class Bundler::Resolver

# File bundler/resolver.rb, line 11
def initialize(source_requirements, base, gem_version_promoter, additional_base_requirements, platforms)
  @source_requirements = source_requirements
  @base = Resolver::Base.new(base, additional_base_requirements)
  @resolver = Molinillo::Resolver.new(self, self)
  @results_for = {}
  @search_for = {}
  @platforms = platforms
  @resolving_only_for_ruby = platforms == [Gem::Platform::RUBY]
  @gem_version_promoter = gem_version_promoter
end

# File bundler/resolver.rb, line 89
def after_resolution
  Bundler.ui.info ""
end

# File bundler/resolver.rb, line 85
def before_resolution
  Bundler.ui.info "Resolving dependencies...", debug?
end

# File bundler/resolver.rb, line 68
def debug(depth = 0)
  return unless debug?
  debug_info = yield
  debug_info = debug_info.inspect unless debug_info.is_a?(String)
  puts debug_info.split("\n").map {|s| depth == 0 ? "BUNDLER: #{s}" : "BUNDLER(#{depth}): #{s}" }
end

# File bundler/resolver.rb, line 75
def debug?
  return @debug_mode if defined?(@debug_mode)
  @debug_mode =
    ENV["BUNDLER_DEBUG_RESOLVER"] ||
    ENV["BUNDLER_DEBUG_RESOLVER_TREE"] ||
    ENV["DEBUG_RESOLVER"] ||
    ENV["DEBUG_RESOLVER_TREE"] ||
    false
end

# File bundler/resolver.rb, line 99
def dependencies_for(specification)
  specification.dependencies_for_activated_platforms
end

# File bundler/resolver.rb, line 136
def index_for(dependency)
  source_for(dependency.name).specs
end

# File bundler/resolver.rb, line 93
def indicate_progress
  Bundler.ui.info ".", false unless debug?
end

# File bundler/resolver.rb, line 148
def name_for(dependency)
  dependency.name
end

# File bundler/resolver.rb, line 152
def name_for_explicit_dependency_source
  Bundler.default_gemfile.basename.to_s
rescue StandardError
  "Gemfile"
end

# File bundler/resolver.rb, line 158
def requirement_satisfied_by?(requirement, activated, spec)
  requirement.matches_spec?(spec) || spec.source.is_a?(Source::Gemspec)
end

# File bundler/resolver.rb, line 144
def results_for(dependency)
  @results_for[dependency] ||= index_for(dependency).search(dependency)
end

# File bundler/resolver.rb, line 103
def search_for(dependency)
  @search_for[dependency] ||= begin
    name = dependency.name
    locked_results = @base[name].select {|spec| requirement_satisfied_by?(dependency, nil, spec) }
    locked_requirement = base_requirements[name]
    results = results_for(dependency) + locked_results
    results = results.select {|spec| requirement_satisfied_by?(locked_requirement, nil, spec) } if locked_requirement
    dep_platforms = dependency.gem_platforms(@platforms)

    @gem_version_promoter.sort_versions(dependency, results).group_by(&:version).reduce([]) do |groups, (_, specs)|
      relevant_platforms = dep_platforms.select {|platform| specs.any? {|spec| spec.match_platform(platform) } }
      next groups unless relevant_platforms.any?

      ruby_specs = select_best_platform_match(specs, Gem::Platform::RUBY)
      if ruby_specs.any?
        spec_group_ruby = SpecGroup.new(ruby_specs, [Gem::Platform::RUBY])
        spec_group_ruby.force_ruby_platform = dependency.force_ruby_platform
        groups << spec_group_ruby
      end

      next groups if @resolving_only_for_ruby || dependency.force_ruby_platform

      platform_specs = relevant_platforms.flat_map {|platform| select_best_platform_match(specs, platform) }
      next groups if platform_specs == ruby_specs

      spec_group = SpecGroup.new(platform_specs, relevant_platforms)
      groups << spec_group

      groups
    end
  end
end

# File bundler/resolver.rb, line 162
def sort_dependencies(dependencies, activated, conflicts)
  dependencies.sort_by do |dependency|
    name = name_for(dependency)
    vertex = activated.vertex_named(name)
    [
      @base[name].any? ? 0 : 1,
      vertex.payload ? 0 : 1,
      vertex.root? ? 0 : 1,
      amount_constrained(dependency),
      conflicts[name] ? 0 : 1,
      vertex.payload ? 0 : search_for(dependency).count,
    ]
  end
end

