<?php

namespace App\RSpade\Core\Session;

use RuntimeException;
use App\RSpade\Core\Database\Models\Rsx_System_Model_Abstract;
use App\RSpade\Core\Manifest\Manifest;
use App\RSpade\Core\Models\Login_User_Model;
use App\RSpade\Core\Models\Site_Model;
use App\RSpade\Core\Models\User_Model;
use App\RSpade\Core\Session\User_Agent;

/**
 * Session model - handles both authentication sessions and static session management
 *
 * This class serves dual purposes:
 * 1. As a Laravel Eloquent model for the sessions table
 * 2. As a static interface for session management (similar to RS3 design)
 *
 * The session represents a unique browser session with persistent authentication.
 * Sessions are always persistent (365 days) - no "remember me" option.
 *
 * @FILE-SUBCLASS-01-EXCEPTION Class intentionally named Session instead of Session_Model
 * to maintain compatibility with static method calls like Session::init().  The developer will
 * almost never be interacting with a session orm record directly, so the term Session_Model
 * doesnt have much meaning.
 *
 * @property int $id
 * @property bool $active
 * @property int $site_id
 * @property int $login_user_id
 * @property int $experience_id
 * @property string $session_token
 * @property string $csrf_token
 * @property string $ip_address
 * @property string $user_agent
 * @property \Carbon\Carbon $last_active
 * @property int $version
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 */
/**
 * _AUTO_GENERATED_ Database type hints - do not edit manually
 * Generated on: 2025-12-26 02:43:29
 * Table: _sessions
 *
 * @property int $id
 * @property bool $active
 * @property int $site_id
 * @property int $login_user_id
 * @property mixed $session_token
 * @property mixed $csrf_token
 * @property mixed $ip_address
 * @property mixed $user_agent
 * @property string $last_active
 * @property int $version
 * @property string $created_at
 * @property string $updated_at
 * @property int $created_by
 * @property int $updated_by
 * @property int $experience_id
 *
 * @mixin \Eloquent
 */
class Session extends Rsx_System_Model_Abstract
       {
    // Enum definitions (required by abstract parent)
    public static $enums = [];

    // Static session management properties
    private static $_session = null;

    private static $_site = null;

    private static $_login_user = null; // Authentication identity (Login_User_Model)

    private static $_user = null; // Site-specific user (User_Model)

    private static $_session_token = null;

    private static $_has_init = false;

    private static $_has_activate = false;

    private static $_has_set_cookie = false;

    // Experience and request-scoped overrides
    private static $_experience_id = 0;

    private static $_request_site_id_override = null;

    // CLI mode properties (static-only, no database)
    private static $_cli_site_id = null;

    private static $_cli_login_user_id = null; // Authentication identity ID

    private static $_cli_user_id = null; // Site-specific user ID

    private static $_cli_experience_id = 0;

    /**
     * The table associated with the model
     * @var string
     */
    protected $table = '_sessions';

    /**
     * The attributes that should be cast
     * @var array
     */
    protected $casts = [
        'active' => 'boolean',
        'site_id' => 'integer',
        'login_user_id' => 'integer',
        'experience_id' => 'integer',
        'version' => 'integer',
        'last_active' => 'datetime',
    ];

    /**
     * Columns that should never be exported to JavaScript
     * @var array
     */
    protected $neverExport = [
        'session_token',
        'csrf_token',
        'ip_address',
    ];

    /**
     * Check if running in CLI mode
     * @return bool
     */
    private static function __is_cli(): bool
    {
        return php_sapi_name() === 'cli';
    }

    /**
     * Initialize session from cookie or request
     * Loads existing session but does not create new one
     * Filters by current experience_id to support multiple authentication realms
     * In CLI mode: does nothing
     * @return void
     */
    public static function init(): void
    {
        if (self::$_has_init) {
            return;
        }
        self::$_has_init = true;

        // CLI mode: do nothing
        if (self::__is_cli()) {
            return;
        }

        Manifest::init();

        // Try to get session token from cookie or request
        $session_token = $_COOKIE['rsx'] ?? null;

        if (empty($session_token)) {
            self::$_session = null;

            return;
        }

        // Load session for CURRENT EXPERIENCE only
        // This allows same cookie to have different sessions per experience
        $session = static::where('session_token', $session_token)
            ->where('active', true)
            ->where('experience_id', self::$_experience_id)
            ->first();

        if (!$session) {
            self::$_session = null;

            return;
        }

        // Update last activity (but don't save immediately to avoid version conflicts)
        $session->last_active = now();

