<?php
/**
 * Easy Stream Enhanced Moderation System
 * Advanced moderation with AI, rules, appeals
 * Version: 1.0
 */

defined('_ISVALID') or header('Location: /error');

class VModerationEnhanced {
    private static $db;

    public static function init() {
        self::$db = VDatabase::getInstance();
    }

    /**
     * Submit content for moderation
     * @param string $target_type Type (video, comment, user, post)
     * @param string $target_id Target ID
     * @param int $reporter_id Reporter user ID
     * @param string $reason Reason for report
     * @param string $priority Priority level
     * @return int Queue ID
     */
    public static function submitReport($target_type, $target_id, $reporter_id, $reason, $priority = 'medium') {
        self::init();

        $target_type = VDatabase::escape($target_type);
        $target_id = VDatabase::escape($target_id);
        $reporter_id = (int)$reporter_id;
        $reason = VDatabase::escape($reason);
        $priority = VDatabase::escape($priority);

        $sql = "INSERT INTO db_moderation_queue
                (target_type, target_id, reporter_id, reason, priority, status, created_at)
                VALUES ('$target_type', '$target_id', $reporter_id, '$reason', '$priority', 'pending', NOW())";

        if (self::$db->execute($sql)) {
            return self::$db->insert_id();
        }
        return false;
    }

    /**
     * Get moderation queue
     * @param string $status Filter by status
     * @param int $limit Number of items
     * @return array Queue items
     */
    public static function getQueue($status = 'pending', $limit = 50) {
        self::init();

        $status = VDatabase::escape($status);
        $limit = (int)$limit;

        $sql = "SELECT mq.*, au.usr_user as reporter_username
                FROM db_moderation_queue mq
                LEFT JOIN db_accountuser au ON mq.reporter_id = au.usr_id
                WHERE mq.status = '$status'
                ORDER BY
                    CASE priority
                        WHEN 'urgent' THEN 1
                        WHEN 'high' THEN 2
                        WHEN 'medium' THEN 3
                        ELSE 4
                    END,
                    mq.created_at ASC
                LIMIT $limit";

        $result = self::$db->execute($sql);
        $queue = [];

        if ($result) {
            while ($row = $result->FetchRow()) {
                $queue[] = $row;
            }
        }

        return $queue;
    }

    /**
     * Take moderation action
     * @param int $queue_id Queue item ID
     * @param int $moderator_id Moderator user ID
     * @param string $action Action taken
     * @param string $reason Reason for action
     * @return bool Success
     */
    public static function takeAction($queue_id, $moderator_id, $action, $reason) {
        self::init();

        $queue_id = (int)$queue_id;
        $moderator_id = (int)$moderator_id;
        $action = VDatabase::escape($action);
        $reason = VDatabase::escape($reason);

        // Get queue item
        $sql = "SELECT * FROM db_moderation_queue WHERE queue_id = $queue_id";
        $result = self::$db->execute($sql);

        if (!$result || $result->RecordCount() == 0) {
            return false;
        }

        $item = $result->FetchRow();

        // Record action
        $sql = "INSERT INTO db_moderation_actions
                (target_type, target_id, moderator_id, action, reason, is_automated, created_at)
                VALUES ('{$item['target_type']}', '{$item['target_id']}', $moderator_id, '$action', '$reason', 0, NOW())";

        if (!self::$db->execute($sql)) {
            return false;
        }

        $action_id = self::$db->insert_id();

        // Update queue
        $sql = "UPDATE db_moderation_queue
                SET status = 'resolved',
                    resolved_by = $moderator_id,
                    resolution = '$reason',
                    resolved_at = NOW()
                WHERE queue_id = $queue_id";

        self::$db->execute($sql);

        // Apply action based on type
        self::applyAction($item['target_type'], $item['target_id'], $action);

        // Add strike if needed
        if ($action == 'removed' || $action == 'banned') {
            self::addStrike($item['target_id'], $action_id, $action, $reason);
        }

        return true;
    }

    /**
     * Apply moderation action to target
     */
    private static function applyAction($target_type, $target_id, $action) {
        switch ($action) {
            case 'removed':
                if ($target_type == 'video') {
                    $target_id_safe = VDatabase::escape($target_id);
                    self::$db->execute("UPDATE db_videofiles SET privacy = 'removed', approved = 0 WHERE file_key = '$target_id_safe'");
                }
                break;

            case 'age_restricted':
                if ($target_type == 'video') {
                    $target_id_safe = VDatabase::escape($target_id);
                    self::$db->execute("UPDATE db_videofiles SET file_adult = 1 WHERE file_key = '$target_id_safe'");
                }
                break;

            case 'banned':
                if ($target_type == 'user') {
                    $usr_id = (int)$target_id;
                    self::$db->execute("UPDATE db_accountuser SET usr_status = 'suspended' WHERE usr_id = $usr_id");
                }
                break;
        }
    }

