feat: add battery rent support and integrate adjusted battery costs into rental billing calculations

src/app/admin/rentals/page.tsx

@@ -171,6 +171,7 @@ const mockRentals: Rental[] = [
     dailyRate: 150,
     weeklyRate: 900,
     monthlyRate: 3500,
+    batteryRent: 1500,
     totalPaid: 38500,
     dueRental: 0,
     pendingRent: 0,
@@ -272,6 +273,7 @@ const mockRentals: Rental[] = [
     dailyRate: 100,
     weeklyRate: 600,
     monthlyRate: 2200,
+    batteryRent: 1500,
     totalPaid: 2600,
     dueRental: 600,
     pendingRent: 600,
@@ -692,23 +694,42 @@ export default function RentalsPage() {
                     </td> */}
                     <td className="px-4 py-3">
                       {(() => {
-                        const rent = rental[rental.subscriptionType === 'daily' ? 'dailyRate' : rental.subscriptionType === 'weekly' ? 'weeklyRate' : 'monthlyRate'];
+                        const bikeRent = rental[rental.subscriptionType === 'daily' ? 'dailyRate' : rental.subscriptionType === 'weekly' ? 'weeklyRate' : 'monthlyRate'];
-                        const due = rental.pendingRent || 0;
+                        const batteryRent = rental.batteryRent || 0;
+                        const batteryRentAdjusted = rental.subscriptionType === 'daily'
+                          ? Math.round(batteryRent / 30)
+                          : rental.subscriptionType === 'weekly'
+                            ? Math.round(batteryRent / 4)
+                            : batteryRent;
+                        const totalRent = bikeRent + batteryRentAdjusted;
+                        const due = rental.pendingRent + rental.batteryRentPending || 0;
                         const penalty = rental.penaltyAmount || 0;
                         const totalDue = due + penalty;
+                        const periodLabel = rental.subscriptionType === 'daily' ? 'day' : rental.subscriptionType === 'weekly' ? 'wk' : 'mo';
                         if (totalDue > 0) {
                           return (
-                            <div>
+                            <div className="space-y-1">
                               <span className="text-sm font-medium text-amber-600">৳{totalDue.toLocaleString()}</span>
-                              <p className="text-xs text-slate-400">{rental.subscriptionType} ৳{rent}/{(rental.subscriptionType === 'daily' ? 'day' : rental.subscriptionType === 'weekly' ? 'wk' : 'mo')}</p>
+                              {batteryRent > 0 ? (
-                              {penalty > 0 && <span className="text-xs text-red-500">+৳{penalty} penalty</span>}
+                                <p className="text-xs text-slate-500">
+                                  {rental.subscriptionType} ৳{bikeRent}{periodLabel} +Battery: ৳{batteryRentAdjusted}{periodLabel}
+                                </p>
+                              ) : (
+                                <p className="text-xs text-red-400">{rental.subscriptionType} ৳{totalRent}{periodLabel} +৳{penalty} penalty</p>
+                              )}
                             </div>
                           );
                         }
                         return (
-                          <div>
+                          <div className="space-y-1">
-                            <span className="text-sm font-medium text-slate-700">৳{rent.toLocaleString()}</span>
+                            <span className="text-sm font-medium text-slate-700">৳{totalRent.toLocaleString()}</span>
-                            <p className="text-xs text-slate-400 capitalize">{rental.subscriptionType}</p>
+                            {batteryRent > 0 ? (
+                              <p className="text-xs text-slate-500">
+                                {rental.subscriptionType} ৳{bikeRent}{periodLabel} +Battery: ৳{batteryRentAdjusted}{periodLabel}
+                              </p>
+                            ) : (
+                              <p className="text-xs text-slate-400 capitalize">{rental.subscriptionType}</p>
+                            )}
                           </div>
                         );
                       })()}
@@ -800,18 +821,39 @@ export default function RentalsPage() {
                       {rental.depositPaid ? 'Paid' : 'Unpaid'}
                     </span>
                   </div>
-                  {totalDue > 0 ? (
+                  {(() => {
-                    <div className="text-right">
+                    const batteryRent = rental.batteryRent || 0;
-                      <span className="text-sm font-medium text-amber-600">৳{totalDue.toLocaleString()}</span>
+                    const batteryRentAdjusted = rental.subscriptionType === 'daily'
-                      <p className="text-xs text-slate-400">{rental.subscriptionType} ৳{rent}/{(rental.subscriptionType === 'daily' ? 'day' : rental.subscriptionType === 'weekly' ? 'wk' : 'mo')}</p>
+                      ? Math.round(batteryRent / 30)
-                      {penalty > 0 && <span className="text-xs text-red-500">+৳{penalty}</span>}
+                      : rental.subscriptionType === 'weekly'
-                    </div>
+                        ? Math.round(batteryRent / 4)
-                  ) : (
+                        : batteryRent;
-                    <div className="text-right">
