//
//  ModelColorConfiguration.swift
//  VDS
//
//  Created by Matt Bruce on 8/4/22.
//

import Foundation
import UIKit

public typealias ObjectColorable = Colorable & Initable & ObjectWithable

/// Meant to be used in a Object that implements the following interfaces for 2 possible color combinations
/// - Surfaceable (var surface: Surface)
///
///     let model = TestModel()
///     model.surface = .light
///
///     let config = SurfaceColorConfiguration()
///     config.lightColor = .black
///     config.darkColor = .white
///
///     let textColor = config.getColor(model) //returns .black

open class SurfaceColorConfiguration: ObjectColorable {
    public typealias ObjectType = Surfaceable
    public var lightColor: UIColor = .clear
    public var darkColor: UIColor = .clear

    required public init(){}
    
    public init(_ lightColor: UIColor, _ darkColor: UIColor) {
        self.lightColor = lightColor
        self.darkColor = darkColor
    }

    public func getColor(_ surface: Surface) -> UIColor {
        return surface == .light ? lightColor : darkColor
    }
    
    public func getColor(_ object: any ObjectType) -> UIColor {
        return getColor(object.surface)
    }
}


/// Struct to Hold onto KeyType and SurfaceConfiguration
public struct KeyColorConfiguration<KeyType: Equatable> {
    var key: KeyType
    var surfaceConfig: SurfaceColorConfiguration
}

// Protocol to Hold onto the relationship of KeyType and SurfaceConfiguration
public protocol KeyColorConfigurable: ObjectColorable {
    associatedtype KeyType: Equatable
    var keyColors: [KeyColorConfiguration<KeyType>] { get set }
}

extension KeyColorConfigurable {
    public func setSurfaceColors(_ lightColor: UIColor, _ darkColor: UIColor, forKey key: KeyType) {
        keyColors.append(.init(key: key, surfaceConfig: .init(lightColor, darkColor)))
    }
    
    public func reset() {
        keyColors.removeAll()
    }
}


public class ControlColorConfiguration: KeyColorConfigurable {
    public typealias KeyType = UIControl.State
    public typealias ObjectType = Surfaceable & UIControl
    public var keyColors: [KeyColorConfiguration<KeyType>] = []
   
    public required init() { }

    public func setSurfaceColors(_ lightColor: UIColor, _ darkColor: UIColor, forState state: KeyType) {
        setSurfaceColors(lightColor, darkColor, forKey: state)
    }
    
    public func getColor(_ object: any ObjectType) -> UIColor {
        let state = object.state
        let surface = object.surface
        
        // find the exact match
        if let keyColor = keyColors.first(where: {$0.key == state }) {
            return keyColor.surfaceConfig.getColor(surface)

        } else if state.contains(.disabled), let keyColor = keyColors.first(where: {$0.key == .disabled }) {
            return keyColor.surfaceConfig.getColor(surface)

        } else if state.contains(.highlighted), let keyColor = keyColors.first(where: {$0.key == .highlighted }) {
            return keyColor.surfaceConfig.getColor(surface)

        } else {
            return .clear
        }
    }
}

public class ViewColorConfiguration: KeyColorConfigurable {
    public typealias KeyType = Bool
    public typealias ObjectType = Surfaceable & Disabling
    public var keyColors: [KeyColorConfiguration<KeyType>] = []
    
    public required init() { }
    
    public func setSurfaceColors(_ lightColor: UIColor, _ darkColor: UIColor, forDisabled disabled: KeyType) {
        setSurfaceColors(lightColor, darkColor, forKey: disabled)
    }
    
    public func getColor(_ object: ObjectType) -> UIColor {
        if let keyColor = keyColors.first(where: {$0.key == object.disabled }) {
            return keyColor.surfaceConfig.getColor(object)
        } else {
            return .clear //default
        }
    }
}

/// Generic Class that allows reflection for a object's specific property (equatable) to be defined as the lookup for a SurfaceConfiguration
public class KeyedColorConfiguration<KeyType: Equatable, ObjectType: Surfaceable> : KeyColorConfigurable {
    //Type of Class that at least implements Surfaceable
    public typealias ObjectType = ObjectType
    
    /// property that will be used for reflection, the type of this property must implement Equatable
    public var keyName: String
        
    /// Array of structs where the KeyValue is registered against a SurfaceColorConfiguration
    public var keyColors: [KeyColorConfiguration<KeyType>] = []
    
    public required init() {
        self.keyName = ""
    }
    
    //this must be used
    public convenience init(keyName: String) {
        self.init()
        self.keyName = keyName
    }
    
    public func getKeyValue(_ object: ObjectType) -> KeyType? {
        guard !keyName.isEmpty else { fatalError("keyName must not be empty, make sure you initialize this class using init(keyName: String) method") }
        
        let mirror = Mirror(reflecting: object)
        guard let result = mirror.children.first(where: {$0.label == keyName })?.value as? KeyType, !mirror.children.isEmpty else { return nil }
        return result
    }

    public func getColor(_ object: ObjectType) -> UIColor {
        if let key = getKeyValue(object), let keyColor = keyColors.first(where: {$0.key == key }) {
            return keyColor.surfaceConfig.getColor(object)
        } else {
            return .clear //default
        }
    }
}