module Danger
  # This plugin will show the coverage of the project. You can add warnings or failures
  # depending on the coverage percentage. It uses Xcode xccov to generate the coverage report.
  #
  # @example Require a minimum file coverage of 30%, a project coverage of 60% and show all modified files coverage
  #       xccov_summary.configure("Path/to/my/build_directory")
  #       xccov_summary.notify_if_coverage_is_less_than(minimum_coverage: 60)
  #       xccov_summary.show_coverage
  # @see  /danger-xccov_summary
  # @tags codecoverage

class DangerXccovSummary < Plugin

  # Required method to configure xccov. It's required to provide the path to the build directory.
  # @param    [String] build_directory path where the derivied data folder lives
  # @return  [void]
  def configure(project_build_directory)
     @build_directory = project_build_directory
     calculate_total_coverage
  end


  # Method to check if the coverage of the project is at least a minumum
  # @param options [Hash] a hash with the options
  # @option options [Float] :minimum_coverage the minimum code coverage required
  # @option options [Symbol] :notify_level the level of notification
  # @return [Array<String>]
  def notify_if_coverage_is_less_than(options)
    minimum_coverage = options[:minimum_coverage]
    notify_level = options[:notify_level] || :fail
    current_coverage = @current_coverage
    if current_coverage < minimum_coverage
      notify_message = "Total coverage is #{current_coverage} and is less than minimum: #{minimum_coverage}%"
      if notify_level == :fail
        fail notify_message
      else
        warn notify_message
      end
    end
  end

  # Show a header with the total coverage and coverage table
  # @return [Array<String>]
  def show_coverage
    line = "## Code coverage\n"
    line << total_coverage_markdown
    markdown line
  end

  private

  # String header with the total coverage of the project
  # @return [String]
  def total_coverage_markdown
    "### Total coverage: **`#{@current_coverage}%`**\n"
  end

  # Total coverage of the project

  def calculate_total_coverage
    file = `find "#{@build_directory}" -name "action.xccovreport"`.strip
    result = `xcrun xccov view #{file} --json`
    coverage_report = JSON.parse(result)
    @current_coverage = (coverage_report['lineCoverage'] * 100).round(2)
  end

end
end