//
//  ErrorAlertHandler.swift
//  QuickDrop
//
//  Created by Leon Böttger on 25.07.25.
//

import AudioToolbox
import Network
import StoreKit
import SwiftUI
import UserNotifications

#if os(macOS)
import BezelNotification
import Cocoa
#else
import LUI
#endif

class ErrorAlertHandler {
    
    private init() {}
    static let shared = ErrorAlertHandler()
    
    private var isAlertShown = false
    #if os(macOS)
    private var firewallAlertWindow: NSWindow?
    private var apIsolationAlertWindow: NSWindow?
    private var networkFilterAlertWindow: NSWindow?
    #endif
    
    func showErrorAlert(for deviceName: String, error: Error) {
        #if os(macOS)
        NSApp.activate(ignoringOtherApps: true)
        #endif
        
        var description = ""
        let fixInstructions = " " + "Error.FixInstructions".localized()
        
        if let ne = (error as? NearbyError) {
            switch ne {
            case .inputOutput:
                description = "I/O Error." + fixInstructions
            case .protocolError(errorMessage: let errorMessage):
                description = errorMessage + fixInstructions
            case .packetFilterError:
                #if os(macOS)
                openAlert(type: .NetworkFilter)
                return
                #else
                description = error.localizedDescription
                #endif
            case .firewallError:
                #if os(macOS)
                openAlert(type: .Firewall)
                return
                #else
                description = error.localizedDescription
                #endif
            case .requiredFieldMissing(errorMessage: let errorMessage):
                description = errorMessage + fixInstructions
            case .ukey2:
                description = "Error.Crypto".localized() + ": \(ne.localizedDescription)" + fixInstructions
            case .canceled(reason: let reason):
                if reason == .timedOut {
                    description = reason.localizedDescription() + fixInstructions
                }
                else {
                    description = reason.localizedDescription()
                }
            }
        } else {
            description = error.localizedDescription
        }
        
        // Prevent multiple alerts at the same time
        if self.isAlertShown {
            log("Skipping alert for error \(error.localizedDescription) because one is already shown")
            return
        }
        else {
            AudioManager.playErrorSound()
            
            let title = String(format: "TransferError".localized(), arguments: [deviceName])
            log("Showing alert with title: \"\(title)\" and description: \"\(description)\"")
            log("Unsuccessful transmission. Already successful transmissions: \(Settings.shared.incomingTransmissionCount)")
            
            #if os(macOS)
            
            let primaryButtonTitle = "InformDeveloper".localized()
            let secondaryButtonTitle = "CloseAlert".localized()
            
            self.isAlertShown = true
            let alert = NSAlert()
            alert.alertStyle = .critical
            alert.messageText = title
            alert.informativeText = description
            alert.addButton(withTitle: primaryButtonTitle)
            alert.addButton(withTitle: secondaryButtonTitle)
            
            let result = alert.runModal()
            self.isAlertShown = false
            
            if result == .alertFirstButtonReturn {
                //log("Sending logging string")
                //sendLoggingString()
            }
            #else
            showAlert(title: title, message: description)
            #endif
        }
    }
    

    #if os(macOS)
    func openAlert(type: AlertType) {
        log("Opening Alert for \(type)")
        AudioManager.playErrorSound()

        DispatchQueue.main.async { [self] in
            // Create an NSWindow to host the SwiftUI view
            let alertWindow = NSWindow(
                contentRect: NSRect(x: 0, y: 0, width: issueViewWidth, height: issueViewHeight),
                styleMask: [.titled, .closable],
                backing: .buffered,
                defer: false
            )

            switch type {
            case .ApIsolation:
                apIsolationAlertWindow = alertWindow
                alertWindow.contentView = NSHostingView(rootView: ApIsolationIssueView(closeView: { self.apIsolationAlertWindow?.close() }))
            case .NetworkFilter:
                networkFilterAlertWindow = alertWindow
                alertWindow.contentView = NSHostingView(rootView: NetworkFilterIssueView())
            case .Firewall:
                firewallAlertWindow = alertWindow
                alertWindow.contentView = NSHostingView(rootView: FirewallIssueView())
            }

            alertWindow.title = "QuickDrop"
            alertWindow.center()
            alertWindow.isReleasedWhenClosed = false
            alertWindow.setFrameAutosaveName(type.rawValue)

            NSApp.activate(ignoringOtherApps: true)
            alertWindow.makeKeyAndOrderFront(nil)
            alertWindow.level = .normal
        }
    }
    
    
    func closeApIsolationAlert() {
        log("Closing AP Isolation Alert")
        DispatchQueue.main.async {
            self.apIsolationAlertWindow?.close()
            self.apIsolationAlertWindow = nil
        }
    }
    #endif
}


#if os(macOS)
func sendLoggingString() {
    // If we're in an extension, redirect to the main app
    if Bundle.main.bundlePath.hasSuffix(".appex") {
        log("sendLoggingString: in extension, redirecting to main app")
        
        if let url = URL(string: "quickdrop://sendLog") {
            NSWorkspace.shared.open(url)
        }
        return
    }
    
    // We're in the main app – do the actual sending
    if let url = LogManager.sharedInstance.logFileURL {
        let appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "Unknown"
        log("Sending logging string with file URL: \(url)")
        log("Currently running apps: \(NSWorkspace.shared.runningApplications.map { $0.localizedName ?? "Unknown" })")
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3, execute: {
            sendEmailWithAttachment(
                fileURL: url,
                recipients: ["quickdrop@leonboettger.com"],
                subject: "QuickDrop \(appVersion) - \(getDeviceAndSystem())"
            )
        })
    }
}


fileprivate func getDeviceAndSystem() -> String {
    // Get Mac model identifier
    var size: Int = 0
    sysctlbyname("hw.model", nil, &size, nil, 0)
    
    var modelBuffer = [CChar](repeating: 0, count: size)
    sysctlbyname("hw.model", &modelBuffer, &size, nil, 0)
    
    let model = String(cString: modelBuffer)
    
    // Get macOS version
    let version = ProcessInfo.processInfo.operatingSystemVersion
    let versionString = "\(version.majorVersion).\(version.minorVersion).\(version.patchVersion)"
    
    return "\(model) - \(versionString)"
}


func sendEmailWithAttachment(fileURL: URL, recipients: [String], subject: String) {
    guard let emailService = NSSharingService(named: .composeEmail) else {
        log("No email service available")
        return
    }
    
    emailService.recipients = recipients
    emailService.subject = subject
    emailService.perform(withItems: [fileURL])
    
    log("Email service opened with recipients: \(recipients) and subject: \(subject)")
}


func copyToClipboard(_ text: String) {
    let pasteboard = NSPasteboard.general
    pasteboard.clearContents()
    pasteboard.setString(text, forType: .string)
}
#endif


enum AlertType: String {
    case ApIsolation
    case NetworkFilter
    case Firewall
}