//
//  AIReport.swift
//  Reflect
//
//  Data models for AI-generated mood reports with PDF export.
//

import Foundation
import FoundationModels

// MARK: - Report Type

enum ReportType: String, CaseIterable {
    case quickSummary = "Quick Summary"
    case detailed = "Detailed Report"

    var icon: String {
        switch self {
        case .quickSummary: return "doc.text"
        case .detailed: return "doc.text.magnifyingglass"
        }
    }

    var description: String {
        switch self {
        case .quickSummary: return "AI overview of your mood patterns"
        case .detailed: return "Week-by-week analysis with full data"
        }
    }
}

// MARK: - Report Entry (decoupled from SwiftData)

struct ReportEntry {
    let date: Date
    let mood: Mood
    let notes: String?
    let weather: WeatherData?
    let reflection: GuidedReflection?

    init(from model: MoodEntryModel) {
        self.date = model.forDate
        self.mood = model.mood
        self.notes = model.notes
        self.weather = model.weatherJSON.flatMap { WeatherData.decode(from: $0) }
        self.reflection = model.reflectionJSON.flatMap { GuidedReflection.decode(from: $0) }
    }
}

// MARK: - Report Overview Stats

struct ReportOverviewStats {
    let totalEntries: Int
    let averageMood: Double
    let moodDistribution: [Mood: Int]
    let trend: String
    let dateRange: String
}

// MARK: - Report Week

struct ReportWeek: Identifiable {
    let id = UUID()
    let weekNumber: Int
    let startDate: Date
    let endDate: Date
    let entries: [ReportEntry]
    var aiSummary: String?
}

// MARK: - Report Month Summary

struct ReportMonthSummary: Identifiable {
    let id = UUID()
    let month: Int
    let year: Int
    let entryCount: Int
    let averageMood: Double
    var aiSummary: String?

    var title: String {
        let formatter = DateFormatter()
        formatter.dateFormat = "MMMM yyyy"
        var components = DateComponents()
        components.month = month
        components.year = year
        let date = Calendar.current.date(from: components) ?? Date()
        return formatter.string(from: date)
    }
}

// MARK: - Report Year Summary

struct ReportYearSummary: Identifiable {
    let id = UUID()
    let year: Int
    let entryCount: Int
    let averageMood: Double
    var aiSummary: String?
}

// MARK: - Assembled Report

struct MoodReport {
    let reportType: ReportType
    let generatedAt: Date
    let overview: ReportOverviewStats
    let weeks: [ReportWeek]
    let monthlySummaries: [ReportMonthSummary]
    let yearlySummaries: [ReportYearSummary]
    var quickSummary: String?
}

// MARK: - @Generable AI Response Structs

@available(iOS 26, *)
@Generable
struct AIWeeklySummary: Equatable {
    @Guide(description: "A clinical, factual summary of the user's mood patterns for this week. Use third-person perspective (e.g., 'The individual'). 2-3 sentences covering mood trends, notable patterns, and any significant changes. Neutral, professional tone suitable for a therapist to read.")
    var summary: String
}

@available(iOS 26, *)
@Generable
struct AIMonthSummary: Equatable {
    @Guide(description: "A clinical, factual summary of the user's mood patterns for this month. Use third-person perspective. 3-4 sentences covering overall mood trend, week-over-week changes, and notable patterns. Professional tone suitable for clinical review.")
    var summary: String
}

@available(iOS 26, *)
@Generable
struct AIYearSummary: Equatable {
    @Guide(description: "A clinical, factual summary of the user's mood patterns for this year. Use third-person perspective. 3-5 sentences covering seasonal patterns, long-term trends, and significant periods. Professional tone suitable for clinical review.")
    var summary: String
}

@available(iOS 26, *)
@Generable
struct AIQuickSummaryResponse: Equatable {
    @Guide(description: "A comprehensive clinical summary of the user's mood data for the selected period. Use third-person perspective (e.g., 'The individual'). 4-6 sentences covering: overall mood patterns, notable trends, day-of-week patterns, and any areas of concern or improvement. Factual, neutral, professional tone suitable for sharing with a therapist.")
    var summary: String

    @Guide(description: "2-3 key clinical observations as brief bullet points. Each should be a single factual sentence about a pattern or trend observed in the data.")
    var keyObservations: [String]

    @Guide(description: "1-2 brief, neutral recommendations based on observed patterns. Frame as observations rather than prescriptions (e.g., 'Mood data suggests weekday routines may benefit from...').")
    var recommendations: [String]
}