import SwiftUI

struct MainHomeBusinessInfoSection: View {
    var body: some View {
        BusinessInfoExpandableTextView(
            text: I18n.Settings.companyInfo,
            lineLimit: 3,
            moreTitle: I18n.HomeRecommendation.more,
            collapseTitle: I18n.HomeRecommendation.collapse,
            font: .body5,
            foregroundColor: Color.gray500
        )
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(.horizontal, SodaSpacing.s14)
    }
}

private struct BusinessInfoExpandableTextView: View {
    let text: String
    let lineLimit: Int
    let moreTitle: String
    let collapseTitle: String
    let font: SodaTypography
    let foregroundColor: Color

    @State private var isExpanded = false
    @State private var fullTextHeight: CGFloat = 0
    @State private var limitedTextHeight: CGFloat = 0

    var body: some View {
        VStack(alignment: .leading, spacing: SodaSpacing.s8) {
            Text(text)
                .appFont(font)
                .foregroundColor(foregroundColor)
                .lineLimit(isExpanded ? nil : lineLimit)
                .background(measuringText(lineLimit: nil, height: $fullTextHeight))
                .background(measuringText(lineLimit: lineLimit, height: $limitedTextHeight))

            if fullTextHeight > limitedTextHeight + 1 {
                Button {
                    isExpanded.toggle()
                } label: {
                    Text(isExpanded ? collapseTitle : moreTitle)
                        .appFont(.body5)
                        .foregroundColor(.white)
                }
                .buttonStyle(.plain)
            }
        }
    }

    private func measuringText(lineLimit: Int?, height: Binding<CGFloat>) -> some View {
        Text(text)
            .appFont(font)
            .lineLimit(lineLimit)
            .fixedSize(horizontal: false, vertical: true)
            .hidden()
            .background(
                GeometryReader { proxy in
                    Color.clear
                        .onAppear { height.wrappedValue = proxy.size.height }
                        .onChange(of: proxy.size.height) { newHeight in height.wrappedValue = newHeight }
                        .onChange(of: text) { _ in height.wrappedValue = proxy.size.height }
                }
            )
    }
}

struct MainHomeBusinessInfoSection_Previews: PreviewProvider {
    static var previews: some View {
        MainHomeBusinessInfoSection()
            .padding(.vertical, SodaSpacing.s20)
            .background(Color.black)
            .previewLayout(.sizeThatFits)
    }
}