import Foundation
import AppKit

class ClashResourceManager {
    static let kProxyConfigFolder = (NSHomeDirectory() as NSString).appendingPathComponent("/.config/clash")

    static func check() -> Bool {
        checkConfigDir()
        checkMMDB()
        upgardeYmlExtensionName()
        checkAndRemoveOldErrorConfig()
        return true
    }
    
    static func checkConfigDir() {
        var isDir : ObjCBool = true
        
        if !FileManager.default.fileExists(atPath: kProxyConfigFolder, isDirectory:&isDir) {
            do {
                try FileManager.default.createDirectory(atPath: kProxyConfigFolder, withIntermediateDirectories: true, attributes: nil)
            } catch {
                showCreateConfigDirFailAlert()
            }
        }
    }
    
    static func checkMMDB() {
        let fileManage = FileManager.default
        let destMMDBPath = "\(kProxyConfigFolder)/Country.mmdb"
        
        // Remove old mmdb file after version update.
        if fileManage.fileExists(atPath: destMMDBPath) {
            if AppVersionUtil.hasVersionChanged || AppVersionUtil.isFirstLaunch {
                try? fileManage.removeItem(atPath: destMMDBPath)
            }
        }
        
        
        if !fileManage.fileExists(atPath: destMMDBPath) {
            if let mmdbPath = Bundle.main.path(forResource: "Country", ofType: "mmdb") {
                try? fileManage.copyItem(at: URL(fileURLWithPath: mmdbPath), to: URL(fileURLWithPath: destMMDBPath))
            }
        }
    }
    
    static func checkAndRemoveOldErrorConfig() {
        if FileManager.default.fileExists(atPath: kDefaultConfigFilePath) {
            do {
                let defaultConfigData = try Data(contentsOf: URL(fileURLWithPath: kDefaultConfigFilePath))
                var checkSum: UInt8 = 0
                for byte in defaultConfigData {
                    checkSum &+= byte
                }
                
                if checkSum == 101 {
                    // old error config
                    Logger.log("removing old config.yaml")
                    try FileManager.default.removeItem(atPath: kDefaultConfigFilePath)
                }
            } catch let err {
                Logger.log("removing old config.yaml fail: \(err.localizedDescription)")
            }
        }
    }
    
    static func upgardeYmlExtensionName() {
        do {
            let fileURLs = try FileManager.default.contentsOfDirectory(at: URL(fileURLWithPath: kConfigFolderPath, isDirectory: true), includingPropertiesForKeys: nil, options: [.skipsSubdirectoryDescendants])
            
            for upgradeUrl in fileURLs.filter({$0.pathExtension == "yml" }) {
                let dest = upgradeUrl.deletingPathExtension().appendingPathExtension("yaml")
                try FileManager.default.moveItem(at: upgradeUrl, to: dest)
            }
            
        } catch let err {
            Logger.log(err.localizedDescription)
        }
        
    }
        
    static func showCreateConfigDirFailAlert() {
        let alert = NSAlert()
        alert.messageText = NSLocalizedString("ClashX fail to create ~/.config/clash folder. Please check privileges or manually create folder and restart ClashX.", comment: "")
        alert.alertStyle = .warning
        alert.addButton(withTitle: NSLocalizedString("Quit", comment: ""))
        alert.runModal()
        NSApplication.shared.terminate(nil)
    }
    
    
    

}