import React from "react";
import { formatNumber } from "~/lib/utils";

interface FunnelData {
  name: string;
  value: number;
  label: string;
  percentage?: string;
}

interface FunnelChartProps {
  data: FunnelData[];
  title?: string;
  className?: string;
}

export function FunnelChart({ data, title, className = "" }: FunnelChartProps) {
  const maxValue = Math.max(...data.map(d => d.value));
  const toPercent = (value: number) => {
    if (!maxValue || maxValue <= 0) return 0;
    return Math.round((value / maxValue) * 100);
  };
  
  return (
    <div className={`w-full ${className}`}>
      {title && (
        <h3 className="text-lg font-semibold text-white mb-4 py-2 text-right border-b-2 border-gray-400/20">
          {title}
        </h3>
      )}
      
      <div className="flex flex-col items-center gap-2 space-y-2">
        {/* Start Process Line */}
        <div className="flex items-center w-full gap-10 mt-6">
        <div className="text-lg text-gray-600 min-w-[max-content]">ابتدا فرآیند</div>
          <div className="flex items-center w-full gap-4">
            <div className="w-full h-0.5 bg-gray-600 relative">
            <div className="text-2xl text-white absolute left-1/2 -translate-x-1/2 top-[-1rem] -translate-y-1/2">۱۰۰%</div>
              <div className="absolute -top-1 left-0 w-1 h-3 bg-gray-600"></div>
              <div className="absolute -top-1 right-0 w-1 h-3 bg-gray-600"></div>
            </div>
          </div>
        </div>

        {/* Funnel Bars */}
        <div className="flex flex-col items-center space-y-1 gap-2 w-full max-w-md">
          {data.map((item, index) => {
            const widthPercentage = toPercent(item.value);
            const barWidth = Math.max(20, widthPercentage); // Minimum 20% width
            
            return (
              <div key={index} className="flex items-center justify-center w-full">
                <div className="flex items-center gap-10 w-full">
                  {/* Right side label (RTL) */}
                  <div className="text-lg text-white font-thin min-w-[max-content] text-center">
                    {item.label}
                  </div>
                  {/* Centered bar with equal side spacers so that numbers align on a vertical axis */}
                  <div className="flex items-center w-full">
                    {/* Left spacer */}
                    <div style={{ width: `${(100 - barWidth) / 2}%` }} />
                    {/* Bar */}
                    <div
                      className="bg-[#3BC47A] h-8 rounded-2xl flex items-center justify-center text-lg relative"
                      style={{ width: `${barWidth}%` }}
                    >
                      <span className="text-gray-900 text-[#3F415A] font-semibold">
                        {item.value.toLocaleString('fa-IR')}
                      </span>
                    </div>
                    {/* Right spacer */}
                    <div style={{ width: `${(100 - barWidth) / 2}%` }} />
                  </div>
                </div>
              </div>
            );
          })}
        </div>

        {/* End Process Line */}
        <div className="flex items-center w-full gap-10 mt-6">
        <div className="text-lg text-gray-600 min-w-[max-content]">انتها فرآیند</div>
          <div className="flex items-center w-full gap-4">
            {(() => {
              const lastValue = data[data.length - 1]?.value ?? 0;
              const percent = toPercent(lastValue);
              return (
                <div style={{ width: `${percent}%` }} className={`mx-auto h-0.5 bg-gray-600 relative ${percent === 0 ? "hidden" : ""}`}>
                  <div className="text-2xl text-white absolute left-1/2 -translate-x-1/2 bottom-[-2.5rem] -translate-y-1">{formatNumber(percent)}%</div>
                  <div className="absolute -top-1 left-0 w-1 h-3 bg-gray-600"></div>
                  <div className="absolute -top-1 right-0 w-1 h-3 bg-gray-600"></div>
                </div>
              );
            })()}
          </div>
        </div>
      </div>
    </div>
  );
}