    /**
     * Add strike to user
     */
    private static function addStrike($usr_id, $action_id, $type, $reason) {
        $usr_id = (int)$usr_id;
        $action_id = (int)$action_id;
        $type_safe = VDatabase::escape($type);
        $reason_safe = VDatabase::escape($reason);

        // Determine strike type based on severity
        $strike_type = match($type) {
            'removed' => 'strike',
            'banned' => 'ban',
            default => 'warning'
        };

        $sql = "INSERT INTO db_user_strikes
                (usr_id, action_id, type, reason, is_active, created_at)
                VALUES ($usr_id, $action_id, '$strike_type', '$reason_safe', 1, NOW())";

        return self::$db->execute($sql);
    }

    /**
     * Get user strikes
     */
    public static function getUserStrikes($usr_id) {
        self::init();
        $usr_id = (int)$usr_id;

        $sql = "SELECT * FROM db_user_strikes
                WHERE usr_id = $usr_id AND is_active = 1
                ORDER BY created_at DESC";

        $result = self::$db->execute($sql);
        $strikes = [];

        if ($result) {
            while ($row = $result->FetchRow()) {
                $strikes[] = $row;
            }
        }

        return $strikes;
    }

    /**
     * Submit appeal
     */
    public static function submitAppeal($action_id, $usr_id, $reason, $evidence = []) {
        self::init();

        $action_id = (int)$action_id;
        $usr_id = (int)$usr_id;
        $reason_safe = VDatabase::escape($reason);
        $evidence_json = VDatabase::escape(json_encode($evidence));

        $sql = "INSERT INTO db_moderation_appeals
                (action_id, usr_id, reason, evidence, status, created_at)
                VALUES ($action_id, $usr_id, '$reason_safe', '$evidence_json', 'pending', NOW())";

        if (self::$db->execute($sql)) {
            // Mark action as appealed
            self::$db->execute("UPDATE db_moderation_actions SET is_appealed = 1 WHERE action_id = $action_id");
            return self::$db->insert_id();
        }

        return false;
    }

    /**
     * Get pending appeals
     */
    public static function getPendingAppeals($limit = 50) {
        self::init();
        $limit = (int)$limit;

        $sql = "SELECT ma.*, au.usr_user, au.usr_email
                FROM db_moderation_appeals ma
                JOIN db_accountuser au ON ma.usr_id = au.usr_id
                WHERE ma.status = 'pending'
                ORDER BY ma.created_at ASC
                LIMIT $limit";

        $result = self::$db->execute($sql);
        $appeals = [];

        if ($result) {
            while ($row = $result->FetchRow()) {
                $row['evidence'] = json_decode($row['evidence'], true);
                $appeals[] = $row;
            }
        }

        return $appeals;
    }

    /**
     * Review appeal
     */
    public static function reviewAppeal($appeal_id, $reviewer_id, $status, $notes) {
        self::init();

        $appeal_id = (int)$appeal_id;
        $reviewer_id = (int)$reviewer_id;
        $status_safe = VDatabase::escape($status);
        $notes_safe = VDatabase::escape($notes);

        $sql = "UPDATE db_moderation_appeals
                SET status = '$status_safe',
                    reviewed_by = $reviewer_id,
                    review_notes = '$notes_safe',
                    reviewed_at = NOW()
                WHERE appeal_id = $appeal_id";

        if (!self::$db->execute($sql)) {
            return false;
        }

        // If approved, restore content
        if ($status == 'approved') {
            $sql = "SELECT action_id FROM db_moderation_appeals WHERE appeal_id = $appeal_id";
            $result = self::$db->execute($sql);
            if ($result) {
                $row = $result->FetchRow();
                $action_id = (int)$row['action_id'];

                // Get original action
                $sql = "SELECT * FROM db_moderation_actions WHERE action_id = $action_id";
                $result = self::$db->execute($sql);
                if ($result) {
                    $action = $result->FetchRow();
                    self::restoreContent($action['target_type'], $action['target_id']);
                }
            }
        }

        return true;
    }

    /**
     * Restore content after successful appeal
     */
    private static function restoreContent($target_type, $target_id) {
        if ($target_type == 'video') {
            $target_id_safe = VDatabase::escape($target_id);
            self::$db->execute("UPDATE db_videofiles SET privacy = 'public', approved = 1 WHERE file_key = '$target_id_safe'");
        }
    }
}