<?php
/**
 * Database Connection Test
 * Tests basic database connectivity and query functionality
 */

// Must be set before Database.php is required so getDatabasePath() picks it up.
putenv('DB_ENV=test');

require_once __DIR__ . '/../../src/Database.php';

echo "Database Connection Test\n";
echo "========================\n\n";

try {
    // Test 1: Database connection
    echo "Test 1: Database Connection\n";
    $db = Database::getInstance();
    echo "✓ PASS: Database connection successful\n\n";

    // Test 2: Count published theses
    echo "Test 2: Count Published Theses\n";
    $count = $db->countPublishedTheses();
    if ($count >= 0) {
        echo "✓ PASS: Found {$count} published theses\n\n";
    } else {
        throw new Exception("Invalid count returned");
    }

    // Test 3: Get published theses
    echo "Test 3: Get Published Theses\n";
    $theses = $db->getPublishedTheses(5, 0);
    if (is_array($theses)) {
        echo "✓ PASS: Retrieved " . count($theses) . " theses\n\n";
    } else {
        throw new Exception("Invalid theses array returned");
    }

    // Test 4: Get single thesis (if any exist)
    if (count($theses) > 0) {
        echo "Test 4: Get Single Thesis\n";
        $first = $theses[0];
        $thesis = $db->getThesisById($first['id']);
        
        if ($thesis && isset($thesis['id'])) {
            echo "✓ PASS: Successfully retrieved thesis #{$first['id']}\n";
            echo "  Title: " . $thesis['title'] . "\n";
            echo "  Author(s): " . ($thesis['authors'] ?? 'N/A') . "\n";
            echo "  Year: " . $thesis['year'] . "\n\n";
        } else {
            throw new Exception("Failed to retrieve thesis by ID");
        }
    }

    // Test 5: findOrCreateTag round-trip
    echo "Test 5: findOrCreateTag round-trip\n";
    $testTag = '__test_tag_' . bin2hex(random_bytes(4));
    $id1 = $db->findOrCreateTag($testTag);
    $id2 = $db->findOrCreateTag($testTag); // should return same id
    if ($id1 && $id1 === $id2) {
        echo "✓ PASS: findOrCreateTag returned consistent id=$id1 for '$testTag'\n\n";
        // Clean up
        $db->deleteTag($id1);
    } else {
        throw new Exception("findOrCreateTag round-trip failed: id1=$id1, id2=$id2");
    }

    // Test 6: getUsedTags returns array with 'name' column
    echo "Test 6: getUsedTags returns name column\n";
    $tags = $db->getUsedTags();
    if (is_array($tags) && (empty($tags) || isset($tags[0]['name']))) {
        echo "✓ PASS: getUsedTags returned " . count($tags) . " tags with 'name' column\n\n";
    } else {
        throw new Exception("getUsedTags did not return expected structure: " . json_encode($tags[0] ?? []));
    }

    echo "✅ All database tests passed!\n";
    return true;

} catch (Exception $e) {
    echo "❌ FAIL: " . $e->getMessage() . "\n";
    return false;
}