using System.Text;

namespace Colosseum.Combat.Simulation
{
    /// <summary>
    /// 배치 시뮬레이션 결과를 추출용 문자열로 변환합니다.
    /// </summary>
    public static class SimulationBatchReportUtility
    {
        /// <summary>
        /// Markdown 리포트를 생성합니다.
        /// </summary>
        public static string BuildMarkdown(SimulationBatchResult result)
        {
            if (result == null)
                return string.Empty;

            StringBuilder builder = new StringBuilder();
            builder.Append("# 허수아비 배치 시뮬레이션 결과");
            builder.AppendLine();
            builder.AppendLine();
            builder.Append("- Batch: ");
            builder.Append(result.BatchName);
            builder.AppendLine();
            builder.Append("- Generated Builds: ");
            builder.Append(result.GeneratedBuildCount);
            builder.AppendLine();
            builder.Append("- Truncated: ");
            builder.Append(result.Truncated ? "Yes" : "No");
            builder.AppendLine();
            builder.AppendLine();
            builder.AppendLine("| 순위 | 빌드 | DPS | 총 피해 | 총 마나 | 첫 사이클 |");
            builder.AppendLine("| --- | --- | ---: | ---: | ---: | ---: |");

            for (int i = 0; i < result.Entries.Count; i++)
            {
                SimulationBatchEntry entry = result.Entries[i];
                SimulationResult simulation = entry != null ? entry.Result : null;
                if (simulation == null)
                    continue;

                builder.Append("| ");
                builder.Append(i + 1);
                builder.Append(" | ");
                builder.Append(entry.BuildLabel);
                builder.Append(" | ");
                builder.Append(simulation.AverageDps.ToString("0.##"));
                builder.Append(" | ");
                builder.Append(simulation.TotalDamage.ToString("0.##"));
                builder.Append(" | ");
                builder.Append(simulation.TotalManaUsed.ToString("0.##"));
                builder.Append(" | ");
                builder.Append(simulation.FirstCycleEndTime >= 0f ? simulation.FirstCycleEndTime.ToString("0.##") + "s" : "미완료");
                builder.AppendLine(" |");
            }

            if (result.Warnings.Count > 0)
            {
                builder.AppendLine();
                builder.AppendLine("## 경고");
                builder.AppendLine();
                for (int i = 0; i < result.Warnings.Count; i++)
                {
                    builder.Append("- ");
                    builder.Append(result.Warnings[i]);
                    builder.AppendLine();
                }
            }

            return builder.ToString().TrimEnd();
        }

        /// <summary>
        /// CSV 리포트를 생성합니다.
        /// </summary>
        public static string BuildCsv(SimulationBatchResult result)
        {
            if (result == null)
                return string.Empty;

            StringBuilder builder = new StringBuilder();
            builder.AppendLine("Rank,BuildLabel,RuleName,RotationName,DurationSeconds,TotalDamage,AverageDps,TotalManaUsed,AverageManaPerSecond,FirstCycleEndTime,TopSkill,TopSkillDamage,Warnings");

            for (int i = 0; i < result.Entries.Count; i++)
            {
                SimulationBatchEntry entry = result.Entries[i];
                SimulationResult simulation = entry != null ? entry.Result : null;
                if (simulation == null)
                    continue;

                SimulationSkillBreakdown topSkill = simulation.SkillBreakdowns.Count > 0 ? simulation.SkillBreakdowns[0] : null;
                string warnings = string.Join(" / ", simulation.Warnings);

                builder.Append(i + 1);
                builder.Append(',');
                builder.Append(Escape(entry.BuildLabel));
                builder.Append(',');
                builder.Append(Escape(simulation.RuleName));
                builder.Append(',');
                builder.Append(Escape(simulation.RotationName));
                builder.Append(',');
                builder.Append(simulation.DurationSeconds.ToString("0.##"));
                builder.Append(',');
                builder.Append(simulation.TotalDamage.ToString("0.##"));
                builder.Append(',');
                builder.Append(simulation.AverageDps.ToString("0.##"));
                builder.Append(',');
                builder.Append(simulation.TotalManaUsed.ToString("0.##"));
                builder.Append(',');
                builder.Append(simulation.AverageManaPerSecond.ToString("0.##"));
                builder.Append(',');
                builder.Append(simulation.FirstCycleEndTime >= 0f ? simulation.FirstCycleEndTime.ToString("0.##") : string.Empty);
                builder.Append(',');
                builder.Append(Escape(topSkill != null ? topSkill.SkillName : string.Empty));
                builder.Append(',');
                builder.Append(topSkill != null ? topSkill.TotalDamage.ToString("0.##") : string.Empty);
                builder.Append(',');
                builder.Append(Escape(warnings));
                builder.AppendLine();
            }

            return builder.ToString().TrimEnd();
        }

        /// <summary>
        /// 기본 파일 이름을 생성합니다.
        /// </summary>
        public static string BuildDefaultFileName(SimulationBatchResult result, bool csv)
        {
            string batchName = result != null && !string.IsNullOrWhiteSpace(result.BatchName) ? result.BatchName : "BuildSimulationBatch";
            string extension = csv ? "csv" : "md";
            return $"{Sanitize(batchName)}.{extension}";
        }

        private static string Escape(string value)
        {
            if (string.IsNullOrEmpty(value))
                return string.Empty;

            bool needsQuotes = value.Contains(",") || value.Contains("\"") || value.Contains("\n") || value.Contains("\r");
            if (!needsQuotes)
                return value;

            return $"\"{value.Replace("\"", "\"\"")}\"";
        }

        private static string Sanitize(string value)
        {
            if (string.IsNullOrWhiteSpace(value))
                return "BuildSimulationBatch";

            string sanitized = value;
            char[] invalidChars = System.IO.Path.GetInvalidFileNameChars();
            for (int i = 0; i < invalidChars.Length; i++)
            {
                sanitized = sanitized.Replace(invalidChars[i], '_');
            }

            return sanitized.Replace(' ', '_');
        }
    }
}