Published var memoryStyle: GaugeDisplayStyle {
        didSet { save("memoryStyle", memoryStyle.rawValue) }
    }
    @Published var swapStyle: GaugeDisplayStyle {
        didSet { save("swapStyle", swapStyle.rawValue) }
    }

    @Published var showCPU: Bool {
        didSet { save("showCPU", showCPU) }
    }
    @Published var showGPU: Bool {
        didSet { save("showGPU", showGPU) }
    }
    @Published var showMemory: Bool {
        didSet { save("showMemory", showMemory) }
    }
    @Published var showSwap: Bool {
        didSet { save("showSwap", showSwap) }
    }
    @Published var showTopProcesses: Bool {
        didSet { save("showTopProcesses", showTopProcesses) }
    }

    @Published var processCount: Int {
        didSet { save("processCount", processCount) }
    }
    @Published var refreshInterval: Double {
        didSet { save("refreshInterval", refreshInterval) }
    }
    @Published var opacity: Double {
        didSet { save("opacity", opacity) }
    }
    @Published var fontSize: Double {
        didSet { save("fontSize", fontSize) }
    }
    @Published var windowWidth: Double {
        didSet { save("windowWidth", windowWidth) }
    }
    @Published var windowHeight: Double {
        didSet { save("windowHeight", windowHeight) }
    }

    @Published var cpuPos: ModulePosition {
        didSet { save("cpuPos", cpuPos.rawValue) }
    }
    @Published var gpuPos: ModulePosition {
        didSet { save("gpuPos", gpuPos.rawValue) }
    }
    @Published var memoryPos: ModulePosition {
        didSet { save("memoryPos", memoryPos.rawValue) }
    }
    @Published var swapPos: ModulePosition {
        didSet { save("swapPos", swapPos.rawValue) }
    }
    @Published var processesPos: ModulePosition {
        didSet { save("processesPos", processesPos.rawValue) }
    }

    // 行号：决定模块在垂直方向上的排列顺序（1-10）
    @Published var cpuRow: Int {
        didSet { save("cpuRow", cpuRow) }
    }
    @Published var gpuRow: Int {
        didSet { save("gpuRow", gpuRow) }
    }
    @Published var memoryRow: Int {
        didSet { save("memoryRow", memoryRow) }
    }
    @Published var swapRow: Int {
        didSet { save("swapRow", swapRow) }
    }
    @Published var processesRow: Int {
        didSet { save("processesRow", processesRow) }
    }

    private init() {
        let defaults = UserDefaults.standard

        cpuStyle    = GaugeDisplayStyle(rawValue: defaults.string(forKey: "cpuStyle") ?? "ring") ?? .ring
        gpuStyle    = GaugeDisplayStyle(rawValue: defaults.string(forKey: "gpuStyle") ?? "ring") ?? .ring
        memoryStyle = GaugeDisplayStyle(rawValue: defaults.string(forKey: "memoryStyle") ?? "bar") ?? .bar
        swapStyle   = GaugeDisplayStyle(rawValue: defaults.string(forKey: "swapStyle") ?? "bar") ?? .bar

        showCPU          = defaults.object(forKey: "showCPU") as? Bool ?? true
        showGPU          = defaults.object(forKey: "showGPU") as? Bool ?? true
        showMemory       = defaults.object(forKey: "showMemory") as? Bool ?? true
        showSwap         = defaults.object(forKey: "showSwap") as? Bool ?? true
        showTopProcesses = defaults.object(forKey: "showTopProcesses") as? Bool ?? true

        processCount    = defaults.object(forKey: "processCount") as? Int ?? 5
        refreshInterval = defaults.object(forKey: "refreshInterval") as? Double ?? 1.5
        opacity         = defaults.object(forKey: "opacity") as? Double ?? 1.0
        fontSize        = defaults.object(forKey: "fontSize") as? Double ?? 12
        windowWidth     = defaults.object(forKey: "windowWidth") as? Double ?? 250
        windowHeight    = defaults.object(forKey: "windowHeight") as? Double ?? 300

        cpuPos       = ModulePosition(rawValue: defaults.string(forKey: "cpuPos") ?? "full") ?? .full
        gpuPos       = ModulePosition(rawValue: defaults.string(forKey: "gpuPos") ?? "full") ?? .full
        memoryPos    = ModulePosition(rawValue: defaults.string(forKey: "memoryPos") ?? "full") ?? .full
        swapPos      = ModulePosition(rawValue: defaults.string(forKey: "swapPos") ?? "full") ?? .full
        processesPos = ModulePosition(rawValue: defaults.string(forKey: "processesPos") ?? "full") ?? .full

        cpuRow       = defaults.object(forKey: "cpuRow") as? Int ?? 1
        gpuRow       = defaults.object(forKey: "gpuRow") as? Int ?? 2
        memoryRow    = defaults.object(forKey: "memoryRow") as? Int ?? 3
        swapRow      = defaults.object(forKey: "swapRow") as? Int ?? 4
        processesRow = defaults.object(forKey: "processesRow") as? Int ?? 5
    }

    private func save(_ key: String, _ value: Any) {
        UserDefaults.standard.set(value, forKey: key)
    }
}