//
//  Theme.swift
//  Poche
//
//  Author:  Simon-Pierre Boucher
//  Contact: contact@spboucher.ai
//

import SwiftUI

enum Theme {
    // Brand: indigo → violet. Matches the AccentColor asset.
    static let accentA = Color(red: 0.39, green: 0.35, blue: 0.96)
    static let accentB = Color(red: 0.72, green: 0.33, blue: 0.98)

    static var accentGradient: LinearGradient {
        LinearGradient(
            colors: [accentA, accentB],
            startPoint: .topLeading,
            endPoint: .bottomTrailing
        )
    }

    static let background = Color(.systemGroupedBackground)
    static let surface = Color(.secondarySystemGroupedBackground)

    static let spacingSmall: CGFloat = 6
    static let spacingMedium: CGFloat = 12
    static let spacingLarge: CGFloat = 24

    static let bubbleCornerRadius: CGFloat = 22
    static let cardCornerRadius: CGFloat = 20
}

/// Soft app-wide backdrop: grouped background with a discreet brand wash
/// at the top. Adapts to dark mode through the system colors.
struct AppBackground: View {
    var body: some View {
        ZStack {
            Theme.background
            RadialGradient(
                colors: [Theme.accentA.opacity(0.12), .clear],
                center: .top,
                startRadius: 0,
                endRadius: 520
            )
        }
        .ignoresSafeArea()
    }
}

/// The Poche mark: gradient disc + sparkles.
struct BrandMark: View {
    var size: CGFloat = 30

    var body: some View {
        Circle()
            .fill(Theme.accentGradient)
            .overlay {
                Image(systemName: "sparkles")
                    .font(.system(size: size * 0.48, weight: .semibold))
                    .foregroundStyle(.white)
            }
            .frame(width: size, height: size)
            .shadow(color: Theme.accentA.opacity(0.35), radius: size * 0.18, y: size * 0.08)
    }
}