package p8;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import net.jqwik.api.*;
import net.jqwik.api.lifecycle.AfterContainer;
import p8.GroundTruth;

public class TestCaseGenerator {

    static class TestCase {
        Map<String, Object> Inputs;
        Object Expected;
        TestCase(Map<String, Object> inputs, Object expected) {
            this.Inputs = inputs;
            this.Expected = expected;
        }
    }

    static List<TestCase> generatedCases = new ArrayList<>();
    static AtomicInteger caseCount = new AtomicInteger(0);
    static final int MAX_CASES = 500;

    @Property(tries = 10000)
    void generateTestCases(@ForAll("textWithJson") String text) {
        if (caseCount.get() >= MAX_CASES) {
            return;
        }

        String result;
        try {
            result = GroundTruth.extractFirstJsonObject(text);
        } catch (Exception e) {
            return;
        }

        Map<String, Object> inputs = new LinkedHashMap<>();
        inputs.put("text", text);
        generatedCases.add(new TestCase(inputs, result));
        caseCount.incrementAndGet();
    }

    @Example
    void example1() {
        generateTestCases("{\"key\": \"value\"}");
    }

    @Example
    void example2() {
        generateTestCases("No JSON here");
    }

    @Example
    void example3() {
        generateTestCases("{ \"nested\": { \"inner\": \"value\" } }");
    }

    @Example
    void example4() {
        generateTestCases("{\"key\": \"value\"} extra text");
    }

    @Provide
    Arbitrary<String> textWithJson() {
        return Arbitraries.strings()
            .withChars("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789{}:,\" ")
            .map(s -> {
                // Randomly insert JSON-like structures
                if (Arbitraries.integers().between(0, 1).sample() == 0) {
                    return s + "{\"key\": \"" + s + "\"}";
                } else {
                    return s;
                }
            });
    }

    @AfterContainer
    static void saveTestCases() throws IOException {
        if (generatedCases.isEmpty()) {
            return;
        }
        String dirPath = "src/test/java/test_cases";
        File dir = new File(dirPath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        String filePath = dirPath + "/test_cases.json";
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        try (Writer writer = new FileWriter(filePath)) {
            gson.toJson(generatedCases, writer);
        }
        System.out.println("✅ Saved " + generatedCases.size() + " test cases to " + filePath);
    }
}