//
//  AIWeeklyDigest.swift
//  Reflect
//
//  @Generable model and storage for AI-generated weekly emotional digest.
//

import Foundation
import FoundationModels

/// AI-generated weekly mood digest
@available(iOS 26, *)
@Generable
struct AIWeeklyDigestResponse: Equatable {
    @Guide(description: "An engaging headline summarizing the week's emotional arc (3-7 words)")
    var headline: String

    @Guide(description: "A warm 2-3 sentence summary of the week's mood patterns and notable moments")
    var summary: String

    @Guide(description: "The best moment or strongest positive pattern from the week (1 sentence)")
    var highlight: String

    @Guide(description: "A gentle, actionable intention or suggestion for the coming week (1 sentence)")
    var intention: String

    @Guide(description: "SF Symbol name for the digest icon (e.g., sun.max.fill, leaf.fill, heart.fill)")
    var iconName: String
}

/// Storable weekly digest (Codable for UserDefaults persistence)
struct WeeklyDigest: Codable, Equatable {
    let headline: String
    let summary: String
    let highlight: String
    let intention: String
    let iconName: String
    let generatedAt: Date
    let weekStartDate: Date
    let weekEndDate: Date

    var isFromCurrentWeek: Bool {
        let calendar = Calendar.current
        let now = Date()
        let currentWeekStart = calendar.dateInterval(of: .weekOfYear, for: now)?.start ?? now
        let digestWeekStart = calendar.dateInterval(of: .weekOfYear, for: weekStartDate)?.start ?? weekStartDate
        return calendar.isDate(currentWeekStart, inSameDayAs: digestWeekStart) ||
               calendar.isDate(digestWeekStart, inSameDayAs: calendar.date(byAdding: .weekOfYear, value: -1, to: currentWeekStart)!)
    }

    /// Whether the digest was dismissed by the user
    static var isDismissedKey: String { "weeklyDigestDismissedDate" }

    static func markDismissed() {
        GroupUserDefaults.groupDefaults.set(Date(), forKey: isDismissedKey)
    }

    static func isDismissed(for digest: WeeklyDigest) -> Bool {
        guard let dismissedDate = GroupUserDefaults.groupDefaults.object(forKey: isDismissedKey) as? Date else {
            return false
        }
        return dismissedDate >= digest.generatedAt
    }
}