/**
 * SchoolSearchModal Component
 * Modal for searching and adding schools to comparison
 */

'use client';

import { useState, useMemo } from 'react';
import { Modal } from './Modal';
import { useComparison } from '@/hooks/useComparison';
import { debounce } from '@/lib/utils';
import type { School } from '@/lib/types';
import styles from './SchoolSearchModal.module.css';

interface SchoolSearchModalProps {
  isOpen: boolean;
  onClose: () => void;
}

export function SchoolSearchModal({ isOpen, onClose }: SchoolSearchModalProps) {
  const { addSchool, selectedSchools, canAddMore } = useComparison();
  const [searchTerm, setSearchTerm] = useState('');
  const [results, setResults] = useState<School[]>([]);
  const [isSearching, setIsSearching] = useState(false);
  const [hasSearched, setHasSearched] = useState(false);

  // Debounced search function
  const performSearch = useMemo(
    () =>
      debounce(async (term: string) => {
        if (!term.trim()) {
          setResults([]);
          setHasSearched(false);
          return;
        }

        setIsSearching(true);
        try {
          const response = await fetch(`/api/schools?search=${encodeURIComponent(term)}&page_size=10`);
          const data = await response.json();
          setResults(data.schools || []);
          setHasSearched(true);
        } catch (error) {
          console.error('Search failed:', error);
          setResults([]);
        } finally {
          setIsSearching(false);
        }
      }, 300),
    []
  );

  const handleSearchChange = (value: string) => {
    setSearchTerm(value);
    performSearch(value);
  };

  const handleAddSchool = (school: School) => {
    addSchool(school);
    // Don't close modal, allow adding multiple schools
  };

  const isSchoolSelected = (urn: number) => {
    return selectedSchools.some((s) => s.urn === urn);
  };

  const handleClose = () => {
    setSearchTerm('');
    setResults([]);
    setHasSearched(false);
    onClose();
  };

  return (
    <Modal isOpen={isOpen} onClose={handleClose}>
      <div className={styles.modalContent}>
        <h2 className={styles.title}>Add School to Comparison</h2>

        {!canAddMore && (
          <div className={styles.warning}>
            Maximum 5 schools can be compared. Remove a school to add another.
          </div>
        )}

        {/* Search Input */}
        <div className={styles.searchContainer}>
          <input
            type="text"
            value={searchTerm}
            onChange={(e) => handleSearchChange(e.target.value)}
            placeholder="Search by school name or location..."
            className={styles.searchInput}
            autoFocus
          />
          {isSearching && <div className={styles.searchSpinner} />}
        </div>

        {/* Results */}
        <div className={styles.results}>
          {hasSearched && results.length === 0 && (
            <div className={styles.noResults}>
              No schools found matching "{searchTerm}"
            </div>
          )}

          {results.map((school) => {
            const alreadySelected = isSchoolSelected(school.urn);

            return (
              <div key={school.urn} className={styles.resultItem}>
                <div className={styles.schoolInfo}>
                  <div className={styles.schoolName}>{school.school_name}</div>
                  <div className={styles.schoolMeta}>
                    {school.local_authority && (
                      <span>{school.local_authority}</span>
                    )}
                    {school.school_type && (
                      <span>{school.school_type}</span>
                    )}
                  </div>
                </div>
                <button
                  onClick={() => handleAddSchool(school)}
                  disabled={alreadySelected || !canAddMore}
                  className={styles.addButton}
                >
                  {alreadySelected ? '✓ Added' : '+ Add'}
                </button>
              </div>
            );
          })}
        </div>

        {!hasSearched && (
          <div className={styles.hint}>
            Start typing to search for schools...
          </div>
        )}
      </div>
    </Modal>
  );
}