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package org.egothor.stemmer;

import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

@Tag("unit")
@Tag("metadata")
@Tag("trie")
@Tag("validation")
@DisplayName("TrieMetadata")
class TrieMetadataTest {

    @Test
    @DisplayName("Text block roundtrip preserves all persisted fields")
    void textBlockRoundtripPreservesAllPersistedFields() {
        final TrieMetadata metadata = new TrieMetadata(5, WordTraversalDirection.FORWARD,
                new ReductionSettings(ReductionMode.MERGE_SUBTREES_WITH_EQUIVALENT_DOMINANT_GET_RESULTS, 80, 4),
                DiacriticProcessingMode.AS_IS, CaseProcessingMode.AS_IS);

        final String textBlock = metadata.toTextBlock();
        final TrieMetadata parsed = TrieMetadata.fromTextBlock(5, textBlock);

        assertAll(() -> assertEquals(metadata.traversalDirection(), parsed.traversalDirection()),
                () -> assertEquals(metadata.reductionSettings(), parsed.reductionSettings()),
                () -> assertEquals(metadata.diacriticProcessingMode(), parsed.diacriticProcessingMode()),
                () -> assertEquals(metadata.caseProcessingMode(), parsed.caseProcessingMode()),
                () -> assertTrue(textBlock.contains("rightToLeft=true")));
    }

    @Test
    @DisplayName("Text block parser rejects malformed input")
    void textBlockParserRejectsMalformedInput() {
        assertAll(
                () -> assertThrows(IllegalArgumentException.class,
                        () -> TrieMetadata.fromTextBlock(5, "unknown-header\nx=y\n")),
                () -> assertThrows(IllegalArgumentException.class,
                        () -> TrieMetadata.fromTextBlock(5, "radixor.metadata.v1\nmissingDelimiter\n")),
                () -> assertThrows(IllegalArgumentException.class,
                        () -> TrieMetadata.fromTextBlock(5, "radixor.metadata.v1\ntraversalDirection=FORWARD\n")));
    }
}
