import SwiftUI

#if canImport(UIKit)
  import UIKit
#elseif canImport(AppKit)
  import AppKit
#endif

private enum AIPalette {
  #if canImport(UIKit)
    private static func dynamicColor(light: UIColor, dark: UIColor) -> Color {
      Color(
        UIColor { traits in
          traits.userInterfaceStyle == .dark ? dark : light
        })
    }

    private static func rgba(
      _ red: CGFloat,
      _ green: CGFloat,
      _ blue: CGFloat,
      _ alpha: CGFloat
    ) -> UIColor {
      UIColor(red: red / 255, green: green / 255, blue: blue / 255, alpha: alpha)
    }

    private static func color(light: UIColor, dark: UIColor) -> Color {
      dynamicColor(light: light, dark: dark)
    }

    // 中性石墨灰阶：所有中性色严格 R=G=B，既不冷到读出蓝，也不暖到读出米色；主色让位给
    // 黑/白，颜色只用来表达状态。原先 B 比 R 高 3~10 级，浅色下大面积文字与描边会蒙一层冷调。
    static let canvas = color(light: rgba(245, 245, 245, 1), dark: rgba(10, 10, 10, 1))
    static let surface = color(light: rgba(255, 255, 255, 1), dark: rgba(21, 21, 21, 1))
    static let surfaceRaised = color(light: rgba(255, 255, 255, 1), dark: rgba(29, 29, 29, 1))
    static let control = color(light: rgba(239, 239, 239, 1), dark: rgba(39, 39, 39, 1))
    static let tile = color(light: rgba(247, 247, 247, 1), dark: rgba(255, 255, 255, 0.055))
    static let tileLine = color(light: rgba(232, 232, 232, 1), dark: rgba(255, 255, 255, 0.09))
    static let chrome = color(light: rgba(252, 252, 252, 0.92), dark: rgba(13, 13, 13, 0.88))
    static let ink = color(light: rgba(18, 18, 18, 1), dark: rgba(242, 242, 242, 1))
    static let muted = color(light: rgba(92, 92, 92, 1), dark: rgba(164, 164, 164, 1))
    static let faint = color(light: rgba(130, 130, 130, 1), dark: rgba(118, 118, 118, 1))
    static let line = color(light: rgba(226, 226, 226, 1), dark: rgba(255, 255, 255, 0.11))
    static let brand = color(light: rgba(18, 18, 18, 1), dark: rgba(9, 9, 9, 1))
    static let primary = color(light: rgba(23, 23, 23, 1), dark: rgba(240, 240, 240, 1))
    static let onPrimary = color(light: rgba(255, 255, 255, 1), dark: rgba(13, 13, 13, 1))
    static let danger = color(light: rgba(193, 46, 40, 1), dark: rgba(247, 113, 105, 1))
    static let onDanger = color(light: rgba(255, 255, 255, 1), dark: rgba(24, 8, 7, 1))
    static let warning = color(light: rgba(170, 92, 15, 1), dark: rgba(233, 166, 60, 1))
    static let success = color(light: rgba(16, 122, 86, 1), dark: rgba(66, 199, 132, 1))
    static let segmentTrack = color(light: rgba(235, 235, 235, 1), dark: rgba(28, 28, 28, 1))
    static let segmentSelected = color(light: rgba(255, 255, 255, 1), dark: rgba(58, 58, 58, 1))
    static let cardShadow = color(light: rgba(18, 18, 18, 0.06), dark: rgba(0, 0, 0, 0.60))
  #elseif canImport(AppKit)
    static let canvas = Color(red: 0.961, green: 0.961, blue: 0.961)
    static let surface = Color.white
    static let control = Color(red: 0.937, green: 0.937, blue: 0.937)
    static let ink = Color(red: 0.071, green: 0.071, blue: 0.071)
    static let muted = Color(red: 0.361, green: 0.361, blue: 0.361)
    static let line = Color(red: 0.886, green: 0.886, blue: 0.886)
    static let brand = Color(red: 0.071, green: 0.071, blue: 0.071)
    static let surfaceRaised = Color.white
    static let chrome = Color.white.opacity(0.86)
    static let onPrimary = Color.white
    static let onDanger = Color.white
    static let primary = Color(red: 0.090, green: 0.090, blue: 0.090)
    static let danger = Color(red: 0.757, green: 0.180, blue: 0.157)
    static let warning = Color(red: 0.667, green: 0.361, blue: 0.059)
    static let success = Color(red: 0.063, green: 0.478, blue: 0.337)
    static let tile = Color(red: 0.969, green: 0.969, blue: 0.969)
    static let tileLine = Color(red: 0.910, green: 0.910, blue: 0.910)
    static let faint = Color(red: 0.510, green: 0.510, blue: 0.510)
    static let segmentTrack = Color(red: 0.922, green: 0.922, blue: 0.922)
    static let segmentSelected = Color.white
    static let cardShadow = Color(red: 0.071, green: 0.071, blue: 0.071).opacity(0.06)
  #else
    private static func color(_ red: CGFloat, _ green: CGFloat, _ blue: CGFloat) -> Color {
      Color(red: red / 255, green: green / 255, blue: blue / 255)
    }

