PullRequestBody.cs

using System;
using System.Text;
using Common.TableModels;

namespace OpenPrFunction
{
    public static class PullRequestBody
    {
        /*
         * Convert the ImageStat[] into a markdown PR body
         */
        public static string Generate(ImageStat[] imageStats, Settings settings = null)
        {
            var prBody = BasicPr(imageStats, settings);

            if (settings?.PrBody != null)
            {
                prBody = settings?.PrBody;
            }

            prBody = ReplacePrMagicTags(imageStats, prBody);
            return prBody;
        }

        private static string BasicPr(ImageStat[] imageStats, Settings settings = null)
        {
            if (imageStats == null || imageStats.Length == 0)
            {
                return "Beep boop. Optimizing your images is my life. https://imgbot.net/ for more information."
                    + Environment.NewLine + Environment.NewLine;
            }

            var sb = new StringBuilder();
            sb.AppendLine("## Beep boop. Your images are optimized!");
            sb.AppendLine();
            sb.AppendLine("{optimization_ratio}");
            sb.AppendLine();
            sb.AppendLine("{optimization_details}");

            sb.Append("[📝 docs](https://imgbot.net/docs) | ");
            sb.Append("[:octocat: repo](https://github.com/imgbot/ImgBot) | ");
            sb.Append("[🙋🏾 issues](https://github.com/imgbot/ImgBot/issues) | ");
            sb.Append("[🏪 marketplace](https://github.com/marketplace/imgbot)");
            sb.AppendLine();
            sb.AppendLine();
            sb.Append("<i>");
            sb.Append("~Imgbot - Part of [Optimole](https://optimole.com/) family");
            sb.Append("</i>");
            sb.AppendLine();
            return sb.ToString();
        }

        private static string ReplacePrMagicTags(ImageStat[] imageStats, string prBody)
        {
            if (imageStats == null || imageStats.Length == 0)
            {
                prBody = prBody.Replace("{optimization_ratio}", "Your image file size has been reduced!");
                prBody = prBody.Replace("{optimization_details}", string.Empty);
                return prBody;
            }

            if (prBody.Contains("{optimization_ratio}"))
            {
               var replace = "Your image file size has been reduced ";
               if (Math.Round(imageStats[0].Percent) >= 5)
               {
                   replace += $"by **{imageStats[0].Percent:N0}%** ";
               }

               replace += "🎉";
               prBody = prBody.Replace("{optimization_ratio}", replace);
            }

            if (prBody.Contains("{optimization_details}"))
            {
                var sb = new StringBuilder();
                sb.AppendLine("<details>");

                sb.AppendLine("<summary>");
                sb.AppendLine("Details");
                sb.AppendLine("</summary>");
                sb.AppendLine();

                sb.AppendLine("| File | Before | After | Percent reduction |");
                sb.AppendLine("|:--|:--|:--|:--|");

                if (imageStats.Length == 1)
                {
                    sb.AppendLine($"| {imageStats[0].Name} | {imageStats[0].Before} | {imageStats[0].After} | {imageStats[0].Percent:N2}% |");
                }
                else
                {
                    // the zeroth item is the total; we print it at the bottom of the table
                    for (var i = 1; i < imageStats.Length; i++)
                    {
                        sb.AppendLine($"| {imageStats[i].Name} | {imageStats[i].Before} | {imageStats[i].After} | {imageStats[i].Percent:N2}% |");
                    }

                    sb.AppendLine("| | | | |");
                    sb.AppendLine($"| **Total :** | **{imageStats[0].Before}** | **{imageStats[0].After}** | **{imageStats[0].Percent:N2}%** |");
                }

                sb.AppendLine("</details>");
                sb.AppendLine();
                sb.AppendLine("---");

                prBody = prBody.Replace("{optimization_details}", sb.ToString());
            }

            return prBody;
        }
    }
}