        // We'll let the session save happen later if needed (e.g. in set_user)
        // For simple page loads, we can update last_active in a separate query
        static::where('id', $session->id)->update(['last_active' => now()]);

        // Reload the session to ensure we have the latest version
        $session = static::find($session->id);

        self::$_session_token = $session_token;
        self::$_session = $session;

        self::_set_cookie();
    }

    /**
     * Activate session - creates new one if needed
     * In CLI mode: does nothing
     * @return void
     */
    private static function __activate(): void
    {
        if (self::$_has_activate) {
            return;
        }
        self::$_has_activate = true;

        // CLI mode: do nothing
        if (self::__is_cli()) {
            return;
        }

        self::init();

        // If no session exists, create one
        if (empty(self::$_session)) {
            // Generate cryptographically secure token
            self::$_session_token = bin2hex(random_bytes(32));

            // Generate CSRF token
            $csrf_token = bin2hex(random_bytes(32));

            $session = new static();
            $session->session_token = self::$_session_token;
            $session->csrf_token = $csrf_token;
            $session->ip_address = self::__get_client_ip();
            $session->user_agent = substr($_SERVER['HTTP_USER_AGENT'] ?? '', 0, 255);
            $session->last_active = now();
            $session->active = true;
            $session->site_id = 0;
            $session->experience_id = self::$_experience_id;
            $session->version = 1;

            $session->save();

            self::$_session = $session;
            self::_set_cookie();
        }
    }

    /**
     * Set the session cookie with security flags
     * In CLI mode: does nothing
     * @return void
     */
    private static function _set_cookie(): void
    {
        if (self::$_has_set_cookie) {
            return;
        }
        self::$_has_set_cookie = true;

        // CLI mode: do nothing
        if (self::__is_cli()) {
            return;
        }

        // Set cookie with security flags
        setcookie('rsx', self::$_session_token, [
            'expires' => time() + (365 * 86400), // 1 year
            'path' => '/',
            'domain' => '', // Current domain only
            'secure' => true, // HTTPS only
            'httponly' => true, // No JavaScript access
            'samesite' => 'Lax', // CSRF protection
        ]);
    }

    /**
     * Get client IP address, handling proxies
     * In CLI mode: returns "CLI"
     * @return string
     */
    private static function __get_client_ip(): string
    {
        // CLI mode: return "CLI"
        if (self::__is_cli()) {
            return 'CLI';
        }

        // Check for forwarded IP (when behind proxy/CDN)
        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

            return trim($ips[0]);
        }

        if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
            return $_SERVER['HTTP_X_REAL_IP'];
        }

        return $_SERVER['REMOTE_ADDR'] ?? '0.0.0.0';
    }

    /**
     * Reset/logout the current session
     * @return void
     */
    public static function reset(): void
    {
        self::init();

        if (!empty(self::$_session)) {
            self::$_session->active = false;
            self::$_session->save();
        }

        self::$_session = null;
        self::$_site = null;
        self::$_user = null;
        self::$_has_init = false;
        self::$_has_activate = false;
        self::$_has_set_cookie = false;

        // Clear cookie
        setcookie('rsx', '', [
            'expires' => time() - 3600,
            'path' => '/',
            'domain' => '',
            'secure' => true,
            'httponly' => true,
            'samesite' => 'Lax',
        ]);
    }

    /**
     * Get site ID for current session
     * Respects request-scoped override first (for subdomain enforcement)
     * In CLI mode: returns static CLI property
     * @return int
     */
    public static function get_site_id(): int
    {
        // Request override takes precedence (subdomain enforcement)
        if (self::$_request_site_id_override !== null) {
            return self::$_request_site_id_override;
        }

