# <<*>> -^v- SNOWARE APPLICATION
# usage: Check for updates from remote.
# author: S.A.
# time: 2026-06-08
# Copyright (c) [2026] [S.A. SNOWARE-SCU]
# [MineSentinel] is licensed under Mulan PubL v2.
# You can use this software according to the terms and conditions of the Mulan PubL v2.
# You may obtain a copy of Mulan PubL v2 at:
#          http://license.coscl.org.cn/MulanPubL-2.0
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
# See the Mulan PubL v2 for more details.

# frozen_string_literal: true

require 'net/http'
require 'uri'

# @type const RELEASE_SERIAL_CODE: String
RELEASE_SERIAL_CODE = 'b43527c'
# @type const CHANNEL: String
CHANNEL = 'master'
# @type const VERSION_LIST_URL: String
VERSION_LIST_URL = "https://raw.giteeusercontent.com/scu_team/minesentinel/#{CHANNEL}/APP_VERSIONS_LIST"
# @type const RECURSIVE_RETRY_DEPTH: Integer
RECURSIVE_RETRY_DEPTH = 3

class UpdateManager
  # @return [String]
  def self.fetch
    MethodExecutor.record("debug", "updates", "Fetching version list from #{VERSION_LIST_URL}")
    uri = URI(VERSION_LIST_URL)
    response = Net::HTTP.get_response(uri)
    case response.code.to_i
    when 200
      MethodExecutor.record("debug", "updates", "Version list fetched successfully.")
      response.body
    else
      raise "Unexpected HTTP response code: #{response.code}"
    end
  rescue => e
    MethodExecutor.record("error", "updates", "Failed to fetch version list: #{e}")
    nil
  end

  # @return [Hash{Symbol=>Symbol, Symbol=>String}]
  def self.check
    raw = fetch
    if raw.nil?
      MethodExecutor.record("error", "updates", "Version list is empty, cannot check updates.")
      raise "Unknown Error"
    end

    lines = raw.lines(chomp: true)
    lines.each_with_index do |line, index|
      line_num = index + 1
      if line == RELEASE_SERIAL_CODE && line_num == lines.size
        MethodExecutor.record("info", "updates", "Current version #{RELEASE_SERIAL_CODE} is up to date.")
        return { type: :Newest, version: RELEASE_SERIAL_CODE }
      end
    end

    latest = lines.last
    MethodExecutor.record("info", "updates", "Newer version #{latest} available (current: #{RELEASE_SERIAL_CODE}).")
    { type: :NewerAvailable, version: latest }
  end
end