# File bundler/resolver.rb, line 140
def source_for(name)
  @source_requirements[name] || @source_requirements[:default]
end

# File bundler/resolver.rb, line 22
def start(requirements, exclude_specs: [])
  @metadata_requirements, regular_requirements = requirements.partition {|dep| dep.name.end_with?("\0") }

  exclude_specs.each do |spec|
    remove_from_candidates(spec)
  end

  requirements.each {|dep| prerelease_specified[dep.name] ||= dep.prerelease? }

  verify_gemfile_dependencies_are_found!(requirements)
  result = @resolver.resolve(requirements).
    map(&:payload).
    reject {|sg| sg.name.end_with?("\0") }.
    map(&:to_specs).
    flatten

  SpecSet.new(SpecSet.new(result).for(regular_requirements, false, @platforms))
rescue Molinillo::VersionConflict => e
  conflicts = e.conflicts

  deps_to_unlock = conflicts.values.inject([]) do |deps, conflict|
    deps |= conflict.requirement_trees.flatten.map {|req| base_requirements[req.name] }.compact
  end

  if deps_to_unlock.any?
    @base.unlock_deps(deps_to_unlock)
    reset_spec_cache
    retry
  end

  message = version_conflict_message(e)
  raise VersionConflict.new(conflicts.keys.uniq, message)
rescue Molinillo::CircularDependencyError => e
  names = e.dependencies.sort_by(&:name).map {|d| "gem '#{d.name}'" }
  raise CyclicDependencyError, "Your bundle requires gems that depend" \
    " on each other, creating an infinite loop. Please remove" \
    " #{names.count > 1 ? "either " : ""}#{names.join(" or ")}" \
    " and try again."
end

# File bundler/resolver.rb, line 210
def amount_constrained(dependency)
  @amount_constrained ||= {}
  @amount_constrained[dependency.name] ||= if (base = @base[dependency.name]) && !base.empty?
    dependency.requirement.satisfied_by?(base.first.version) ? 0 : 1
  else
    all = index_for(dependency).search(dependency.name).size

    if all <= 1
      all - 1_000_000
    else
      search = search_for(dependency)
      search = prerelease_specified[dependency.name] ? search.count : search.count {|s| !s.version.prerelease? }
      search - all
    end
  end
end

# File bundler/resolver.rb, line 179
def base_requirements
  @base.base_requirements
end

# File bundler/resolver.rb, line 239
def gem_not_found_message(name, requirement, source, extra_message = "")
  specs = source.specs.search(name).sort_by {|s| [s.version, s.platform.to_s] }
  matching_part = name
  requirement_label = SharedHelpers.pretty_dependency(requirement)
  cache_message = begin
                      " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist?
                    rescue GemfileNotFound
                      nil
                    end
  specs_matching_requirement = specs.select {| spec| requirement.matches_spec?(spec) }

  if specs_matching_requirement.any?
    specs = specs_matching_requirement
    matching_part = requirement_label
    platforms = requirement.gem_platforms(@platforms)
    platform_label = platforms.size == 1 ? "platform '#{platforms.first}" : "platforms '#{platforms.join("', '")}"
    requirement_label = "#{requirement_label}' with #{platform_label}"
  end

  message = String.new("Could not find gem '#{requirement_label}'#{extra_message} in #{source}#{cache_message}.\n")

  if specs.any?
    message << "\nThe source contains the following gems matching '#{matching_part}':\n"
    message << specs.map {|s| "  * #{s.full_name}" }.join("\n")
  end

  message
end

# File bundler/resolver.rb, line 183
def prerelease_specified
  @gem_version_promoter.prerelease_specified
end

# File bundler/resolver.rb, line 187
def remove_from_candidates(spec)
  @base.delete(spec)

  @results_for.keys.each do |dep|
    next unless dep.name == spec.name

    @results_for[dep].reject {|s| s.name == spec.name && s.version == spec.version }
  end

  reset_spec_cache
end

# File bundler/resolver.rb, line 199
def reset_spec_cache
  @search_for = {}
  @gem_version_promoter.reset
end

# File bundler/resolver.rb, line 227
def verify_gemfile_dependencies_are_found!(requirements)
  requirements.map! do |requirement|
    name = requirement.name
    next requirement if name == "bundler"
    next if requirement.gem_platforms(@platforms).empty?
    next requirement unless search_for(requirement).empty?
    next unless requirement.current_platform?

