59 lines
1.9 KiB
C#
59 lines
1.9 KiB
C#
using System;
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namespace DramaLing.Api.Services;
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public static class CEFRLevelService
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{
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private static readonly string[] Levels = { "A1", "A2", "B1", "B2", "C1", "C2" };
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/// <summary>
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/// 取得 CEFR 等級的數字索引
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/// </summary>
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public static int GetLevelIndex(string level)
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{
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if (string.IsNullOrEmpty(level)) return 1; // 預設 A2
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return Array.IndexOf(Levels, level.ToUpper());
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}
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/// <summary>
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/// 判定詞彙對特定用戶是否為高價值
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/// 規則：比用戶程度高 1-2 級的詞彙為高價值
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/// </summary>
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public static bool IsHighValueForUser(string wordLevel, string userLevel)
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{
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var userIndex = GetLevelIndex(userLevel);
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var wordIndex = GetLevelIndex(wordLevel);
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// 無效等級處理
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if (userIndex == -1 || wordIndex == -1) return false;
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// 高價值 = 比用戶程度高 1-2 級
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return wordIndex >= userIndex + 1 && wordIndex <= userIndex + 2;
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}
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/// <summary>
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/// 取得用戶的目標學習等級範圍
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/// </summary>
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public static string GetTargetLevelRange(string userLevel)
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{
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var userIndex = GetLevelIndex(userLevel);
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if (userIndex == -1) return "B1-B2";
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var targetMin = Levels[Math.Min(userIndex + 1, Levels.Length - 1)];
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var targetMax = Levels[Math.Min(userIndex + 2, Levels.Length - 1)];
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return targetMin == targetMax ? targetMin : $"{targetMin}-{targetMax}";
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}
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/// <summary>
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/// 取得下一個等級
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/// </summary>
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public static string GetNextLevel(string currentLevel, int steps = 1)
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{
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var currentIndex = GetLevelIndex(currentLevel);
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if (currentIndex == -1) return "B1";
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var nextIndex = Math.Min(currentIndex + steps, Levels.Length - 1);
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return Levels[nextIndex];
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}
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} |