//
// NotificationManager.swift
// IceGlass
//
// Copyright 2026 Rouslan Zenetl. All Rights Reserved.
//

import Foundation
import UniformTypeIdentifiers
import UserNotifications

class NotificationManager: @unchecked Sendable {
    private let logger = IceGlassLogger(
        subsystem: Bundle.main.bundleIdentifier ?? "dev.rzen.indie.IceGlass",
        category: "NotificationManager"
    )

    static let shared = NotificationManager()

    /// Track which game starts we've already notified about
    private var gameStartsSent = Set<Int>()

    /// Track which score changes we've already notified about (gameId-awayScore-homeScore)
    private var scoreChangesSent = Set<String>()

    private init() {
        logger.info("Initializing")
        requestNotificationPermissions()
    }

    private func requestNotificationPermissions() {
        UNUserNotificationCenter.current().getNotificationSettings { [weak self] settings in
            guard let self = self else { return }

            self.logger.info("Current notification settings: \(settings.authorizationStatus.rawValue)")

            UNUserNotificationCenter.current().requestAuthorization(
                options: [.alert, .sound, .provisional, .badge]
            ) { [weak self] granted, error in
                guard let self = self else { return }

                if let error = error {
                    self.logger.error("Failed to request notification permission: \(error.localizedDescription)")
                }
                if granted {
                    self.logger.info("Notification permission granted")
                } else {
                    self.logger.warning("Notification permission denied")
                }
            }
        }
    }

    // MARK: - Game Started

    func notifyGameStarted(_ game: Scoreboard.Game, bypassDedup: Bool = false) {
        if !bypassDedup {
            guard !gameStartsSent.contains(game.id) else { return }
            gameStartsSent.insert(game.id)
        }

        let content = UNMutableNotificationContent()
        content.title = "Game Started"
        content.body = "\(game.awayTeam.abbrev) @ \(game.homeTeam.abbrev)"
        content.sound = .default
        content.interruptionLevel = .active
        content.userInfo = ["url": game.gameCenterUrl]

        // Attach away team logo (visiting team at the other team's arena)
        if let attachment = teamLogoAttachment(for: game.awayTeam.abbrev) {
            content.attachments = [attachment]
        }

        let identifier = bypassDedup
            ? "game-start-test-\(UUID().uuidString)"
            : "game-start-\(game.id)"

        let request = UNNotificationRequest(
            identifier: identifier,
            content: content,
            trigger: UNTimeIntervalNotificationTrigger(timeInterval: 0.1, repeats: false)
        )

        UNUserNotificationCenter.current().add(request) { [weak self] error in
            if let error = error {
                self?.logger.error("Error sending game start notification: \(error.localizedDescription)")
            } else {
                self?.logger.info("Game start notification sent for \(game.awayTeam.abbrev) @ \(game.homeTeam.abbrev)")
            }
        }
    }

    // MARK: - Goal Scored

    func notifyGoalScored(_ game: Scoreboard.Game, scoringTeam: Scoreboard.Game.Team, bypassDedup: Bool = false) {
        let awayScore = game.awayTeam.score ?? 0
        let homeScore = game.homeTeam.score ?? 0
        let key = "\(game.id)-\(awayScore)-\(homeScore)"

        if !bypassDedup {
            guard !scoreChangesSent.contains(key) else { return }
            scoreChangesSent.insert(key)
        }

        let content = UNMutableNotificationContent()
        content.title = "\(scoringTeam.abbrev) Goal!"
        content.body = "\(game.awayTeam.abbrev) \(awayScore) : \(game.homeTeam.abbrev) \(homeScore)"
        content.sound = UNNotificationSound(named: UNNotificationSoundName("Glass"))
        content.interruptionLevel = .active
        content.userInfo = ["url": game.gameCenterUrl]

        // Attach scoring team's logo
        if let attachment = teamLogoAttachment(for: scoringTeam.abbrev) {
            content.attachments = [attachment]
        }

        let identifier = bypassDedup
            ? "goal-test-\(UUID().uuidString)"
            : "goal-\(key)"

        let request = UNNotificationRequest(
            identifier: identifier,
            content: content,
            trigger: UNTimeIntervalNotificationTrigger(timeInterval: 0.1, repeats: false)
        )

        UNUserNotificationCenter.current().add(request) { [weak self] error in
            if let error = error {
                self?.logger.error("Error sending goal notification: \(error.localizedDescription)")
            } else {
                self?.logger.info("Goal notification sent: \(scoringTeam.abbrev) scored, \(awayScore):\(homeScore)")
            }
        }
    }

    // MARK: - Team Logo Attachment

    /// Creates a UNNotificationAttachment from the bundled team logo PNG
    private func teamLogoAttachment(for teamAbbrev: String) -> UNNotificationAttachment? {
        // Look for PNG in the TeamLogos bundle directory
        guard let logoURL = Bundle.main.url(forResource: teamAbbrev, withExtension: "png", subdirectory: "TeamLogos") else {
            logger.debug("No logo found for \(teamAbbrev)")
            return nil
        }

        // UNNotificationAttachment needs its own copy in a temp directory
        let tempDir = FileManager.default.temporaryDirectory
            .appendingPathComponent("team-logos", isDirectory: true)
        try? FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)

        let tempFile = tempDir.appendingPathComponent("\(teamAbbrev)-\(UUID().uuidString).png")

        do {
            try FileManager.default.copyItem(at: logoURL, to: tempFile)
            let attachment = try UNNotificationAttachment(
                identifier: "team-logo-\(teamAbbrev)",
                url: tempFile,
                options: [
                    UNNotificationAttachmentOptionsTypeHintKey: UTType.png.identifier,
                    UNNotificationAttachmentOptionsThumbnailHiddenKey: false
                ]
            )
            return attachment
        } catch {
            logger.error("Failed to create logo attachment for \(teamAbbrev): \(error.localizedDescription)")
            return nil
        }
    }

    func resetForNewDay() {
        logger.debug("Resetting notification tracking for new day")
        gameStartsSent.removeAll()
        scoreChangesSent.removeAll()
    }
}