+                    const totalRent = rent + batteryRentAdjusted;
-                      <span className="text-sm font-medium text-slate-700">৳{rent.toLocaleString()}</span>
+                    const periodLabel = rental.subscriptionType === 'daily' ? 'day' : rental.subscriptionType === 'weekly' ? 'wk' : 'mo';
-                      <p className="text-xs text-slate-400 capitalize">{rental.subscriptionType}</p>
+                    return totalDue > 0 ? (
-                    </div>
+                      <div className="text-right">
-                  )}
+                        <span className="text-sm font-medium text-amber-600">৳{totalDue.toLocaleString()}</span>
+                        {batteryRent > 0 ? (
+                          <p className="text-xs text-slate-500">
+                            {rental.subscriptionType} ৳{rent}{periodLabel} +Battery: ৳{batteryRentAdjusted}{periodLabel} +৳{penalty} penalty
+                          </p>
+                        ) : (
+                          <p className="text-xs text-slate-400">{rental.subscriptionType} ৳{totalRent}{periodLabel} +৳{penalty} penalty</p>
+                        )}
+                      </div>
+                    ) : (
+                      <div className="text-right">
+                        <span className="text-sm font-medium text-slate-700">৳{totalRent.toLocaleString()}</span>
+                        {batteryRent > 0 ? (
+                          <p className="text-xs text-slate-500">
+                            {rental.subscriptionType} ৳{rent}{periodLabel} +Battery: ৳{batteryRentAdjusted}{periodLabel}
+                          </p>
+                        ) : (
+                          <p className="text-xs text-slate-400 capitalize">{rental.subscriptionType}</p>
+                        )}
+                      </div>
+                    );
+                  })()}
                 </div>
 
                 <div className="flex items-center gap-1.5 pt-1">
@@ -967,10 +1009,21 @@ export default function RentalsPage() {
                       <span className="text-xs text-emerald-600 font-medium uppercase tracking-wide">{newRental.planConditionName}</span>
                     </div>
                     <p className="text-sm text-slate-600">Deposit: <span className="font-semibold text-slate-800">৳{selectedPlan?.deposit.toLocaleString()}</span></p>
-                    <p className="text-sm text-slate-600">
+                    <div className="text-sm text-slate-600">
-                      Rate: <span className="font-semibold text-slate-800">৳{newRental.subscriptionType === 'daily' ? selectedPlan?.dailyRate : newRental.subscriptionType === 'weekly' ? selectedPlan?.weeklyRate : selectedPlan?.monthlyRate}</span>
+                      <span>Rate: </span>
-                      <span className="text-slate-500">/{newRental.subscriptionType === 'daily' ? 'day' : newRental.subscriptionType === 'weekly' ? 'week' : 'month'}</span>
+                      {(() => {
-                    </p>
+                        const bikeRate = newRental.subscriptionType === 'daily' ? selectedPlan?.dailyRate : newRental.subscriptionType === 'weekly' ? selectedPlan?.weeklyRate : selectedPlan?.monthlyRate;
+                        const batteryRent = newRental.batteryRent || 0;
+                        const batteryRate = batteryRent > 0 ? (newRental.subscriptionType === 'daily' ? Math.round(batteryRent / 30) : newRental.subscriptionType === 'weekly' ? Math.round(batteryRent / 4) : batteryRent) : 0;
+                        const totalRate = bikeRate + batteryRate;
+                        return (
+                          <span className="font-semibold text-slate-800">
+                            ৳{totalRate.toLocaleString()}/{newRental.subscriptionType === 'daily' ? 'day' : newRental.subscriptionType === 'weekly' ? 'week' : 'month'}
+                            {batteryRent > 0 && <span className="text-xs text-amber-600 ml-1">(Bike: ৳{bikeRate} + Battery: ৳{batteryRate})</span>}
+                          </span>
+                        );
+                      })()}
+                    </div>
                   </div>
                 </div>
               )}
@@ -978,7 +1031,7 @@ export default function RentalsPage() {
               {createStep === 3 && (
                 <div className="space-y-4">
                   <h4 className="font-medium text-slate-700 mb-3">Step 3: Select Bike & Battery</h4>
-                  
+
                   <div>
                     <label className="text-sm text-slate-600 mb-1 block">Select Bike</label>
                     <select
@@ -1002,7 +1055,8 @@ export default function RentalsPage() {
                   </div>
 
                   <div>
-                    <label className="text-sm text-slate-600 mb-1 block">Select Battery (Optional)</label>
+                    <label className="text-sm text-slate-600 mb-1 block">Request Battery (Optional)</label>
+                    <p className="text-xs text-slate-500 mb-2">Biker can request for battery. It will be added to their rental.</p>
                     <select
                       value={newRental.batteryId}
                       onChange={(e) => {
@@ -1017,8 +1071,15 @@ export default function RentalsPage() {
                       ))}
