LeStorage/LeStorage/MicroStorage.swift

//
//  StoredItem.swift
//  LeStorage
//
//  Created by Laurent Morvillier on 14/02/2024.
//

import Foundation

public protocol MicroStorable : Codable {
    init()
//    static var fileName: String { get }
}

public class MicroStorage<T : MicroStorable> {
    
    public fileprivate(set) var item: T
    
    fileprivate var _fileName: String

    public init(fileName: String) {
        self._fileName = fileName
        var instance: T? = nil
        do {
            let url = try FileUtils.pathForFileInDocumentDirectory(fileName)
            if FileManager.default.fileExists(atPath: url.path()) {
                let jsonString = try FileUtils.readDocumentFile(fileName: fileName)
                if let decoded: T = try jsonString.decode() {
                    instance = decoded
                }
            }
        } catch {
            Logger.error(error)
        }
        
        self.item = instance ?? T()
    }
    
    public func update(handler: (T) -> ()) {
        handler(self.item)
        self.write()
    }
    
    public func write() {
        do {
            let jsonString: String = try self.item.jsonString()
            let _ = try FileUtils.writeToDocumentDirectory(content: jsonString, fileName: self._fileName)
        } catch {
            Logger.error(error)
        }
    }

}

public class OptionalStorage<T : Codable> {
    
    public var item: T? = nil {
        didSet {
            self._write()
        }
    }
    
    fileprivate var _fileName: String
    
    public init(fileName: String) {
        self._fileName = fileName
        do {
            let url = try FileUtils.pathForFileInDocumentDirectory(fileName)
            if FileManager.default.fileExists(atPath: url.path) {
                let jsonString = try FileUtils.readDocumentFile(fileName: fileName)
                if let decoded: T = try jsonString.decode() {
                    self.item = decoded
//                    Logger.log("user loaded with: \(jsonString)")
                }
            }
        } catch {
            Logger.error(error)
        }
    }
    
    fileprivate func _write() {
        
        var content = ""
        if let item = self.item {
            do {
                content = try item.jsonString()
            } catch {
                Logger.error(error)
            }
        }

        do {
            let _ = try FileUtils.writeToDocumentDirectory(content: content, fileName: self._fileName)
        } catch {
            Logger.error(error)
        }

    }

}