<?php
require __DIR__ . '/../session.php';
require __DIR__ . '/../db.php';
start_app_session();

header('Content-Type: application/json');

$pdo = getDbConnection();
enforce_session_version($pdo);

if (!isset($_SESSION['user_id'])) {
    http_response_code(401);
    echo json_encode(['error' => 'Not authenticated']);
    exit;
}

function fetchOwnedCritter(PDO $pdo, int $userId, int $critterId): array|false
{
    $stmt = $pdo->prepare('
        SELECT c.id AS id, c.isFavorite AS isFavorite, c.isArchived AS isArchived,
               c.adjective_id AS adjective_id, c.noun_id AS noun_id, c.verb_id AS verb_id, c.location_id AS location_id,
               a.value AS adjective, n.value AS noun, v.value AS verb, l.value AS location, c.image AS image
        FROM critters c
        JOIN adjectives a ON a.id = c.adjective_id
        JOIN nouns n ON n.id = c.noun_id
        JOIN verbs v ON v.id = c.verb_id
        JOIN locations l ON l.id = c.location_id
        WHERE c.id = :id AND c.author_id = :author_id
    ');
    $stmt->execute(['id' => $critterId, 'author_id' => $userId]);
    return $stmt->fetch(PDO::FETCH_ASSOC);
}

$method = $_SERVER['REQUEST_METHOD'];
$critterId = $method === 'POST'
    ? filter_input(INPUT_POST, 'id', FILTER_VALIDATE_INT)
    : filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT);

if (!$critterId) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid critter id']);
    exit;
}

$critter = fetchOwnedCritter($pdo, (int) $_SESSION['user_id'], $critterId);

if (!$critter) {
    http_response_code(404);
    echo json_encode(['error' => 'Critter not found']);
    exit;
}

if ($method === 'POST' && !csrf_verify($_POST['csrf_token'] ?? null)) {
    http_response_code(403);
    echo json_encode(['error' => 'Invalid CSRF token']);
    exit;
}

if ($method === 'POST') {
    $action = $_POST['action'] ?? '';

    if ($action === 'toggle_favorite') {
        $newValue = $critter['isFavorite'] ? 0 : 1;
        $stmt = $pdo->prepare('UPDATE critters SET isFavorite = :value WHERE id = :id');
        $stmt->execute(['value' => $newValue, 'id' => $critterId]);
        $critter['isFavorite'] = $newValue;
    } elseif ($action === 'toggle_archived') {
        $newValue = $critter['isArchived'] ? 0 : 1;
        $stmt = $pdo->prepare('UPDATE critters SET isArchived = :value WHERE id = :id');
        $stmt->execute(['value' => $newValue, 'id' => $critterId]);
        $critter['isArchived'] = $newValue;
    }
}

$flourishes = [
    'Always up for a new adventure!',
    'This one has a real personality.',
    'Ready to make new friends.',
    "There's never a dull moment with this critter.",
    'One of a kind, through and through.',
    'A firm favorite in the collection.',
    'Full of charm and curiosity.',
];
$flourish = $flourishes[array_rand($flourishes)];
$description = 'A ' . $critter['adjective'] . ' ' . $critter['noun'] . ' who ' . $critter['verb'] . ' ' . $critter['location'] . '. ' . $flourish;
$prompt = "A {$critter['adjective']} {$critter['noun']} {$critter['verb']} {$critter['location']} in a high quality 3d animation art style. The image should be vibrant and colorful, capturing the essence of the action and setting.";

$rarityTiers = [
    ['label' => 'Common', 'classes' => 'bg-pink-100 text-pink-700'],
    ['label' => 'Rare', 'classes' => 'bg-blue-100 text-blue-700'],
    ['label' => 'Legendary', 'classes' => 'bg-amber-100 text-amber-700'],
];
$rarityRoll = $critter['id'] % 10;
if ($rarityRoll >= 9) {
    $rarity = $rarityTiers[2];
} elseif ($rarityRoll >= 6) {
    $rarity = $rarityTiers[1];
} else {
    $rarity = $rarityTiers[0];
}

$resolution = null;
$fileSize = null;
$createdAt = null;

if (!empty($critter['image'])) {
    $imagePath = __DIR__ . '/../critter-images/' . $critter['image'];
    if (is_file($imagePath)) {
        $dimensions = @getimagesize($imagePath);
        if ($dimensions) {
            $resolution = $dimensions[0] . ' × ' . $dimensions[1];
        }
        $bytes = @filesize($imagePath);
        if ($bytes !== false) {
            $fileSize = round($bytes / 1024) . ' KB';
        }
        $mtime = @filemtime($imagePath);
        if ($mtime !== false) {
            $createdAt = date('j M Y, H:i', $mtime);
        }
    }
}

echo json_encode([
    'id' => (int) $critter['id'],
    'title' => ucwords($critter['adjective'] . ' ' . $critter['noun']),
    'adjective' => ucfirst($critter['adjective']),
    'noun' => ucfirst($critter['noun']),
    'verb' => ucfirst($critter['verb']),
    'location' => ucfirst($critter['location']),
    'isFavorite' => (bool) $critter['isFavorite'],
    'isArchived' => (bool) $critter['isArchived'],
    'rarity' => $rarity,
    'description' => $description,
    'prompt' => $prompt,
    'createdAt' => $createdAt,
    'resolution' => $resolution,
    'fileSize' => $fileSize,
    'imageUrl' => $critter['image'] ? 'critter-images/' . $critter['image'] : null,
    'shareUrl' => 'single-critter.php?id=' . $critter['id'],
    'createSimilarUrl' => 'create-critter.php?adjective_id=' . $critter['adjective_id']
        . '&noun_id=' . $critter['noun_id']
        . '&verb_id=' . $critter['verb_id']
        . '&location_id=' . $critter['location_id'],
]);