import Foundation
import SwiftUI

@Observable
final class CookieManager {
    static let shared = CookieManager()

    private let cookieKey = "ddys_cookie_string"
    private let defaults = UserDefaults.standard

    var cookieString: String {
        get { defaults.string(forKey: cookieKey) ?? "" }
        set {
            defaults.set(newValue, forKey: cookieKey)
            applyCookies()
        }
    }

    var isAuthenticated: Bool {
        !cookieString.isEmpty
    }

    private init() {
        applyCookies()
    }

    func applyCookies() {
        guard !cookieString.isEmpty else { return }
        let storage = HTTPCookieStorage.shared
        // 清除旧的 ddys cookies
        if let cookies = storage.cookies(for: URL(string: "https://ddys.io")!) {
            for cookie in cookies {
                storage.deleteCookie(cookie)
            }
        }
        // 解析并设置新 cookies
        let pairs = cookieString.split(separator: ";").map { $0.trimmingCharacters(in: .whitespaces) }
        for pair in pairs {
            let parts = pair.split(separator: "=", maxSplits: 1)
            guard parts.count == 2 else { continue }
            let name = String(parts[0]).trimmingCharacters(in: .whitespaces)
            let value = String(parts[1]).trimmingCharacters(in: .whitespaces)
            let properties: [HTTPCookiePropertyKey: Any] = [
                .name: name,
                .value: value,
                .domain: ".ddys.io",
                .path: "/",
                .secure: "TRUE",
            ]
            if let cookie = HTTPCookie(properties: properties) {
                storage.setCookie(cookie)
            }
        }
    }

    func clearCookies() {
        cookieString = ""
        if let cookies = HTTPCookieStorage.shared.cookies(for: URL(string: "https://ddys.io")!) {
            for cookie in cookies {
                HTTPCookieStorage.shared.deleteCookie(cookie)
            }
        }
    }
}