<?php
/**
 * Centrale Systeeminstellingen Helper voor Fociz
 * Beheert organisatie-brede werkdagstandaarden (v1.4) en AI configuratie (v1.5).
 */

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

/**
 * Zorgt ervoor dat de system_settings tabel bestaat in MariaDB
 */
function ensure_system_settings_table(?PDO $db = null): void {
    static $ensured = false;
    if ($ensured) return;

    try {
        $pdo = $db ?: get_db_connection();
        $pdo->exec("
            CREATE TABLE IF NOT EXISTS `system_settings` (
                `setting_key` VARCHAR(64) PRIMARY KEY,
                `setting_value` TEXT NULL,
                `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
        ");
        $ensured = true;
    } catch (Throwable $e) {
        error_log("ensure_system_settings_table error: " . $e->getMessage());
    }
}

/**
 * Haalt een enkele instelling op uit MariaDB
 */
function get_system_setting(string $key, $default = null) {
    try {
        $db = get_db_connection();
        ensure_system_settings_table($db);

        $stmt = $db->prepare("SELECT setting_value FROM system_settings WHERE setting_key = ?");
        $stmt->execute([$key]);
        $val = $stmt->fetchColumn();

        if ($val === false || $val === null) {
            return $default;
        }

        // Decodeer JSON indien van toepassing
        $decoded = json_decode($val, true);
        if (json_last_error() === JSON_ERROR_NONE) {
            return $decoded;
        }

        return $val;
    } catch (Throwable $e) {
        error_log("get_system_setting error for {$key}: " . $e->getMessage());
        return $default;
    }
}

/**
 * Slaat een instelling op in MariaDB
 */
function set_system_setting(string $key, $value): bool {
    try {
        $db = get_db_connection();
        ensure_system_settings_table($db);

        $valToStore = is_array($value) || is_object($value) ? json_encode($value) : (string)$value;

        $stmt = $db->prepare("
            INSERT INTO system_settings (setting_key, setting_value)
            VALUES (?, ?)
            ON DUPLICATE KEY UPDATE setting_value = VALUES(setting_value), updated_at = NOW()
        ");
        return $stmt->execute([$key, $valToStore]);
    } catch (Throwable $e) {
        error_log("set_system_setting error for {$key}: " . $e->getMessage());
        return false;
    }
}

/**
 * Haalt alle organisatie werkdag standaarden op (Release v1.4)
 */
function get_workday_settings(): array {
    return [
        'workday_start'         => get_system_setting('workday_start', '08:30'),
        'workday_end'           => get_system_setting('workday_end', '17:30'),
        'lunch_start'           => get_system_setting('lunch_start', '12:30'),
        'lunch_end'             => get_system_setting('lunch_end', '13:00'),
        'pomodoro_focus'        => (int)get_system_setting('pomodoro_focus', 25),
        'pomodoro_deep'         => (int)get_system_setting('pomodoro_deep', 50),
        'pomodoro_break'        => (int)get_system_setting('pomodoro_break', 5),
        'default_task_duration' => (int)get_system_setting('default_task_duration', 30),
    ];
}

/**
 * Haalt AI configuratie-instellingen op (Release v1.5)
 */
function get_ai_settings(): array {
    $envKey = fociz_env('OPENAI_API_KEY', '');
    $savedKey = get_system_setting('ai_api_key', '');
    $apiKey = !empty($savedKey) ? $savedKey : $envKey;

    return [
        'ai_enabled'  => (bool)get_system_setting('ai_enabled', !empty($apiKey)),
        'ai_provider' => get_system_setting('ai_provider', 'openai'),
        'ai_api_key'  => $apiKey,
        'ai_model'    => get_system_setting('ai_model', 'gpt-4o-mini'),
        'has_key'     => !empty($apiKey),
    ];
}