        // CLI mode: return static property
        if (self::__is_cli()) {
            return self::$_cli_site_id ?? 0;
        }

        self::init();

        if (empty(self::$_session)) {
            return 0;
        }

        return self::$_session->site_id ?? 0;
    }

    /**
     * Get site model for current session
     * @return Site_Model|null
     */
    public static function get_site()
    {
        $site_id = self::get_site_id();

        if ($site_id === 0) {
            return null;
        }

        if (empty(self::$_site)) {
            self::$_site = Site_Model::find($site_id);
        }

        return self::$_site;
    }

    /**
     * Get login user ID (authentication identity) for current session
     * In CLI mode: returns static CLI property
     * @return int|null
     */
    public static function get_login_user_id()
    {
        // CLI mode: return static property
        if (self::__is_cli()) {
            return self::$_cli_login_user_id;
        }

        self::init();

        if (empty(self::$_session)) {
            return null;
        }

        return self::$_session->login_user_id;
    }

    /**
     * Get site-specific user ID for current session
     * This is the users.id (site-specific), not login_users.id
     * In CLI mode: returns static CLI property
     * @return int|null
     */
    public static function get_user_id()
    {
        // CLI mode: return static property
        if (self::__is_cli()) {
            return self::$_cli_user_id;
        }

        $user = self::get_user();

        return $user ? $user->id : null;
    }

    /**
     * Check if user is logged in
     * @return bool
     */
    public static function is_logged_in(): bool
    {
        return !empty(self::get_login_user_id());
    }

    /**
     * Get login user model (authentication identity) for current session
     * @return Login_User_Model|null
     */
    public static function get_login_user()
    {
        $login_user_id = self::get_login_user_id();

        if (empty($login_user_id)) {
            return null;
        }

        if (empty(self::$_login_user)) {
            self::$_login_user = Login_User_Model::find($login_user_id);
        }

        return self::$_login_user;
    }

    /**
     * Get site-specific user model for current session
     * @return User_Model|null
     */
    public static function get_user()
    {
        $login_user_id = self::get_login_user_id();
        $site_id = self::get_site_id();

        if (empty($login_user_id) || empty($site_id)) {
            return null;
        }

        if (empty(self::$_user)) {
            self::$_user = User_Model::where('login_user_id', $login_user_id)
                ->where('site_id', $site_id)
                ->first();
        }

        return self::$_user;
    }

    /**
     * Get current session model (creates if needed)
     * @return Session
     */
    public static function get_session(): Session
    {
        self::__activate();

        return self::$_session;
    }

    /**
     * Get current session ID (creates session if needed)
     * @return int
     */
    public static function get_session_id(): int
    {
        self::__activate();

        return self::$_session->id;
    }

    /**
     * Get CSRF token for current session
     * @return string|null
     */
    public static function get_csrf_token(): ?string
    {
        self::init();

        if (empty(self::$_session)) {
            return null;
        }

        return self::$_session->csrf_token;
    }

    /**
     * Verify CSRF token
     * @param string $token
     * @return bool
     */
    public static function verify_csrf_token(string $token): bool
    {
        self::init();

        if (empty(self::$_session)) {
            return false;
        }

        // Use constant-time comparison
        return hash_equals(self::$_session->csrf_token, $token);
    }

    /**
     * Logout current user
     * @return void
     */
    public static function logout(): void
    {
        self::set_login_user_id(null);
    }

    /**
     * Set login user ID for current session (login/logout)
     * In CLI mode: sets static CLI property only, no database
     * @param int|null $login_user_id Login user ID, or null to logout
     * @return void
     */
    public static function set_login_user_id(?int $login_user_id): void
    {
        // Logout if null/0
        if (empty($login_user_id)) {
            // CLI mode: clear static property only
            if (self::__is_cli()) {
                self::$_cli_login_user_id = null;
                self::$_cli_user_id = null;
                self::$_login_user = null;
                self::$_user = null;
                self::$_site = null;

                return;
            }

            self::__activate();
            self::$_session->login_user_id = null;
            self::$_session->save();

            self::$_login_user = null;
            self::$_user = null;
            self::$_site = null;

            return;
        }

        // CLI mode: set static property only
        if (self::__is_cli()) {
            self::$_cli_login_user_id = $login_user_id;
            self::$_cli_user_id = null;
            self::$_login_user = null;
            self::$_user = null;
            self::$_site = null;

            return;
        }

        self::__activate();

        // Regenerate session token and CSRF token on login (prevent session fixation)
        $new_token = bin2hex(random_bytes(32));
        $new_csrf = bin2hex(random_bytes(32));
        self::$_session->session_token = $new_token;
        self::$_session->csrf_token = $new_csrf;
        self::$_session->login_user_id = $login_user_id;
        self::$_session->version++;
        self::$_session->save();

        self::$_session_token = $new_token;
        self::$_has_set_cookie = false; // Force new cookie
        self::_set_cookie();

        // Clear cached login_user/user/site
        self::$_login_user = null;
        self::$_user = null;
        self::$_site = null;

