//
//  DailyNotificationCallbacks.swift
//  DailyNotificationPlugin
//
//  Created by Matthew Raymer on 2025-09-22
//  Copyright © 2025 TimeSafari. All rights reserved.
//

import Foundation
import CoreData

/**
 * Callback management for iOS Daily Notification Plugin
 * Implements HTTP and local callback delivery with error handling
 * 
 * @author Matthew Raymer
 * @version 1.1.0
 * @created 2025-09-22 09:22:32 UTC
 */
extension DailyNotificationPlugin {
    
    // MARK: - Callback Management
    
    @objc func registerCallback(_ call: CAPPluginCall) {
        guard let name = call.getString("name"),
              let callbackConfig = call.getObject("callback") else {
            call.reject("Callback name and config required")
            return
        }
        
        print("DNP-PLUGIN: Registering callback: \(name)")
        
        do {
            try registerCallback(name: name, config: callbackConfig)
            call.resolve()
        } catch {
            print("DNP-PLUGIN: Failed to register callback: \(error)")
            call.reject("Callback registration failed: \(error.localizedDescription)")
        }
    }
    
    @objc func unregisterCallback(_ call: CAPPluginCall) {
        guard let name = call.getString("name") else {
            call.reject("Callback name required")
            return
        }
        
        print("DNP-PLUGIN: Unregistering callback: \(name)")
        
        do {
            try unregisterCallback(name: name)
            call.resolve()
        } catch {
            print("DNP-PLUGIN: Failed to unregister callback: \(error)")
            call.reject("Callback unregistration failed: \(error.localizedDescription)")
        }
    }
    
    @objc func getRegisteredCallbacks(_ call: CAPPluginCall) {
        Task {
            do {
                let callbacks = try await getRegisteredCallbacks()
                call.resolve(["callbacks": callbacks])
            } catch {
                print("DNP-PLUGIN: Failed to get registered callbacks: \(error)")
                call.reject("Callback retrieval failed: \(error.localizedDescription)")
            }
        }
    }
    
    // MARK: - Content Management
    
    @objc func getContentCache(_ call: CAPPluginCall) {
        Task {
            do {
                let cache = try await getContentCache()
                call.resolve(cache)
            } catch {
                print("DNP-PLUGIN: Failed to get content cache: \(error)")
                call.reject("Content cache retrieval failed: \(error.localizedDescription)")
            }
        }
    }
    
    @objc func clearContentCache(_ call: CAPPluginCall) {
        Task {
            do {
                try await clearContentCache()
                call.resolve()
            } catch {
                print("DNP-PLUGIN: Failed to clear content cache: \(error)")
                call.reject("Content cache clearing failed: \(error.localizedDescription)")
            }
        }
    }
    
    @objc func getContentHistory(_ call: CAPPluginCall) {
        Task {
            do {
                let history = try await getContentHistory()
                call.resolve(["history": history])
            } catch {
                print("DNP-PLUGIN: Failed to get content history: \(error)")
                call.reject("Content history retrieval failed: \(error.localizedDescription)")
            }
        }
    }
    
    // MARK: - Private Callback Implementation
    
    private func fireCallbacks(eventType: String, payload: [String: Any]) async throws {
        // Get registered callbacks from Core Data
        let context = persistenceController.container.viewContext
        let request: NSFetchRequest<Callback> = Callback.fetchRequest()
        request.predicate = NSPredicate(format: "enabled == YES")
        
        let callbacks = try context.fetch(request)
        
        for callback in callbacks {
            do {
                try await deliverCallback(callback: callback, eventType: eventType, payload: payload)
            } catch {
                print("DNP-CB-FAILURE: Callback \(callback.id ?? "unknown") failed: \(error)")
            }
        }
    }
    
    private func deliverCallback(callback: Callback, eventType: String, payload: [String: Any]) async throws {
        guard let callbackId = callback.id,
              let kind = callback.kind else { return }
        
        let event = [
            "id": callbackId,
            "at": Date().timeIntervalSince1970,
            "type": eventType,
            "payload": payload
        ] as [String: Any]
        
        switch kind {
        case "http":
            try await deliverHttpCallback(callback: callback, event: event)
        case "local":
            try await deliverLocalCallback(callback: callback, event: event)
        default:
            print("DNP-CB-UNKNOWN: Unknown callback kind: \(kind)")
        }
    }
    
    private func deliverHttpCallback(callback: Callback, event: [String: Any]) async throws {
        guard let target = callback.target,
              let url = URL(string: target) else {
            throw NSError(domain: "DailyNotificationPlugin", code: 1, userInfo: [NSLocalizedDescriptionKey: "Invalid callback target"])
        }
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.httpBody = try JSONSerialization.data(withJSONObject: event)
        
        let (_, response) = try await URLSession.shared.data(for: request)
        