    raise GemNotFound, gem_not_found_message(name, requirement, source_for(name))
  end.compact!
end

# File bundler/resolver.rb, line 268
def version_conflict_message(e)
  # only show essential conflicts, if possible
  conflicts = e.conflicts.dup

  if conflicts["bundler"]
    conflicts.replace("bundler" => conflicts["bundler"])
  else
    conflicts.delete_if do |_name, conflict|
      deps = conflict.requirement_trees.map(&:last).flatten(1)
      !Bundler::VersionRanges.empty?(*Bundler::VersionRanges.for_many(deps.map(&:requirement)))
    end
  end

  e = Molinillo::VersionConflict.new(conflicts, e.specification_provider) unless conflicts.empty?

  e.message_with_trees(
    :full_message_for_conflict => lambda do |name, conflict|
      trees = conflict.requirement_trees

      # called first, because we want to reduce the amount of work required to find maximal empty sets
      trees = trees.uniq {|t| t.flatten.map {|dep| [dep.name, dep.requirement] } }

      # bail out if tree size is too big for Array#combination to make any sense
      if trees.size <= 15
        maximal = 1.upto(trees.size).map do |size|
          trees.map(&:last).flatten(1).combination(size).to_a
        end.flatten(1).select do |deps|
          Bundler::VersionRanges.empty?(*Bundler::VersionRanges.for_many(deps.map(&:requirement)))
        end.min_by(&:size)

        trees.reject! {|t| !maximal.include?(t.last) } if maximal

        trees.sort_by! {|t| t.reverse.map(&:name) }
      end

      if trees.size > 1 || name == "bundler"
        o = if name.end_with?("\0")
          String.new("Bundler found conflicting requirements for the #{name} version:")
        else
          String.new("Bundler could not find compatible versions for gem \"#{name}\":")
        end
        o << %(\n)
        o << %(  In #{name_for_explicit_dependency_source}:\n)
        o << trees.map do |tree|
          t = "".dup
          depth = 2

          base_tree = tree.first
          base_tree_name = base_tree.name

          if base_tree_name.end_with?("\0")
            t = nil
          else
            tree.each do |req|
              t << "  " * depth << SharedHelpers.pretty_dependency(req)
              unless tree.last == req
                if spec = conflict.activated_by_name[req.name]
                  t << %( was resolved to #{spec.version}, which)
                end
                t << %( depends on)
              end
              t << %(\n)
              depth += 1
            end
          end
          t
        end.compact.join("\n")
      else
        o = String.new
      end

      if name == "bundler"
        o << %(\n  Current Bundler version:\n    bundler (#{Bundler::VERSION}))

        conflict_dependency = conflict.requirement
        conflict_requirement = conflict_dependency.requirement
        other_bundler_required = !conflict_requirement.satisfied_by?(Gem::Version.new(Bundler::VERSION))

        if other_bundler_required
          o << "\n\n"

          candidate_specs = source_for(:default_bundler).specs.search(conflict_dependency)
          if candidate_specs.any?
            target_version = candidate_specs.last.version
            new_command = [File.basename($PROGRAM_NAME), "_#{target_version}_", *ARGV].join(" ")
            o << "Your bundle requires a different version of Bundler than the one you're running.\n"
            o << "Install the necessary version with `gem install bundler:#{target_version}` and rerun bundler using `#{new_command}`\n"
          else
            o << "Your bundle requires a different version of Bundler than the one you're running, and that version could not be found.\n"
          end
        end
      elsif name.end_with?("\0")
        o << %(\n  Current #{name} version:\n    #{SharedHelpers.pretty_dependency(@metadata_requirements.find {|req| req.name == name })}\n\n)
      elsif !conflict.existing
        o << "\n"

        relevant_source = conflict.requirement.source || source_for(name)

        extra_message = if trees.first.size > 1
          ", which is required by gem '#{SharedHelpers.pretty_dependency(trees.first[-2])}',"
        else
          ""
        end

        o << gem_not_found_message(name, conflict.requirement, relevant_source, extra_message)
      end

      o
    end
  )
end