                     </select>
                     {newRental.batteryId && (
-                      <div className="mt-2 p-2 bg-amber-50 border border-amber-200 rounded-lg">
+                      <div className="mt-2 p-3 bg-amber-50 border border-amber-200 rounded-lg space-y-1">
                         <p className="text-sm text-amber-700">Battery Monthly Rent: <span className="font-bold">৳{newRental.batteryRent}/month</span></p>
+                        <div className="text-xs text-amber-600 pt-1 border-t border-amber-100">
+                          <p>Calculated Rate by Subscription:</p>
+                          <p>• Daily: ৳{Math.round(newRental.batteryRent / 30)}/day (৳{newRental.batteryRent}/30)</p>
+                          <p>• Weekly: ৳{Math.round(newRental.batteryRent / 4)}/week (৳{newRental.batteryRent}/4)</p>
+                          <p>• Monthly (30 days): ৳{newRental.batteryRent}/month</p>
+                          <p>• Monthly (31 days): ৳{newRental.batteryRent}/month</p>
+                        </div>
                       </div>
                     )}
                   </div>
@@ -1034,15 +1095,40 @@ export default function RentalsPage() {
                     <p className="text-sm text-slate-600">User: {selectedUser?.name}</p>
                     <p className="text-sm text-slate-600">Bike: {selectedBike?.model} ({selectedBike?.plate})</p>
                     {newRental.batteryId && (
-                      <p className="text-sm text-slate-600">Battery: {availableBatteries.find(b => b.id === newRental.batteryId)?.brand} {availableBatteries.find(b => b.id === newRental.batteryId)?.model} (Rent: ৳{newRental.batteryRent}/month)</p>
+                      <p className="text-sm text-slate-600">Battery: {availableBatteries.find(b => b.id === newRental.batteryId)?.brand} {availableBatteries.find(b => b.id === newRental.batteryId)?.model} (Monthly Rent: ৳{newRental.batteryRent})</p>
                     )}
                     <p className="text-sm text-slate-600">Hub: {mockHubs.find(h => h.id === newRental.hubId)?.name}</p>
                     {newRental.batteryId && (
-                      <div className="mt-2 pt-2 border-t border-slate-200">
+                      <div className="mt-3 pt-3 border-t border-slate-200">
-                        <p className="text-sm font-medium text-emerald-700">
+                        <p className="text-sm font-medium text-emerald-700 mb-2">Total Rental Payment (Bike + Battery):</p>
-                          Combined Monthly Rent: ৳{(newRental.subscriptionType === 'daily' ? selectedPlan?.dailyRate : newRental.subscriptionType === 'weekly' ? selectedPlan?.weeklyRate : selectedPlan?.monthlyRate) + newRental.batteryRent}/month
+                        {(() => {
-                          <span className="text-xs text-slate-500 ml-1">(Bike: ৳{newRental.subscriptionType === 'daily' ? selectedPlan?.dailyRate : newRental.subscriptionType === 'weekly' ? selectedPlan?.weeklyRate : selectedPlan?.monthlyRate} + Battery: ৳{newRental.batteryRent})</span>
+                          const bikeRate = newRental.subscriptionType === 'daily' ? selectedPlan?.dailyRate : newRental.subscriptionType === 'weekly' ? selectedPlan?.weeklyRate : selectedPlan?.monthlyRate;
-                        </p>
+                          const batteryMonthlyRent = newRental.batteryRent || 0;
+                          const dailyRate = bikeRate + Math.round(batteryMonthlyRent / 30);
+                          const weeklyRate = bikeRate + Math.round(batteryMonthlyRent / 4);
+                          const monthly30Rate = bikeRate + batteryMonthlyRent;
+                          const monthly31Rate = bikeRate + batteryMonthlyRent;
+                          return (
+                            <div className="space-y-1 text-xs">
+                              <p className="text-slate-600">
+                                <span className="font-medium">Daily:</span> ৳{dailyRate}/day
+                                <span className="text-amber-600"> (Bike: ৳{bikeRate} + Battery: ৳{Math.round(batteryMonthlyRent / 30)})</span>
+                              </p>
+                              <p className="text-slate-600">
+                                <span className="font-medium">Weekly:</span> ৳{weeklyRate}/week
+                                <span className="text-amber-600"> (Bike: ৳{bikeRate} + Battery: ৳{Math.round(batteryMonthlyRent / 4)})</span>
+                              </p>
+                              <p className="text-slate-600">
+                                <span className="font-medium">Monthly (30 days):</span> ৳{monthly30Rate}/month
+                                <span className="text-amber-600"> (Bike: ৳{bikeRate} + Battery: ৳{batteryMonthlyRent})</span>
+                              </p>
+                              <p className="text-slate-600">
+                                <span className="font-medium">Monthly (31 days):</span> ৳{monthly31Rate}/month
+                                <span className="text-amber-600"> (Bike: ৳{bikeRate} + Battery: ৳{batteryMonthlyRent})</span>
+                              </p>
+                            </div>
+                          );
+                        })()}
                       </div>
                     )}
                   </div>