TextView.swift

import SwiftUI

public protocol TextView {
    var font: UIFont? { get set }
    func font(_ font: Font?) -> Self

    var textAlignment: NSTextAlignment { get set }
    func multilineTextAlignment(_ alignment: TextAlignment) -> Self

    var lineBreakMode: NSLineBreakMode { get set }
    func truncationMode(_ mode: Text.TruncationMode) -> Self

    var textColor: UIColor { get set }
    func foregroundColor(_ color: Color?) -> Self

    var backgroundColor: UIColor { get set }
    func backgroundColor(_ color: Color?) -> Self
}

public extension TextView {
    func font(_ font: Font?) -> Self {
        var view = self

        if let font = font {
            view.font = UIFont.with(font: font)
        } else {
            view.font = nil
        }

        return view
    }

    func multilineTextAlignment(_ alignment: TextAlignment) -> Self {
        var view = self

        switch alignment {
        case .center:
            view.textAlignment = .center
        case .leading:
            view.textAlignment = .left
        case .trailing:
            view.textAlignment = .right
        }

        return view
    }

    func truncationMode(_ mode: Text.TruncationMode) -> Self {
        var view = self

        switch mode {
        case .head:
            view.lineBreakMode = .byTruncatingHead
        case .middle:
            view.lineBreakMode = .byTruncatingMiddle
        case .tail:
            view.lineBreakMode = .byTruncatingTail
        default:
            view.lineBreakMode = .byClipping
        }

        return view
    }

    func foregroundColor(_ color: Color?) -> Self {
        var view = self

        if let color = color {
            view.textColor = UIColor(color)
        } else {
            view.textColor = .label
        }

        return view
    }

    func backgroundColor(_ color: Color?) -> Self {
        var view = self

        if let color = color {
            view.backgroundColor = UIColor(color)
        } else {
            view.backgroundColor = .clear
        }

        return view
    }
}