import SwiftUI

public struct VoltraText: VoltraView {
  public typealias Parameters = TextParameters

  public let element: VoltraElement

  public init(_ element: VoltraElement) {
    self.element = element
  }

  public var body: some View {
    let textContent: String = {
      if let children = element.children, case let .text(text) = children {
        return text
      }
      return ""
    }()
    let anyStyle = (element.style ?? [:]).mapValues { $0.toAny() }
    let style = StyleConverter.convert(anyStyle)
    let textStyle = style.3

    var font: Font {
      var baseFont = Font.system(size: textStyle.fontSize, weight: textStyle.fontWeight)

      if textStyle.fontVariant.contains(.smallCaps) {
        baseFont = baseFont.smallCaps()
      }

      if textStyle.fontVariant.contains(.tabularNums) {
        baseFont = baseFont.monospacedDigit()
      }

      return baseFont
    }

    Text(.init(textContent))
      .kerning(textStyle.letterSpacing)
      .underline(textStyle.decoration == .underline || textStyle.decoration == .underlineLineThrough)
      .strikethrough(textStyle.decoration == .lineThrough || textStyle.decoration == .underlineLineThrough)
      // These technically work on View, but good to keep close
      .font(font)
      .foregroundColor(textStyle.color)
      .multilineTextAlignment(textStyle.alignment)
      .lineSpacing(textStyle.lineSpacing)
      .voltraIfLet(params.numberOfLines) { view, numberOfLines in
        view.lineLimit(Int(numberOfLines))
      }
      .applyStyle(element.style)
  }
}