    static let canvas = color(245, 245, 245)
    static let surface = color(255, 255, 255)
    static let control = color(239, 239, 239)
    static let ink = color(18, 18, 18)
    static let muted = color(92, 92, 92)
    static let line = color(226, 226, 226)
    static let brand = color(18, 18, 18)
    static let surfaceRaised = color(255, 255, 255)
    static let chrome = color(255, 255, 255, 0.82)
    static let onPrimary = color(255, 255, 255)
    static let onDanger = color(255, 255, 255)
    static let primary = color(23, 23, 23)
    static let danger = color(190, 65, 57)
    static let warning = color(170, 111, 23)
    static let success = color(50, 150, 101)
    static let tile = color(247, 247, 247)
    static let tileLine = color(232, 232, 232)
    static let faint = color(130, 130, 130)
    static let segmentTrack = color(235, 235, 235)
    static let segmentSelected = color(255, 255, 255)
    static let cardShadow = color(18, 18, 18)
  #endif
}

public enum AITheme {
  public static let canvas = AIPalette.canvas
  public static let surface = AIPalette.surface
  public static let surfaceRaised = AIPalette.surfaceRaised
  public static let control = AIPalette.control
  public static let tile = AIPalette.tile
  public static let tileLine = AIPalette.tileLine
  public static let chrome = AIPalette.chrome
  public static let ink = AIPalette.ink
  public static let muted = AIPalette.muted
  public static let faint = AIPalette.faint
  public static let line = AIPalette.line
  public static let brand = AIPalette.brand
  public static let primary = AIPalette.primary
  public static let onPrimary = AIPalette.onPrimary
  public static let danger = AIPalette.danger
  public static let onDanger = AIPalette.onDanger
  public static let warning = AIPalette.warning
  public static let success = AIPalette.success
  public static let segmentTrack = AIPalette.segmentTrack
  public static let segmentSelected = AIPalette.segmentSelected
  public static let cardShadow = AIPalette.cardShadow

  public static let buttonHeight: CGFloat = 48
  // 停用态主按钮保留一层主色淡底，避免和次级按钮长得一模一样，层级读不出来。
  public static let disabledFillOpacity: Double = 0.14
  public static let disabledStrokeOpacity: Double = 0.22
  public static let compactButtonHeight: CGFloat = 44
  public static let largeButtonHeight: CGFloat = 56
  public static let toolbarButtonHeight: CGFloat = 44
  // 导航栏只给约 38pt 高度，44pt 的方块会被上下裁切，所以工具栏图标按钮单独取 34。
  public static let iconButtonSize: CGFloat = 34
  public static let iconButtonRadius: CGFloat = 11
  public static let buttonRadius: CGFloat = 16
  public static let cardRadius: CGFloat = 22
  public static let inputRadius: CGFloat = 16
  public static let inputHeight: CGFloat = 52
  public static let segmentedControlHeight: CGFloat = 44
  public static let tileRadius: CGFloat = 14
  public static let chipHeight: CGFloat = 34
  public static let compactControlHeight: CGFloat = 44
  public static let compactButtonMinWidth: CGFloat = 72
  public static let regularButtonMinWidth: CGFloat = 88
  public static let toolbarButtonMinWidth: CGFloat = 96
  public static let toolbarButtonWidth: CGFloat = 104
  public static let footerSecondaryButtonWidth: CGFloat = 104
  public static let listActionButtonWidth: CGFloat = 84
}