"use client";

import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Trash, PlusCircle } from "lucide-react";

interface PricingTiersProps {
  pricing: any[];
  handleTierChange: (
    e: React.ChangeEvent<HTMLInputElement>,
    index: number
  ) => void;
  handleRemoveTier: (index: number) => void;
  handleAddTier: () => void;
}

export const PricingTiers = ({
  pricing,
  handleTierChange,
  handleRemoveTier, 
  handleAddTier,
}: PricingTiersProps) => {
  const formatNumber = (num: number) => {
    // Only format to 2 decimal places if the number has decimal places
    // This prevents cursor jumping when user types whole numbers
    return num % 1 === 0 ? num.toString() : num.toFixed(2);
  };

  const formatTotal = (num: number) => {
    return num.toFixed(2);
  };

  const calculateTotal = (quantity: number, pricePerUnit: number) => {
    return formatTotal(quantity * pricePerUnit);
  };

  const handleTotalChange = (
    e: React.ChangeEvent<HTMLInputElement>,
    index: number,
    minQuantity: number
  ) => {
    const totalPrice = Number(e.target.value);
    const pricePerUnit = minQuantity > 0 ? totalPrice / minQuantity : 0;
    
    const syntheticEvent = {
      target: {
        name: 'pricePerUnit',
        value: formatNumber(pricePerUnit)
      }
    } as React.ChangeEvent<HTMLInputElement>;
    
    handleTierChange(syntheticEvent, index);
  };

  return (
    <div>
      <h3 className="text-sm font-medium">Tiered Pricing</h3>

      {pricing?.length > 0 ? (
        <>
          <div className="grid grid-cols-[1fr_1fr_1fr_auto] gap-2 mt-2 mb-1">
            <div className="text-xs text-muted-foreground">Quantity</div>
            <div className="text-xs text-muted-foreground">Price Per Unit</div>
            <div className="text-xs text-muted-foreground">Total Price</div>
            <div className="w-8" />
          </div>

          {[...pricing]
            .sort((a, b) => a.minQuantity - b.minQuantity)
            .map((tier, sortedIndex) => {
              // Find the original index for proper event handling
              const originalIndex = pricing.findIndex(p => 
                p === tier || (p.minQuantity === tier.minQuantity && p.pricePerUnit === tier.pricePerUnit)
              );
              return (
            <div
              key={tier._id || originalIndex}
              className="grid grid-cols-[1fr_1fr_1fr_auto] gap-2 mt-2"
            >
              <Input
                name="minQuantity"
                type="number"
                placeholder="Min Quantity"
                value={tier.minQuantity === 0 ? "" : tier.minQuantity}
                onChange={(e) => handleTierChange(e, originalIndex)}
                className="h-8 text-sm px-2"
              />

              <Input
                name="pricePerUnit"
                type="number"
                placeholder="Price per unit"
                value={tier.pricePerUnit === 0 ? "" : formatNumber(tier.pricePerUnit)}
                onChange={(e) => handleTierChange(e, originalIndex)}
                className="h-8 text-sm px-2"
              />

              <Input
                type="number"
                placeholder="Total price"
                value={
                  tier.minQuantity && tier.pricePerUnit
                    ? calculateTotal(tier.minQuantity, tier.pricePerUnit)
                    : ""
                }
                onChange={(e) => handleTotalChange(e, originalIndex, tier.minQuantity)}
                className="h-8 text-sm px-2"
              />

              <Button
                variant="ghost"
                size="icon"
                className="text-red-500 hover:bg-red-100"
                onClick={() => handleRemoveTier(originalIndex)}
              >
                <Trash className="h-5 w-5" />
              </Button>
            </div>
            );
          })}
        </>
      ) : (
        <p className="text-sm text-gray-500 mt-2">No pricing tiers added.</p>
      )}

      <Button variant="outline" size="sm" className="mt-2" onClick={handleAddTier}>
        <PlusCircle className="w-4 h-4 mr-1" />
        Add Tier
      </Button>
    </div>
  );
};