//
//  PersistenceService.swift
//  Zyquo Agent
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  JSON persistence in ~/Library/Application Support/ZyquoAgent/:
//    vault.zq                    encrypted API-key vault (SecureKeyStore)
//    Workspaces/                 per-task working directories (WorkspaceManager)
//    settings.json, personas.json, …  generic documents
//
//  Ported from Zyquo Cloud (root folder renamed ZyquoCloud → ZyquoAgent;
//  Cloud's per-conversation persistence is superseded by Agent's Task
//  persistence, which arrives with the Agent layer).
//

import Foundation

struct PersistenceService {
    static let shared = PersistenceService()

    let rootDirectory: URL
    /// Per-task working directories root (Phase 2 Workspace layer).
    var workspacesDirectory: URL { rootDirectory.appendingPathComponent("Workspaces") }

    private let encoder: JSONEncoder
    private let decoder: JSONDecoder

    init(rootDirectory: URL? = nil) {
        let base = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask)[0]
        self.rootDirectory = rootDirectory ?? base.appendingPathComponent("ZyquoAgent")
        encoder = JSONEncoder()
        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
        encoder.dateEncodingStrategy = .iso8601
        decoder = JSONDecoder()
        decoder.dateDecodingStrategy = .iso8601
        try? FileManager.default.createDirectory(at: workspacesDirectory, withIntermediateDirectories: true)
    }

    // MARK: - Generic documents (personas, templates, settings…)

    func load<T: Decodable>(_ type: T.Type, from fileName: String) -> T? {
        let url = rootDirectory.appendingPathComponent(fileName)
        guard let data = try? Data(contentsOf: url) else { return nil }
        return try? decoder.decode(type, from: data)
    }

    func save<T: Encodable>(_ value: T, to fileName: String) {
        let url = rootDirectory.appendingPathComponent(fileName)
        guard let data = try? encoder.encode(value) else { return }
        try? data.write(to: url, options: .atomic)
    }
}