<?php
// backend/ride/rides/streak_helper.php

function handleDriverStreak($con, $driver_id, $action) {
    try {
        if ($action === 'reset') {
            $stmt = $con->prepare("
                INSERT INTO driver_streaks (driver_id, current_streak, zero_commission_until) 
                VALUES (?, 0, NULL) 
                ON DUPLICATE KEY UPDATE current_streak = 0
            ");
            $stmt->execute([$driver_id]);
        } elseif ($action === 'increment') {
            $stmt = $con->prepare("SELECT current_streak FROM driver_streaks WHERE driver_id = ?");
            $stmt->execute([$driver_id]);
            $row = $stmt->fetch(PDO::FETCH_ASSOC);
            
            $current = $row ? intval($row['current_streak']) + 1 : 1;
            
            $zero_until = NULL;
            if ($current >= 5) {
                // Reward unlocked! 0% commission until end of today
                $zero_until = date('Y-m-d 23:59:59'); 
                $current = 0; // reset for next streak
            }
            
            $stmt2 = $con->prepare("
                INSERT INTO driver_streaks (driver_id, current_streak, best_streak, zero_commission_until) 
                VALUES (?, ?, ?, ?) 
                ON DUPLICATE KEY UPDATE 
                    current_streak = ?,
                    best_streak = GREATEST(best_streak, ?),
                    zero_commission_until = COALESCE(?, zero_commission_until)
            ");
            $stmt2->execute([
                $driver_id, 
                $current, 
                $current, 
                $zero_until, 
                
                $current, 
                $current, 
                $zero_until
            ]);
        }
        
        // 🆕 Invalidate Redis Cache (Cache-Aside pattern)
        global $redis;
        if (isset($redis)) {
            try {
                $redis->del("driver_streak:{$driver_id}");
                $redis->del("gamification_dashboard:{$driver_id}");
            } catch (Exception $e) {
                error_log("[streak_helper] Redis Cache Invalidation Error: " . $e->getMessage());
            }
        }
        
    } catch (Exception $e) {
        error_log("[streak_helper] Error: " . $e->getMessage());
    }
}

function hasZeroCommission($con, $driver_id) {
    try {
        $stmt = $con->prepare("SELECT zero_commission_until FROM driver_streaks WHERE driver_id = ?");
        $stmt->execute([$driver_id]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);
        if ($row && !empty($row['zero_commission_until'])) {
            return (strtotime($row['zero_commission_until']) > time());
        }
    } catch (Exception $e) {
        error_log("[streak_helper] Error checking commission: " . $e->getMessage());
    }
    return false;
}
?>