Appearance.swift

import Cocoa

class Appearance {
    // size
    static var windowPadding = CGFloat(18)
    static var interCellPadding = CGFloat(5)
    static var intraCellPadding = CGFloat(1)
    static var edgeInsetsSize = CGFloat(5)
    static var cellCornerRadius = CGFloat(10)
    static var windowCornerRadius = CGFloat(23)
    static var hideThumbnails = Bool(false)
    static var rowsCount = CGFloat(0)
    static var windowMinWidthInRow = CGFloat(0)
    static var windowMaxWidthInRow = CGFloat(0)
    static var iconSize = CGFloat(0)
    static var fontHeight = CGFloat(0)
    static var maxWidthOnScreen = CGFloat(0)
    static var maxHeightOnScreen = CGFloat(0)
    
    // theme
    static var material = NSVisualEffectView.Material.dark
    static var fontColor = NSColor.white
    static var indicatedIconShadowColor: NSColor? = .darkGray
    static var titleShadowColor: NSColor? = .darkGray
    static var imageShadowColor: NSColor? = .gray // for icon, thumbnail and windowless images
    static var highlightMaterial = NSVisualEffectView.Material.selection
    static var highlightFocusedAlphaValue = 1.0
    static var highlightHoveredAlphaValue = 0.8
    static var highlightFocusedBackgroundColor = NSColor.black.withAlphaComponent(0.5)
    static var highlightHoveredBackgroundColor = NSColor.black.withAlphaComponent(0.3)
    static var highlightFocusedBorderColor = NSColor.clear
    static var highlightHoveredBorderColor = NSColor.clear
    static var highlightBorderShadowColor = NSColor.clear
    static var highlightBorderWidth = CGFloat(0)
    static var enablePanelShadow = false

    // derived
    static var font: NSFont { NSFont.systemFont(ofSize: fontHeight) }

    private static var currentStyle: AppearanceStylePreference { Preferences.appearanceStyle }
    private static var currentSize: AppearanceSizePreference { Preferences.appearanceSize }
    private static var currentTheme: AppearanceThemePreference {
        if Preferences.appearanceTheme == .system {
            return NSAppearance.current.getThemeName()
        } else {
            return Preferences.appearanceTheme
        }
    }
    private static var currentVisibility: AppearanceVisibilityPreference { Preferences.appearanceVisibility }

    static func update() {
        updateSize()
        updateTheme()
    }

    private static func updateSize() {
        let isHorizontalScreen = NSScreen.preferred().isHorizontal()
        if currentStyle == .appIcons {
            appIconsSize()
        } else if currentStyle == .titles {
            titlesSize(isHorizontalScreen)
        } else {
            thumbnailsSize(isHorizontalScreen)
        }
    }

    private static func updateTheme() {
        if currentTheme == .dark {
            darkTheme()
        } else {
            lightTheme()
        }
    }

    private static func thumbnailsSize(_ isHorizontalScreen: Bool) {
        hideThumbnails = false
        windowPadding = 18
        cellCornerRadius = 10
        windowCornerRadius = 23
        intraCellPadding = 5
        interCellPadding = 1
        edgeInsetsSize = 12
        maxWidthOnScreen = 0.9
        maxHeightOnScreen = 0.8
        windowMinWidthInRow = 0.1
        windowMaxWidthInRow = 0.9
        switch currentSize {
        case .small:
            rowsCount = isHorizontalScreen ? 5 : 8
            windowMinWidthInRow = 0.08
            windowMaxWidthInRow = 0.9
            iconSize = 30
            fontHeight = 14
        case .medium:
            rowsCount = isHorizontalScreen ? 4 : 7
            iconSize = 30
            fontHeight = 15
        case .large:
            rowsCount = isHorizontalScreen ? 3 : 6
            iconSize = 40
            fontHeight = 18
        }
        if currentVisibility == .highest {
            edgeInsetsSize = 10
            cellCornerRadius = 12
        }
    }

    private static func appIconsSize() {
        hideThumbnails = true
        windowPadding = 25
        cellCornerRadius = 10
        windowCornerRadius = 23
        intraCellPadding = 5
        interCellPadding = 1
        edgeInsetsSize = 5
        maxWidthOnScreen = 0.95
        maxHeightOnScreen = 0.9
        windowMinWidthInRow = 0.04
        windowMaxWidthInRow = 0.3
        rowsCount = 1
        switch currentSize {
        case .small:
            iconSize = 88
            fontHeight = 15
        case .medium:
            iconSize = 128
            fontHeight = 15
        case .large:
            windowPadding = 28
            iconSize = 168
            fontHeight = 20
        }
    }

