<?php
declare(strict_types=1);

require_once __DIR__ . '/db/config.php';

const RECLINER_PATTERNS = ['continuous', 'pulse'];

function project_meta(): array
{
    $projectName = $_SERVER['PROJECT_NAME'] ?? getenv('PROJECT_NAME') ?: 'Recliner Haptics Studio';
    $projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? getenv('PROJECT_DESCRIPTION') ?: 'Browser-based recliner simulator with gamepad vibration controls, saved presets, and a live recline angle visualizer.';
    $projectImageUrl = $_SERVER['PROJECT_IMAGE_URL'] ?? getenv('PROJECT_IMAGE_URL') ?: '';

    return [
        'name' => (string) $projectName,
        'description' => (string) $projectDescription,
        'image' => (string) $projectImageUrl,
    ];
}

function ensure_recliner_schema(): void
{
    db()->exec(
        "CREATE TABLE IF NOT EXISTS recliner_presets (
            id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
            name VARCHAR(120) NOT NULL,
            angle_deg TINYINT UNSIGNED NOT NULL,
            intensity_pct TINYINT UNSIGNED NOT NULL,
            pattern_mode VARCHAR(20) NOT NULL,
            duration_ms SMALLINT UNSIGNED NOT NULL,
            notes VARCHAR(255) DEFAULT NULL,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
    );
}

function default_preset(): array
{
    return [
        'name' => 'Demo Lounge',
        'angle_deg' => 112,
        'intensity_pct' => 44,
        'pattern_mode' => 'continuous',
        'duration_ms' => 1400,
        'notes' => 'Balanced demo profile for a calm showroom preview.',
    ];
}

function validate_preset_input(array $input): array
{
    $errors = [];

    $name = trim((string) ($input['name'] ?? ''));
    if ($name === '' || strlen($name) < 2 || strlen($name) > 120) {
        $errors['name'] = 'Preset name must be between 2 and 120 characters.';
    }

    $angle = filter_var($input['angle_deg'] ?? null, FILTER_VALIDATE_INT, [
        'options' => ['min_range' => 0, 'max_range' => 160],
    ]);
    if ($angle === false) {
        $errors['angle_deg'] = 'Angle must be between 0° and 160°.';
    }

    $intensity = filter_var($input['intensity_pct'] ?? null, FILTER_VALIDATE_INT, [
        'options' => ['min_range' => 0, 'max_range' => 100],
    ]);
    if ($intensity === false) {
        $errors['intensity_pct'] = 'Intensity must be between 0% and 100%.';
    }

    $duration = filter_var($input['duration_ms'] ?? null, FILTER_VALIDATE_INT, [
        'options' => ['min_range' => 100, 'max_range' => 5000],
    ]);
    if ($duration === false) {
        $errors['duration_ms'] = 'Duration must be between 100 ms and 5000 ms.';
    }

    $pattern = (string) ($input['pattern_mode'] ?? 'continuous');
    if (!in_array($pattern, RECLINER_PATTERNS, true)) {
        $errors['pattern_mode'] = 'Choose a supported vibration pattern.';
    }

    $notes = trim((string) ($input['notes'] ?? ''));
    if (strlen($notes) > 255) {
        $errors['notes'] = 'Notes must stay under 255 characters.';
    }

    return [
        'errors' => $errors,
        'data' => [
            'name' => $name,
            'angle_deg' => $angle === false ? 0 : (int) $angle,
            'intensity_pct' => $intensity === false ? 0 : (int) $intensity,
            'pattern_mode' => $pattern,
            'duration_ms' => $duration === false ? 1000 : (int) $duration,
            'notes' => $notes,
        ],
    ];
}

function save_preset(array $data): int
{
    $stmt = db()->prepare(
        'INSERT INTO recliner_presets (name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes)
         VALUES (:name, :angle_deg, :intensity_pct, :pattern_mode, :duration_ms, :notes)'
    );

    $stmt->bindValue(':name', $data['name'], PDO::PARAM_STR);
    $stmt->bindValue(':angle_deg', $data['angle_deg'], PDO::PARAM_INT);
    $stmt->bindValue(':intensity_pct', $data['intensity_pct'], PDO::PARAM_INT);
    $stmt->bindValue(':pattern_mode', $data['pattern_mode'], PDO::PARAM_STR);
    $stmt->bindValue(':duration_ms', $data['duration_ms'], PDO::PARAM_INT);
    $stmt->bindValue(':notes', $data['notes'] !== '' ? $data['notes'] : null, $data['notes'] !== '' ? PDO::PARAM_STR : PDO::PARAM_NULL);
    $stmt->execute();

    return (int) db()->lastInsertId();
}

function get_recent_presets(int $limit = 8): array
{
    $limit = max(1, min(24, $limit));
    $stmt = db()->query(
        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes, created_at
         FROM recliner_presets
         ORDER BY created_at DESC, id DESC
         LIMIT ' . $limit
    );

    return $stmt->fetchAll() ?: [];
}

function get_preset(int $id): ?array
{
    $stmt = db()->prepare(
        'SELECT id, name, angle_deg, intensity_pct, pattern_mode, duration_ms, notes, created_at
         FROM recliner_presets
         WHERE id = :id
         LIMIT 1'
    );
    $stmt->bindValue(':id', $id, PDO::PARAM_INT);
    $stmt->execute();
    $preset = $stmt->fetch();

    return $preset ?: null;
}

function preset_tone(int $angle): string
{
    if ($angle >= 135) {
        return 'Deep recline';
    }
    if ($angle >= 90) {
        return 'Lounge';
    }
    if ($angle >= 45) {
        return 'Reading';
    }

    return 'Upright';
}

function e(?string $value): string
{
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}