package p12;

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 p12.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("milliseconds") long milliseconds) {
        if (caseCount.get() >= MAX_CASES) {
            return;
        }

        String result;
        try {
            result = GroundTruth.formatDuration(milliseconds);
        } catch (Exception e) {
            return;
        }

        boolean isMsBranch = milliseconds < 1000;
        boolean isSBranch = milliseconds >= 1000 && milliseconds < 60 * 1000;
        boolean isMinBranch = milliseconds >= 60 * 1000 && milliseconds < 60 * 60 * 1000;
        boolean isHBranch = milliseconds >= 60 * 60 * 1000;
        if (!isMsBranch && !isSBranch && !isMinBranch && !isHBranch) {
            return;
        }

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

    @Example
    void example1() {
        generateTestCases(500L);
    }

    @Example
    void example2() {
        generateTestCases(1500L);
    }

    @Example
    void example3() {
        generateTestCases(35000L);
    }

    @Example
    void example4() {
        generateTestCases(7200000L);
    }

    @Provide
    Arbitrary<Long> milliseconds() {
        return Arbitraries.longs().between(0, Long.MAX_VALUE);
    }

    @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);
    }
}