import SwiftUI

struct ApprovalCardModifier: ViewModifier {
    var highlighted = false

    func body(content: Content) -> some View {
        content
            .padding(14)
            .background(
                RoundedRectangle(cornerRadius: IdP.cardRadius, style: .continuous)
                    .fill(Color.idpCard)
            )
            .overlay(
                RoundedRectangle(cornerRadius: IdP.cardRadius, style: .continuous)
                    .stroke(highlighted ? IdP.tint : Color.idpBorder, lineWidth: 1)
            )
            .background(
                highlighted
                    ? RoundedRectangle(cornerRadius: IdP.cardRadius + 3, style: .continuous)
                        .fill(IdP.tint.opacity(0.10))
                        .padding(-3)
                    : nil
            )
    }
}

extension View {
    func approvalCard(highlighted: Bool = false) -> some View {
        modifier(ApprovalCardModifier(highlighted: highlighted))
    }

    func deviceRowStyle() -> some View {
        modifier(DeviceRowStyle())
    }
}

struct RequestHeroCard: View {
    let request: ApprovalRequest
    let handle: String

    var body: some View {
        VStack(spacing: 12) {
            MonogramAvatar(
                title: request.source,
                size: 52,
                tint: BrandTint.color(for: request.source),
                filled: true
            )

            VStack(spacing: 4) {
                Text("\(request.source) wants to sign in")
                    .font(.title3.weight(.bold))
                    .multilineTextAlignment(.center)
                    .fixedSize(horizontal: false, vertical: true)

                HStack(spacing: 4) {
                    Text("requesting")
                    Text(handle)
                        .foregroundStyle(IdP.tint)
                        .fontWeight(.semibold)
                    Text("·")
                    Text(request.createdAt, style: .relative)
                }
                .font(.footnote)
                .foregroundStyle(Color.idpMutedForeground)
            }
        }
        .frame(maxWidth: .infinity)
        .padding(.vertical, 6)
        .approvalCard(highlighted: false)
    }
}

struct MonogramAvatar: View {
    let title: String
    var size: CGFloat = 40
    var tint: Color = IdP.tint
    /// Shadcn-style filled tile (brand color bg, white text).
    /// When false, renders the legacy tinted-pastel avatar.
    var filled: Bool = true

    private var monogram: String {
        let letters = title
            .replacingOccurrences(of: "auth.", with: "")
            .split { !$0.isLetter && !$0.isNumber }
            .prefix(2)
            .compactMap { $0.first }
        let glyph = String(letters.map(Character.init))
        return glyph.isEmpty ? "I" : glyph.uppercased()
    }

    var body: some View {
        ZStack {
            RoundedRectangle(cornerRadius: 8, style: .continuous)
                .fill(filled ? tint : tint.opacity(0.14))

            Text(monogram)
                .font(.system(size: size * (monogram.count > 1 ? 0.36 : 0.44),
                              weight: .bold,
                              design: .default))
                .foregroundStyle(filled ? .white : tint)
                .tracking(-0.3)
        }
        .frame(width: size, height: size)
        .accessibilityHidden(true)
    }
}

enum BrandTint {
    static func color(for host: String) -> Color {
        let key = host.lowercased()
        if key.contains("github") { return Color(red: 0.14, green: 0.16, blue: 0.18) }
        if key.contains("lufthansa") { return Color(red: 0.02, green: 0.09, blue: 0.30) }
        if key.contains("hetzner") { return Color(red: 0.84, green: 0.05, blue: 0.18) }
        if key.contains("notion") { return Color(red: 0.12, green: 0.12, blue: 0.12) }
        if key.contains("apple") { return Color(red: 0.18, green: 0.18, blue: 0.22) }
        if key.contains("reddit") { return Color(red: 1.00, green: 0.27, blue: 0.00) }
        if key.contains("cli") { return Color(red: 0.24, green: 0.26, blue: 0.32) }
        if key.contains("workspace") { return Color(red: 0.26, green: 0.38, blue: 0.88) }
        if key.contains("foss") || key.contains("berlin-mbp") {
            return Color(red: 0.12, green: 0.45, blue: 0.70)
        }
        return IdP.tint
    }
}

struct DeviceRowStyle: ViewModifier {
    func body(content: Content) -> some View {
        content
            .padding(.vertical, 2)
    }
}