//
//  PriceLockup.swift
//  VDS
//
//  Created by Kanamarlapudi, Vasavi on 06/08/24.
//

import Foundation
import UIKit
import VDSCoreTokens

@objcMembers
@objc(VDSPriceLockup)
open class PriceLockup: View {
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
    }
    
    public override init(frame: CGRect) {
        super.init(frame: .zero)
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    //--------------------------------------------------
    // MARK: - Enums
    //--------------------------------------------------
    /// Enum used to describe the kind of PriceLockup.
    public enum Kind: String, CaseIterable {
        case primary, secondary, savings
    }
    
    /// Enum used to describe the term of PriceLockup.
    public enum Term: String, CaseIterable {
        case month, year, biennial, none
        
        /// The default term is 'month'.
        public static var defaultValue : Self { .month }
        
        /// Text for this term of PriceLockup.
        public var text: String {
            switch self {
            case .month:
                return "mo"
            case .year:
                return "yr"
            case .biennial:
                return "biennial"
            case .none:
                return ""
            }
        }
    }
    
    /// Enum type describing size of PriceLockup.
    public enum Size: String, CaseIterable {
        case xxxsmall
        case xxsmall
        case xsmall
        case small
        case medium
        case large
        case xlarge
        case xxlarge
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    
    /// If true, the component will render as bold.
    open var bold: Bool = false { didSet { setNeedsUpdate() } }
    
    /// Currency - If hideCurrency true, the component will render without currency.
    open var hideCurrency: Bool = false { didSet { setNeedsUpdate() } }

    /// Leading text for the component.
    open var leadingText: String? { didSet { setNeedsUpdate() } }

    /// Value rendered for the component.
    open var price: CGFloat? { didSet { setNeedsUpdate() } }
    
    /// Color to the component. The default kind is primary.
    open var kind: Kind = .primary { didSet { setNeedsUpdate() } }

    /// Size of the component. It varies by size and viewport(mobile/Tablet).
    /// The default size is medium with viewport mobile.
    open var size: Size = .medium { didSet { setNeedsUpdate() } }

    /// If true, the component with a strikethrough. It applies only when uniformSize is true.
    /// Does not apply a strikethrough format to leading and trailing text.
    open var strikethrough: Bool = false { didSet { setNeedsUpdate() } }

    /// Term text for the component. The default term is 'month'.
    /// Superscript placement can vary when term and delimeter are "none".
    open var term: Term = Term.defaultValue { didSet { setNeedsUpdate() } }
    
    /// Trailing text for the component.
    open var trailingText: String? { didSet { setNeedsUpdate() } }
    
    /// Superscript text for the component.
    open var superscript: String? { didSet { setNeedsUpdate() } }
    
    /// If true, currency and value have the same font text style as delimeter, term label and superscript.
    /// This will render the pricing and term sections as a uniform size.
    open var uniformSize: Bool = false { didSet { setNeedsUpdate() } }

    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    internal var containerView = View().with {
        $0.clipsToBounds = true
    }
    
    internal var label = Label().with {
        $0.isAccessibilityElement = false
        $0.lineBreakMode = .byWordWrapping
    }
    
    //--------------------------------------------------
    // MARK: - Configuration Properties
    //--------------------------------------------------
    internal var containerSize: CGSize { CGSize(width: 45, height: 44) }

    private var kindColorConfiguration: AnyColorable {
        switch kind {
        case .primary:
            return ControlColorConfiguration().with {
                $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forState: .normal)}.eraseToAnyColorable()
        case .secondary:
            return ControlColorConfiguration().with {
                $0.setSurfaceColors(VDSColor.elementsSecondaryOnlight, VDSColor.elementsSecondaryOndark, forState: .normal)}.eraseToAnyColorable()
        case .savings:
            return ControlColorConfiguration().with {
                $0.setSurfaceColors(VDSColor.paletteGreen26, VDSColor.paletteGreen36, forState: .normal)}.eraseToAnyColorable()
        }
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    /// Called once when a view is initialized and is used to Setup additional UI or other constants and configurations.
    open override func setup() {
        super.setup()
        addSubview(containerView)
        containerView
            .pinTop()
            .pinBottom()
            .pinLeadingGreaterThanOrEqualTo()
            .pinTrailingLessThanOrEqualTo()
            .height(containerSize.height)
        
        containerView.centerXAnchor.constraint(equalTo: centerXAnchor).activate()
       
        // Price lockup
        containerView.addSubview(label)
        label.pinToSuperView()
        label.centerXAnchor.constraint(equalTo: centerXAnchor).activate()
    }
    
    /// Used to make changes to the View based off a change events or from local properties.
    open override func updateView() {
        super.updateView()
        label.text = fetchText()
    }
    
    /// Resets to default settings.
    open override func reset() {
        super.reset()
        shouldUpdateView = false
        label.reset()
        shouldUpdateView = true
        setNeedsUpdate()
    }
    
    open override var accessibilityElements: [Any]? {
        get {
            return nil
        }
        set {}
    }
    
    //--------------------------------------------------
    // MARK: - Private Methods
    //--------------------------------------------------
    open func fetchText() -> String {
        var text : String = ""
        let currency: String = hideCurrency ? "" : "$"
        if let leadingStr = leadingText {
            text = text + leadingStr + " "
        }
        if let value = price {
            text = text + currency + "\(value)"
        }
        if term != .none {
            text = text + "/" + term.text
        }
        if let trailingStr = trailingText {
            text = text + " " + trailingStr
        }
        text = text + (superscript ?? "")
        return text
        
    }
}