import React, { useState, useEffect } from 'react';

const Step = ({ number, title, isActive, isValid, isCompleted, onClick }) => {
  return (
    <div className="flex-shrink-0 flex justify-center relative mx-4">
      <div
        className={`
                w-8 h-8 rounded-full
                flex items-center justify-center
                text-sm font-semibold
                ${
                  isCompleted
                    ? 'bg-emerald-600 text-white'
                    : isActive
                      ? 'bg-emerald-600 text-white'
                      : 'bg-gray-200 text-gray-600'
                }
            `}
      >
        {isCompleted ? (
          <svg
            xmlns="http://www.w3.org/2000/svg"
            className="h-5 w-5"
            viewBox="0 0 20 20"
            fill="currentColor"
          >
            <path
              fillRule="evenodd"
              d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z"
              clipRule="evenodd"
            />
          </svg>
        ) : (
          number
        )}
      </div>
      <div className="absolute top-12 left-1/2 -translate-x-1/2">
        <span
          className={`
                    text-xs font-medium w-20 text-center block break-words
                    ${isActive ? 'text-emerald-600' : 'text-gray-500'}
                `}
        >
          {title}
        </span>
      </div>
    </div>
  );
};

const SpacerStep = ({ isCompleted }) => {
  return (
    <div
      className={`flex-1 h-0.5 ${isCompleted ? 'bg-emerald-600' : 'bg-gray-200'}`}
    />
  );
};

const Dots = () => {
  return (
    <div className="text-gray-500 relative flex items-center mx-4">
      <span>...</span>
      <div className="absolute top-8 left-1/2 -translate-x-1/2">
        <span className="text-xs font-medium w-20 text-center block">...</span>
      </div>
    </div>
  );
};

const ProgressStep = ({
  steps,
  stepTitles,
  currentStep,
  setStep,
  isStepValid,
}) => {
  const [windowWidth, setWindowWidth] = useState(window.innerWidth);
  const [visibleSteps, setVisibleSteps] = useState(steps);

  useEffect(() => {
    const handleResize = () => setWindowWidth(window.innerWidth);
    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);

  useEffect(() => {
    const calculateVisibleSteps = () => {
      const minWidth = 150; // Largeur minimale estimée par étape
      const maxVisibleSteps = Math.floor(windowWidth / minWidth);

      if (maxVisibleSteps >= steps.length) {
        setVisibleSteps(steps);
        return;
      }

      if (maxVisibleSteps < 4) {
        // Garder seulement première, dernière et courante
        let filtered = [steps[0]];
        if (currentStep > 1 && currentStep < steps.length) {
          filtered.push('...');
          filtered.push(steps[currentStep - 1]);
        }
        if (currentStep < steps.length) {
          filtered.push('...');
        }
        filtered.push(steps[steps.length - 1]);
        setVisibleSteps(filtered);
      } else {
        // Garder première, dernière, courante et quelques étapes adjacentes
        let filtered = [steps[0]];
        if (currentStep > 2) filtered.push('...');
        if (currentStep > 1 && currentStep < steps.length) {
          filtered.push(steps[currentStep - 1]);
        }
        if (currentStep < steps.length - 1) filtered.push('...');
        filtered.push(steps[steps.length - 1]);
        setVisibleSteps(filtered);
      }
    };

    calculateVisibleSteps();
  }, [windowWidth, currentStep, steps]);

  const handleStepClick = (stepIndex) => {
    // Vérifie si on peut naviguer vers l'étape (toutes les étapes précédentes doivent être valides)
    const canNavigate = Array.from(
      { length: stepIndex },
      (_, i) => i + 1
    ).every((step) => isStepValid(step));

    if (canNavigate) {
      setStep(stepIndex + 1);
    }
  };

  return (
    <div className="w-full py-6">
      <div className="flex items-center min-h-[100px]">
        {visibleSteps.map((step, index) => {
          if (step === '...') {
            return (
              <div
                key={`dots-${index}`}
                className="flex-1 flex items-center justify-center"
              >
                <Dots />
                {index !== visibleSteps.length - 1 && (
                  <SpacerStep isCompleted={false} />
                )}
              </div>
            );
          }

          const originalIndex = steps.indexOf(step);
          return (
            <div
              key={index}
              className={`
                                flex-1 relative
                                ${Array.from({ length: originalIndex + 1 }, (_, i) => i + 1).every((s) => isStepValid(s)) ? 'cursor-pointer' : 'cursor-not-allowed'}
                            `}
              onClick={() => handleStepClick(originalIndex)}
            >
              <div className="flex items-center">
                <div className="w-full flex items-center">
                  <Step
                    number={originalIndex + 1}
                    title={stepTitles ? stepTitles[originalIndex + 1] : step}
                    isActive={currentStep === originalIndex + 1}
                    isCompleted={currentStep > originalIndex + 1}
                    isValid={isStepValid(originalIndex + 1)}
                  />
                  {index !== visibleSteps.length - 1 && (
                    <SpacerStep isCompleted={currentStep > originalIndex + 1} />
                  )}
                </div>
              </div>
            </div>
          );
        })}
      </div>
    </div>
  );
};

export default ProgressStep;