#!/usr/bin/env ruby
# frozen_string_literal: true

require 'bundler/inline'
require 'optparse'
require 'fileutils'

gemfile do
  source 'https://rubygems.org'

  gem 'gitlab', '~> 5.1'
  gem 'test_file_finder', '~> 0.3'
  # loaded from standard library by gitlab and will stop working on ruby 3.4
  gem 'base64'
  gem 'csv'
end

require_relative '../lib/tooling/predictive_tests/metrics_exporter'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{$PROGRAM_NAME} [options]"

  opts.on('--export-backend-metrics', 'Export predictive test metrics for rspec') do
    options[:export_backend_metrics] = true
  end

  opts.on('--export-frontend-metrics', 'Export predictive test metrics for frontend') do
    options[:export_frontend_metrics] = true
  end

  opts.on('--failed-backend-tests-file [string]', String, 'File with list of failed rspec tests') do |value|
    options[:failed_backend_tests_file] = value
  end

  opts.on('--failed-frontend-tests-file [string]', String, 'File with list of failed jest tests') do |value|
    options[:failed_frontend_tests_file] = value
  end

  opts.on('--knapsack-report-file [string]', String, 'Knapsack report JSON file with specs runtimes') do |value|
    options[:knapsack_report_file] = value
  end

  opts.on('--output-dir [string]', String, 'Output directory for generated metrics files') do |value|
    options[:output_dir] = value
  end

  opts.on('--debug', 'Enable debug logging') do
    options[:debug] = true
  end

  opts.on('-h', '--help', 'Show this help message') do
    puts opts
    exit
  end
end.parse!

results = []
log_level = options[:debug] ? :debug : :info

def empty_arg?(arg)
  arg.nil? || arg.empty?
end

export_backend = options[:export_backend_metrics]
failed_backend_tests_file = options[:failed_backend_tests_file]
export_frontend = options[:export_frontend_metrics]
failed_frontend_tests_file = options[:failed_frontend_tests_file]
knapsack_report_file = options[:knapsack_report_file]

# Validate at least one option is provided
if [export_backend, export_frontend].all?(&:nil?)
  puts <<~MSG
    Error: Please specify at least one of these flags:
      1. --export-backend-metrics
      2. --export-frontend-metrics
  MSG

  exit 1
end

if export_backend
  if empty_arg?(failed_backend_tests_file)
    puts "[predictive tests] Error: Missing argument: --failed-backend-tests-file"
    puts "[predictive tests] skipping backend metrics export"
    results << false
  else
    # scripts that fetch failed tests do not create empty file when no failures were detected
    FileUtils.touch(failed_backend_tests_file) unless File.exist?(failed_backend_tests_file)
    results << Tooling::PredictiveTests::MetricsExporter.new(
      test_type: :backend,
      output_dir: options[:output_dir],
      all_failed_tests_file: failed_backend_tests_file,
      test_runtime_report_file: knapsack_report_file,
      log_level: log_level
    ).execute
  end
end

if export_frontend
  if empty_arg?(failed_frontend_tests_file)
    puts "[predictive tests] Error: Missing argument: --failed-frontend-tests-file"
    puts "[predictive tests] skipping frontend metrics export"
    results << false
  else
    # scripts that fetch failed tests do not create empty file when no failures were detected
    FileUtils.touch(failed_frontend_tests_file) unless File.exist?(failed_frontend_tests_file)
    results << Tooling::PredictiveTests::MetricsExporter.new(
      test_type: :frontend,
      output_dir: options[:output_dir],
      all_failed_tests_file: options[:failed_frontend_tests_file],
      log_level: log_level
    ).execute
  end
end

results.include?(false) ? exit(1) : exit(0)