module StacksHelper
  COMMIT_TITLE_LENGTH = 79

  def redeploy_button(commit)
    url = new_stack_deploy_path(@stack, sha: commit.sha)
    classes = %W(btn btn--primary deploy-action #{commit.state})

    unless commit.stack.deployable?
      classes.push(ignore_lock? ? 'btn--warning' : 'btn--disabled')
    end

    caption = 'Redeploy'
    caption = 'Locked' if commit.stack.locked? && !ignore_lock?
    caption = 'Deploy in progress...' if commit.stack.deploying?

    link_to(caption, url, class: classes)
  end

  def ignore_lock?
    params[:force].present?
  end

  def deploy_button(commit)
    url = new_stack_deploy_path(@stack, sha: commit.sha)
    classes = %W(btn btn--primary deploy-action #{commit.state})
    if deploy_button_disabled?(commit)
      classes.push(params[:force].present? ? 'btn--warning' : 'btn--disabled')
    end

    link_to(deploy_button_caption(commit), url, class: classes)
  end

  def github_change_url(commit)
    commit.pull_request_url || github_commit_url(commit)
  end

  def render_commit_message(commit)
    message = commit.pull_request_title || commit.message
    content_tag(:span, message.truncate(COMMIT_TITLE_LENGTH), class: 'event-message')
  end

  def render_commit_message_with_link(commit)
    link_to(render_commit_message(commit), github_change_url(commit), target: '_blank')
  end

  def render_commit_id_link(commit)
    if commit.pull_request?
      pull_request_link(commit) + " (#{render_raw_commit_id_link(commit)})".html_safe
    else
      render_raw_commit_id_link(commit)
    end
  end

  def pull_request_link(commit)
    link_to("##{commit.pull_request_id}", commit.pull_request_url, target: '_blank', class: 'number')
  end

  def render_raw_commit_id_link(commit)
    link_to(commit.short_sha, github_commit_url(commit), target: '_blank', class: 'number')
  end

  private

  def deploy_button_disabled?(commit)
    !commit.deployable? || !commit.stack.deployable?
  end

  def deploy_button_caption(commit)
    case
    when commit.stack.locked? && !ignore_lock? then 'Locked'
    when commit.deployable? then commit.stack.deploying? ? 'Deploy in progress...' : 'Deploy'
    when commit.pending? then 'CI Pending...'
    when commit.failure? then 'CI Failure'
    when commit.error? then 'CI Error'
    else 'Not Run'
    end
  end

  def render_status(commit)
    statuses = commit.visible_statuses
    if statuses.size == 1
      render statuses.first
    else
      render StatusGroup.new(commit)
    end
  end
end