// LeetCode 2785: Sort Vowels In A String
// 難度: Medium
// 日期: 2025-09-11

using System;
using System.Collections.Generic;
using System.Linq;

public class Solution {
    public string SortVowels(string s) {
        // to char[]
        char[] sArray = s.ToCharArray();

        // get all vowels
        string vowels = "aeiouAEIOU";
        List<int> vowelPositions = new List<int>();
        List<char> vowelChars = new List<char>();
        
        for(int i = 0; i < sArray.Length; i++){
            if(vowels.Contains(sArray[i])){
                vowelPositions.Add(i);
                vowelChars.Add(sArray[i]);
            }
        }

        // sort all vowels
        vowelChars.Sort();

        // insert vowels
        for(var i = 0; i < vowelPositions.Count; i++){
            sArray[vowelPositions[i]] = vowelChars[i];
        }

        return new string(sArray);
    }
}

// 測試程式
public class Program {
    public static void Main() {
        Solution sol = new Solution();
        
        // TODO: 加入測試案例
        TestCase1(sol);
        TestCase2(sol);
        TestCase3(sol);
        TestCase4(sol);
        TestCase5(sol);
        TestCase6(sol);
        TestCase7(sol);
    }
    
    // 基本範例 - LeetCode官方例子
    static void TestCase1(Solution sol) {
        var s = "lEetcOde";
        var result = sol.SortVowels(s);
        var expected = "lEOtcede";
        Console.WriteLine($"Test 1: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 只有子音 - 沒有母音的情況
    static void TestCase2(Solution sol) {
        var s = "lYmpH";
        var result = sol.SortVowels(s);
        var expected = "lYmpH";
        Console.WriteLine($"Test 2: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 只有母音 - 測試排序功能
    static void TestCase3(Solution sol) {
        var s = "aEiOu";
        var result = sol.SortVowels(s);
        var expected = "EOaiu";
        Console.WriteLine($"Test 3: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 混合大小寫母音
    static void TestCase4(Solution sol) {
        var s = "TestcasE";
        var result = sol.SortVowels(s);
        var expected = "TEstcase";
        Console.WriteLine($"Test 4: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 單一字元 - 邊界情況
    static void TestCase5(Solution sol) {
        var s = "a";
        var result = sol.SortVowels(s);
        var expected = "a";
        Console.WriteLine($"Test 5: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 重複母音
    static void TestCase6(Solution sol) {
        var s = "Aa";
        var result = sol.SortVowels(s);
        var expected = "Aa";
        Console.WriteLine($"Test 6: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
    
    // 較長的字串測試
    static void TestCase7(Solution sol) {
        var s = "RaInBoW";
        var result = sol.SortVowels(s);
        var expected = "RIanBoW";
        Console.WriteLine($"Test 7: Input: \"{s}\", Result: \"{result}\", Expected: \"{expected}\", Pass: {result == expected}");
    }
}