    private static func titlesSize(_ isHorizontalScreen: Bool) {
        hideThumbnails = true
        windowPadding = 18
        cellCornerRadius = 10
        windowCornerRadius = 23
        intraCellPadding = 5
        interCellPadding = 1
        edgeInsetsSize = 7
        maxWidthOnScreen = isHorizontalScreen ? 0.6 : 0.85
        maxHeightOnScreen = 0.8
        windowMinWidthInRow = 0.6
        windowMaxWidthInRow = 0.9
        rowsCount = 1
        switch currentSize {
        case .small:
            iconSize = 25
            fontHeight = 13
        case .medium:
            iconSize = 30
            fontHeight = 15
        case .large:
            iconSize = 40
            fontHeight = 18
        }
    }

    private static func lightTheme() {
        fontColor = .black.withAlphaComponent(0.8)
        titleShadowColor = nil
        indicatedIconShadowColor = nil
        imageShadowColor = .lightGray.withAlphaComponent(0.4)
        highlightMaterial = .mediumLight
        switch currentVisibility {
        case .normal:
            material = .light
            highlightFocusedBackgroundColor = .lightGray.withAlphaComponent(0.7)
            highlightHoveredBackgroundColor = .lightGray.withAlphaComponent(0.5)
            enablePanelShadow = false
            highlightFocusedAlphaValue = 1.0
            highlightHoveredAlphaValue = 0.8
            highlightFocusedBorderColor = NSColor.clear
            highlightHoveredBorderColor = NSColor.clear
            highlightBorderShadowColor = NSColor.clear
            highlightBorderWidth = 0
        case .high:
            material = .mediumLight
            highlightFocusedBackgroundColor = .lightGray.withAlphaComponent(0.7)
            highlightHoveredBackgroundColor = .lightGray.withAlphaComponent(0.5)
            enablePanelShadow = true
            highlightFocusedAlphaValue = 1.0
            highlightHoveredAlphaValue = 0.8
            highlightFocusedBorderColor = .lightGray.withAlphaComponent(0.9)
            highlightHoveredBorderColor = .lightGray.withAlphaComponent(0.8)
            highlightBorderShadowColor = .black.withAlphaComponent(0.5)
            highlightBorderWidth = 1

        case .highest:
            material = .mediumLight
            highlightFocusedBackgroundColor = .lightGray.withAlphaComponent(0.4)
            highlightHoveredBackgroundColor = .lightGray.withAlphaComponent(0.3)
            enablePanelShadow = true
            highlightFocusedAlphaValue = 0.4
            highlightHoveredAlphaValue = 0.2
            highlightFocusedBorderColor = NSColor.systemAccentColor
            highlightHoveredBorderColor = NSColor.systemAccentColor.withAlphaComponent(0.8)
            highlightBorderShadowColor = .black.withAlphaComponent(0.5)
            highlightBorderWidth = currentStyle == .titles ? 2 : 4
        }
    }

    private static func darkTheme() {
        fontColor = .white.withAlphaComponent(0.9)
        indicatedIconShadowColor = .darkGray
        titleShadowColor = .darkGray
        highlightMaterial = .ultraDark
        switch currentVisibility {
        case .normal:
            material = .dark
            imageShadowColor = .gray.withAlphaComponent(0.8)
            highlightFocusedBackgroundColor = .black.withAlphaComponent(0.6)
            highlightHoveredBackgroundColor = .black.withAlphaComponent(0.5)
            enablePanelShadow = false
            highlightFocusedAlphaValue = 1.0
            highlightHoveredAlphaValue = 0.8
            highlightFocusedBorderColor = NSColor.clear
            highlightHoveredBorderColor = NSColor.clear
            highlightBorderShadowColor = NSColor.clear
            highlightBorderWidth = 0
        case .high:
            material = .ultraDark
            imageShadowColor = .gray.withAlphaComponent(0.4)
            highlightFocusedBackgroundColor = .gray.withAlphaComponent(0.6)
            highlightHoveredBackgroundColor = .gray.withAlphaComponent(0.4)
            enablePanelShadow = true
            highlightFocusedAlphaValue = 1.0
            highlightHoveredAlphaValue = 0.8
            highlightFocusedBorderColor = .gray.withAlphaComponent(0.8)
            highlightHoveredBorderColor = .gray.withAlphaComponent(0.7)
            highlightBorderShadowColor = .white.withAlphaComponent(0.5)
            highlightBorderWidth = 1
        case .highest:
            material = .ultraDark
            imageShadowColor = .gray.withAlphaComponent(0.4)
            highlightFocusedBackgroundColor = .black.withAlphaComponent(0.4)
            highlightHoveredBackgroundColor = .black.withAlphaComponent(0.2)
            enablePanelShadow = true
            highlightFocusedAlphaValue = 0.4
            highlightHoveredAlphaValue = 0.2
            highlightFocusedBorderColor = NSColor.systemAccentColor
            highlightHoveredBorderColor = NSColor.systemAccentColor.withAlphaComponent(0.8)
            highlightBorderShadowColor = .white.withAlphaComponent(0.5)
            highlightBorderWidth = currentStyle == .titles ? 2 : 4
        }
    }
}