# 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 'slop'
require 'rainbow'
require_relative 'args'
require_relative '../backtrace'
require_relative '../log'
require_relative '../id'
require_relative '../wallet'
require_relative '../patch'

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

    # Returns the array of modified wallets (IDs)
    def run(args = [])
      opts = Slop.parse(args, help: true, suppress_errors: true) do |o|
        o.banner = "Usage: zold merge [ID...] [options]
Available options:"
        o.bool '--no-baseline',
          'Don\'t trust any remote copies and re-validate all incoming payments against their wallets',
          default: false
        o.bool '--help', 'Print instructions'
      end
      mine = Args.new(opts, @log).take || return
      mine = @wallets.all if mine.empty?
      modified = []
      mine.map { |i| Id.new(i) }.each do |id|
        next unless merge(id, Copies.new(File.join(@copies, id)), opts)
        modified << id
        require_relative 'propagate'
        modified += Propagate.new(wallets: @wallets, log: @log).run(args)
      end
      modified
    end

    private

    def merge(id, cps, opts)
      cps = cps.all.sort_by { |c| c[:score] }.reverse
      patch = Patch.new(@wallets, log: @log)
      cps.each do |c|
        merge_one(opts, patch, Wallet.new(c[:path]), c[:name])
        @log.debug("Copy ##{c[:name]} merged: #{patch}")
      end
      wallet = @wallets.find(id)
      if wallet.exists?
        merge_one(opts, patch, wallet, 'localhost')
        @log.debug("Local copy merged: #{patch}")
      else
        @log.debug("Local copy is absent, won't merge")
      end
      modified = patch.save(wallet.path, overwrite: true)
      if modified
        @log.debug("#{cps.count} copies merged successfully into #{wallet.id}, balance is #{wallet.balance}")
      else
        @log.debug("Nothing changed in #{wallet.id} after merge of #{cps.count} copies")
      end
      modified
    end

    def merge_one(opts, patch, wallet, name)
      patch.join(wallet, !opts['no-baseline'])
    rescue StandardError => e
      @log.error("Can't merge copy ##{name}: #{e.message}")
      @log.debug(Backtrace.new(e).to_s)
    end
  end
end