'use client';

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

interface JoinRideModalProps {
  isOpen: boolean;
  onClose: () => void;
  onJoinSuccess: (code: string) => Promise<{ title: string; lead: string; status: 'joined' | 'requested' }>;
}

export function JoinRideModal({ isOpen, onClose, onJoinSuccess }: JoinRideModalProps) {
  const [code, setCode] = useState('');
  const [errorMsg, setErrorMsg] = useState<string | null>(null);
  const [successInfo, setSuccessInfo] = useState<{ title: string; lead: string; status: 'joined' | 'requested' } | null>(null);
  const [isSubmitting, setIsSubmitting] = useState(false);

  // Reset state when modal is opened/closed
  useEffect(() => {
    if (isOpen) {
      setCode('');
      setErrorMsg(null);
      setSuccessInfo(null);
      setIsSubmitting(false);
    }
  }, [isOpen]);

  // Handle ESC key press
  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape' && isOpen) {
        onClose();
      }
    };
    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, [isOpen, onClose]);

  if (!isOpen) return null;

  const handleCodeChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const raw = e.target.value.toUpperCase().replace(/[^A-Z0-9_-]/g, '');
    setCode(raw);
    if (errorMsg) setErrorMsg(null);
  };

  const processCode = async (rideCode: string) => {
    const cleanCode = rideCode.trim().toUpperCase();
    if (!cleanCode || cleanCode.length < 4) {
      setErrorMsg('Please enter a valid ride code (at least 4 characters).');
      return;
    }

    setIsSubmitting(true);
    setErrorMsg(null);
    try {
      setSuccessInfo(await onJoinSuccess(cleanCode));
    } catch (error) {
      setErrorMsg(error instanceof Error ? error.message : 'Could not join this ride.');
    } finally {
      setIsSubmitting(false);
    }
  };

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    void processCode(code);
  };

  return (
    <div
      role="dialog"
      aria-modal="true"
      aria-labelledby="join-pack-title"
      className="fixed inset-0 z-50 flex items-center justify-center p-space-md bg-surface-container-lowest/80 backdrop-blur-md"
      onClick={(e) => {
        if (e.target === e.currentTarget) onClose();
      }}
    >
      <div className="bg-surface-container-low max-w-md w-full rounded-2xl p-space-xl shadow-2xl relative border border-outline-variant/30 flex flex-col">
        {/* Header */}
        <div className="flex items-center justify-between mb-space-md">
          <div className="flex items-center gap-space-xs">
            <span className="material-symbols-outlined text-primary-container text-[24px]">
              qr_code_scanner
            </span>
            <h3 id="join-pack-title" className="font-headline-md text-headline-md text-on-surface">
              Join Pack Formation
            </h3>
          </div>
          <button
            onClick={onClose}
            className="text-on-surface-variant hover:text-on-surface p-1 rounded-lg hover:bg-surface-container transition-colors"
            aria-label="Close modal"
          >
            <span className="material-symbols-outlined text-[20px]">close</span>
          </button>
        </div>

        {/* Success State */}
        {successInfo ? (
          <div className="flex flex-col items-center text-center py-4">
            <div className="w-14 h-14 rounded-full bg-secondary-fixed/20 text-secondary-fixed flex items-center justify-center mb-3">
              <span className="material-symbols-outlined text-[32px]">check_circle</span>
            </div>
            <span className="font-label-caps text-label-caps text-secondary-fixed mb-1">
              {successInfo.status === 'joined' ? 'Ride Joined' : 'Request Sent'}
            </span>
            <h4 className="font-headline-md text-headline-md text-on-surface mb-1">
              {successInfo.title}
            </h4>
            <p className="font-body-sm text-body-sm text-on-surface-variant mb-6">
              Ride lead: <span className="text-on-surface font-bold">{successInfo.lead}</span>.
              {successInfo.status === 'joined' ? ' You are on the rider list.' : ' The organizer must approve your request.'}
            </p>
            <button
              onClick={onClose}
              className="w-full py-3 rounded-xl bg-primary-container text-on-primary-container font-headline-sm text-headline-sm hover:shadow-lg transition-all"
            >
              Done
            </button>
          </div>
        ) : (
          /* Input / Scanner Flow */
          <form onSubmit={handleSubmit} className="flex flex-col">
            <p className="font-body-sm text-body-sm text-on-surface-variant mb-space-md">
              Enter the ride code to find a public group ride and join or request a slot.
            </p>

            {/* Error Message */}
            {errorMsg && (
              <div className="mb-space-md p-space-sm rounded-lg bg-error-container text-on-error-container font-code-mono text-code-mono flex items-center gap-2">
                <span className="material-symbols-outlined text-[18px]">error</span>
                <span>{errorMsg}</span>
              </div>
            )}

            {/* Code Input */}
            <div className="flex flex-col gap-space-md mb-space-lg">
              <div className="relative">
                <input
                  aria-label="Ride Code"
                  type="text"
                  maxLength={10}
                  value={code}
                  onChange={handleCodeChange}
                  placeholder="e.g. APEX84"
                  className="w-full bg-surface-container-lowest font-code-mono text-headline-md text-center tracking-widest text-primary px-space-md py-3 rounded-xl outline-none border border-outline-variant/30 focus:border-primary-container focus:ring-1 focus:ring-primary-container placeholder:text-on-surface-variant/40"
                  autoFocus
                />
              </div>

            </div>

            {/* Submit Button */}
            <button
              type="submit"
              disabled={isSubmitting}
              className="w-full py-3.5 rounded-xl bg-gradient-to-r from-primary-container to-primary-fixed text-on-primary-container font-headline-sm text-headline-sm hover:shadow-[0_0_20px_rgba(0,242,254,0.3)] transition-all flex items-center justify-center gap-2 disabled:opacity-50"
            >
              {isSubmitting ? (
                <>
                  <span className="material-symbols-outlined text-[20px] animate-spin">refresh</span>
                  Linking Telemetry...
                </>
              ) : (
                <>
                  <span className="material-symbols-outlined text-[20px]">sync_alt</span>
                  Connect Squad Telemetry
                </>
              )}
            </button>
          </form>
        )}
      </div>
    </div>
  );
}