        // Update login user's last login timestamp
        $login_user_record = self::get_login_user();
        if ($login_user_record) {
            $login_user_record->last_login = now();
            $login_user_record->save();
        }
    }

    /**
     * Set site for current session
     * In CLI mode: sets static CLI property only, no database
     * @param Site_Model|int $site Site model or site ID
     * @return void
     */
    /**
     * Set site ID
     * In CLI mode: sets static CLI property only
     * @param int $site_id
     * @return void
     */
    public static function set_site_id(int $site_id): void
    {
        // CLI mode: set static property only
        if (self::__is_cli()) {
            self::$_cli_site_id = $site_id;
            self::$_site = null;

            return;
        }

        self::__activate();

        // Skip if already set
        if (self::get_site_id() === $site_id) {
            return;
        }

        self::$_session->site_id = $site_id;
        self::$_session->version++;
        self::$_session->save();

        // Clear cached site
        self::$_site = null;
    }

    /**
     * Check if a session exists
     * In CLI mode: returns true if site_id or user_id is set
     * In web mode: returns true if session record exists
     * @return bool
     */
    public static function has_session(): bool
    {
        // CLI mode: check if site_id or user_id is set
        if (self::__is_cli()) {
            return self::$_cli_site_id !== null || self::$_cli_user_id !== null;
        }

        // Web mode: init and check if session exists
        self::init();

        return !empty(self::$_session);
    }

    /**
     * Get session by token (for API/external access)
     * @param string $token
     * @return Session|null
     */
    public static function find_by_token(string $token)
    {
        return static::where('session_token', $token)
            ->where('active', true)
            ->first();
    }

    /**
     * Clean up expired sessions (garbage collection)
     * @param int $days_until_expiry
     * @return int Number of sessions deleted
     */
    public static function cleanup_expired(int $days_until_expiry = 365): int
    {
        return static::where('last_active', '<', now()->subDays($days_until_expiry))
            ->delete();
    }

    /**
     * Override save to increment version on updates
     * @param array $options
     * @return bool
     */
    public function save(array $options = []): bool
    {
        // Increment version on updates (but don't check for conflicts since sessions
        // are single-user and shouldn't have real concurrent modifications)
        if ($this->exists && $this->isDirty()) {
            $this->version = ($this->version ?? 1) + 1;
        }

        return parent::save($options);
    }

    /**
     * Relationship: Login User (authentication identity)
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function login_user()
    {
        return $this->belongsTo(Login_User_Model::class, 'login_user_id');
    }

    /**
     * Relationship: Site
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function site()
    {
        return $this->belongsTo(Site_Model::class, 'site_id');
    }

    /**
     * Relationship: Site-specific User (composite key relationship)
     * Returns the User_Model that matches both login_user_id and site_id
     * @return \Illuminate\Database\Eloquent\Relations\HasOne
     */
    public function user()
    {
        return $this->hasOne(User_Model::class, 'login_user_id', 'login_user_id')
            ->where('users.site_id', '=', $this->site_id);
    }

    /**
     * Set experience context for current request
     * Determines which authentication realm we're in (default=0, staff=1, customer=2, etc.)
     * Does NOT persist to database - request-scoped only
     * Clears cached session/user/site since experience changed
     * In CLI mode: sets static CLI property
     * @param int $experience_id
     * @return void
     */
    public static function set_experience_id(int $experience_id): void
    {
        if (self::__is_cli()) {
            self::$_cli_experience_id = $experience_id;

            return;
        }

        self::$_experience_id = $experience_id;

        // Clear cached data since experience changed
        self::$_user = null;
        self::$_site = null;
        self::$_session = null;

        // Force re-init with new experience context
        self::$_has_init = false;
        self::init();
    }

    /**
     * Get current experience ID
     * In CLI mode: returns static CLI property
     * @return int
     */
    public static function get_experience_id(): int
    {
        if (self::__is_cli()) {
            return self::$_cli_experience_id;
        }

        return self::$_experience_id;
    }

    /**
     * Set site_id override for current request (subdomain enforcement)
     * This overrides the database session site_id for THIS REQUEST ONLY
     * Does NOT modify the session record
     * Use case: User visits subdomain assigned to a tenant, enforce that tenant
     * @param int $site_id
     * @return void
     */
    public static function set_request_site_id_override(int $site_id): void
    {
        self::$_request_site_id_override = $site_id;
        self::$_site = null; // Clear cached site
    }

