Improve find characters query to only show characters with the same pronunciation

src/main/kotlin/com/marvinelsen/willow/domain/SqliteDictionary.kt

@@ -78,10 +78,11 @@ class SqliteDictionary(private val connection: Connection) : Dictionary {
     }
 
     private val findCharacters = """
-            WITH cte(id, character) AS (VALUES ?)
+            WITH cte(id, character, syllable) AS (VALUES ?)
             SELECT traditional, simplified, pinyin_with_tone_marks, pinyin_with_tone_numbers, zhuyin, cedict_definitions, cross_straits_definitions, moe_definitions
             FROM entry INNER JOIN cte
             ON cte.character = entry.traditional OR cte.character = entry.simplified
+            WHERE cte.syllable = entry.pinyin_with_tone_numbers
             ORDER BY cte.id
     """.trimIndent()
 
@@ -105,13 +106,24 @@ class SqliteDictionary(private val connection: Connection) : Dictionary {
     }
 
     override fun findCharacters(entry: DictionaryEntry): List<DictionaryEntry> {
-        val characterList = entry.traditional
+        val pinyinSyllablesWithToneNumbers = entry.pinyinWithToneNumbers
+            .lowercase()
+            .split(" ")
+            .filter { it.isNotBlank() }
+
+        val characters = entry.traditional
             .split("")
             .filter { it.isNotBlank() }
-            .mapIndexed { index, s -> "($index, '$s')" }
+            .filter { it != "，" }
+            .filter { it != "·" }
+
+        val charactersWithSyllables = characters.zip(pinyinSyllablesWithToneNumbers)
+
+        val queryInput = charactersWithSyllables
+            .mapIndexed { index, s -> "($index, '${s.first}', '${s.second}')" }
             .joinToString(",")
 
-        val query = findCharacters.replace("?", characterList)
+        val query = findCharacters.replace("?", queryInput)
 
         val resultSet: ResultSet = connection.createStatement().executeQuery(query)