# Copyright (c) 2018 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the 'Software'), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

require 'uri'
require 'json'
require 'time'
require 'slop'
require_relative '../log'
require_relative '../http'
require_relative '../score'
require_relative '../copies'

# FETCH command.
# Author:: Yegor Bugayenko (yegor256@gmail.com)
# Copyright:: Copyright (c) 2018 Yegor Bugayenko
# License:: MIT
module Zold
  # FETCH pulling command
  class Fetch
    def initialize(remotes:, copies:, log: Log::Quiet.new)
      @remotes = remotes
      @copies = copies
      @log = log
    end

    def run(args = [])
      opts = Slop.parse(args, help: true, suppress_errors: true) do |o|
        o.banner = "Usage: zold fetch [ID...] [options]
Available options:"
        o.bool '--ignore-score-weakness',
          'Don\'t complain when their score is too weak',
          default: false
        o.array '--ignore-node',
          'Ignore this node and don\'t fetch from it',
          default: []
        o.bool '--help', 'Print instructions'
      end
      if opts.help?
        @log.info(opts.to_s)
        return
      end
      mine = opts.arguments[1..-1]
      raise 'At least one wallet ID is required' if mine.empty?
      mine.each do |id|
        fetch(id, Copies.new(File.join(@copies, id)), opts)
      end
    end

    def fetch(id, cps, opts)
      total = 0
      @remotes.all.each do |r|
        done = fetch_one(id, r, cps, opts)
        if done
          total += 1
        else
          @remotes.error(r[:host], r[:port])
        end
      end
      @log.debug("#{total} copies fetched, there are #{cps.all.count} available locally")
    end

    def fetch_one(id, r, cps, opts)
      address = "#{r[:host]}:#{r[:port]}".downcase
      if opts['ignore-node'].include?(address)
        @log.info("#{address} ignored because of --ignore-node")
        return false
      end
      uri = URI("#{r[:home]}wallet/#{id}")
      res = Http.new(uri).get
      unless res.code == '200'
        @log.error("#{address} #{Rainbow(res.code).red}/#{res.message} at #{uri}")
        return false
      end
      json = JSON.parse(res.body)
      score = Score.parse_json(json['score'])
      unless score.valid?
        @log.error("#{address}: invalid score")
        return false
      end
      if score.expired?
        @log.error("#{address}: score expired")
        return false
      end
      if score.strength < Score::STRENGTH && !opts['ignore-score-weakness']
        @log.error("#{address} score is too weak: #{score.strength} (<#{Score::STRENGTH})")
        return false
      end
      cps.add(json['body'], score.host, score.port, score.value)
      @log.info("#{address} #{json['body'].length}b/#{Rainbow(score.value).green} (v.#{json['version']})")
      true
    end
  end
end