//
//  FeelsVoteWidget.swift
//  FeelsWidget
//
//  Interactive widget for mood voting (iOS 17+)
//

import WidgetKit
import SwiftUI
import AppIntents

// MARK: - App Intent for Mood Voting

struct VoteMoodIntent: AppIntent {
    static var title: LocalizedStringResource = "Vote Mood"
    static var description = IntentDescription("Record your mood for today")

    @Parameter(title: "Mood")
    var moodValue: Int

    init() {
        self.moodValue = 2
    }

    init(mood: Mood) {
        self.moodValue = mood.rawValue
    }

    func perform() async throws -> some IntentResult {
        let mood = Mood(rawValue: moodValue) ?? .average
        let votingDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())

        // Add mood entry
        PersistenceController.shared.add(mood: mood, forDate: votingDate, entryType: .widget)

        // Store last voted date
        let dateString = ISO8601DateFormatter().string(from: Calendar.current.startOfDay(for: votingDate))
        GroupUserDefaults.groupDefaults.set(dateString, forKey: UserDefaultsStore.Keys.lastVotedDate.rawValue)

        // Reload widget timeline
        WidgetCenter.shared.reloadTimelines(ofKind: "FeelsVoteWidget")

        return .result()
    }
}

// MARK: - Vote Widget Provider

struct VoteWidgetProvider: TimelineProvider {
    func placeholder(in context: Context) -> VoteWidgetEntry {
        VoteWidgetEntry(date: Date(), hasSubscription: true, hasVotedToday: false, todaysMood: nil, stats: nil)
    }

    func getSnapshot(in context: Context, completion: @escaping (VoteWidgetEntry) -> Void) {
        let entry = createEntry()
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<VoteWidgetEntry>) -> Void) {
        let entry = createEntry()

        // Refresh at midnight
        let midnight = Calendar.current.startOfDay(for: Calendar.current.date(byAdding: .day, value: 1, to: Date())!)
        let timeline = Timeline(entries: [entry], policy: .after(midnight))
        completion(timeline)
    }

    private func createEntry() -> VoteWidgetEntry {
        let hasSubscription = GroupUserDefaults.groupDefaults.bool(forKey: UserDefaultsStore.Keys.hasActiveSubscription.rawValue)

        let votingDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())
        let dayStart = Calendar.current.startOfDay(for: votingDate)
        let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!

        // Check if user has voted today
        let todayEntry = PersistenceController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
        let hasVotedToday = todayEntry != nil && todayEntry?.mood != .missing && todayEntry?.mood != .placeholder

        // Get today's mood if voted
        let todaysMood: Mood? = hasVotedToday ? todayEntry?.mood : nil

        // Get stats for display after voting
        var stats: MoodStats? = nil
        if hasVotedToday {
            let allEntries = PersistenceController.shared.getAllData()
            let validEntries = allEntries.filter { $0.mood != .missing && $0.mood != .placeholder }
            let totalCount = validEntries.count

            if totalCount > 0 {
                var moodCounts: [Mood: Int] = [:]
                for entry in validEntries {
                    moodCounts[entry.mood, default: 0] += 1
                }
                stats = MoodStats(totalEntries: totalCount, moodCounts: moodCounts)
            }
        }

        return VoteWidgetEntry(
            date: Date(),
            hasSubscription: hasSubscription,
            hasVotedToday: hasVotedToday,
            todaysMood: todaysMood,
            stats: stats
        )
    }
}

// MARK: - Stats Model

struct MoodStats {
    let totalEntries: Int
    let moodCounts: [Mood: Int]

    func percentage(for mood: Mood) -> Double {
        guard totalEntries > 0 else { return 0 }
        return Double(moodCounts[mood, default: 0]) / Double(totalEntries) * 100
    }
}

// MARK: - Timeline Entry

struct VoteWidgetEntry: TimelineEntry {
    let date: Date
    let hasSubscription: Bool
    let hasVotedToday: Bool
    let todaysMood: Mood?
    let stats: MoodStats?
}

// MARK: - Widget Views

struct FeelsVoteWidgetEntryView: View {
    @Environment(\.widgetFamily) var family
    var entry: VoteWidgetProvider.Entry

    var body: some View {
        Group {
            if entry.hasSubscription {
                if entry.hasVotedToday {
                    // Show stats after voting
                    VotedStatsView(entry: entry)
                } else {
                    // Show voting buttons
                    VotingView(family: family)
                }
            } else {
                // Non-subscriber view - tap to open app
                NonSubscriberView()
            }
        }
        .containerBackground(.fill.tertiary, for: .widget)
    }
}