    /**
     * Clear site_id override (return to normal session-based site_id)
     * @return void
     */
    public static function clear_request_site_id_override(): void
    {
        self::$_request_site_id_override = null;
        self::$_site = null; // Clear cached site
    }

    /**
     * Check if request has site_id override active
     * @return bool
     */
    public static function has_request_site_id_override(): bool
    {
        return self::$_request_site_id_override !== null;
    }

    // =========================================================================
    // SESSION MANAGEMENT METHODS
    // =========================================================================

    /**
     * Get all active sessions for a login user
     * Returns formatted session info including device/location parsing
     *
     * @param int|null $login_user_id If null, uses current logged-in user
     * @return array Array of session info
     */
    public static function get_sessions_for_user(?int $login_user_id = null): array
    {
        if ($login_user_id === null) {
            $login_user_id = self::get_login_user_id();
        }

        if (empty($login_user_id)) {
            return [];
        }

        $current_session_id = self::has_session() ? self::$_session?->id : null;

        return static::where('login_user_id', $login_user_id)
            ->where('active', true)
            ->orderBy('last_active', 'desc')
            ->get()
            ->map(function ($session) use ($current_session_id) {
                $parsed_ua = User_Agent::parse($session->user_agent);

                return [
                    'id' => $session->id,
                    'ip_address' => $session->ip_address,
                    'user_agent' => $session->user_agent,
                    'user_agent_parsed' => $parsed_ua,
                    'device_summary' => $parsed_ua['summary'],
                    'location' => self::_format_session_location($session),
                    'last_active' => $session->last_active,
                    'created_at' => $session->created_at,
                    'is_current' => $session->id === $current_session_id,
                ];
            })
            ->toArray();
    }

    /**
     * Terminate a specific session by ID
     * Cannot terminate the current session (use logout() instead)
     *
     * @param int $session_id
     * @return bool True if session was terminated, false if not found or is current
     */
    public static function terminate_session(int $session_id): bool
    {
        self::init();

        // Don't allow terminating current session
        if (self::$_session && self::$_session->id === $session_id) {
            return false;
        }

        $affected = static::where('id', $session_id)
            ->where('active', true)
            ->update(['active' => false]);

        return $affected > 0;
    }

    /**
     * Terminate all sessions for the current user except the current one
     *
     * @return int Number of sessions terminated
     */
    public static function terminate_all_other_sessions(): int
    {
        self::init();

        $login_user_id = self::get_login_user_id();
        if (empty($login_user_id)) {
            return 0;
        }

        $query = static::where('login_user_id', $login_user_id)
            ->where('active', true);

        // Exclude current session if we have one
        if (self::$_session) {
            $query->where('id', '!=', self::$_session->id);
        }

        return $query->update(['active' => false]);
    }

    /**
     * Terminate all sessions for a specific login user
     * Useful for admin actions or password changes
     *
     * @param int $login_user_id
     * @param int|null $except_session_id Optional session ID to exclude
     * @return int Number of sessions terminated
     */
    public static function terminate_all_sessions_for_user(int $login_user_id, ?int $except_session_id = null): int
    {
        $query = static::where('login_user_id', $login_user_id)
            ->where('active', true);

        if ($except_session_id !== null) {
            $query->where('id', '!=', $except_session_id);
        }

        return $query->update(['active' => false]);
    }

    /**
     * Get information about the current session
     * Returns formatted info with device/location parsing
     *
     * @return array|null Session info or null if not logged in
     */
    public static function get_current_session_info(): ?array
    {
        self::init();

        if (empty(self::$_session)) {
            return null;
        }

        $parsed_ua = User_Agent::parse(self::$_session->user_agent);

        return [
            'id' => self::$_session->id,
            'ip_address' => self::$_session->ip_address,
            'user_agent' => self::$_session->user_agent,
            'user_agent_parsed' => $parsed_ua,
            'device_summary' => $parsed_ua['summary'],
            'location' => self::_format_session_location(self::$_session),
            'last_active' => self::$_session->last_active,
            'created_at' => self::$_session->created_at,
            'is_current' => true,
        ];
    }

    /**
     * Format location string from session (placeholder for future geo lookup)
     *
     * @param Session $session
     * @return string|null
     */
    private static function _format_session_location($session): ?string
    {
        // Future: Implement geo lookup based on IP
        // For now, return null (location not available)
        return null;
    }
}