//
//  TitleLockupStandardStyleConfiguration.swift
//  VDS
//
//  Created by Matt Bruce on 6/29/23.
//

import Foundation
import UIKit
import VDSTokens

extension TitleLockup {
    
    /// Configuration that will set the spacing between labels based off their textStyles.
    public struct StandardStyleConfigurationProvider {
        /// Array of standard style configurations.
        public var styleConfigurations: [StandardStyleConfiguration]
        
        public init(styleConfigurations: [StandardStyleConfiguration]) {
            self.styleConfigurations = styleConfigurations
        }
        
        
        /// Will find a standard style configuration for the title standard style against the running device type.
        /// - titleStandardStyle: title standard style
        /// - Returns: Standard Style configuration that matches
        public func configuration(for titleStandardStyle: TitleStandardStyle) -> StandardStyleConfiguration? {
            let deviceType: StandardStyleConfiguration.DeviceType = UIDevice.isIPad ? .iPad : .iPhone
            guard let config: StandardStyleConfiguration = styleConfigurations.first(where: { return titleStandardStyle.isWithin($0.titleStandardStyles) && ($0.deviceType == deviceType || $0.deviceType == .all )}) else { return nil }
            return config
        }
        
        /// Determines if there is a configuration for this title style as well as a matching spacing configuration against the other standard style.
        /// - Parameters:
        ///   - otherStandardStyle: other standard style
        ///   - titleStandardStyle: title standard style
        /// - Returns: Whether or not there is a
        public func isValid(otherStandardStyle: OtherStandardStyle, for titleStandardStyle: TitleStandardStyle) -> Bool {
            guard let config = configuration(for: titleStandardStyle) else { return false }
            return otherStandardStyle.isWithin(config.spacingConfigurations.flatMap {$0.otherStandardStyles})
        }
        
        /// Will find the spacing for a specific title standard style against a other standard style. If one isn't found a default spacing is returned.
        /// - Parameters:
        ///   - titleStandardStyle: title standard style
        ///   - otherStandardStyle: other standard style
        /// - Returns: Tuple of the standard style as well as the top and bottom spacing.
        public func spacing(for titleStandardStyle: TitleStandardStyle, otherStandardStyle: OtherStandardStyle) -> (otherStandardStyle: OtherStandardStyle, topSpacing: CGFloat, bottomSpacing: CGFloat)? {
            guard let config = configuration(for: titleStandardStyle) else { return nil }
            return config.styleSpacing(for: otherStandardStyle)
        }
    }
    
    /// Configuration that will set the spacing between labels based off the device type and their textStyles.
    public struct StandardStyleConfiguration {
        /// Enum for the devices for this configuration.
        public enum DeviceType {
            case iPhone, iPad, all
        }
        /// Device type for this configuration.
        public var deviceType: DeviceType
        
        /// Array of title standard styles, first style is always the default.
        public var titleStandardStyles:[TitleStandardStyle]
        
        /// Array of spacing configurations for spacing.
        public var spacingConfigurations: [SpacingConfiguration]
        
        public init(deviceType: DeviceType, titleStandardStyles: [TitleStandardStyle], spacingConfigurations: [SpacingConfiguration]) {
            self.deviceType = deviceType
            self.titleStandardStyles = titleStandardStyles
            self.spacingConfigurations = spacingConfigurations
        }

        /// Flattend array of all spacingConfigurations array of other standard styles.
        public var allOtherStandardStyles: [OtherStandardStyle] {
            spacingConfigurations.flatMap {$0.otherStandardStyles}
        }
        
        
        /// Takes a other standard style and will either find the spacing configuration that matches or returns a default top and bottom spacing.
        /// - Parameter otherStandardStyle: other standard style you need to find the configuration for top and bottom spacing
        /// - Returns: Tuple of the other standard style passed in and the configuration for top and bottom spacing.
        public func styleSpacing(for otherStandardStyle: OtherStandardStyle) -> (otherStandardStyle: OtherStandardStyle, topSpacing: CGFloat, bottomSpacing: CGFloat) {
            //set default return other style what you pass in
            var realOtherStyle = otherStandardStyle
            
            //flatten all of the other styles registered for the title styles
            let allOtherStyles = spacingConfigurations.flatMap {$0.otherStandardStyles}
            
            //get the default other style incase what is passed isn't within the registered collection
            if let first = allOtherStyles.first, !realOtherStyle.isWithin(allOtherStyles) {
                realOtherStyle = first
            }
            //get the config against the other style or return defaults
            guard let styleSpacing = spacingConfigurations.first(where: {realOtherStyle.isWithin($0.otherStandardStyles)})  else {
                return (realOtherStyle, VDSLayout.space2X, VDSLayout.space2X)
            }
            return (realOtherStyle, styleSpacing.topSpacing, styleSpacing.bottomSpacing)
        }
    }
    
    /// Configuration to define spacing for an array of standard styles.
    public struct SpacingConfiguration {
        /// Array of other standard styles
        public var otherStandardStyles: [OtherStandardStyle]
        
        /// Configuration of topSpacing for the other standard styles
        public var topSpacing: CGFloat
        
        /// Configuration of bottomSpacing for the other standard styles
        public var bottomSpacing: CGFloat
        
        public init(otherStandardStyles: [OtherStandardStyle], topSpacing: CGFloat, bottomSpacing: CGFloat) {
            self.otherStandardStyles = otherStandardStyles
            self.topSpacing = topSpacing
            self.bottomSpacing = bottomSpacing
        }
    }
}