        guard let httpResponse = response as? HTTPURLResponse,
              httpResponse.statusCode == 200 else {
            throw NSError(domain: "DailyNotificationPlugin", code: 2, userInfo: [NSLocalizedDescriptionKey: "HTTP callback failed"])
        }
        
        print("DNP-CB-HTTP-SUCCESS: HTTP callback delivered to \(target)")
    }
    
    private func deliverLocalCallback(callback: Callback, event: [String: Any]) async throws {
        // Local callback implementation would go here
        print("DNP-CB-LOCAL: Local callback delivered for \(callback.id ?? "unknown")")
    }
    
    private func registerCallback(name: String, config: [String: Any]) throws {
        let context = persistenceController.container.viewContext
        
        let callback = Callback(context: context)
        callback.id = name
        callback.kind = config["kind"] as? String ?? "local"
        callback.target = config["target"] as? String ?? ""
        callback.enabled = true
        callback.createdAt = Date()
        
        try context.save()
        print("DNP-CB-REGISTER: Callback \(name) registered")
    }
    
    private func unregisterCallback(name: String) throws {
        let context = persistenceController.container.viewContext
        let request: NSFetchRequest<Callback> = Callback.fetchRequest()
        request.predicate = NSPredicate(format: "id == %@", name)
        
        let callbacks = try context.fetch(request)
        for callback in callbacks {
            context.delete(callback)
        }
        
        try context.save()
        print("DNP-CB-UNREGISTER: Callback \(name) unregistered")
    }
    
    private func getRegisteredCallbacks() async throws -> [String] {
        let context = persistenceController.container.viewContext
        let request: NSFetchRequest<Callback> = Callback.fetchRequest()
        
        let callbacks = try context.fetch(request)
        return callbacks.compactMap { $0.id }
    }
    
    private func getContentCache() async throws -> [String: Any] {
        guard let latestContent = try await getLatestContent() else {
            return [:]
        }
        return latestContent
    }
    
    private func clearContentCache() async throws {
        let context = persistenceController.container.viewContext
        let request: NSFetchRequest<ContentCache> = ContentCache.fetchRequest()
        
        let results = try context.fetch(request)
        for content in results {
            context.delete(content)
        }
        
        try context.save()
        print("DNP-CACHE-CLEAR: Content cache cleared")
    }
    
    private func getContentHistory() async throws -> [[String: Any]] {
        let context = persistenceController.container.viewContext
        let request: NSFetchRequest<History> = History.fetchRequest()
        request.sortDescriptors = [NSSortDescriptor(keyPath: \History.occurredAt, ascending: false)]
        request.fetchLimit = 100
        
        let results = try context.fetch(request)
        return results.map { history in
            [
                "id": history.id ?? "",
                "kind": history.kind ?? "",
                "occurredAt": history.occurredAt?.timeIntervalSince1970 ?? 0,
                "outcome": history.outcome ?? "",
                "durationMs": history.durationMs
            ]
        }
    }
    
    private func getHealthStatus() async throws -> [String: Any] {
        let context = persistenceController.container.viewContext
        
        // Get next runs (simplified)
        let nextRuns = [Date().addingTimeInterval(3600).timeIntervalSince1970,
                       Date().addingTimeInterval(86400).timeIntervalSince1970]
        
        // Get recent history
        let historyRequest: NSFetchRequest<History> = History.fetchRequest()
        historyRequest.predicate = NSPredicate(format: "occurredAt >= %@", Date().addingTimeInterval(-86400) as NSDate)
        historyRequest.sortDescriptors = [NSSortDescriptor(keyPath: \History.occurredAt, ascending: false)]
        historyRequest.fetchLimit = 10
        
        let recentHistory = try context.fetch(historyRequest)
        let lastOutcomes = recentHistory.map { $0.outcome ?? "" }
        
        // Get cache age
        let cacheRequest: NSFetchRequest<ContentCache> = ContentCache.fetchRequest()
        cacheRequest.sortDescriptors = [NSSortDescriptor(keyPath: \ContentCache.fetchedAt, ascending: false)]
        cacheRequest.fetchLimit = 1
        
        let latestCache = try context.fetch(cacheRequest).first
        let cacheAgeMs = latestCache?.fetchedAt?.timeIntervalSinceNow ?? 0
        
        return [
            "nextRuns": nextRuns,
            "lastOutcomes": lastOutcomes,
            "cacheAgeMs": abs(cacheAgeMs * 1000),
            "staleArmed": abs(cacheAgeMs) > 3600,
            "queueDepth": recentHistory.count,
            "circuitBreakers": [
                "total": 0,
                "open": 0,
                "failures": 0
            ],
            "performance": [
                "avgFetchTime": 0,
                "avgNotifyTime": 0,
                "successRate": 1.0
            ]
        ]
    }
}