import SwiftUI

/// Onboarding "aha moment" step: shows the freshly auto-filled first week and
/// asks for the weekly reminder with context (instead of a cold OS prompt on Home).
struct WeekReadyStepView: View {
    let filledCount: Int
    var onContinue: () -> Void

    @State private var isRequestingPermission = false
    @State private var reminderGranted = false

    var body: some View {
        VStack(spacing: 24) {
            VStack(spacing: 16) {
                ZStack {
                    Circle()
                        .fill(Color.mealMoodCoral.opacity(0.12))
                        .frame(width: 88, height: 88)
                    Image(systemName: filledCount > 0 ? "checkmark.circle.fill" : "calendar.badge.checkmark")
                        .font(.system(size: 44, weight: .semibold))
                        .foregroundColor(.mealMoodCoral)
                }
                .padding(.top, 24)

                Text("onboarding_week_ready_title")
                    .font(.mealMoodH1)
                    .foregroundColor(.mealMoodTextPrimary)
                    .multilineTextAlignment(.center)
                    .accessibilityIdentifier("onboarding_week_ready_title")

                Text(subtitleText)
                    .font(.mealMoodBody)
                    .foregroundColor(.mealMoodTextSecondary)
                    .multilineTextAlignment(.center)
            }
            .padding(.horizontal, 24)

            VStack(alignment: .leading, spacing: 12) {
                HStack(spacing: 12) {
                    Image(systemName: "bell.badge.fill")
                        .font(.system(size: 22))
                        .foregroundColor(.mealMoodCoral)
                    Text("onboarding_reminder_pitch")
                        .font(.mealMoodSmall)
                        .foregroundColor(.mealMoodTextPrimary)
                        .fixedSize(horizontal: false, vertical: true)
                }
            }
            .padding(16)
            .frame(maxWidth: .infinity, alignment: .leading)
            .background(Color.mealMoodSurface)
            .cornerRadius(14)
            .overlay(
                RoundedRectangle(cornerRadius: 14)
                    .stroke(Color(hex: "#F0F0F0"), lineWidth: 1)
            )
            .padding(.horizontal, 24)

            Spacer(minLength: 0)

            VStack(spacing: 12) {
                PrimaryButton(
                    title: reminderGranted
                        ? String(localized: "onboarding_continue")
                        : String(localized: "onboarding_reminder_allow"),
                    action: {
                        if reminderGranted {
                            onContinue()
                        } else {
                            enableReminders()
                        }
                    }
                )
                .disabled(isRequestingPermission)

                if !reminderGranted {
                    Button {
                        onContinue()
                    } label: {
                        Text("onboarding_reminder_skip")
                            .font(.mealMoodSmall)
                            .foregroundColor(.mealMoodTextSecondary)
                    }
                    .buttonStyle(.plain)
                    .accessibilityIdentifier("onboarding_cta_week_ready_skip")
                }
            }
            .padding(.horizontal, 24)
            .padding(.bottom, 40)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
    }

    private var subtitleText: String {
        if filledCount > 0 {
            return String(format: String(localized: "onboarding_week_ready_subtitle"), filledCount)
        }
        return String(localized: "onboarding_week_ready_subtitle_empty")
    }

    private func enableReminders() {
        isRequestingPermission = true
        Task {
            let granted = await NotificationService.shared.requestPermission()
            NotificationService.shared.remindersEnabled = true
            AnalyticsService.logNotificationsToggled(enabled: granted)
            isRequestingPermission = false
            if granted {
                reminderGranted = true
                HapticManager.shared.notification(type: .success)
                // Small beat so the user sees the button flip before moving on.
                try? await Task.sleep(nanoseconds: 600_000_000)
            }
            onContinue()
        }
    }
}