import React from 'react';
import { ArrowDown, ArrowRight, ArrowUp } from 'lucide-react';

const CircularRNAPipeline = ({
  title = "Bioinformatics Pipeline",
  leftSteps = [
    "Raw Sequencing Data (fastq files)",
    "Quality Control and Preprocessing of Data", 
    "High Quality Sequencing Data (fastq file)",
    "Alignment to Reference Genome"
  ],
  rightSteps = [
    "Downstream Advanced Analysis",
    "Circular RNA Identification",
    "Circular RNA Prediction", 
    "Back Splicing Junction Reads"
  ],
  backgroundColor = "bg-gray-50",
  cardColor = "bg-gray-300",
  textColor = "text-teal-600",
  arrowColor = "text-gray-600",
  className = "",
  cardClassName = "",
  titleClassName = ""
}) => {
  // Combine steps for mobile layout
  const mobileSteps = [...leftSteps, ...rightSteps.slice().reverse()];

  return (
    <section className={`py-6 sm:py-8 lg:py-12 ${backgroundColor} ${className}`}>
      <div className="container mx-auto max-w-none px-3 sm:px-4 lg:px-6">
        <h2 className={`text-gray-700 text-left pb-4 sm:pb-6 text-xl sm:text-2xl lg:text-3xl font-normal ${titleClassName}`}>
          {title}
        </h2>

        {/* Pipeline Flowchart */}
        <div className="bg-white rounded-xl shadow-lg p-4 sm:p-6 lg:p-8">
          <div className="flex justify-center">
            <div className="w-full max-w-5xl">
              <div className="relative">
                {/* Mobile Layout - Single Column */}
                <div className="block sm:hidden">
                  <div className="flex flex-col items-center space-y-3">
                    {mobileSteps.map((step, index) => (
                      <React.Fragment key={index}>
                        <div className={`${cardColor} rounded-lg p-3 w-full text-center border ${cardClassName}`}>
                          <h3 className={`text-xs font-medium ${textColor}`}>{step}</h3>
                        </div>
                        {index < mobileSteps.length - 1 && (
                          <ArrowDown className={`w-5 h-5 ${arrowColor}`} />
                        )}
                      </React.Fragment>
                    ))}
                  </div>
                </div>

                {/* Tablet and Desktop Layout - Two Columns */}
                <div className="hidden sm:block">
                  <div className="grid grid-cols-2 gap-4 sm:gap-6 lg:gap-8">
                    {/* Left Column */}
                    <div className="flex flex-col items-center space-y-2 sm:space-y-3">
                      {leftSteps.map((step, index) => (
                        <React.Fragment key={index}>
                          <div className={`${cardColor} rounded-lg p-3 sm:p-4 w-full max-w-80 text-center border ${cardClassName}`}>
                            <h3 className={`text-xs sm:text-sm font-medium ${textColor}`}>{step}</h3>
                          </div>
                          {index < leftSteps.length - 1 && (
                            <ArrowDown className={`w-5 h-5 sm:w-6 sm:h-6 ${arrowColor}`} />
                          )}
                        </React.Fragment>
                      ))}
                    </div>

                    {/* Right Column */}
                    <div className="flex flex-col items-center space-y-2 sm:space-y-3">
                      {rightSteps.map((step, index) => (
                        <React.Fragment key={index}>
                          <div className={`${cardColor} rounded-lg p-3 sm:p-4 w-full max-w-80 text-center border ${cardClassName}`}>
                            <h3 className={`text-xs sm:text-sm font-medium ${textColor}`}>{step}</h3>
                          </div>
                          {index < rightSteps.length - 1 && (
                            <ArrowUp className={`w-5 h-5 sm:w-6 sm:h-6 ${arrowColor}`} />
                          )}
                        </React.Fragment>
                      ))}
                    </div>
                  </div>

                  {/* Custom arrows from "Alignment to Reference Genome" */}
                  <div className="absolute bottom-12 sm:bottom-16 lg:bottom-[2rem] left-1/2 transform -translate-x-1/2">
                    <div className="relative w-0 h-0">
                      
                      {/* Arrow 1: Straight horizontal to "Back Splicing Junction Reads" (Unmapped Reads) */}
                      <div className="absolute top-0 left-0">
                        <div className="relative">
                          {/* Horizontal line */}
                          <div className="w-16 sm:w-20 lg:w-28 h-0.5 bg-gray-600"></div>
                          {/* Arrowhead */}
                          <div className="absolute right-0 -top-1 w-2 h-2 border-r-2 border-t-2 border-gray-600 rotate-45"></div>
                          {/* Label */}
                          <div className="absolute top-2 left-4 sm:left-6 lg:left-10 text-xs text-gray-700 font-medium whitespace-nowrap">
                            Unmapped Reads
                          </div>
                        </div>
                      </div>

                      {/* Arrow 2: Diagonal upward to "Circular RNA Prediction" (Mapped Reads) */}
                      <div className="absolute top-0 left-0">
                        <div className="relative">
                          {/* Diagonal line going up and right */}
                          <div className="absolute origin-left w-20 sm:w-24 lg:w-32 h-0.5 bg-gray-600 transform -rotate-45"></div>
                          {/* Arrowhead positioned at the end of diagonal line */}
                          <div className="absolute w-2 h-2 border-r-2 border-t-2 border-gray-600 transform rotate-0"
                               style={{
                                 left: 'calc(20 * 0.25rem * 0.707 - 4px)', // cos(45deg) ≈ 0.707
                                 top: 'calc(-20 * 0.25rem * 0.707 - 4px)'   // -sin(45deg) ≈ -0.707
                               }}></div>
                          {/* Label */}
                          <div className="absolute -top-8 left-6 sm:left-8 lg:left-12 text-xs text-gray-700 font-medium whitespace-nowrap">
                            Mapped Reads
                          </div>
                        </div>
                      </div>

                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </section>
  );
};

export default CircularRNAPipeline;