class Gitlab::GraphCommit

# File lib/gitlab/graph_commit.rb, line 113
def self.find_free_space(time_range)
  reserved = []
  for day in time_range
      reserved += @_reserved[day]
  end
  space = 1
  while reserved.include? space do
    space += 1
  end
  space
end

# File lib/gitlab/graph_commit.rb, line 33
def self.index_commits(commits)
  days, heads = [], []
  map = {}

  commits.reverse.each_with_index do |c,i|
    c.time = i
    days[i] = c.committed_date
    map[c.id] = c
    heads += c.refs unless c.refs.nil?
  end

  heads.select!{|h| h.is_a? Grit::Head or h.is_a? Grit::Remote}
  # sort heads so the master is top and current branches are closer
  heads.sort! do |a,b|
    if a.name == "master"
      -1
    elsif b.name == "master"
      1
    else
      b.commit.committed_date <=> a.commit.committed_date
    end
  end

  @_reserved = {}
  days.each_index do |i|
    @_reserved[i] = []
  end

  heads.each do |h|
    if map.include? h.commit.id then
      place_chain(map[h.commit.id], map)
    end
  end
  days
end

# File lib/gitlab/graph_commit.rb, line 107
def self.mark_reserved(time_range, space)
  for day in time_range
    @_reserved[day].push(space)
  end
end

# File lib/gitlab/graph_commit.rb, line 148
def initialize(commit)
  @_commit = commit
  @time = -1
  @space = 0
end

# File lib/gitlab/graph_commit.rb, line 73
def self.place_chain(commit, map, parent_time = nil)
  leaves = take_left_leaves(commit, map)
  if leaves.empty? then
    return
  end
  space = find_free_space(leaves.last.time..leaves.first.time)
  leaves.each{|l| l.space = space}
  # and mark it as reserved
  min_time = leaves.last.time
  parents = leaves.last.parents.collect
  parents.each do |p|
    if map.include? p.id then
      parent = map[p.id]
      if parent.time < min_time then
        min_time = parent.time
      end
    end
  end
  if parent_time.nil? then
    max_time = leaves.first.time
  else
    max_time = parent_time - 1
  end
  mark_reserved(min_time..max_time, space)
  # Visit branching chains
  leaves.each do |l|
    parents = l.parents.collect
      .select{|p| map.include? p.id and map[p.id].space == 0}
    for p in parents
      place_chain(map[p.id], map, l.time)
    end
  end
end

# File lib/gitlab/graph_commit.rb, line 132
def self.take_left_leaves(commit, map)
  leaves = []
  leaves.push(commit)  if commit.space == 0
  while true
    parent = commit.parents.collect
      .select{|p| map.include? p.id and map[p.id].space == 0}
    if parent.count == 0 then
      return leaves
    else
      commit = map[parent.first.id]
      leaves.push(commit)
    end
  end
end

# File lib/gitlab/graph_commit.rb, line 10
def self.to_graph(project)
  @repo = project.repo
  commits = Grit::Commit.find_all(@repo, nil, {max_count: 650})

  ref_cache = {}

  commits.map! {|c| GraphCommit.new(Commit.new(c))}
  commits.each { |commit| commit.add_refs(ref_cache, @repo) }

  days = GraphCommit.index_commits(commits)
  @days_json = days.compact.collect{|d| [d.day, d.strftime("%b")] }.to_json
  @commits_json = commits.map(&:to_graph_hash).to_json

  return @days_json, @commits_json
end

# File lib/gitlab/graph_commit.rb, line 174
def add_refs(ref_cache, repo)
  if ref_cache.empty?
    repo.refs.each do |ref|
      ref_cache[ref.commit.id] ||= []
      ref_cache[ref.commit.id] << ref
    end
  end
  @refs = ref_cache[@_commit.id] if ref_cache.include?(@_commit.id)
  @refs ||= []
end

# File lib/gitlab/graph_commit.rb, line 154
def method_missing(m, *args, &block)
  @_commit.send(m, *args, &block)
end

# File lib/gitlab/graph_commit.rb, line 158
def to_graph_hash
  h = {}
  h[:parents] = self.parents.collect do |p|
    [p.id,0,0]
  end
  h[:author]  = Gitlab::Encode.utf8(author.name)
  h[:time]    = time
  h[:space]   = space
  h[:refs]    = refs.collect{|r|r.name}.join(" ") unless refs.nil?
  h[:id]      = sha
  h[:date]    = date
  h[:message] = escape_once(Gitlab::Encode.utf8(message))
  h[:login]   = author.email
  h
end