// MARK: - Voting View (for subscribers who haven't voted)

struct VotingView: View {
    let family: WidgetFamily
    let moods: [Mood] = [.horrible, .bad, .average, .good, .great]

    var body: some View {
        VStack(spacing: 8) {
            Text("How are you feeling?")
                .font(.headline)
                .foregroundStyle(.primary)

            if family == .systemSmall {
                // Compact layout for small widget
                LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible()), GridItem(.flexible())], spacing: 8) {
                    ForEach(moods, id: \.rawValue) { mood in
                        MoodButton(mood: mood, isCompact: true)
                    }
                }
            } else {
                // Horizontal layout for medium/large
                HStack(spacing: 12) {
                    ForEach(moods, id: \.rawValue) { mood in
                        MoodButton(mood: mood, isCompact: false)
                    }
                }
            }
        }
        .padding()
    }
}

struct MoodButton: View {
    let mood: Mood
    let isCompact: Bool

    private var moodTint: MoodTintable.Type {
        UserDefaultsStore.moodTintable()
    }

    private var moodImages: MoodImagable.Type {
        UserDefaultsStore.moodMoodImagable()
    }

    var body: some View {
        Button(intent: VoteMoodIntent(mood: mood)) {
            VStack(spacing: 4) {
                moodImages.icon(forMood: mood)
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .frame(width: isCompact ? 28 : 36, height: isCompact ? 28 : 36)
                    .foregroundColor(moodTint.color(forMood: mood))

                if !isCompact {
                    Text(mood.strValue)
                        .font(.caption2)
                        .foregroundStyle(.secondary)
                }
            }
        }
        .buttonStyle(.plain)
    }
}

// MARK: - Voted Stats View (shown after voting)

struct VotedStatsView: View {
    let entry: VoteWidgetEntry

    private var moodTint: MoodTintable.Type {
        UserDefaultsStore.moodTintable()
    }

    private var moodImages: MoodImagable.Type {
        UserDefaultsStore.moodMoodImagable()
    }

    var body: some View {
        VStack(spacing: 12) {
            // Today's mood
            if let mood = entry.todaysMood {
                HStack(spacing: 8) {
                    moodImages.icon(forMood: mood)
                        .resizable()
                        .aspectRatio(contentMode: .fit)
                        .frame(width: 32, height: 32)
                        .foregroundColor(moodTint.color(forMood: mood))

                    VStack(alignment: .leading, spacing: 2) {
                        Text("Today")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                        Text(mood.strValue)
                            .font(.headline)
                            .foregroundColor(moodTint.color(forMood: mood))
                    }

                    Spacer()
                }
            }

            // Stats
            if let stats = entry.stats {
                Divider()

                VStack(spacing: 4) {
                    Text("\(stats.totalEntries) entries")
                        .font(.caption)
                        .foregroundStyle(.secondary)

                    HStack(spacing: 4) {
                        ForEach([Mood.great, .good, .average, .bad, .horrible], id: \.rawValue) { mood in
                            let percentage = stats.percentage(for: mood)
                            if percentage > 0 {
                                RoundedRectangle(cornerRadius: 2)
                                    .fill(moodTint.color(forMood: mood))
                                    .frame(width: max(4, CGFloat(percentage) * 0.8))
                            }
                        }
                    }
                    .frame(height: 8)
                }
            }
        }
        .padding()
    }
}

// MARK: - Non-Subscriber View

struct NonSubscriberView: View {
    var body: some View {
        Link(destination: URL(string: "feels://subscribe")!) {
            VStack(spacing: 8) {
                Image(systemName: "heart.fill")
                    .font(.largeTitle)
                    .foregroundStyle(.pink)

                Text("Track Your Mood")
                    .font(.headline)
                    .foregroundStyle(.primary)

                Text("Tap to subscribe")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                    .multilineTextAlignment(.center)
            }
            .padding()
            .frame(maxWidth: .infinity, maxHeight: .infinity)
        }
    }
}

// MARK: - Widget Configuration

struct FeelsVoteWidget: Widget {
    let kind: String = "FeelsVoteWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: VoteWidgetProvider()) { entry in
            FeelsVoteWidgetEntryView(entry: entry)
        }
        .configurationDisplayName("Mood Vote")
        .description("Quickly rate your mood for today")
        .supportedFamilies([.systemSmall, .systemMedium])
    }
}

// MARK: - Preview

#Preview(as: .systemSmall) {
    FeelsVoteWidget()
} timeline: {
    VoteWidgetEntry(date: Date(), hasSubscription: true, hasVotedToday: false, todaysMood: nil, stats: nil)
    VoteWidgetEntry(date: Date(), hasSubscription: true, hasVotedToday: true, todaysMood: .great, stats: MoodStats(totalEntries: 30, moodCounts: [.great: 10, .good: 12, .average: 5, .bad: 2, .horrible: 1]))
    VoteWidgetEntry(date: Date(), hasSubscription: false, hasVotedToday: false, todaysMood: nil, stats: nil)
}